GH/T 1260-2019 in English

VALID

Method for Moisture，Total Polyphenols and Caffeine in Instant Tea in Solid Form -Near infrared reflectance spectroscopy

Issued on:2019-05-21
Implemented on:2019-12-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $150.00
$146.00

Standard No:	GH/T 1260-2019
Document status:	VALID
Title in English:	Method for Moisture，Total Polyphenols and Caffeine in Instant Tea in Solid Form -Near infrared reflectance spectroscopy
Title in Chinese:	固态速溶茶中水分、茶多酚、咖啡碱含量的近红外光谱测定法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2019-05-21
Implemented on:	2019-12-01
ICS Classification:	67.140.10-Tea
Chinese Classification:	X55-Tea products
Related Keywords:	solid instant tea ingredients instant tea vibration tea solid form -near reflectance spectroscopy introduction technical background
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Introduction

Technical background and industry value of the standard

As the first technical specification for the rapid detection of solid instant tea ingredients in the supply and marketing cooperative industry, this standard fills the technical gap of the low efficiency of traditional chemical analysis methods. Near-infrared spectroscopy technology can achieve simultaneous detection of three indicators within 1 minute, which is more than 90% more efficient than traditional methods.

Core Detection Principle

Based on the molecular vibration frequency doubling absorption characteristics, by establishing a mathematical model of near infrared spectrometer and chemical values, the following can be achieved:

Detection index	Characteristic absorption peak (nm)	Chemical bond type
Water	1450-1470	OH stretching vibration
Tea polyphenols	1680-1720	C=O/C=C conjugation
Caffeine	1520-1560	CN/NH vibration

Key instrument parameter requirements

Taking the NIR-3000 near-infrared spectrometer of Hangzhou Puyu Technology as an example, its technical indicators fully meet the requirements of clause 5.1 of the standard:

Wavelength accuracy: 0.1nm (better than the standard requirement of 0.2nm)
Sample dish temperature control: ±0.5℃ constant temperature system
Model compatibility: Supports multiple algorithms such as PLS/ANN

Key indicators for model verification

According to clause 7.2 of the standard, the verification must also meet the following requirements:

Performance parameters	Water content	Tea polyphenols	Caffeine
SEP threshold	≤0.3%	≤2.0%	≤0.5%
Repeatability sr	≤0.10%	≤0.50%	≤0.20%

Implementation suggestions

Sample pretreatment: Ensure that the particle size is consistent with that of the calibration model sample (80 mesh sieve is recommended)
Temperature control: The laboratory should maintain a constant temperature of 25±2℃
Model update: When the origin of the raw materials changes, 50 new samples need to be added to rebuild the model
Exception handling: It is recommended to use HPLC as the arbitration method (refer to ISO 10727/14502)