亚铁离子螯合肽的结构特征对铁螯合肽的形成有重要影响，不同的多肽中氨基酸组成和结构不同，导致铁离子的螯合位置不一。多肽的螯合能力与其相对分子质量大小有着紧密地关系。植物蛋白水解后，相对分子质量小于1000的有着更高的金属螯合活性。随着多肽分子量的减少，螯合率从８%显著提高到34%，表明与大相对分子质量的多肽相比，低相对分子质量的多肽具有更高的螯合活性。大麦谷蛋白用碱性蛋白水解后发现，相对分子质量小于1000的肽段具有更高的亚铁离子结合能力。紫外吸收光谱可用于研究多肽的结构变化。肽与金属离子发生螯合后，电子跃迁时需要的能量会发生改变，导致吸收波长和吸收峰发生变化，因此可以利用紫外光谱初步分析确定螯合物的形成。有机配体与过渡金属离子络合物的形成，可能导致原有吸收峰的转移、消失或新吸收峰的出现。通过紫外光谱图进行对比，发现最大吸收峰发生了红移，表明酰胺键上的氮原子可能参与了亚铁螯合物的形成。螯合后出现特征吸收峰转移或消失，证明该样品与铁形成络合物。

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抗坏血酸亚铁Ferrous Ascorbate、赖氨酸甘氨酸镁Magnesium Lysinate Glycinate、甘氨酸谷氨酰胺镁Magnesium Glycinate Glutamine、柠檬酸苹果酸镁Magnesium Citrate Malate、柠檬酸锶Strontium Citrate、柠檬酸锰Manganese Citrate、柠檬酸铜Copper Citrate、天门冬氨酸锂Lithium Aspartate、抗坏血酸锰Manganese Ascorbate、牛磺酸硒Selenium Taurate。

The key factors influencing the chelating ability of polypeptides to ferrous

The structure of ferrous chelate peptides has an important effect on the formation of iron chelate peptides. The amino acid composition and structure of different peptides are different, resulting in different chelate positions of iron ions. The chelating ability of polypeptide is closely related to its relative molecular weight. After hydrolysis of plant protein, the relative molecular weight of plant protein was less than 1000, and the metal chelation activity was higher. As the molecular weight of the peptides decreased, the chelation rate increased significantly from 8% to 34%, indicating that the peptides with low molecular weight had higher chelation activity than those with large molecular weight. The peptides with molecular weight less than 1000 were found to have higher ferrous binding ability after hydrolysis of barley gluten with basic protein. Ultraviolet absorption spectroscopy can be used to study the structural changes of polypeptides. After the peptide chelates with metal ions, the energy required for electron transition will change, resulting in changes in absorption wavelength and absorption peak, so the formation of chelates can be determined by preliminary analysis of ultraviolet spectrum. The formation of complex between organic ligands and transition metal ions may lead to the transfer or disappearance of the original absorption peak or the emergence of a new absorption peak. It is found that the maximum absorption peak is redshifted by UV spectrogram, which indicates that the nitrogen atom on the amide bond may participate in the formation of ferrous chelates. After chelation, the characteristic absorption peak shifted or disappeared, which proved that the sample formed a complex with iron.

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Ferrous Ascorbate, Magnesium Lysinate Glycinate, Magnesium lysinate Glycinate Glutamine, Magnesium citrate malate Citrate Malate, Strontium Citrate, Manganese Citrate, Copper Citrate, Lithium Aspartate, Manganese ascorbate Ascorbate, Selenium Taurate.