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| Solid phase extraction elimination of interference of sodium stearyl lactate on acid value determination by cupric-pyridine colorimetric method |
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| DOI： |
| KeyWord:acid value cupric-pyridine colorimetric method sodium stearyl lactate ion exclusion chromatography solid-phase extraction |
| FundProject:食品安全国家标准制修订项目（spaq-2020-40） |
| Author Name | Affiliation | | XUE Bin1,2, CAO Wenming3,4, TU Bingfang1 | 1.Welch Materials Inc. , Shanghai 201613, China； 2.Beilei (Shanghai) Biotechnology Co. , Ltd. ， Shanghai
201203, China
3.Shanghai Engineering Research Center for Food Rapid Detection, School of Medical Instrument
and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
4.Wilmar
(Shanghai) Biotechnology Research & Development Center Co. , Ltd. , Shanghai 200137, China |
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| Abstract: |
| To eliminate the positive interference of synthetic emulsifier sodium stearyl lactate (SSL) in the determination of acid value by cupric-pyridine colorimetric method,a solid-phase extraction (SPE) technique for cleaning SSL was developed. Using cyclohexane containing 2% isopropyl alcohol as mobile phase of SPE and oil sample solution, the content of SSL in oils before and after SPE was indirectly evaluated by detecting the content of free lactic acid released after saponification and hydrolysis of oils by ion exclusion chromatography. The effect of the established SPE technique on the removal of SSL from oils was evaluated by combining the acid value change measured by cupric-pyridine colorimetric method.The results showed that the SPE method could effectively remove SSL from oil, and obviously eliminate the interference of SSL on the determination of acid value by cupric-pyridine colorimetric method, without causing the loss of fatty acid content in oil samples.After purification by SPE, the interference of the acid value determination by cupric-pyridine colorimetric method is significantly reduced for the samples containing SSL edible oils. |
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