title: Studies on the steady shear flow behavior and chemical properties of water-soluble polysaccharide from Ziziphus lotus fruit.
abstract: The extraction of water-soluble polysaccharide from Ziziphus lotus fruit (WPZL) was performed by ultrasonic-assisted extraction method. A Box-Behnken design (BBD) was applied to evaluate the effects of three independent variables (ultrasonic power (X1: 70-100 W), extraction time (X2: 10-30 min), extraction temperature (X3: 55-95 °C), and water to raw material ratio (X4: 5-25)) on the extraction yield of APH. The effect of temperature and concentration on flow behavior of gum solution was studied. WPZL solutions exhibited shear-thinning non-Newtonian flow behavior for concentrations above 0.5% (w/v). The viscosity of fully hydrated gum solutions decreased as temperature increase. The correlation analysis of the mathematical-regression model indicated that quadratic polynomial model could be employed to optimize the extraction of WPZL. The optimal conditions to obtain the highest extraction of WPZL (13.398 ± 0.019%) were as follows: ultrasonic power, 88.77 W; extraction time, 29.96 min, extraction temperature, 77.73 °C and water to raw material ratio 24.44 mL/g.
authors.affiliation: Department of Food Science and Technology, Khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran. Electronic address: mostafa.adeli_68@yahoo.fr.
authors.forename: Mostafa
authors.initials: M
authors.lastname: Adeli
authors.affiliation: Department of Food Science & Technology, Ramin Agricultural & Natural Resources University, Ahvaz, Iran. Electronic address: vsamavati@ut.ac.ir.
authors.forename: Vahid
authors.initials: V
authors.lastname: Samavati
mesh_terms: D002241:Carbohydrates / Q000737:chemistry / Q000302:isolation & purification*; D005638:Fruit / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry / Q000302:isolation & purification*; D012996:Solutions / Q000737:chemistry; D013696:Temperature; D014783:Viscosity; D014867:Water / Q000737:chemistry; D031957:Ziziphus / Q000737:chemistry*
chemical_list: D002241:Carbohydrates; D010936:Plant Extracts; D011134:Polysaccharides; D012996:Solutions; D014867:Water
keywords: Antioxidant activity; Extraction; Rheological properties; Water-soluble polysaccharide; Ziziphus lotus