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Changes to amino acid composition of bloodmeal after chemical oxidation

机译:化学氧化后血粉氨基酸组成的变化

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Bovine-derived bloodmeal can be decoloured using peracetic acid, extruded and injection moulded into a yellow translucent bioplastic. This plastic has different properties to extruded and injection moulded bloodmeal, in that it does not require sodium sulfite or urea to be extrudable. The effect of oxidation on the physical and chemical characteristics of the proteins during bloodmeal decolouring with PAA was studied by assessing changes in the amino acid profile. Polymer interactions, hydrophilicity and the destruction of cysteine crosslinks were measured indirectly by assessing protein solubility, molecular weight distribution and by synchrotron FT-IR analysis. Increasing peracetic acid concentration resulted in an increased loss of iron due to destruction of the porphyrin groups, increased solubility due to destruction or conversion of aromatic amino acids into hydrophilic groups, destruction of lysine, reduced protein content due to increased salt content in the final product, and a larger amount of smaller protein peptides but with a similar average molecular weight to bloodmeal. Amino acid analysis showed an increase in cysteine content in the product, FT-IR of the sulfur groups revealed that these were heavily oxidised, such that some would be unable to participate in disulfide bonds thereby increasing protein solubility.
机译:牛血粉可以用过氧乙酸脱色,挤出并注塑成黄色半透明的生物塑料。这种塑料与挤压和注射成型的血粉具有不同的特性,因为它不需要亚硫酸钠或尿素即可挤压。通过评估氨基酸谱的变化,研究了氧化对PAA对血粉脱色过程中蛋白质的物理和化学特性的影响。聚合物相互作用,亲水性和半胱氨酸交联的破坏可通过评估蛋白质溶解度,分子量分布和同步加速器FT-IR分析间接测量。过氧乙酸浓度的增加由于卟啉基团的破坏而导致铁的损失增加,由于芳香族氨基酸的破坏或转化为亲水基团而导致的溶解度增加,赖氨酸的破坏,由于最终产物中盐含量的增加而降低了蛋白质含量,以及大量较小的蛋白质肽,但平均分子量与血粉相似。氨基酸分析显示产物中半胱氨酸含量增加,硫基团的FT-IR显示它们被严重氧化,因此有些基团无法参与二硫键,从而增加了蛋白质的溶解度。

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