Determination of Trans Fatty Acid Levels by FTIR in Processed Foods in Australia

以FTIR定量澳洲加工食品的反式脂肪酸含量

Justine McCarthy ； Daniel Barr ； Andrew Sinclair

《Asia Pacific Journal of Clinical Nutrition》 17卷3期 (2008/09) Pp. 391-396

https://doi.org/10.6133/apjcn.2008.17.3.05

摘要

全球各地衛生當局都呼籲“限制反式脂肪酸的攝取”。然而在澳洲，其反式脂肪酸(TFA)的含量未被要求明列於營養標示上，除非該食品有做關於脂肪酸或膽固醇的營養宣稱。由於澳洲加工食品中反式脂酸含量的資訊有限，因此，本研究主要目的是挑選一些曾被報導的反式脂酸來源的食物項目，來決定其反式脂酸的含量。挑出的92項食物中，都含植物油且總脂肪含量超過5%。這個準則是根據文獻回顧中，被提及含有高濃度反式脂肪酸的食物項目而歸納出來的。脂質使用溶劑淬取出來，以稱重法決定總脂肪含量。而反式脂肪酸是利用內反射傅立葉轉換紅外線光譜儀(ATR-FTIR)定量。在某些澳洲的食品裡發現含高量反式脂肪酸，且有高變異度。分析的樣本中，有13件每份含超過1 g 的反式脂肪酸，最高有達每份8.1 g。除了在營養標示指出含量低於訂定的低劑量外，在澳洲出售的食品標示無法指出反式脂肪酸的含量。我們建議衛生當局應尋求方法幫助消費者能夠限制其反式脂肪酸的攝取量。

關鍵字

反式脂肪酸 ； 內反射傅立葉轉換紅外線光譜儀分析 ； 澳紐食品科學所 ； 澳洲食品

並列摘要

Health authorities around the world advise 'limiting consumption of trans fatty acids', however in Australia the trans fatty acid (TFA) content is not required to be listed in the nutrition information panel unless a declaration or nutrient claim is made about fatty acids or cholesterol. Since there is limited knowledge about trans fatty acid levels in processed foods available in Australia, this study aimed to determine the levels of TFA in selected food items known to be sources of TFA from previously published studies. Food items (n=92) that contain vegetable oil and a total fat content greater than 5% were included. This criterion was used in conjunction with a review of similar studies where food items were found to contain high levels of trans fatty acids. Lipids were extracted using solvents. Gravimetric methods were used to determine total fat content and trans fatty acid levels were quantified by Attenuated Total Reflectance Fourier Transform Infrared spectroscopy. High levels of trans fatty acids were found in certain items in the Australian food supply, with a high degree of variability. Of the samples analysed, 13 contained greater than 1 g of trans fatty acids per serving size, the highest value was 8.1 g/serving. Apart from when the nutrition information panel states that the content is less than a designated low level, food labels sold in Australia do not indicate trans fatty acid levels. We suggested that health authorities seek ways to assist consumers to limit their intakes of trans fatty acids.

並列關鍵字

trans fatty acids ； levels in foods ； ATR-FTIR analysis ； FSANZ ； Australian foods