The main method of detecting protein

The main method of detecting protein, Total:218 items.

The international standard classification for "The main method of detecting protein" includes: General methods of tests and analysis for food products , Biology. Botany. Zoology , food products in general , Animal feeding stuffs , Edible oils and fats. Oilseeds , Fruits. Vegetables , Meat and meat products , Chemical reagents , Cereals, pulses and derived products , Man-made fibres , Protection against crime .

The Chinese standard classification for "The main method of detecting protein" includes: Basic standards and general methods , Environmental Condition and General Test Method , Biochemical reagent and clinical analysis reagent , Food sanitation , Basic standards and general methods , Food processing and products in general , Livestock and poultry feed and additive , Oil crop and product , Other cash crops , Melon, fruit and vegetable planting and product , Meat processing and products , Cereal crop and forage crop in general , Basic standard and general method on forestry , Basic Subject in general , Chemical fibre in general , Crime judging technology .

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

GB/T 35809-2018 Method for analysis of forestry biomass—Determination of protein content
GB/T 14489.2-1993 Method for determination of crude protein in oilseed
GB/T 46117-2025 Inspection of grain and oils—Determination of water-soluble protein in soya bean
GB/T 17811-1999 Determination of digestibility in animal protein feeds--Pepsin method
GB/T 17811-2025 Determination of pepsin digestibility for animal-derived protein feeds—Filtration method
GB/T 24901-2010 Inspection of grain and oils—Determination of crude protein in maize—Near-infrared method
GB 8856-1988 Method for Determination of Crude Protein in Fruit and Vegetable Products
GB/T 5511-1985 Inspection of grain and oilseeds--Methods for determination of crude protein
GB/T 5009.5-2003 Determination of protein in foods
GB/T 24897-2010 Inspection of grain and oils—Crude protein determination in rice—Near-infrared method
GB/T 24871-2010 Inspection of grain and oils—Crude protein determination in wheat flour—Near-infrared method
GB/T 17811-2008 Determination of pepsin digestibility in animal protein feeds - Filtration method
GB/T 5009.5-1985 Method for determination of protein in foods
GB/T 34800-2017 Detection method of activity and impurity of proteinase K
GB/T 14489.2-2008 Inspection of grain and oils—Determination of crude protein in oilseeds
GB/T 14771-1993 Method for determination of protein content in foods
GB/T 33410-2016 Determination of the activity of protease K in biochemical reagents
GB/T 41366-2022 Livestock and poultry meat quality testing—Determination of moisture,protein and fat—Near-infrared spectroscopy method
GB/T 24870-2010 Inspection of grain and oils—Crude protein and crude fat determination in soybean—Near-infrared method
GB/T 40225-2021 Determination of actin antibody—Western blotting method
GB/T 24899-2010 Inspection of grain and oils—Determination of crude protein in wheat—Near-infrared method
GB/T 35534-2017 Examination methods of pancreatic digest of casein
GB/T 15673-1995 Method for determination of crude protein in edible fungi
GB/T 19495.8-2004 Detection of genetically modified plants and derived products-Protein based methods
GB/T 8856-1988 Method for determination of crude protein in fruit and vegetable products

Taiwan Provincial Standard of the People's Republic of China

CNS 5035-1986 Method of Test for Crude Protein in Food
CNS 2770.5-1986 Method of Test for Feeds : Determination of Crude Protein
CNS 6511-2008 Method of test for meat and meat products - Determination of crude protein content
CNS 3449-2007 Method of test for milk and milk products - Determination of protein
CNS 3449-1988 Methods of Test for Milk and Milk Products: The Quantitive Analysis of Protein
CNS 2770-5-1986 Method of Test for Feeds : Determination of Crude Protein

Professional Standard - Commodity Inspection

SN/T 0803.9-1999 Oil bearing materials for import and export—Method for the determination of crude protein
SN/T 2545-2010 Testing Method of Thermal Denaturation Protein in Animal Derived Food
SN/T 0800.3-1999 Cereals and feedstuffs for import and export - Method for the determination of crude protein

Group Standards of the People's Republic of China

T/SHNX 001-2025 Determination of lactoferrin, α-lactalbumin and β-lactoglobulin in raw bovine milk by liquid chromatography-tandem mass spectrometry
T/QGCML 2180-2023 Western Blot detection technical specifications
T/ZGKSL 005-2023 Quality requirements and efficacy assessment for recombinant collagen
T/CVMA 17-2020 Newcastle disease virus V protein antibody indirect ELISA detection method

Professional Standard - Textile

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

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

Professional Standard - Machinery

JB/T 12964-2016 Fast analyzer for the protein in milk and powder milk

Professional Standard - Agriculture

2330药典二部-2010 Appendix VII M Determination of protein content
176药典三部-2010 Appendix Ⅵ ⅥB protein assay
农业部2630号公告-12-2017 Evaluation method of foreign protein detection test paper for detection of components of transgenic plants and their products
NY/T 3512-2019 Non-destructive determination of protein in meat- Near-infrared spectroscopy method
92药典四部-2020 0700 Other Determination Methods 0731 Determination of Protein Content
220药典三部-2020 Content Determination Method 0731 Protein Content Determination Method

Jilin Provincial Standard of the People's Republic of China

DB22/T 2002-2014 Protein Rapid Detector in Milk and Milk Powder
DB22/T 294-2020 Method for identification of adulteration of crude protein in corn gluten meal

Professional Standard - Medicine

YY/T 1847-2022 Anti-human globulin reagents(column agglutination technique, CAT)

Hebei Provincial Standard of the People's Republic of China

DB13/T 1098-2009 Determination of protein in feed

Professional Standard - Public Safety Standards

GA 765-2008 Detection method of human hemoglobin—Rapid test strip
GA/T 765-2020 Methods for detection of human hemoglobin—Rapid test strip
GA/T 819-2009 Analytical method of acid dyes on the protein fibers

Standard Association of Australia （SAA）

AS 1871.9:1976 List of methods for examination of waters Nitrogen (albuminoid)
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)

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 57 0111-3-2002 Testing methods for casein and caseinates - Determination of moisture
CSN 57 0111-12-2002 Testing methods for casein and caseinates - Determination of pH
CSN 57 0111-7-2002 Testing methods for casein and caseinates - Determination of ash
CSN 56 0186 Cast.12-1981 Testing methods for beer. art 12. etermination of proteins
CSN 57 0111-1-2002 Testing methods for casein and caseinates - General regulations
CSN 57 0111-2-2002 Testing methods for casein and caseinates - Methods of samphng of Chemical analysis
CSN 46 7092-27-1998 Testing methods for feeding stuffs - Part 27: Determination of the protein content
CSN 57 0111-8-2002 Testing methods for casein and caseinates - Determination of titratable acidity
CSN 57 0105 Cast.5-1984 Powdered and condensed milk products. Testing methods. Determination of protein content

Indonesia Standards

SNI 14-1037-1989 Kertas dan karton, Cara uji lapisan salut berperekat protein
SNI 14-1038-1989 Kertas dan karton, Cara uji kualitatip kasein dan protein kedelai

German Institute for Standardization

DIN 10454:1983-03 Determination of protein content of caseins and caseinates; reference method
DIN EN ISO 21572 Berichtigung 1:2005 Food – Methods for the detection of genetically modified organisms and their products – Protein methods
DIN EN ISO 21572:2004 Food – Methods for the detection of genetically modified organisms and their products – Protein methods
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 10456:1989-04 Determination of pH of caseins and caseinates; reference 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 10466:2001 Determination of whey protein content in total protein of milk and milk products - Polarographic method
DIN ISO 5546 E:2020-08 Caseins and caseinates - Determination of pH (Reference 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 10470:2011 Milk and milk products - Determination of whey protein content and casein content in total protein - Derivative spectroscopic method
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 10452:1983-03 Determination of ash of rennet caseins and caseinates; reference method
DIN ISO 5550:2020-12 Caseins and caseinates - Determination of moisture content (Reference method) (ISO 5550:2006)
DIN 10464:1994 Determination of casein content, casein and whey protein contents in total protein of milk and milk products - Casein-phosphorus method
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 ISO 5546:2020-12 Caseins and caseinates - Determination of pH (Reference method) (ISO 5546:2010)
DIN ISO 5545 E:2020-06 Rennet caseins and caseinates - Determination of ash (Reference method)
DIN EN ISO 21572:2004-06 Foodstuffs - Methods for the detection of genetically modified organisms and derived products - Protein based method (ISO 21572:2004)
DIN ISO 5546:2020 Caseins and caseinates - Determination of pH (Reference method) (ISO 5546:2010)
DIN EN ISO 21572:2020-02 Foodstuffs - Molecular biomarker analysis - Immunochemical methods for the detection and quantification of proteins (ISO 21572:2019); German version EN ISO 21572:2019
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 ISO 5545:2020-12 Rennet caseins and caseinates - Determination of ash (Reference method) (ISO 5545:2008)

Austrian Standards

ONORM DIN 10454-1993 Determination of protein content of caseins and caseinates - Reference method
ONORM DIN 10456-1993 Determination of pH of caseins and caseinates - Reference method
ONORM DIN 10453-1993 Determination of water content of caseins and caseinates - Reference method

Gosstandart of Russia

GOST 25179-1990 Milk. Methods for determination of protein
GOST R 51470-1999 Caseins and caseinates. Method for determination of protein content
GOST 25179-2014 Milk and milk products. Method for determination of protein
GOST 34551-2019 Сonfectionery. Method for determination of mass fraction of protein
GOST R 51467-1999 Caseins and caseinates. Method for determination of pH
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 25011-1981 Meat and meat products. Methods of protein determination
GOST 25011-2017 Meat and meat products. Protein determination methods
GOST R 51464-1999 Caseins and caseinates. Method for determination of water content
GOST R 51466-1999 Caseins. Method for determination of "fixed ash" mass fraction
GOST 13979.3-1968 Oilcakes oil-meals. Methods of determination of soluble proteins
GOST 31978-2012 Caseins and caseinates. Method for determination of pH
GOST 10846-1991 Grain and products of its processing. Method for determination of protein
GOST R 51454-1999 Caseins and caseinates. Method of determination of nitrate and nitrite contents
GOST ISO 21572-2009 Food products Analytical methods for the detection of genetically modified organisms and derivative products Protein based methods
GOST ISO 5548-2016 Caseins and caseinates. Photometric method for determining the mass fraction of lactose
GOST R 54478-2011 Grain. Methods of determination quantity and quality of gluten in wheat
GOST 28075-1989 Vegetable fodder. Method for the determination of crude protein splitting
GOST ISO 5550-2017 Caseins and caseinates. Determination of moisture content (Reference method)
GOST R 51463-1999 Rennet caseins and caseinates. Method for determination of ASH content
GOST 28074-1989 Vegetable fodder. Method for the determination of crude protein solubility

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
JIS K 0604:2000 Proteins -- Monoclonal IgG -- Methods for quantitative analysis

Korean Agency for Technology and Standards (KATS)

KS H 1204-2021 Testing method for crude proteins content
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 1204-2012 Testing method for crude proteins content
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 1204-2001 Testing method for crude proteins content
KS H 1204-2022 Testing method for crude proteins content
KS J ISO 21572-2019 Foodstuffs－Methods for the detection of genetically modified organisms and derived products－Protein based methods
KS J ISO 21572-2009(2019) Foodstuffs－Methods for the detection of genetically modified organisms and derived products－Protein based methods
KS J ISO 21572-2024 Foodstuffs－Methods for the detection of genetically modified organisms and derived products－Protein based methods
KS J ISO 21572:2009 Foodstuffs-Methods for the detection of genetically modified organisms and derived products-Protein based methods
KS P 1015-2012 Establishment of a reference material and evaluation method for troponin-based cardiovascular diagnostics
KS H ISO 5546:2006 Caseins and caseinates－Determination of pH(Reference method)

International Organization for Standardization (ISO)

ISO 5549:1978 Caseins and caseinates; Determination of protein content (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 21572:2004 Foodstuffs - Methods for the detection of genetically modified organisms and derived products - Protein based methods
ISO 21572:2013 Foodstuffs - Molecular biomarker analysis - Protein-based methods
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 5546:2010 Caseins and caseinates - Determination of pH (Reference method)
ISO 5546:2010|IDF 115:2010 Determination of pH value of casein and caseinate (standard method)
ISO 5546:2010 | IDF 115:2010 Caseins and caseinates — Determination of pH (Reference method)
ISO 20483:2006 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method

Magyar Szabványügyi Testület

MNOSZ 448-28.lap-1955 Water testing - amino acid protein testing
MNOSZ 9603-1952 Casein sample collection and general testing methods

Bureau of Indian Standards

IS 7481-1974 How to measure protein efficiency ratio (PER)
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 7219-1973 Methods for determination of protein in food and feed
IS 11962-1987 Method for determination of ash content in chymosin casein and caseinate (reference method)
IS 11920-2012 Cassein and Caseinates -Determination of Moisture Content (Reference Method)
IS 11963-1987 Photometric method for determination of lactose content in casein and caseinate
IS/ISO 21572-2019 Foodstuffs-Molecular Biomarker Analysis- Immunochemical Methods for the Detection and Quantification of Proteins
IS 11888-2005 Casiens And Caseinated - Determination Of Contents Of Scorched Particles And Of Extraneous Matter
IS 2006-1988 Methods for the quantitative chemical analysis of binary mixtures of protein fibers and certain other non-protein fibers
IS 11888-1987 Method for determination of charred particle content in casein and caseinates
IS 11962-2012 Rennet Caseins and Caseinates—— Determination of Ash (Reference Method)

Spanish Association for Standardization (UNE)

AENOR UNE 34400-7:1967 Test methods for wheat flour. Determination of protein.
UNE 34400-7:1967 TEST METHODS OF WHEAT FLOUR. PROTEIN DETERMINATION
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)
UNE 34080:1974 ANALYSIS METHODS FOR CHOCOLATES. DETERMINATION OF TOTAL NITROGEN. (PROTEINS).
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-EN ISO 21572:2004 Foodstuffs - Methods for the detection of genetically modified organisms and derived products - Protein based methods (ISO 21572:2004)
UNE 34081:1975 ANALYSIS METHODS FOR CHOCOLATES. MILK PROTEINS.
AENOR UNE 77059:2002 Water quality. Determination of aluminum. Colorimetric method with eriochromocyanin R.

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 21572:2004 Foodstuffs. Methods for the detection of genetically modified organisms and derived products. Protein based methods
BS 6248-9:1984 Caseins and caseinates-Method for the determination of scorched particles
BS ISO 5546:2010 Caseins and caseinates - Determination of pH (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 6248-10:1986 Caseins and caseinates-Method for determination of fat (gravimetric reference method)
BS ISO 5545:2008 Rennet caseins and caseinates - Determination of ash (Reference method)

American Society for Testing and Materials (ASTM)

ASTM F831-83 Net Protein Ratio (NPR) Test Method
ASTM D7818-12 Standard Test Method for Enumeration of Proteolytic Bacteria in Fresh (Uncured) Hides and Skins
ASTM D7427-16 Standard Test Method for Immunological Measurement of Four Principal Allergenic Proteins (Hev b 1, 3, 5 and 6.02) in Hevea Natural Rubber and Its Products Derived from Latex
ASTM F830-83 Method for preparing meat, by-products and meat products for determining protein efficiency ratio or net protein ratio
ASTM D7427-08 Standard Test Method for Immunological Measurement of Four Principal Allergenic Proteins (Hev b 1, 3, 5 and 6.02) in Natural Rubber and Its Products Derived from Latex
ASTM D7427-16(2021) Standard Test Method for Immunological Measurement of Four Principal Allergenic Proteins (Hev b 1, 3, 5 and 6.02) in Hevea Natural Rubber and Its Products Derived from Latex
ASTM D2169-66 Method for determining the odor of whey protein
ASTM D6188-17 Standard Test Method for Viscosity of Cellulose by Cuprammonium Ball Fall

Ente Nazionale Italiano di Unificazione

UNI 22632:2002 Oilseeds - Vegetable proteins content - Determination of total proteins (biuret method)
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 21572:2006 Foodstuffs - Methods for the detection of genetically modified organisms and derived products - Protein based methods
UNI ISO 5543:2018 Caseins and caseinates -- Determination of fat content -- Gravimetric method (Reference method)
UNI EN ISO 21572:2019 Foodstuffs - Molecular biomarker analysis - Immunochemical methods for the detection and quantification of proteins
UNI 22629:2002 Oilseeds - Vegetable proteins content - Determination of soluble proteins (Bradford method)

South African Bureau of Standard

SANS 21572:2005 Foodstuffs - Methods for the detection of genetically modified organisms and derived products - Protein based methods
SANS 6039:2005 Amylaceous and proteinaceous matter detection in wood adhesives

Lithuanian Standards Office

LST ISO 5549:2001 Caseins and caseinates. Determination of protein content (Reference method) (identical ISO 5549:1978)
LST EN ISO 21572:2004/AC:2005 Foodstuffs - Methods for the detection of genetically modified organisms and derived products - Protein based methods (ISO 21572:2004)
LST EN ISO 21572:2004 Foodstuffs - Methods for the detection of genetically modified organisms and derived products - Protein based methods (ISO 21572:2004)

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)

Association Francaise de Normalisation

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 ISO 5546:2010 Caseins and caseinates - Determination of pH (Reference method)
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 EN ISO 21572:2019 Food products - Molecular biomarker analysis - Immunochemical methods for protein detection and quantification
NF ISO 5550:2007 Caseins and caseinates - Determination of moisture content (reference method)
NF ISO 5545:2008 Rennet caseins and caseinates - Determination of ash (Reference method)

GCC Standardization Organization

GSO 2505:2016 Method of tests for soya protein products
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)

The Directorate General of Specifications and Metrology (DGSM)

OS GSO 2505:2016 Method of tests for soya protein products

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 21572:2004 Foodstuffs - Methods for the detection of genetically modified organisms and derived products - Protein based methods (ISO 21572:2004)

National Standardisation Body (ASRO)

STAS 2213/17-1976 SWEETS Determination of total proteinic content and milk proteinic substance content
STAS SR 13348-1-1996 Tea. Analysis methods. Determination of proteic nitrogen by the Kjeldahl method. Spectrophotometric method
SR ISO 5549:1996 Caseins and caseinates - Determination of protein content (Reference 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)

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

TCVN 7607-2007 Foodstuffs.Methods of analysis for the detection of genetically modified organisms and derived products.Protein based methods
TCVN 3705-1990 Aquatic products.Method for the determination of total nitrogen and protein content

International Dairy Federation (IDF)

IDF 90-2008 Rennet caseins and caseinates - Determination of ash (Reference method)
IDF 78-2006 Caseins and caseinates. Determination of moisture content (Reference method)

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)

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)

Argentine Institute of Standardization

IRAM 15 707-1963 How to measure plant protein in food

Clinical and Laboratory Standards Institute

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

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