how to measure protein content

how to measure protein content, Total:286 items.

The international standard classification for "how to measure protein content" includes: Man-made fibres , Fruits. Vegetables , General methods of tests and analysis for food products , Meat and meat products , Vegetables and derived products , food products in general , Cereals, pulses and derived products , Textiles in general , Tobacco, tobacco products and related equipment .

The Chinese standard classification for "how to measure protein content" includes: Cereal crop and forage crop in general , Chemical fibre in general , Other cash crops , Basic standard and general method on forestry , Meat processing and products , Vegetable processing and products , Food processing and products in general , Silk and silk fabric in general , Tobacco .

Professional Standard - Agriculture

218药典四部-2015 3100 Content Determination 3124 Recombinant Human Granulocyte Stimulating Factor Protein Content Determination
NY/T 2007-2011 Determination of the crude protein content in cereals and pules seeds by combustion according to the dumas principle
245药典三部-2020 Content Determination Method 3124 Human Granulocyte Stimulating Factor Protein Content Determination Method
226药典三部-2015 Content Assay 3124 Recombinant Human Granulocyte Stimulating Factor Protein Assay General Rules 62
92药典四部-2020 0700 Other Determination Methods 0731 Determination of Protein Content
242药典三部-2020 Content Determination Method 3121 Determination of Human Albumin Polymer
206药典四部-2020 3100 Content Determination 3124 Recombinant Human Granulocyte Stimulating Factor Protein Content Determination
651药典第一增补本-2010 Part Two Revised Appendix Appendix VII M Determination of Protein Content
111药典四部-2015 0700 Other Determination Methods 0731 Determination of Protein Content
NY/T 1205-2006 Method for determination of water solubale protein in soybean
220药典三部-2020 Content Determination Method 0731 Protein Content Determination Method
201药典三部-2015 Content Determination Method 0731 General Principles of Protein Content Determination Method 50
2330药典二部-2010 Appendix VII M Determination of protein content
215药典四部-2015 3100 Content Determination 3121 Determination of Human Albumin Polymer

Professional Standard - Textile

FZ/T 50018-2013 Determination of the protein content of the protein viscose fiber

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

GB/T 24899-2010 Inspection of grain and oils—Determination of crude protein in wheat—Near-infrared method
BJS 201915 Determination of casein content in milk-containing beverages and their milk raw materials
GB/T 44214-2024 Test method for non-protein content in silk
GB/T 5511-2008 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method
GB/T 46117-2025 Inspection of grain and oils—Determination of water-soluble protein in soya bean
GB/T 15673-2009 Determination of crude protein in edible mushroom
GB/T 24901-2010 Inspection of grain and oils—Determination of crude protein in maize—Near-infrared method
GB/T 15673-1995 Method for determination of crude protein in edible fungi
GB/T 41366-2022 Livestock and poultry meat quality testing—Determination of moisture,protein and fat—Near-infrared spectroscopy method
GB/T 24871-2010 Inspection of grain and oils—Crude protein determination in wheat flour—Near-infrared method
GB/T 24897-2010 Inspection of grain and oils—Crude protein determination in rice—Near-infrared method
GB/T 35809-2018 Method for analysis of forestry biomass—Determination of protein content

Professional Standard - Tobacco

YC/T 166-2003 Tobacco and tobacco products - Determination of total proteins content(Albumins)

Professional Standard - Commodity Inspection

SN/T 3926-2014 Determination of protein content in dairy foods,egg foods and soy foods for export - Coomassie brilliant blue method

Taiwan Provincial Standard of the People's Republic of China

CNS 6511-2008 Method of test for meat and meat products - Determination of crude protein content

Tianjin Provincial Standard of the People's Republic of China

DB12/T 347-2007 Near-infrared rapid detection method of crude protein content in wheat and corn

Czech Standards Institute (UNMZ)

CSN 57 0111-5-2002 Testing methods for casein and caseinates - Determination of protein content
CSN 570111-5-2002 Testing methods for casein and caseinates - Determination of protein content
CSN 46 7092-27-1998 Testing methods for feeding stuffs - Part 27: Determination of the protein content
CSN 57 0105 Cast.5-1984 Powdered and condensed milk products. Testing methods. Determination of protein content
CSN 46 1011 Cast.18-1988 Testing of cereals, legumes and oil-bea-ring crops. Cereal testing. Crude protein determination.
CSN 57 0111 Cast.4-1979 Testing methods for asein. Determination f fat content
CSN 57 0153-1986 Testing methods for meat products and sterilized food in preserves. Determination of protein content according to Kjeldahl

National Standardisation Body (ASRO)

STAS 2213/17-1976 SWEETS Determination of total proteinic content and milk proteinic substance content
STAS 21/6-1973 OILSEED RESIDUES Determination of protein of protein brut content
STAS 6356-1976 MILK AND MILK PRODUCTS Proteic substances determinat ion
STAS 6514-1975 FISH AND FISH PRODUCTS Determination of total proteic matters
STAS SR 4895-6-1997 Tobacco and tobacco prodocts Determination of total proteins content (albumines)
STAS 9597/3-1974 COMBINED FORAGES Determination of rough protein content
SR ISO 5549:1996 Caseins and caseinates - Determination of protein content (Reference method)

Bureau of Indian Standards

IS 18836-2024 Milk and Milk Products - Determination of Nitrogen Content - Determination of Protein and Non-Protein Nitrogen Content and True Protein Content Calculation (Reference Method)
IS 11888-2005 Casiens And Caseinated - Determination Of Contents Of Scorched Particles And Of Extraneous Matter
IS 11963-2005 Caeins and Caseinates - Determination of Lactose Content - Photometric Method
IS 11920-2012 Cassein and Caseinates -Determination of Moisture Content (Reference Method)
IS 11888-1987 Method for determination of charred particle content in casein and caseinates
IS 7487-1986 Specifications for protein-rich cookies
IS 11963-1987 Photometric method for determination of lactose content in casein and caseinate

International Organization for Standardization (ISO)

ISO 5549:1978 Caseins and caseinates; Determination of protein content (Reference method)
ISO 8968-4:2016 | IDF 20-4:2016 Milk and milk products — Determination of nitrogen content — Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)
ISO 8968-4:2016 Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)
ISO 20483:2006 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method
ISO 5739:2003 Caseins and caseinates - Determination of contents of scorched particles and of extraneous matter
ISO 5739:2003|IDF 107:2003 Determination of casein and caseinate coke particles and foreign matter content
ISO 8968-5:2001 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content
ISO 8968-5:2001|IDF 20-5:2001 Determination of milk nitrogen content Part 5: Determination of protein nitrogen content
ISO 8968-5:2001 | IDF 20-5:2001 Milk — Determination of nitrogen content — Part 5: Determination of protein-nitrogen content
ISO 8968-4:2001 Milk - Determination of nitrogen content - Part 4: Determination of non-protein-nitrogen content
ISO 8968-4:2001|IDF 20-4:2001 Determination of milk nitrogen content Part 4: Determination of non-protein nitrogen content
ISO 5983:1979 Animal feeding stuffs; Determination of nitrogen content and calculation of crude protein content
ISO 5550:2006 Caseins and caseinates - Determination of moisture content (Reference method)
ISO 5739:1983 Caseins and caseinates; Determination of scorched particles content
ISO 5550:2006|IDF 78:2006 Caseins and caseinates — Determination of moisture content (Reference method)
ISO 5548:2004 | IDF 106:2004 Caseins and caseinates — Determination of lactose content — Photometric method
ISO 5548:2004|IDF 106:2004 Caseins and caseinates — Determination of lactose content — Photometric method
ISO 5548:2004 Caseins and caseinates - Determination of lactose content - Photometric method
ISO 5550:1978 Caseins and caseinates; Determination of water content (Reference method)
ISO 5550:2006 | IDF 78:2006 Caseins and caseinates — Determination of moisture content (Reference method)
ISO 5548:1980 Caseins and caseinates; Determination of lactose content; Photometric method
ISO 5543:2004 | IDF 127:2004 Caseins and caseinates — Determination of fat content — Gravimetric method (Reference method)
ISO 5542:1984 Milk; Determination of protein content; Amido black dye-binding method (Routine method)
ISO 20483:2013 Cereals and pulses.Determination of the nitrogen content and calculation of the crude protein content.Kjeldahl method
ISO 5739:2003 | IDF 107:2003 Caseins and caseinates — Determination of contents of scorched particles and of extraneous matter
ISO 5543:2004 Caseins and caseinates - Determination of fat content - Gravimetric method (Reference method)
ISO 5543:2004|IDF 127:2004 Gravimetric method for determination of fat content in casein and caseinate (reference method)
ISO 5543:1986 Caseins and caseinates; Determination of fat content; Gravimetric method (Reference method)
ISO 21415-2:2006 Wheat and wheat flour - Gluten content - Part 2: Determination of wet gluten by mechanical means
ISO 8968-4:2001/Cor 1:2011 Milk - Determination of nitrogen content - Part 4: Determination of non-protein-nitrogen content; Technical Corrigendum 1
ISO 21415-1:2006 Wheat and wheat flour - Gluten content - Part 1: Determination of wet gluten by a manual method
ISO 8968-4:2001 | IDF 20-4:2001 Milk — Determination of nitrogen content — Part 4: Determination of non-protein-nitrogen content
ISO 23319:2022 | IDF 250 Cheese and processed cheese products, caseins and caseinates — Determination of fat content — Gravimetric method

British Standards Institution (BSI)

BS EN ISO 8968-4:2016 Milk and milk products. Determination of nitrogen content. Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)
BS EN ISO 8968-4:2016(2017) Milk and milk products — Determination of nitrogen content Part 4 : Determination of protein and non - protein nitrogen content and true protein content calculation (Reference method)
BS EN ISO 8968-5:2002 Milk. Determination of nitrogen content. Determination of protein-nitrogen content
BS EN ISO 8968-4:2002 Milk. Determination of nitrogen content. Determination of non-protein nitrogen content
BS ISO 5739:2003 Caseins and caseinates - Determination of contents of scorched particles and of extraneous matter
BS ISO 5550:2006 Caseins and caseinates - Determination of moisture content (Reference method)
BS ISO 5548:2004 Caseins and caseinates - Determination of lactose content - Photometric methods
BS EN ISO 21415-4:2007 Wheat and wheat flour - Gluten content - Determination of dry gluten from wet gluten by a rapid drying method
BS EN ISO 21415-3:2007 Wheat and wheat flour - Gluten content - Determination of dry gluten from wet gluten by an oven drying method
BS EN ISO 20483:2006 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method
BS ISO 5543:2004 Caseins and caseinates - Determination of fat content - Gravimetric method (reference method)
BS EN ISO 21415-1:2007 Wheat and wheat flour - Gluten content - Determination of wet gluten by a manual method
BS EN ISO 20483:2013 Cereals and pulses. Determination of the nitrogen content and calculation of the crude protein content. Kjeldahl method
BS 6248-11:1987 Caseins and caseinates. Method for determination of nitrate and nitrite contents
BS ISO 17997-2:2004 Milk. Determination of casein-nitrogen content - Direct method

Korean Agency for Technology and Standards (KATS)

KS H ISO 5549:2021 Caseins and caseinates — Determination of protein content(Reference method)
KS H ISO 5549:2006 Caseins and caseinates－Determination of protein content(Reference method)
KS H ISO 5549-2021 Caseins and caseinates — Determination of protein content(Reference method)
KS H ISO 5549-2006(2016) Caseins and caseinates－Determination of protein content(Reference method)
KS H 1204-2021 Testing method for crude proteins content
KS H 1204-2012 Testing method for crude proteins content
KS H 1204-2001 Testing method for crude proteins content
KS H 1204-2022 Testing method for crude proteins content
KS H ISO 5739:2006 Caseins and caseinates－Determination of scorched particles content
KS H ISO 5739-2006(2016) Caseins and caseinates－Determination of scorched particles content
KS H ISO 5739:2021 Caseins and caseinates — Determination of scorched particles content
KS H ISO 5739-2021 Caseins and caseinates — Determination of scorched particles content
KS H ISO 5550:2007 Caseins and caseinates－Determination of moisture content(Reference method)
KS H ISO 5550-2007(2012) Caseins and caseinates－Determination of moisture content(Reference method)
KS H ISO 5548:2020 Caseins and caseinates－Determination of lactose content－Photometric method
KS H ISO 5548:2006 Caseins and caseinates－Determination of lactose content－Photometric method
KS H ISO 5550-2021 Caseins and caseinates－Determination of moisture content(Reference method)
KS H ISO 5548-2020 Caseins and caseinates－Determination of lactose content－Photometric method
KS H ISO 5543-2006(2016) Caseins and caseinates－Determination of fat content－Gravimetric method(Reference method)
KS H ISO 5543:2021 Caseins and caseinates — Determination of fat content — Gravimetric method(Reference method)
KS H ISO 5542:2006 Milk－Determination of protein content－Amido black dye-binding method(Rountine method)
KS H ISO 5543-2021 Caseins and caseinates — Determination of fat content — Gravimetric method(Reference method)
KS H ISO 5543:2006 Caseins and caseinates－Determination of fat content－Gravimetric method(Reference method)
KS H ISO 5542:2021 Milk — Determination of protein content — Amido black dye-binding method(Rountine method)
KS H ISO 5542-2006(2016) Milk－Determination of protein content－Amido black dye-binding method(Rountine method)
KS H ISO 5542-2021 Milk — Determination of protein content — Amido black dye-binding method(Rountine method)

Kingdom of Bahrain Testing and Metrology Directorate

BH GSO ISO 8968-4:2022 Milk and milk products — Determination of nitrogen content — Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)
BH GSO ISO 5543:2016 Caseins and caseinates -- Determination of fat content -- Gravimetric method (Reference method)
BH GSO ISO 5739:2016 Caseins and caseinates -- Determination of contents of scorched particles and of extraneous matter
BH GSO ISO 23319:2023 Cheese and processed cheese products, caseins and caseinates — Determination of fat content — Gravimetric method

GCC Standardization Organization

GSO ISO 8968-4:2021 Milk and milk products — Determination of nitrogen content — Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)
GSO ISO 8968-5:2014 Milk -- Determination of nitrogen content -- Part 5: Determination of protein-nitrogen content
GSO 2101:2010 Protein-Rich concentrated Nutrient Supplementary foods
GSO ISO 5550:2015 Caseins and caseinates -- Determination of moisture content (Reference method)
GSO ISO 5548:2015 Caseins and caseinates -- Determination of lactose content -- Photometric method
GSO ISO 5543:2015 Caseins and caseinates -- Determination of fat content -- Gravimetric method (Reference method)
GSO ISO 5739:2015 Caseins and caseinates -- Determination of contents of scorched particles and of extraneous matter
GSO ISO 23319:2023 Cheese and processed cheese products, caseins and caseinates — Determination of fat content — Gravimetric method

Ente Nazionale Italiano di Unificazione

UNI EN ISO 8968-4:2016 Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)
UNI EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Determination of protein- nitrogen content
UNI EN ISO 8968-4:2002 Milk - Determination of nitrogen content - Determination of non-protein nitrogen content
UNI 10689:1997 Durum wheat cariopsis. Mechanical determination of the dry gluten content.
UNI ISO 5543:2018 Caseins and caseinates -- Determination of fat content -- Gravimetric method (Reference method)
UNI EN ISO 23319:2022 Cheese and processed cheese products, caseins and caseinates - Determination of fat content - Gravimetric method

German Institute for Standardization

DIN 10454:1983-03 Determination of protein content of caseins and caseinates; reference method
DIN 10464:1994 Determination of casein content, casein and whey protein contents in total protein of milk and milk products - Casein-phosphorus method
DIN EN ISO 8968-4:2016-09 Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method) (ISO 8968-4:2016); German version EN ISO 8968-4:2016
DIN 10470:2011 Milk and milk products - Determination of whey protein content and casein content in total protein - Derivative spectroscopic method
DIN EN ISO 8968-4 E:2013-09 Determination of nitrogen content of milk and milk products Part 4: Determination of protein and non-protein nitrogen content and calculation of pure protein content (Reference Method) (Draft)
DIN 10470:1999 Determination of whey protein content and casein content in total protein of milk and milk products - Derivative spectroscopic method
DIN 10464:1994-08 Determination of casein content, casein and whey protein contents in total protein of milk and milk products - Casein-phosphorus method
DIN EN ISO 8968-4 E:2013 Draft Document - Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non protein nitrogen content and true protein content calculation (Reference method) (ISO/DIS 8968-4:2013); German version prEN ISO 8968-...
DIN 10466:2001 Determination of whey protein content in total protein of milk and milk products - Polarographic method
DIN 10470:2011-07 Milk and milk products - Determination of whey protein content and casein content in total protein - Derivative spectroscopic method
DIN EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content (ISO 8968-5:2001); German version EN ISO 8968-5:2001
DIN EN ISO 8968-4:2016 Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method) (ISO 8968-4:2016); German version EN ISO 8968-4:2016
DIN 10470 E:2010 Draft Document - Milk and milk products - Determination of whey protein content and casein content in total protein - Derivative spectroscopic method
DIN 10470 E:2010-05 Draft Document - Milk and milk products - Determination of whey protein content and casein content in total protein - Derivative spectroscopic method
DIN EN ISO 8968-4:2002 Milk - Determination of nitrogen content - Part 4: Determination of the non-protein-nitrogen content (ISO 8968-4:2001); German version EN ISO 8968-4:2001
DIN ISO 5550 E:2020-06 Caseins and caseinates - Determination of moisture content (Reference method)
DIN 10453:1983-03 Determination of water content of caseins and caseinates; reference method
DIN ISO 5550:2020-12 Caseins and caseinates - Determination of moisture content (Reference method) (ISO 5550:2006)
DIN EN ISO 8968-5:2002-06 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content (ISO 8968-5:2001)
DIN 10466:2001-09 Determination of whey protein content in total protein of milk and milk products - Polarographic method
DIN 10454:1983 Determination of protein content of caseins and caseinates; reference method
DIN EN ISO 21415-2:2008 Wheat and wheat flour - Gluten content - Part 2: Determination of wet gluten by mechanical means (ISO 21415-2:2006); English version of DIN EN ISO 21415-2:2008-04
DIN 10472:1996-06 Determination of casein and whey protein contents of milk and milk products - Electrophoretic method
DIN ISO 5550:2020 Caseins and caseinates - Determination of moisture content (Reference method) (ISO 5550:2006)
DIN EN ISO 21415-4:2007 Wheat and wheat flour - Gluten content - Part 4: Determination of dry gluten from wet gluten by a rapid drying method (ISO 21415-4:2006); German version EN ISO 21415-4:2007
DIN 10470:1999-07 Determining of whey protein content and casein content in total protein of milk and milk products by derivative spectroscopy
DIN EN ISO 20483:2007 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2006); German version EN ISO 20483:2006
DIN EN ISO 23319:2023-01 Cheese and processed cheese products, caseins and caseinates - Determination of fat content - Gravimetric method (ISO 23319:2022); German version EN ISO 23319:2022
DIN ISO 5550:2020-06 Draft Document - Caseins and caseinates - Determination of moisture content (Reference method) (ISO 5550:2006); Text in German and English

Standard Association of Australia （SAA）

AS ISO 8968.4:2021 Milk and milk products — Determination of nitrogen content, Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)

Association Francaise de Normalisation

NF EN ISO 8968-4:2016 Milk and dairy products - Determination of nitrogen content - Part 4: determination of protein and non-protein nitrogen content and calculation of true protein content (Reference method)
NF V04-221-4*NF EN ISO 8968-4:2016 Milk and milk products - Determination of nitrogen content - Part 4 : determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)
NF V04-387:1985 Caseins and caseinates. Determination of protein content (reference method).
NF V04-221-5:2002 Milk - Determination of nitrogen content - Part 5 : determination of protein-nitrogen content.
NF V04-221-4:2002 Milk - Determination of nitrogen content - Part 4 : determination of non-protein nitrogen content.
NF V04-389:1985 Caseins and caseinates. Determination of scorched particles content.
NF V04-388*NF ISO 5548:2008 Caseins and caseinates - Determination of lactose content - Photometric method.
NF V03-032:2024 Foodstuffs - Determination of the nitrogen content by the Kjeldahl method and calculation of the protein content
NF V18-100:1977 Animal feeding stuffs.determination of nitrogen for the calcultion of crude protein content.
NF ISO 5548:2008 Caseins and caseinates - Determination of lactose content - Photometric method
NF ISO 5550:2007 Caseins and caseinates - Determination of moisture content (reference method)
NF V04-382:1988 Caseins and caseinates. Determination of fat content. Gravimetric method (reference method).
NF V04-382:2008 Caseins and caseinates - Determination of fat content - Gravimetric method (Reference method).
NF V03-750*NF EN ISO 20483:2014 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method
NF V03-750:2007 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method.
NF V04-216:1985 Milk. Determination of protein content. Amido black dye-binding method (routine method).
NF EN ISO 23319:2022 Cheeses and processed cheeses, caseins and caseinates - Determination of fat content - Gravimetric method
NF V04-216:2011 Milk - Determination of protein content - Amido black dye-binding method (routine method).
NF EN ISO 14244:2016 Oilseed meals - Determination of soluble protein content in potassium hydroxide solution
NF V04-407:2002 Meat, meat product and fishery products - Determination of nitrogen content and calculation of the protein content - Kjeldahl method.
NF V04-558*NF EN ISO 23319:2022 Cheese and processed cheese products, caseins and caseinates - Determination of fat content - Gravimetric method

Danish Standards Foundation

DANSK DS/EN ISO 8968-4:2016 Milk and milk products – Determination of nitrogen content – Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)
DS/ISO 5739:2003 Caseins and caseinates - Determination of contents of scorched particles and of extraneous matter
DS/EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content
DANSK DS/ISO 5739:2003 Caseins and caseinates - Determination of contents of scorched particles and of extraneous matter
DS/EN ISO 8968-4:2002 Milk - Determination of nitrogen content - Part 4: Determination of non-protein nitrogen content
DANSK DS/ISO 23319:2022 Cheese and processed cheese products, caseins and caseinates – Determination of fat content – Gravimetric method

Spanish Association for Standardization (UNE)

UNE-EN ISO 8968-4:2016 Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method) (ISO 8968-4:2016)
AENOR UNE-EN ISO 8968-4:2016 Milk and dairy products. Determination of nitrogen content. Part 4: Determination of protein and non-protein nitrogen content and calculation of true protein content (Reference method). (ISO 8968-4:2016)
UNE 34871:1986 PROCESSED CHEESE PRODUCTS. DETERMINATION OF THE PROTEIN CONTENT.
UNE 34-871-1986 Processed cheese. Determination of protein content
AENOR UNE-EN ISO 8968-5:2002 Milk. Determination of nitrogen content. Part 5: Determination of protein nitrogen content. (ISO 8968-5:2001)
UNE 34827:1983 DETERMINATION OF THE CASEIN CONTENT OF MILK.
UNE-EN ISO 8968-4:2002 Milk - Determination of nitrogen content - Part 4: Determination of non-protein nitrogen content. (ISO 8968-4:2001)
UNE-EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content. (ISO 8968-5:2001)
UNE-EN 15948:2015 Determination of moisture and protein content in cereals by near infrared spectroscopy

Austrian Standards

ONORM DIN 10454-1993 Determination of protein content of caseins and caseinates - Reference method
ONORM DIN 10453-1993 Determination of water content of caseins and caseinates - Reference method
ONORM DIN 10334-1994 Determination of nitrogen content of milk according to Kjeldahl and calculation of crude protein content

Standards Norway

NS-EN ISO 8968-4:2016 Milk and milk products — Determination of nitrogen content — Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method) (ISO 8968-4:2016)
NS-EN ISO 8968-5:2001 Milk — Determination of nitrogen content — Part 5: Determination of protein-nitrogen content (ISO 8968-5:2001)
NS-EN ISO 8968-4:2001 Milk — Determination of nitrogen content — Part 4: Determination of non-protein nitrogen content (ISO 8968-4:2001)

Lithuanian Standards Office

LST ISO 5549:2001 Caseins and caseinates. Determination of protein content (Reference method) (identical ISO 5549:1978)
LST EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content (ISO 8968-5:2001)
LST ISO 5548:2004 Caseins and caseinates. Determination of lactose content. Photometric method (idt ISO 5548:2004)
LST ISO 5543:2004 Caseins and caseinates. Determination of fat content. Gravimetric method (Reference method) (idt ISO 5543:2004)
LST ISO 5739:2003 Caseins and caseinates. Determination of contents of scorched particles and of extraneous matter (idt ISO 5739:2003)

Gosstandart of Russia

GOST 10846-1991 Grain and products of its processing. Method for determination of protein
GOST R 51470-1999 Caseins and caseinates. Method for determination of protein content
GOST ISO 8968-4-2021 Milk and dairy products. Determination of nitrogen content. Part 4. Determination of protein and non-protein nitrogen content and calculation of true protein content (reference method)..
GOST R 51469-1999 Caseins and caseinates. Photometric method for determination of lactose content
GOST R 51464-1999 Caseins and caseinates. Method for determination of water content
GOST 13496.4-1993 Fodder, mixed fodder and animal feed raw stuff. Methods of nitrogen and crude protein determination
GOST 13496.4-2019 Fodder, мixed fodder and raw mixed fodder. Methods of nitrogen and crude protein determination
GOST 13496.4-1984 Fodder, mixed fodder and animal feed raw stuff. Methods of nitrogen and crude protein determination
GOST R 51454-1999 Caseins and caseinates. Method of determination of nitrate and nitrite contents
GOST R 51465-1999 Caseins and caseinates. Determination of scorched particles content
GOST R 52993-2008 Caseins and caseinates. Determination of moisture content (Reference method)
GOST 34454-2018 Dairy products. Determination of protein content by the Kjeldahl method
GOST 23327-1978 Milk. Methods for determination of the total protein content
GOST ISO 5550-2017 Caseins and caseinates. Determination of moisture content (Reference method)
GOST 23327-1998 Milk and milk products. Determination of mass part of total nitrogen by Kjeldahl method and determination of mass part of protein
GOST R 51463-1999 Rennet caseins and caseinates. Method for determination of ASH content
GOST ISO 5545-2016 Rennet caseins and caseinates. Determination of ash content. (Reference method)
GOST ISO 5548-2016 Caseins and caseinates. Photometric method for determining the mass fraction of lactose
GOST 34551-2019 Сonfectionery. Method for determination of mass fraction of protein

European Committee for Standardization (CEN)

EN ISO 8968-4:2001 Milk - Determination of Nitrogen Content - Part 4: Determination of Non-Protein Nitrogen Content
EN ISO 8968-4:2016 Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)
EN ISO 8968-5:2001 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content (ISO 8968-5:2001)
EN ISO 20483:2013 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method
EN ISO 21415-2:2008 Wheat and wheat flour - Gluten content - Part 2: Determination of wet gluten by mechanical means
EN ISO 20483:2006 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method
EN ISO 5983-2:2005 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 2: Block digestion/steam distillation method

Swedish Institute for Standards

SS-EN ISO 8968-4:2017 Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method) (ISO 8968-4:2016)
SS-EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content (ISO 8968-5:2001)
SS-EN ISO 8968-4:2002 Milk - Determination of nitrogen content - Part 4: Determination of non-protein nitrogen content (ISO 8968-4:2001)

Polski Komitet Normalizacyjny (PKN)

PN C04288-14-1987 Technical fats Methods of testing Determination of protein content

International Dairy Federation (IDF)

IDF 20-5-2001 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content
IDF 107-2003 Caseins and caseinates - Determination of contents of scorched particles and of extraneous matter
IDF 20-4-2001 Milk - Determination of nitrogen content - Part 4: Determination of non-protein-nitrogen content
IDF 78-2006 Caseins and caseinates. Determination of moisture content (Reference method)

The Directorate General of Specifications and Metrology (DGSM)

OS GSO ISO 8968-5:2014 Milk -- Determination of nitrogen content -- Part 5: Determination of protein-nitrogen content
OS GSO ISO 5548:2015 Caseins and caseinates -- Determination of lactose content -- Photometric method
OS GSO ISO 5543:2015 Caseins and caseinates -- Determination of fat content -- Gravimetric method (Reference method)
OS GSO ISO 5550:2015 Caseins and caseinates -- Determination of moisture content (Reference method)
OS GSO ISO 5983:2002 ANIMAL FEEDING STUFFS – DETERMINATION OF NITROGEN CONTENT AND CALCULATION OF CRUDE PROTEIN CONTENT

South African Bureau of Standard

SANS 8968-5:2006 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content
SANS 8968-4:2006 Milk - Determination of nitrogen content Part 4: Determination of non-protein-nitrogen content
SANS 6039:2005 Amylaceous and proteinaceous matter detection in wood adhesives
SANS 5218:2007 Water - Albuminoid ammonia content

COMMISSION FOR THE STANDARDS, METROLOGY AND QUALITY OF VIETNAM (STAMEQ)

TCVN 3705-1990 Aquatic products.Method for the determination of total nitrogen and protein content
TCVN 7871-3-2008 Wheat and wheat flour.Gluten content.Part 3: Determination of dry gluten from wet gluten by an oven drying method
TCVN 7253-2003 Tobacco and tobacco products.Determination of nitrogen protein content
TCVN 7871-4-2008 Wheat and wheat ftour.Gluten content.Part 4: Determination of dry gluten from wet gluten by a rapid drying method
TCVN 4328-1-2007 Animal feeding stuffs.Determination of nitrogen content and calculation of crude protein content.Part 1: Kjeldahl method
TCVN 8766-2011 Milk and milk products.Determination of protein content.Acid orange 12 dye-binding method
TCVN 7774-2007 Milk.Determination of protein content.Amido black dye-binding method (Routine method)

Magyar Szabványügyi Testület

MNOSZ 17619-1954 Definition of the concept of protein content in preserved foods
MSZ 05 26.1510-1983 Protein content 40-150
MSZ KGST 2787-1980 Determination of protein content of preservative foods
MSZ 6830/5-1981 Determination of feed nutrition for livestock herds, determination of digestible protein content
MSZ 12325-1982 Main protein content of milk

Tunisia Institut National de la Normalisation et de la Propriété Industrielle

NT 14.51-1983 Determination of casein content in milk

Portuguese Institute of Quality

NP 2935-1988 milk. Protein content was measured by the black starch method. current procedures

Japanese Industrial Standards Committee (JISC)

JIS K 0602:2000 Proteins -- Serum albumin -- Methods for quantitative analysis
JIS K 0605:2000 Proteins -- Trypsin -- Methods for quantitative analysis
JIS K 0606:2000 Proteins -- Transferrin -- Methods for quantitative analysis
JIS K 0603:2000 Proteins -- Immunoglobulin -- Methods for quantitative analysis

Indonesia Standards

SNI 14-1038-1989 Kertas dan karton, Cara uji kualitatip kasein dan protein kedelai

American Water Works Association (AWWA)

AWWA ACE58288 Xenobiotics? In My Drinking Water? What's a Water Utility to Do?

Clinical and Laboratory Standards Institute

CLSI C64-2021 Quantitative Measurement of Proteins and Peptides by Mass Spectrometry

Netherlands Institute for Standardization

NEN 3760-1984 Cheese - Determination of the nitrogen content according to Kjeldahl - Calculation of the crude protein content

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