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Stability of fatty acid composition in seal blubber during long-term storage

机译：密封脂中脂肪酸成分的长期储存稳定性

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摘要

This study was performed to evaluate the stability of the fatty acid (FA) composition of blubber from Baltic grey seals Halichoerus grypus archived at -25℃ in the Swedish Environmental Specimen Bank (SESB). Possible alterations of FA compositions with storage time and temperature were evaluated. Blubber from 5 seals was kept at + 2℃ and at -20℃ and sampled for up to 6 mo and 33 mo, respectively. Furthermore, FA profile stability was evaluated in blubber stored in the SESB for 4 and 6 yr. This was done by re-sampling and re-analyzing blubber samples from SESB. In both parts of the study, a principal component analysis was performed on 48 FAs comprising 98 to 99 % of the total FAs in blubber of Baltic grey seals. We found no indication of a critically altered FA composition, neither in blubber stored at + 2℃ for 6 mo nor in blubber stored at -20℃ for 33 mo. The re-analysis of samples stored in SESB for ~4 to 6 yr only differed for a few FAs in some samples. The most remarkable differences were a slight increase in some long-chain unsaturated FAs (18:2n-6, 20:3n-3, 20:4n-3, 22:4n-3). As an increase in long-chain polyunsatu-rated FAs due to storage is highly unlikely, we believe that this is probably more due to the sampling technique than to a critically altered FA composition due to storage. Our results suggest that archived seal blubber may be safely used in retrospective analyses of diet using an FA signature analysis technique.
机译：本研究旨在评估瑞典环境标本库（SESB）在-25℃下封存的波罗的海灰海豹Halichoerus grypus的脂肪酸（FA）成分的稳定性。评估了FA成分随储存时间和温度的可能变化。将来自5个密封件的缓冲剂分别保持在+ 2℃和-20℃的温度下，分别采样至6 mo和33 mo。此外，在SESB中储存4年和6年的润滑脂中评估了FA轮廓稳定性。这是通过对SESB的润滑脂样品进行重新采样和重新分析来完成的。在研究的两个部分中，都对48种FA进行了主成分分析，这些FA占波罗的海灰海豹的脂中总FA的98％至99％。我们发现没有迹象表明FA组成发生了重大变化，既没有在+ 2℃下储存6个月的润滑脂，也没有在-20℃下储存33 mo的润滑脂。 SESB中存储约4至6年的样品的重新分析仅在某些样品中的几个FA上有所不同。最显着的差异是一些长链不饱和脂肪酸的含量略有增加（18：2n-6、20：3n-3、20：4n-3、22：4n-3）。由于存储引起的长链多不饱和FA的增加极不可能，因此我们认为，这可能更多是由于采样技术的缘故，而不是由于存储导致​​FA组成发生了重大变化。我们的研究结果表明，使用FA特征分析技术对饮食进行回顾性分析可以安全地使用封存的密封脂。

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  • 来源
    《Marine ecology progress series》 |2012年第8期|p.283-291|共9页
  • 作者

    Ylva Lind; Britt-Marie Baecklin; Karl Lundstroem; Suzanne M. Budge; Michael Walton; Olle Karlsson;

  • 作者单位

    Department oi Contaminant Research, Swedish Museum of Natural History, PO Box 50007, 104 05 Stockholm, Sweden;

    Department oi Contaminant Research, Swedish Museum of Natural History, PO Box 50007, 104 05 Stockholm, Sweden;

    Department of Aquatic Resources, Swedish University of Agricultural Sciences, Turistgatan 5, 453 30 Lysekil, Sweden;

    Canadian Institute of Fisheries Technology, Dalhousie University, Halifax, Nova Scotia B3J 2X4, Canada;

    School of Biology, University of St Andrews, St Andrews KY16 8LB, UK;

    Department oi Contaminant Research, Swedish Museum of Natural History, PO Box 50007, 104 05 Stockholm, Sweden;

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  • 关键词

    fatty acid composition; long-term storage; blubber; grey seal; baltic sea;

    机译：脂肪酸组成;长期存放;大声哭;灰色印章;波罗的海;

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