> Problem statement: The present study aimed to study the evolution of fatty acid content, focusing on rumenic acid content, from raw milk to yoghurt processed from this milk. Approach: Milk samples were collected in a dairy plant in the northwest of Parana State weekly in January 2011 (Brazilian summer). It processed one truck load of 26,000 L of refrigerated type-C (whole standardized milk with a minimum of 3% fat) milk per day, mostly from the city of Lobato, Parana, produced mainly by Gir (Bos indicus) cattle raised on stargrass (Cynodon nlenfuensis var. nlenfuensis) pasture. Results: Saturated Fatty Acid (SFA) were the most abundant, particularly palmitic (16:0), stearic (18:0) and myristic (14:0). Among the Monounsaturated Fatty Acid (MUFA), Polyunsaturated Fatty Acid (PUFA) and trans fatty acid, oleic acid (18:1n-9), linoleic acid (18:2n-6), elaidic acid (t9-18:1) and c9, t11-18:2 (rumenic acid) predominated. It was detected significant differences (p<0.05) in the quantification of isomer c9, t11-18:2 of Conjugated Linoleic Acid (CLA). Raw milk had the largest content of rumenic acid (14.91±0.17 mg g-1 of lipids), decreasing to 6.22±0.20 after pasteurization and to 5.41±0.18 mg g-1 in yoghurt. Conclusion/Recommendations: It is demonstrated that pasteurization and yoghurt making affect the CLA contents.
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机译： > 问题陈述：本研究旨在研究脂肪酸含量的变化，侧重于瘤胃酸含量，从原料牛奶到用这种牛奶加工的酸奶。 方法： 2011年1月（巴西夏季），每周在巴拉那州西北部的一家乳制品厂中收集牛奶样品。它每天处理一卡车装载的26,000升冷藏C型（全标准化牛奶，脂肪含量至少为3％）牛奶，主要来自巴拉那州的洛巴托市，主要由在star子上饲养的吉尔（Bos indicus）牛生产（Cynodon nlenfuensis var。nlenfuensis）牧场。 结果：饱和脂肪酸（SFA）含量最高，尤其是棕榈酸（16：0），硬脂酸（18：0）和肉豆蔻酸（14：0）。在单不饱和脂肪酸（MUFA），多不饱和脂肪酸（PUFA）和反式脂肪酸中，油酸（18：1n-9），亚油酸（18：2n-6），亚麻酸（t9-18：1）和c9，t11-18：2（瘤胃酸）占主导地位。检测到共轭亚油酸（CLA）的异构体c9，t11-18：2的定量存在显着差异（p <0.05）。生乳中的瘤胃酸含量最高（14.91±0.17 mg g -1 脂质），巴氏灭菌后降至6.22±0.20，巴氏杀菌后降至5.41±0.18 mg g -1 在酸奶中。 结论/建议：事实证明，巴氏灭菌法和酸奶制备会影响CLA含量。
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