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Underside information on PD-CAAS and DIAAS, two seemingly simple protein quality criteria

机译:有关PD-CAA和DIAA的缺点信息,两个看似简单的蛋白质质量标准

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PD-CAAS and DIAAS are indexes that simply reflect protein quality based on protein digestibility and the amino acid composition of the protein relatively to a reference composition. The calculation of these scores raises critical points, among which the amino acid pattern of the reference protein depending on the age range. Moreover, the factor 6.25 used to convert nitrogen to protein to quantify the protein amount in the protein ingredient generally overestimates the protein content, resulting in an underestimation of quality scores. Additionally, using free or "in-chain'' molecular weight to estimate amino acids content affects significantly the score. Hence, it is important to clearly specify theses parameters in the studies. Lastly, the model used to determine digestibility (Human, pig, rat) as well as the methodology (ileal vs fecal, assessment of endogenous losses vs isotopic tracers) lead to variability. This must be carefully considered in the understanding of the PD-CAAS and DIAAS and the comparison between protein sources. (C) 2021 Societe francaise de nutrition. Published by Elsevier Masson SAS. All rights reserved.
机译:PD-CAAS和DIAAS是基于蛋白质消化率和蛋白质相对于参考成分的氨基酸组成简单反映蛋白质质量的指标。这些分数的计算提出了关键点,其中参考蛋白质的氨基酸模式取决于年龄范围。此外,用于将氮转化为蛋白质以量化蛋白质成分中蛋白质含量的系数6.25通常高估了蛋白质含量,导致对质量分数的低估。此外,使用游离或“链内”分子量估算氨基酸含量会显著影响评分。因此,在研究中明确指定这些参数非常重要。最后,用于确定消化率的模型(人、猪、大鼠)以及方法(回肠与粪便、内源性损失评估与同位素示踪物)导致变异。在理解PD-CAAS和DIAAS以及比较蛋白质来源时,必须仔细考虑这一点。(c)2021法国食品营养协会。由Elsevier Masson SAS出版。版权所有。

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