Data/hora: 17/06/2024 11:05:14

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 03/11/2016
Data da última atualização: | 11/07/2017
Autoria: | HORNUNG, P. S.; SILVEIRA, A. C. da; LAZZAROTTO, S. R. da S.; SIQUEIRA, G. L. de A. de; SCHNITZLER, E.; RIBANI, R. H.; LAZZAROTTO, M.
Afiliação: | Polyanna Silveira Hornung, UFPR; Ana Claudia da Silveira, UFPR; Simone Rosa da Silveira Lazzarotto, Doutoranda da UEPG; Geisa Liandra de Andrade de Siqueira, Doutoranda da UEPG; Egon Schnitzler, UEPG; Rosemary Hoffmann Ribani, UFPR; MARCELO LAZZAROTTO, CNPF.
Título: | Thermogravimetric alterations of cassava starch granules induced by hydrogen peroxide, UV rays and microwave.
Ano de publicação: | 2016
Fonte/Imprenta: | In: CONGRESSO BRASILEIRO DE ANÁLISE TÉRMICA E CALORIMETRIA, 10.; CONGRESSO PAN AMERICANO DE ANÁLISE TÉRMICA E CALORIMETRIA, 4., 2016, São Paulo. Trabalhos. [S.l.]: ABRATEC, 2016.
Páginas: | 4 p.
Descrição Física: | Disponível online.
Idioma: | Inglês
Conteúdo: | Starches are applied in several fields of industry. Amylose and amylopectin (natural polymers) constitute the starch in vegetable cells. In some processes native starches cannot support high stress conditions (high temperatures/acidity). Then, modification methods are developed aiming the improving of starch technological utilization. Oxidative modification with H2O2 has been the subject of many researches. UV rays as well microwave irradiation can be used. The aim was to confirm possible thermogravimetric alterations in native cassava starch (A) granules due to a double starch modification: 1st step) H2O2 standard solutions 0.1 mol L-1 (B), 0.2 mol L-1 (C) and 0.3 mol L-1 (D) and UV rays exposure for 1h; 2nd step) microwave irradiation for 5 min. The results of thermogravimetric curves (TG-DTA) show that the behaviors of the starch proprieties were modified. Highlighting, the modified samples C and D showed a decrease on the thermal stability step. This alteration turned them suitable to many field of industry like the paper one.
Palavras-Chave: | Active oxygen; Environment-friendly reagent.
Thesagro: | Amido; Mandioca.
Thesaurus Nal: | Cassava; Starch.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/149549/1/2016-MarceloL-CBATC-Thermogravimetric.pdf
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (55392-1) - UPC - AA - DD -  -  -  - DIS