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LST6124-2017 English PDF

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US$139.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
LST6124-2017: Inspection of grain and oils - Determination of polyphenol oxidase activity in wheat flour - Spectro-photometric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
LS/T 6124-2017	139	Add to Cart	3 days	Inspection of grain and oils - Determination of polyphenol oxidase activity in wheat flour - Spectro-photometric method	Valid

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Basic data

Standard ID: LS/T 6124-2017 (LS/T6124-2017)
Description (Translated English): Inspection of grain and oils - Determination of polyphenol oxidase activity in wheat flour - Spectro-photometric method
Sector / Industry: Food & Beverage Industry Standard (Recommended)
Classification of Chinese Standard: X11
Classification of International Standard: 67.060
Word Count Estimation: 6,667
Date of Issue: 2017-10-27
Date of Implementation: 2017-12-20
Issuing agency(ies): National Grain Administration

LST6124-2017: Inspection of grain and oils - Determination of polyphenol oxidase activity in wheat flour - Spectro-photometric method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Inspection of grain and oils-Determination of polyphenol oxidase activity in wheat flour-Spectro-photometric method ICS 67.060 X11 People's Republic of China food industry standard Determination of Polyphenol Oxidase Activity in Wheat Flour by Grain and Oil Released on.2017-10-27 2017-12-20 implementation National Food Bureau released

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the National Grain Administration. This standard is under the jurisdiction of the National Grain and Oil Standardization Technical Committee (SAC/TC270). This standard was drafted. Henan University of Technology, National Food Bureau Standard Quality Center, Henan Province Grain and Oilstuff Product Quality Supervision and Inspection Station, Anhui Provincial Grain and Oil Product Quality Supervision and Inspection Station, Shaanxi Provincial Grain and Oil Product Quality Supervision and Inspection Institute, Hubei Grain and Oil Food Quality Monitoring Station, Shanxi Food Quality Monitoring Center, Guangdong Product Quality Supervision and Inspection Institute, Guangdong National Grain Quality Monitoring Center. The main drafters of this standard. Chen Jie, Yan Ke, Lu Yingguo, Zhu Zhiguang, Li Xueqin, Wang Yuanhui, Wang Liqing, Yin Chenghua, Ji Yishun, Dang Xianmin, Wu Cunrong, Li Zhijian, Ren Zhengdong, Mao Hongxia, Wu Lili, Zhou Hongmei, Song Zewei, Wang Yajun. Determination of Polyphenol Oxidase Activity in Wheat Flour by Grain and Oil Spectrophotometry

1 Scope

This standard specifies the principle, reagents, instruments and equipment, analytical procedures and results of spectrophotometric determination of wheat phenolic oxidase activity. Calculation and precision. This standard applies to the determination of wheat powder polyphenol oxidase activity.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 6682 Analytical laboratory water specifications and test methods

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Polyphenol oxidase A class of copper-containing oxidoreductases that catalyze the oxidation of ortho-benzenediol to o-benzidine and also to the monophenol monooxygenase substrate. 3.2 Polyphenol oxidase activity unit Under the measurement conditions specified in this standard, the absorbance value per gram of sample changes by 0.001 to 1 polyphenol oxidase activity unit, U means.

4 Principle

The polyphenol oxidase in the sample is oxidized with catechol to form hydrazine, and the absorption intensity at a wavelength of 410 nm is measured by a spectrophotometer. Indicates the viability of polyphenol oxidase.

5 reagents

Unless otherwise specified, the reagents used in this method are of analytical grade, and the test water should meet the specifications of the secondary water in GB/T 6682. 5.1 catechol solution. Accurately weigh 1.300g of catechol, dissolve it in water, and dilute to a 100mL brown volumetric flask. 5.2 0.2mol/L pH6.0 sodium dihydrogen phosphate-disodium hydrogen phosphate buffer. weigh 31.2g sodium dihydrogen phosphate dihydrate, soluble in appropriate amount of distillation Dilute to 1000 mL in water; weigh 71.6 g of disodium hydrogen phosphate dodecahydrate, dissolve in appropriate amount of distilled water, dilute to 1000 mL; 87.7 mL Sodium dihydrogen phosphate solution and 12.3 mL of disodium hydrogen phosphate solution were mixed to obtain 0.2 mol/L sodium phosphate monobasic phosphate-dihydrogen phosphate Flush. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of LST6124-2017_English be delivered?

Answer: Upon your order, we will start to translate LST6124-2017_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of LST6124-2017_English with my colleagues?

Answer: Yes. The purchased PDF of LST6124-2017_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.