title: Effects of some extrusion variables on physicochemical characteristics of extruded corn starch-passion fruit pulp (Passiflora edulis) snacks.
abstract: The aim of this work was to study the effect of the addition of passion fruit pulp (PFP: 0-7%), the variation of barrel temperature in the third zone extruder (BT: 80-140 °C) and feed moisture (FM:16-30%) in a blend of corn starch and passion fruit pulp on different physicochemical characteristics of directly expanded snacks by extrusion technology. Single-screw laboratory extruder and a central, composite, rotatable experimental design were used. Expansion index of extrudates ranged between 1.0 and 1.8. Decreasing of feed moisture (18%), passion fruit pulp concentration (1.42%) and the increasing of barrel temperature (127 °C) resulted in higher expansion index. The increasing of feed moisture and passion fruit pulp concentration resulted in higher penetration force values of extrudates. The passion fruit pulp concentration showed a highly significant effect (p ≤ 0.01) on the L *, a * and b * parameters. Passion fruit pulp has a reasonable source of β-carotene, proteins and dietary fibers that can be added to expanded snacks.
authors.affiliation: Instituto de Ciencias Básicas, Universidad Veracruzana, Av. Dr. Rafael Sánchez Altamirano s/n Col. Industrial-Animas. CP, 91190, Xalapa, Ver, Mexico, pa_llely@hotmail.com.
authors.forename: R Nallely Falfán
authors.initials: RN
authors.lastname: Cortés
authors.forename: Iñigo Verdalet
authors.initials: IV
authors.lastname: Guzmán
authors.forename: Fernando
authors.initials: F
authors.lastname: Martínez-Bustos
mesh_terms: D000975:Antioxidants; D003116:Color; D004032:Diet; D004043:Dietary Fiber / Q000032:analysis; D004044:Dietary Proteins / Q000032:analysis; D005511:Food Handling / Q000379:methods*; D005638:Fruit / Q000737:chemistry; D006801:Humans; D009753:Nutritive Value; D029598:Passiflora / Q000737:chemistry; D062410:Snacks; D013213:Starch; D013696:Temperature; D014867:Water; D003313:Zea mays; D019207:beta Carotene / Q000032:analysis
chemical_list: D000975:Antioxidants; D004043:Dietary Fiber; D004044:Dietary Proteins; D019207:beta Carotene; D014867:Water; D013213:Starch