Preparation of High Strength Pectin Silica Composite Aerogel by Freeze Drying and Its Delivery of Anthocyanins
Silica aerogel is a new kind of mesoporous nanomaterial,which is widely used.In the food industry,aerogel is mainly used as a precursor for packaging,embedding and delivering active substances,and preparing of oil gel,which is mainly achieved through its adsorption properties.However,the silica aerogel structure is mainly composed of silicon skeleton,and its strength is low.Therefore,this study aimed to improve its performance by preparing composite aerogels.The results showed that by adding an appropriate amount of pectin,the porosity of the silica aerogel(with 10％pectin)could reach up to 95.3％.The thermal stability of the composite aerogel was improved by compounding with SiO2.The compression test results showed that the deformation of aerogel with 12.5％pectin addition was only 80.6％under 100 g pressure,which confirmed that pectin could effectively regulate the strength of aerogel.Adsorption experiments have shown that the addition of pectin enhances the adsorption of water vapor,while the adsorption of corn oil weakens and the oil holding capacity increases.Finally,anthocyanins have been used as a model to establish the delivery system of compound aerogels for nutrients.Compound aerogels have significant effects on the controlled release of anthocyanins and can better help nutrients digestion.This study provides a theoretical basis for the further application of composite aerogels in the food industry.
万方数据
维普
