Physical characteristics of starch granules and susceptibility to enzymatic degradation.
Eur J Clin Nutr
; 46 Suppl 2: S3-16, 1992 Oct.
Article
em En
| MEDLINE
| ID: mdl-1330527
ABSTRACT
Starch, the most abundant component of the diet, is characterized by its variety as well as the versatility of its derivatives in foods. This paper is an overview of the main physical characteristics of the native starch granule. Three different levels of organization are presented macromolecular structure, crystalline organization and ultrastructure. Starch consists of amylose and amylopectin. Amylose is an essentially linear polymer composed of alpha-1,4-linked D-anhydroglucose units (AGU); amylopectin is a branched polymer clustering a large amount of short linear chains by the linkage of alpha-1,6-bonds, constituting about 5% of the total glycosidic bonds. In the native starch granules, a large number of the macromolecular chains are organized in crystalline structures. Three forms have been found, the A, B and C patterns. So far only A and B starch crystals have been modelled. There is a variation in the susceptibility of the starch granules to enzymatic digestion. This is explained by variation in the morphology of the granules and their crystalline organization.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Amido
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Eur J Clin Nutr
Assunto da revista:
CIENCIAS DA NUTRICAO
Ano de publicação:
1992
Tipo de documento:
Article
País de afiliação:
França