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The chemical quality of frozen Vietnamese Pangasius hypophthalmus fillets

机译：冷冻越南番石榴片的化学品质

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The aim of the present study was to evaluate the chemical quality parameters regarding frozen Pangasius hypophthalmus specimens from Vietnam. The proximate composition, pH, ammonia, biogenic amines (BAs), total mercury (Hg), malondialdehyde (MDA), and polyphosphate were determined. The moisture, protein, lipid and ash values were between 83.83–85.59, 12.51–14.52, 1.09–1.65, and 0.76–2.38 g 100 g−1, respectively. Fraud by excessive polyphosphate addition was detected in 30% of the samples whereas Hg above the recommended limit was observed in 50% of the samples. With regard to compounds from the degradation process, low concentrations of individual BAs and pH values were found in this study and ranged from 5.88 to 6.18, except for samples with polyphosphate >1 g 100−1 (pH > 7.00) were observed in the present study. However, ammonia concentration indicated that a degradation process initiated in 80% of the samples (0.12–0.34 NH 3 g−1) and 20% of the samples (1.87–1.94 μg NH 3 g−1) were in an advanced deterioration process. Furthermore, MDA values (1.21–7.88 mg kg−1) suggested some failures, mainly during transportation and/or storage. We concluded that quality control measures must be implemented on the Pangasius production chain to improve the quality of products provided to consumers worldwide.
机译：本研究的目的是评估越南冷冻的Pangasius hypophthalmus标本的化学质量参数。确定了最接近的成分，pH，氨，生物胺（BAs），总汞（Hg），丙二醛（MDA）和多磷酸盐。水分，蛋白质，脂质和灰分分别在83.83-85.59、12.51-14.52、1.09-1.65和0.76-2.38 g 100 g -1 之间。在30％的样品中发现了过量添加多磷酸盐而造成的欺诈，而在50％的样品中发现汞含量超过建议的限值。关于降解过程中的化合物，本研究中发现低浓度的单个BA和pH值范围为5.88至6.18，但多磷酸盐> 1 g 100 -1 （pH 7.00）在本研究中观察到。但是，氨浓度表明降解过程在80％的样品（0.12-0.34 NH 3 g -1 ）和20％的样品（1.87-1.94μgNH 3 g -1 ）处于恶化阶段。此外，MDA值（1.21-7.88 mg kg -1 ）提示了一些故障，主要是在运输和/或存储期间。我们得出结论，必须在Pangasius生产链上实施质量控制措施，以提高向全球消费者提供的产品的质量。

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