Normal-Phase HPLC-ELSD to Compare Lipid Profiles of Different Wheat Flours.

Normal-Phase HPLC-ELSD to Compare Lipid Profiles of Different Wheat Flours.
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正相HPLC-ELSD法比较不同小麦粉的脂质谱

DOI:
10.3390/foods10020428
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发表时间:
2021-02-16
期刊:
Foods (Basel, Switzerland)
影响因子:
--
通讯作者:
Delcour JA
Delcour JA
中科院分区:
其他
文献类型:
--
作者:
Melis S;Foubert I;Delcour JA

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正相高效液相色谱(HPLC)与蒸发光散射检测(ELSD)结合被广泛用于分离和检测各种食品样品中的脂质。评价了不同脂质的ELSD响应,以阐明与通过HPLC-ELSD定量相关的可能性和挑战。不仅极性官能团的数量和类型,而且(游离或酯化)脂肪酸(FA)的链长和不饱和度对ELSD响应有显着影响。三棕榈酸甘油酯和三亚油酸甘油酯产生了显着不同的ELSD响应,即使它们构成的游离脂肪酸产生相同的反应。因此,FA结构如何影响游离FA的ELSD响应并不能预测三酰甘油和可能含有酯化FA的其他脂质的ELSD响应。由于脂质的ELSD响应取决于其所含的(酯化)FA的特性,因此使用HPLC-ELSD进行完全准确的脂质定量具有挑战性且耗时。尽管如此,HPLC-ELSD是一种良好且快速的技术,可以半定量比较具有可比FA组成的样品之间不同脂质类别的水平。以这种方式,可以比较来自近等基因小麦品系的不同面粉的脂质谱。
Normal-phase high-performance liquid chromatography (HPLC) is widely used in combination with evaporative light scattering detection (ELSD) for separating and detecting lipids in various food samples. ELSD responses of different lipids were evaluated to elucidate the possibilities and challenges associated with quantification by means of HPLC-ELSD. Not only the number and type of polar functional groups but also the chain length and degree of unsaturation of (free or esterified) fatty acids (FAs) had a significant effect on ELSD responses. Tripalmitin and trilinolein yielded notably different ELSD responses, even if their constituting free FAs produced identical responses. How FA structure impacts ELSD responses of free FAs is thus not predictive for those of triacylglycerols and presumably other lipids containing esterified FAs. Because ELSD responses of lipids depend on the identity of the (esterified) FA(s) which they contain, fully accurate lipid quantification with HPLC-ELSD is challenging and time-consuming. Nonetheless, HPLC-ELSD is a good and fast technique to semi-quantitatively compare the levels of different lipid classes between samples of comparable FA composition. In this way, lipid profiles of different flours from near-isogenic wheat lines could be compared.
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