title: Effect of process and machine parameters on physical properties of extrudate during extrusion cooking of sorghum, horse gram and defatted soy flour blends.
abstract: Extrusion cooking of sorghum (Sorghum vulgaris), horse gram (Dolichos biflorus) and defatted soy (Glycine max) flour blends was done to prepare snacks by using a Brabender single-screw laboratory extruder. The combined effect of moisture content, blend ratio of feed, barrel temperature and screw speed of extruder on physical parameters of extrudate was studied. It was observed that 15% moisture content of feed, 80:10:10 (sorghum flour: horse gram flour: defatted soy flour) of blend ratio, 130 °C barrel temperature and 130 rpm of screw speed gave the highest sectional expansion index and longitudinal expansion index of extrudate, while 12% moisture content, 75:15:10 of blend ratio of feed, 135 °C of barrel temperature and 135 rpm of screw speed gave lowest bulk density of extrudate. A central composite rotable design (CCRD) of response surface methodology was used to develop prediction model. Second order quadratic regression model fitted adequately in the variation. The significance was established at p ≤ 0.05. It was also observed that increasing feed moisture content results in a higher density and lower expansion of extrudate. Increasing barrel temperature and screw speed reduced density but increased expansion of extrudate.
authors.affiliation: Department of Post Harvest Process and Food Engineering, College of Agricultural Engineering, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur, 482004 Madhya Pradesh India.
authors.forename: A L
authors.initials: AL
authors.lastname: Basediya
authors.affiliation: Department of Post Harvest Process and Food Engineering, College of Agricultural Engineering, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur, 482004 Madhya Pradesh India.
authors.forename: Sheela
authors.initials: S
authors.lastname: Pandey
authors.affiliation: Department of Post Harvest Process and Food Engineering, College of Agricultural Engineering, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur, 482004 Madhya Pradesh India.
authors.forename: S P
authors.initials: SP
authors.lastname: Shrivastava
authors.affiliation: Central Institute of Agricultural Engineeing, Bhopal, Madhya Pradesh India.
authors.forename: Khursheed Alam
authors.initials: KA
authors.lastname: Khan
authors.affiliation: Department of Post Harvest Process and Food Engineering, College of Agricultural Engineering, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur, 482004 Madhya Pradesh India.
authors.forename: Anura
authors.initials: A
authors.lastname: Nema
keywords: Bulk density; Defatted soy flour; Extrusion cooking; Horse gram; Longitudinal expansion index; Sectional expansion index; Sorghum