期刊
JOURNAL OF DIETARY SUPPLEMENTS
卷 18, 期 4, 页码 351-371出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/19390211.2020.1770394
关键词
Argentometric liquid chromatography (Ag plus -HPLC); conjugated fatty acids; conjugated linolenic acids; GC-MS; pomegranate seed oil; punicic acid
The quality of online-purchased PSO samples varies, with some samples at risk of oxidative deterioration. Consumers should be cautious in their purchases. Argentometric liquid chromatography is an effective tool for screening dietary supplements and ensuring product quality.
The number of online-purchased dietary supplements of diversified origin is exponentially increasing. Pomegranate seed oils (PSOs)-the main dietary source of conjugated linolenic acids (CLnA)-are available as dietary supplements via the Internet. PSO samples (n = 24) were purchased from Internet shops in Poland and China. Chromatographic techniques (gas chromatography coupled with mass spectroscopy [GC-MS] for fatty acids [FAs], liquid chromatography with fluorescence detection for tocopherols, and high-performance liquid chromatography with photodiode array detection for conjugated FAs) were used. The GC-MS method enabled the quantification of 45 FAs, which indicates its superiority to previously used methods. Argentometric liquid chromatography with pre-column mild alkaline hydrolysis for analysis of structural isomers of CLnA does not need preliminary derivatization into volatile compounds, which ensures the absence of artifacts and enables the analysis of the entire conjugated FA profile. PSO differed with tocopherols and FA profile. Some PSOs contained negligible amounts of CLnA, and because of that they did not meet the criteria of valuable, unadulterated nutraceuticals. Obtained results indicate that online purchased PSO shipped from distant places of origin could have been stored in inadequate conditions (temperature, humidity), which caused i.a. deterioration of oxidative quality. Unregulated online availability of dietary supplements of low oxidative quality and nutritive value as well as their intake may be a risk rather than a benefit for consumers. Argentometric liquid chromatography can be a simple, selective, and sensitive tool for screening of dietary supplements containing conjugated FAs and should be considered as an essential way of quality assurance.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据