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魚肉組織中氧化三甲胺含量之快速定量法

A Quick Method for the Determination of Trimethylamine Oxide in Fish Tissue

摘要


氧化三甲胺爲魚介類在生物及食品化學上之重要成份之一。歷來其定量方法繁雜而費時,且檢出濃度亦受到限制。經研究結果發現一新化學定量法,能迅速而正確的測出試料中的氧化三甲胺含量。其法爲:將魚肉均質物以三氯化醋酸攪拌抽出10分鐘,取其濾液3容積加1容積的0.3%一品紅:6%NaHSO3:4NH2SO4(2:1:2)發色劑,在密閉管內以100℃的水浴上加熱10分後急冷,再測定580nm波長之吸光度,從標準檢量線上,求得氧化三甲胺的含量。實驗結果獲知:氧化三甲胺在本試驗條件下在100℃加熱10分鐘卽完全分解爲甲醛,甲醛再與還元型一品紅反應在580nm波長處呈現吸收尖峯此爲本定量法之基本原理。因三氯化醋酸濃度,加熱時間及發色劑的比例及濃度對定量値有極大的影響,故其條件必須固定。魚肉中共同存在的甲醛因與發色劑在100℃加熱10分鐘時生成的色素已不復存在,故不影響本定时法,魚肉的分解產物亦不使發色値升高,故本法適於定量不同鮮度魚介類的氧化三甲胺含量之用。魚肉中氧化三甲胺以5%最終濃度的三氯化醋酸一次攪拌抽出10分鐘其抽出率卽已達90%以上。本定量法在20~30分鐘內卽可完成,其最低檢出濃度爲0.002mg/mlTMAO-N。

關鍵字

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並列摘要


A rapid and reliable method for determining TMAO content in fish tissue based on colorimetry was developed. Fish homogenates were extracted with 5% TCA solution in a magnetic stirrer for 10 min. then filtered. Three volumes of filtrate were mixed with one volume of reagent (0.3% Fuchsin: 6% NaHSO3:4N H2SO4=2:1:2) in a sealed tube. The tube was heated in a boiling water bath for extactly 10 min. and then cooled. The absorbance of the resulted pigment at 580 nm was then measured. TMAO content was calculated from a standard curve by dissolving the different concentration of authentic TMAO in 5% TCA and treated as mentioned above. The experiment can be finished within 20 to 30 min. with a detectable limit of 0.002 mg/ml of TMAO-N.

並列關鍵字

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