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反油酸_112-79-8
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反油酸

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

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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国家标准解读:《食品安全国家标准 食品中脂肪酸的测定》
标准名称及标准号GB 5009.168-2016《食品安全国家标准 食品中脂肪酸的测定》
适用范围适用于食品(含油脂、乳制品等)中脂肪酸的测定,包括反油酸(C18:1 trans-9)及其他脂肪酸的定性与定量分析。
核心检测方法气相色谱法(GC):采用毛细管色谱柱分离脂肪酸甲酯,氢火焰离子化检测器(FID)检测。
检出限与定量限反油酸检出限(LOD)为0.05 mg/kg,定量限(LOQ)为0.2 mg/kg,具体依样品基质调整。
质控样品要求需使用空白样品、加标回收率样品(加标浓度0.1-10 mg/kg)及标准物质进行平行实验,回收率范围应控制在80%-120%。
关键实验步骤1. 样品脂肪提取;2. 脂肪酸甲酯化(三氟化硼-甲醇法);3. 气相色谱分析(程序升温,载气为氮气);4. 峰面积归一化法定量。
特别说明反油酸甲酯易氧化,需避光保存;若样品中反式脂肪酸含量低,建议采用硅胶柱净化减少干扰。
国家标准解读:《食品安全国家标准 食品中反式脂肪酸的测定》
标准名称及标准号GB 5009.257-2016《食品安全国家标准 食品中反式脂肪酸的测定》
适用范围专门用于食品中反式脂肪酸(含反油酸)的测定,包括油脂、烘焙食品、乳制品等。
核心检测方法银离子固相萃取结合气相色谱法:通过Ag⁺硅胶柱分离反式脂肪酸甲酯,提高检测特异性。
检出限与定量限反式脂肪酸总量LOD为0.1 g/100g脂肪,LOQ为0.3 g/100g脂肪。
质控样品要求每批次需检测至少1个质控样(已知反式脂肪酸含量的标准物质),相对偏差需≤10%。
关键实验步骤1. 甲酯化;2. 银离子柱净化;3. 气相色谱分析(建议使用CP-Sil 88色谱柱);4. 反式脂肪酸比例计算。
特别说明需注意色谱柱极性与升温程序优化,以区分顺式与反式异构体;银离子柱需定期活化。
相关行业标准:SN/T 2926-2011《出口食品中反式脂肪酸的测定》
标准名称及标准号SN/T 2926-2011《出口食品中反式脂肪酸的测定》
适用范围适用于出口食品中反式脂肪酸的检测,涵盖动植物油脂、乳制品等,强调痕量分析。
核心检测方法气相色谱-质谱联用法(GC-MS):结合保留时间与特征离子峰进行双重定性。
检出限与定量限反油酸LOD为0.02 mg/kg,LOQ为0.06 mg/kg,灵敏度高于国标方法。
质控样品要求每20个样品需插入1个加标样品,并监控内标物(如C17:0甲酯)的响应稳定性。
关键实验步骤1. 快速甲酯化(硫酸-甲醇法);2. 低温浓缩;3. GC-MS选择离子监测(SIM)模式分析。
特别说明适用于复杂基质样品,但需注意质谱离子源的定期清洗以防止污染。

以上信息仅供参考,请以相应标准的原文为准!