title: Physicochemical and crystalline properties of standard maize starch hydrothermally treated by direct steaming.
abstract: The changes in physicochemical properties of standard maize starch (SMS) by three hydrothermal treatments; DV-HMT (Direct Vapor-Heat Moisture Treatment), RP-HMT (Reduced Pressurized-Heat Moisture Treatment) and DIC (instantaneous controlled pressure drop) were investigated at different processing conditions; steam pressure (SP) varied from 1 to 3bar during 20min. Starch was steamed by direct contact, whose interest was to intensify the heat transfer phenomenon but also the water transfer. The physicochemical changes of SMS depended on process conditions and their extent followed this order: DIC>RP-HMT>DV-HMT. All treatments significantly increased gelatinization temperatures and decreased the enthalpies, confirmed by loss of granules birefringence. From 2bar, the crystalline structure changed from A-type to Vh-type, revealing formation of amylose-lipid complexes during steaming. The results clearly showed that the particle size distribution depends on the melting extent of crystalline structure during treatment. At severe processing conditions the melted fraction increased and more complex aggregates of different sizes have been formed.
authors.affiliation: LaSIE, Université de La Rochelle, UMR-CNRS 7356, France; Université Paris Diderot, Sorbonne Paris Cité, MSC, UMR 7057, CNRS, F-75013, Paris, France.
authors.forename: Seyed-Amir
authors.initials: SA
authors.lastname: Bahrani
authors.affiliation: LUNAM Université, ONIRIS, CNRS, GEPEA, UMR 6144, Site de la Géraudière, Nantes F-44322, France.
authors.forename: Catherine
authors.initials: C
authors.lastname: Loisel
authors.affiliation: LaSIE, Université de La Rochelle, UMR-CNRS 7356, France.
authors.forename: Sid-Ahmed
authors.initials: SA
authors.lastname: Rezzoug
authors.affiliation: LaSIE, Université de La Rochelle, UMR-CNRS 7356, France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Cohendoz
authors.affiliation: INRA - Biopolymères Interactions Assemblages (UR1268), F-44300 Nantes, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Buleon
authors.affiliation: LaSIE, Université de La Rochelle, UMR-CNRS 7356, France. Electronic address: zrezzoug@univ-lr.fr.
authors.forename: Zoulikha
authors.initials: Z
authors.lastname: Maache-Rezzoug
mesh_terms: D000688:Amylose / Q000737:chemistry; D006358:Hot Temperature; D013213:Starch / Q000737:chemistry*; D013227:Steam; D014867:Water; D003313:Zea mays / Q000737:chemistry*
chemical_list: D013227:Steam; D014867:Water; D013213:Starch; D000688:Amylose
keywords: Hydrothermal processes; Particle aggregation; Physicochemical properties; Standard maize starch