Preparation of esterified microporous corn starch and its adsorption property of lycopene

In order to improve the storage stability of lycopene,firstly corn starch as raw material,octenyl succinate anhydride as esterifying agent and α-amylase as enzymatic hydrolysis agent to prepare esterified microporous starch. The esterified microporous starch of degrees of substitution and degree of hydrolysis was determined.The characterization of esterified microporous starch was carried out by FT-IR spectra and scanning electron microscopy. The influence of the adsorption time,adsorption temperature and adsorption concentration on the esterified microporous starch adsorption of lycopene were studied. The stability of adsorbed lycopene by esterified microporous starch under natural light,ultraviolet light,differing temperatures and oxygen was tested.The esterified microporous starch with substitution degree 0.0227 and degree of hydrolysis 0.46 was characterized by FT-IR spectra and scanning electron microscopy,the results showed the ester group was introduced and had a good opening performance. The single factor test showed that the better adsorption concentration,adsorption time,adsorption temperature were 10 μg/m L,30 min,45 ℃. The saturated adsorption amount of lycopene by esterified microporous starch was 225.45 μg/g. Compared with native starch,the adsorption ability and adsorption stability of the esterified microporous starch to lycopene had improved significantly,and the adsorption stability was also improved. So the esterified microporous starch could be used for the preservation of the lycopene.