title: Antioxidant activity and in vitro digestibility of dialdehyde starches as influenced by their physical and structural properties.
abstract: Dialdehyde starches (DASs) with different aldehyde contents were prepared by periodate oxidation of corn starch, and their antioxidant activity and digestibility were studied and related to their structural characteristics, including morphology, relative crystallinity, average molecular weights, swelling power and solubility. The results revealed that DASs were effective antioxidants as revealed by the 2,2'-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity. A significant positive correlation (r>0.959, p<0.01) was found between the antioxidant effect and the aldehyde contents of DASs at all concentrations. The oxidation of starch increased the rapidly digestible starch (RDS) and resistant starch (RS) contents but reduced the amount of slowly digestible starch (SDS). Correlation analysis indicated that the amounts of RDS and RS were positively correlated to the aldehyde contents of DASs (r=0.973, p<0.01, and r=0.900, p<0.01), whilst the amount of SDS was negatively correlated to the aldehyde contents (r=-0.960, p<0.01). The structural characteristic also plays an important role for the antioxidant activity and digestibility of DASs.
authors.affiliation: Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, PR China. Electronic address: zhanglmd@126.com.
authors.forename: Liming
authors.initials: L
authors.lastname: Zhang
authors.forename: Shuang
authors.initials: S
authors.lastname: Zhang
authors.forename: Feng
authors.initials: F
authors.lastname: Dong
authors.forename: Wentian
authors.initials: W
authors.lastname: Cai
authors.forename: Jing
authors.initials: J
authors.lastname: Shan
authors.forename: Xiaobian
authors.initials: X
authors.lastname: Zhang
authors.forename: Shuli
authors.initials: S
authors.lastname: Man
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000378:metabolism*; D004063:Digestion; D006801:Humans; D008954:Models, Biological; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000737:chemistry* / Q000378:metabolism*; D013213:Starch / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D003313:Zea mays / Q000737:chemistry / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D013213:Starch; C012880:dialdehyde starch
keywords: Antioxidant activity; Corn starch; Dialdehyde starch; Digestibility