煙草中石油醚提取物測定方法改進(jìn)
Improvement on Total Petroleum Ether Extract Content Determination in Tobacco
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摘要: 為提高煙草石油醚提取物含量的測定速度,，進(jìn)行了標(biāo)準(zhǔn)(YC/T 176-2003)測定方法的改進(jìn)試驗(yàn)：①增加煙樣浸泡過夜預(yù)處理步驟,；②稱量介質(zhì)由索氏提取器的接收瓶改為濾紙筒,。試驗(yàn)結(jié)果表明，①增加煙樣浸泡過夜預(yù)處理后,，樣品的提取時間縮短2 h,；②采用稱量索氏提取器接收瓶計量，一套提取裝置一次僅能提取1 個樣品,，改為稱量濾紙筒計量后,，一套提取裝置一次可提取12 個樣品，顯著減少了提取設(shè)備,、石油醚用量,、電耗和水耗；③改進(jìn)法的RSD 小于或略大于1.0%,；④改進(jìn)法與標(biāo)準(zhǔn)法測定結(jié)果的相對偏差小于2.2%,。該法適合煙草石油醚提取物的快速測定。Abstract: In order to quickly determine the content of total petroleum ether extract in tobacco, the standard method was improved, such as dipping the tobacco sample overnight, and adopting sieve papers canister instead of Soxhlet extractor in weighing. Results showed that the extract time was shortened by 2 hours after dipping the tobacco sample overnight. After adopting sieve papers canister, 12 samples were extracted once in a set of equipment, thus the new method could evidently save extract equipment, reduce the use of petroleum ether and the consumption of electricity and water, and accelerate determination speed. The relative standard deviation(RSD) of the improved method was below or slightly over 1.0%. The method was adequate for quick determination of total petroleum ether extract contents in tobacco.
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