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反油酸_112-79-8
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反油酸

BW904002 {{goodObj.price > 0 ? '¥' + goodObj.price : '咨詢'}} ¥{{goodObj.sell_price || 0}} 咨詢 112-79-8 100mg {{goodObj.date}} 秦境 {{item.norm}} 99.4% {{inventory}}
反油酸介紹:

Reference Material

This certificate is designed in accordance with ISO17034 and ISO Guide 31. This reference material (RM) was designed,produced andverified in accordance with ISO/IEC 17025, ISO 17034 and a registered qualitymanagement system ISO9001.

Product Name

Elaidic acid

Product Code

BW904002

Lot Number

23061523

CAS No.

112-79-8

Mol. Formula

C18H34O2

Mol. Weight

282.46

Certified on

2 Jun 2023

Expiry Date

1 Jun 2025

Storage Temp

4°C ± 4°C

Specification

100 mg

CERTIFIED

Purity

CERTIFIED

Expanded Uncertainty (U)

Approved by

99.4%

0.5%

Uncertainty

The certified value(s) and uncertainty(ies) aredetermined in accordance with ISO 17034 with an 95% confidence level (k=2). Uncertaintyis based on the Total Combined Uncertainty, including uncertainties ofcharacterisation, homogeneity and stability testing. Stability values are basedon real evidence opposed to simulation.

The producer certifies that this reference materialmeets the specification stated in this certificate until the expiry date,provided it is stored unopened at the recommended temperature herein. Productwarranties for this reference material are set out in the terms and conditionsof purchase.

Intended Use

This RM is intended for use in a laboratory as acalibration and quality control standard or in method development foranalytical techniques.

Safety

Proper precautions should be observed whilehandling. See Safety Data Sheet.

Traceability

The balances used for gravimetric measurements arecalibrated with weights traceable to the national standards (DKD). Thecalibration of the balances is verified daily internally and annually by anexternal7 accredited calibration service. Chromatographic methods are traceableto the International System of Units (SI).

Homogeneity

Random replicate samples of the final packaged RMhave been analysed to prove homogeneity compliant with ISO 17034.

Storage

The RM should be stored in the original sealedcontainer at the indicated temperature.

Instructions for use

It is recommended to use 1 mg as the minimum samplesize and if less material is used, to increase the certified uncertainty by afactor of two for half sample and four for a quarter of sample. If storageafter opening is necessary, the RM should be tightly closed and kept from lightand moisture. If the RM was in a sealed ampoule, it should be transferred to avial with minimum head space.


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國(guó)家標(biāo)準(zhǔn)解讀:《食品安全國(guó)家標(biāo)準(zhǔn) 食品中脂肪酸的測(cè)定》
標(biāo)準(zhǔn)名稱及標(biāo)準(zhǔn)號(hào)GB 5009.168-2016《食品安全國(guó)家標(biāo)準(zhǔn) 食品中脂肪酸的測(cè)定》
適用范圍適用于食品(含油脂、乳制品等)中脂肪酸的測(cè)定,包括反油酸(C18:1 trans-9)及其他脂肪酸的定性與定量分析。
核心檢測(cè)方法氣相色譜法(GC):采用毛細(xì)管色譜柱分離脂肪酸甲酯,氫火焰離子化檢測(cè)器(FID)檢測(cè)。
檢出限與定量限反油酸檢出限(LOD)為0.05 mg/kg,定量限(LOQ)為0.2 mg/kg,具體依樣品基質(zhì)調(diào)整。
質(zhì)控樣品要求需使用空白樣品、加標(biāo)回收率樣品(加標(biāo)濃度0.1-10 mg/kg)及標(biāo)準(zhǔn)物質(zhì)進(jìn)行平行實(shí)驗(yàn),回收率范圍應(yīng)控制在80%-120%。
關(guān)鍵實(shí)驗(yàn)步驟1. 樣品脂肪提取;2. 脂肪酸甲酯化(三氟化硼-甲醇法);3. 氣相色譜分析(程序升溫,載氣為氮?dú)猓?. 峰面積歸一化法定量。
特別說(shuō)明反油酸甲酯易氧化,需避光保存;若樣品中反式脂肪酸含量低,建議采用硅膠柱凈化減少干擾。
國(guó)家標(biāo)準(zhǔn)解讀:《食品安全國(guó)家標(biāo)準(zhǔn) 食品中反式脂肪酸的測(cè)定》
標(biāo)準(zhǔn)名稱及標(biāo)準(zhǔn)號(hào)GB 5009.257-2016《食品安全國(guó)家標(biāo)準(zhǔn) 食品中反式脂肪酸的測(cè)定》
適用范圍專門用于食品中反式脂肪酸(含反油酸)的測(cè)定,包括油脂、烘焙食品、乳制品等。
核心檢測(cè)方法銀離子固相萃取結(jié)合氣相色譜法:通過(guò)Ag?硅膠柱分離反式脂肪酸甲酯,提高檢測(cè)特異性。
檢出限與定量限反式脂肪酸總量LOD為0.1 g/100g脂肪,LOQ為0.3 g/100g脂肪。
質(zhì)控樣品要求每批次需檢測(cè)至少1個(gè)質(zhì)控樣(已知反式脂肪酸含量的標(biāo)準(zhǔn)物質(zhì)),相對(duì)偏差需≤10%。
關(guān)鍵實(shí)驗(yàn)步驟1. 甲酯化;2. 銀離子柱凈化;3. 氣相色譜分析(建議使用CP-Sil 88色譜柱);4. 反式脂肪酸比例計(jì)算。
特別說(shuō)明需注意色譜柱極性與升溫程序優(yōu)化,以區(qū)分順式與反式異構(gòu)體;銀離子柱需定期活化。
相關(guān)行業(yè)標(biāo)準(zhǔn):SN/T 2926-2011《出口食品中反式脂肪酸的測(cè)定》
標(biāo)準(zhǔn)名稱及標(biāo)準(zhǔn)號(hào)SN/T 2926-2011《出口食品中反式脂肪酸的測(cè)定》
適用范圍適用于出口食品中反式脂肪酸的檢測(cè),涵蓋動(dòng)植物油脂、乳制品等,強(qiáng)調(diào)痕量分析。
核心檢測(cè)方法氣相色譜-質(zhì)譜聯(lián)用法(GC-MS):結(jié)合保留時(shí)間與特征離子峰進(jìn)行雙重定性。
檢出限與定量限反油酸LOD為0.02 mg/kg,LOQ為0.06 mg/kg,靈敏度高于國(guó)標(biāo)方法。
質(zhì)控樣品要求每20個(gè)樣品需插入1個(gè)加標(biāo)樣品,并監(jiān)控內(nèi)標(biāo)物(如C17:0甲酯)的響應(yīng)穩(wěn)定性。
關(guān)鍵實(shí)驗(yàn)步驟1. 快速甲酯化(硫酸-甲醇法);2. 低溫濃縮;3. GC-MS選擇離子監(jiān)測(cè)(SIM)模式分析。
特別說(shuō)明適用于復(fù)雜基質(zhì)樣品,但需注意質(zhì)譜離子源的定期清洗以防止污染。

以上信息僅供參考,請(qǐng)以相應(yīng)標(biāo)準(zhǔn)的原文為準(zhǔn)!

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