title: Nutrient composition and starch characteristics of Quercus glandulifera Bl. seeds from China.
abstract: The chemical composition and starch characteristics of acorn (Quercus glandulifera Bl.) were studied. The moisture content of acorn seeds was 7.55%. The crude fat, crude protein, dietary fiber, total ash, and nitrogen-free extract contents of acorn seed were 4.20%, 10.16%, 2.95%, 0.03%, and 82.66%, respectively, on a dry weight basis. Linoleic, oleic, and palmitic were the most predominant fatty acids. UFA:SFA and SFA:MUFA:PUFA ratios were 2.6:1 and 1.25:1.34:1, respectively. The essential amino acid content from acorn seeds was low based on FAO reference values. Acorn seeds were a good source of Fe, Zn, and Mn. The contents of vitamins A and E were 1.40 mg RE/100g and 10.78 mg/100 g, respectively. Starch extracted from acorn seeds had round, triangle, and elliptical morphology with granule size of 3.3-126.2 μm. The ratio between amylose and amylopectin contents was 25.39:72.94. Acorn starch had a typical A-type crystal pattern with 23.53% relative crystallinity. The gelatinization temperature was 66.53 °C and the transition enthalpy was 4.33 J/g.
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China.
authors.forename: Songnan
authors.initials: S
authors.lastname: Li
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China. Electronic address: zhouyibin@ahau.edu.cn.
authors.forename: Yibin
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China.
authors.forename: Mei
authors.initials: M
authors.lastname: Liu
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China.
authors.forename: Shengnan
authors.initials: S
authors.lastname: Cao
mesh_terms: D002681:China; D005227:Fatty Acids / Q000032:analysis; D010316:Particle Size; D029963:Quercus / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry; D013213:Starch / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D005227:Fatty Acids; D013213:Starch
keywords: Acorn; Nutrient composition; Quercus glandulifera Bl. seeds; Starch characteristics