Banca de DEFESA: THAÍS BARBOSA DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : THAÍS BARBOSA DOS SANTOS
DATA : 26/04/2018
HORA: 10:00
LOCAL: Embrapa Agroindústria de Alimentos
TÍTULO:

PHYSICOCHEMICAL AND MORPHOLOGICAL CHARACTERIZATION OF

PALAVRAS-CHAVES:

Cassava starch, amylopectin, waxy starch, paste viscosity, x-ray diffraction

PÁGINAS: 63
GRANDE ÁREA: Ciências Agrárias
ÁREA: Ciência e Tecnologia de Alimentos
RESUMO:

The characterization of different starches with varied functional properties, without chemical modification contributes to the creation of a low-cost infrastructure, such as naturally occurring waxy starch. Starch is a polysaccharide, consisting of linear chains (amylose) and branched chains (amylopectin). Waxy starch has a high percentage of amylopectin (greater than 95%) in its composition and can be found in nature without the need for chemical modifications; has a great potential of use in the industry as thickening agent, with low retrogradation. Cassava (Manihot esculenta Crantz) is a native tuberous root widely cultivated in tropical regions, as in Latin America, and is widely used as a source of starch. Embrapa has the germplasm bank of cassava, to be exploited in the production of starch for industrial use, which can be considered very important knowledge related to the characterization of these starches that may subsidies the production of new ingredients with differentiated technological properties. Thus, from the pre-selection of 803 genotypes of the Brazilian cassava germplasm bank, using the principal component analysis and NbClust, it was possible to determine the selection of 19 cassava genotypes similar to waxy cassava reference starches (7734-7WX and 7745-5WX). After selection of the genotypes of interest, the physicochemical and morphological characterization of these starches were performed comparing them with commercial waxy and native maize starch, considering the analysis of apparent viscosity, scanning electron microscopy, optical microscopy with polarized light, relative crystallinity profile by x-ray diffraction, amylopectin side chain determination, swelling power and solubility indices. The analysis of the results allowed the identification of genotypes with characteristics close to the reference waxy starch samples, and the genotype BGM0036 presented greater similarity in relation to the evaluated analyzes.

MEMBROS DA BANCA:
Externo ao Programa - 009.412.587-26 - CARLOS WANDERLEI PILER DE CARVALHO - EMBRAPA
Externo à Instituição - CAROLINE MELLINGER DA SILVA - EMBRAPA
Externo à Instituição - CRISTINA YOSHIE TAKEITI - EMBRAPA