title: Optimization of extraction process by response surface methodology and preliminary structural analysis of polysaccharides from defatted peanut (Arachis hypogaea) cakes.
abstract: In this work, response surface methodology was used to determine optimum conditions for extraction of polysaccharides from defatted peanut cake. A central composite design including independent variables, such as extraction temperature (x(1)), extraction time (x(2)), and ethanol concentration (x(3)) was used. Selected response which evaluates the extraction process was polysaccharide yield, and the second-order model obtained for polysaccharide yield revealed coefficient of determination of 97.81%. The independent variable with the largest effect on response was ethanol concentration (x(3)). The optimum extraction conditions were found to be extraction temperature 48.7°C, extraction time 1.52 h, and ethanol concentration of 61.9% (v/v), respectively. Under these conditions, the extraction efficiency of polysaccharide can increase to 25.89%. The results of structural analysis showed that the main composition of defatted peanut cake polysaccharide was α-galactose.
authors.affiliation: College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Song
authors.forename: Bingjian
authors.initials: B
authors.lastname: Du
authors.forename: Ting
authors.initials: T
authors.lastname: Zhou
authors.forename: Bing
authors.initials: B
authors.lastname: Han
authors.forename: Fei
authors.initials: F
authors.lastname: Yu
authors.forename: Rui
authors.initials: R
authors.lastname: Yang
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Hu
authors.forename: Yuanying
authors.initials: Y
authors.lastname: Ni
authors.forename: Quanhong
authors.initials: Q
authors.lastname: Li
mesh_terms: D010367:Arachis / Q000737:chemistry*; D005591:Chemical Fractionation / Q000379:methods*; D003296:Cooking; D000431:Ethanol / Q000737:chemistry; D005690:Galactose / Q000737:chemistry / Q000302:isolation & purification; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification*; D013499:Surface Properties; D013696:Temperature
chemical_list: D011134:Polysaccharides; D000431:Ethanol; D005690:Galactose