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dc.contributor.authorFerrini, Luara M. K. [UNESP]
dc.contributor.authorRocha, Thais S. [UNESP]
dc.contributor.authorDemiate, Ivo M.
dc.contributor.authorFranco, Celia M. L. [UNESP]
dc.identifier.citationStarch-starke. Malden: Wiley-blackwell, v. 60, n. 8, p. 417-425, 2008.
dc.description.abstractPhysicochemical, structural and morphological characteristics of maize and cassava starches treated with 0.36% concentrated HCl in anhydrous methanol at WC for 1-8 h were analyzed and compared. Average yield of modified starch was about 97% for both starches. The solubility of the acid-methanol treated starches increased with temperature and after 3 h of treatment reached 93% for maize starch and 97% for cassava starch at 95 degrees C. After 8 h of treatment, the average size of the cassava starch granules decreased from 14.9 to 11.1 mu m. The action of acid-methanol on the maize starch was more subtle, reducing the granule average size from 11.8 to 11.3 mu m. Scanning electron micrographs showed that the granule surfaces were rough and exfoliated after treatment suggesting exocorrosion that was more evident for cassava starch. From GPC, it was noted that amylose and amylopectin were partially degraded during treatment. Starch crystallinity gradually increased with duration of treatment. The amylose content decreased from 21.4 to 18.8% and from 26.3 to 23.0% and the intrinsic viscosity was reduced from 2.36 to 0.21 and from 1.85 to 0.04 for cassava and maize starches, respectively. The gelatinization temperatures increased whereas pasting viscosities decreased with reaction time, especially for cassava starch. These results suggested that the attack of acid-methanol, which was more effective on cassava starch granules, occurred preferentially in the amorphous areas located in the granule periphery and composed of amylose and amylopectin.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCargill Industry (Brazil)
dc.sourceWeb of Science
dc.subjectacid-methanol treatmenten
dc.subjectStructural characteristicsen
dc.subjectPhysicochemical propertiesen
dc.titleEffect of acid-methanol treatment on the physicochemical and structural characteristics of cassava and maize starchesen
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Ponta Grossa (UEPG)
dc.description.affiliationUniv Estadual Paulista, Dept Engn & Tecnol Alimentos, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUniversidade Estadual de Ponta Grossa (UEPG), Dept Engn Alimentos, Ponta Grossa, PR, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Engn & Tecnol Alimentos, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
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unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt[4][4]
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