|
US$139.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
LST6119-2017: Inspection of grain and oils - Determination of polyphenols in vegetable oil - Spectrometric method
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| LS/T 6119-2017 | English | 139 |
Add to Cart
|
3 days [Need to translate]
|
Inspection of grain and oils - Determination of polyphenols in vegetable oil - Spectrometric method
| Valid |
LS/T 6119-2017
|
PDF similar to LST6119-2017
Basic data | Standard ID | LS/T 6119-2017 (LS/T6119-2017) | | Description (Translated English) | Inspection of grain and oils - Determination of polyphenols in vegetable oil - Spectrometric method | | Sector / Industry | Food & Beverage Industry Standard (Recommended) | | Classification of Chinese Standard | X04 | | Classification of International Standard | 67.040 | | Word Count Estimation | 6,634 | | Date of Issue | 2017-09-08 | | Date of Implementation | 2017-09-15 | | Regulation (derived from) | China Grain Feed (2017) 5; Industry Standard Filing Announcement 2017 No. 11 (Total No. 215) | | Issuing agency(ies) | National Grain Administration | LST6119-2017: Inspection of grain and oils - Determination of polyphenols in vegetable oil - Spectrometric 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 polyphenols in vegetable oil-Spectrometric method
ICS 67.040
X04
People's Republic of China food industry standard
Determination of polyphenols in vegetable oils by grain and oil
Published on.2017-09-08
2017-09-15 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. National Institute of Grain Science, State Forestry Administration, state-owned forest farms and forest seedlings work station, China Textiles and Grains
Export limited liability company, China Food Products Marketing Co., Ltd.
The main drafters of this standard. Zhang Dong, Yang Chao, Xue Yalin, Zhao Bing, Ou Guoping, Zhu Lin, Liu Baozhen, An Jun.
Determination of polyphenols in vegetable oils by grain and oil
1 Scope
This standard specifies the principle, reagents, instruments, sample preparation, operation steps and knots for the determination of polyphenol content in vegetable oil by spectrophotometry.
Fruit representation and precision.
This standard applies to the determination of polyphenol content in vegetable oils.
The detection limit of this standard is 6mg/kg.
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 6379.1 Accuracy of measurement methods and results (accuracy and precision) Part 1. General and definition
GB/T 6379.2 Accuracy of measurement methods and results (accuracy and precision) Part 2. Determination of standard method of measurement
Basic method of sex and reproducibility
GB/T 6682 Analytical laboratory water specifications and test methods
Preparation of GB/T 15687 animal and vegetable oil and fat samples
3 Principle
After the polyphenols in the vegetable oil are purified by the diol-based cartridge, the forin phenol reagent oxidizes the -OH group in the polyphenol and is blue, at the maximum absorption wavelength.
The absorbance of the solution was measured at 750 nm, and the polyphenol content in the vegetable oil was quantitatively determined using gallic acid as a calibration standard.
4 reagents
Analytically pure reagents should be used in the analysis unless otherwise stated. Water is the recommended tertiary water for GB/T 6682.
4.1 Methanol. Chromatographically pure.
4.2 Hexane. Chromatographically pure.
4.3 Methanol-water solution. Accurately transfer 50 mL of methanol (4.1) to a 100 mL volumetric flask and bring up to volume with water.
4.4 Sodium carbonate.
4.5 Folin-ciocalteu reagent.
4.6 7.5% sodium carbonate solution (mass concentration). Weigh 7.5g ± 0.01g sodium carbonate (4.4), add appropriate amount of water to dissolve, transfer to 100mL capacity
In a measuring flask, dilute to the mark with water and shake well.
4.7 Gallic acid standard. purity ≥ 98%, relative molecular mass 170.12.
4.8 Gallic acid standard stock solution (1mg/mL). Weigh 0.100g ± 0.001g gallic acid standard (4.7), add a small amount of methanol
(4.1) After dissolving, transfer to a 100 mL volumetric flask, dilute to volume with water, and shake well.
4.9 Gallic acid working solution. Pipette 1.0mL, 2.0mL, 3.0mL, 4.0mL, 5.0mL gallic acid reserve solution with pipette
(4.8) In a 100mL volumetric flask, dilute to the mark with water and shake well, the concentration is 10μg/mL, 20μg/mL, 30μg/mL,
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of LST6119-2017_English be delivered?Answer: Upon your order, we will start to translate LST6119-2017_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 LST6119-2017_English with my colleagues?Answer: Yes. The purchased PDF of LST6119-2017_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+ countriesQuestion 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 [email protected]. 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.
|