超高压辅助提取对提取溶剂物理特性的影响

以超高压辅助提取蓝莓果渣花色苷为研究对象,从超高压处理对提取溶剂物理性质影响角度对超高压辅助提取机理进行研究。结果表明超高压辅助提取过程会影响提取溶剂的最大吸收波长、pH值、电导率等物理性质;通过氢谱核磁共振谱和红外光谱测定发现超高压处理会影响醇水之间氢键,随着提取压力增加,醇水之间氢键更加稳定,其中花色苷提取率和醇水氢键羟基红外吸收、醇水氢键化学位移具有显著相关性。从提取溶剂角度考虑,超高压处理能够增加花色苷提取率是由于压力引起提取溶剂分子间氢键的变化,进而导致提取溶剂物理性质发生变化,从而提高花色苷提取率。

High Hydrostatic Pressure Enhances the Extraction of Anthocyanins from Blueberry Pomace by Changing Physical Properties of the Extraction Solvent

The high hydrostatic pressure extraction of anthocyanins from blueberry pomace was investigated with a focus on the mechanism by which high hydrostatic pressure (HHP) enhances the extraction of anthocyanins by affecting physical properties of the extraction solvent (a mixture of 37% HCl and 66% ethanol (1:99, V/V)). The results showed that HHP processing could affect physical properties of the extraction solvent including maximum absorption wavelength, pH value, conductivity, infrared absorption and chemical shift caused by the intermolecular hydrogen bonding between ethanol and water. With increasing pressure, the hydrogen bonding between ethanol and water became more stable. A significant correlation was found between the extraction yield of anthocyanins and infrared absorption and chemical shift from the intermolecular hydrogen bonding. In conclusion, HHP treatment could the intermolecular hydrogen bonding and therefore physical properties of the extraction solvent, leading to increased extraction yield of anthocyanins from blueberry pomace.