INVESTIGADORES
LOPEZ Beatriz Alicia
artículos
Título:
Thermal and physicochemical characterization of seven argentine rice flours and starches.
Autor/es:
ITURRIAGA L., LÓPEZ B., AÑON M.C
Revista:
FOOD RESEARCH INTERNATIONAL
Editorial:
Elsevier
Referencias:
Lugar: Toronto, Ontario; Año: 2004 vol. 37 p. 439 - 447
ISSN:
0963-9969
Resumen:
Abstract
Differential scanning calorimetry (DSC) was used to evaluate phase transitions of rice flours and starches from seven new argentine
genotypes in systems with different water content. Flours of high, medium and low TG (gelatinization temperature) were
detected; DHG (total gelatinization enthalpy) showed two homogenous groups (8.19.2 and 10.110.4 mJ/mg). Amyloselipid
complex melting endotherm in waxy rice flours was observed despite the low amylose content. It is suggested that this complex could
be originated in the longest amylopectin branches and extra granular complexing lipids. Differential behaviour in waxy genotypes
was found with decrease of water content, probably due to the highest water absorption capacity of the AP (amylopectin). Genotypes
with high (26.828.6 g/100 starch), medium (19.620.7 g/100 g starch) and low total amylose (TAM) content was found
(1.32.1g/100 g starch). In using X-ray diffraction, the relative crystallinity in waxy genotypes was found to be higher (48%) than
that corresponding to the non-waxy ones (3740%). A linear correlation between gelatinization process cooperativity and TAM was
found to exist but no between DHG and TG with crystallinity and TAM.
Glass transitions (Tg) of gelatinized starchwater systems were also determined by DSC. Results indicated higher values ()5.0 to
6.3 C) for flours than for starches ()10 C).TG (gelatinization temperature) were
detected; DHG (total gelatinization enthalpy) showed two homogenous groups (8.19.2 and 10.110.4 mJ/mg). Amyloselipid
complex melting endotherm in waxy rice flours was observed despite the low amylose content. It is suggested that this complex could
be originated in the longest amylopectin branches and extra granular complexing lipids. Differential behaviour in waxy genotypes
was found with decrease of water content, probably due to the highest water absorption capacity of the AP (amylopectin). Genotypes
with high (26.828.6 g/100 starch), medium (19.620.7 g/100 g starch) and low total amylose (TAM) content was found
(1.32.1g/100 g starch). In using X-ray diffraction, the relative crystallinity in waxy genotypes was found to be higher (48%) than
that corresponding to the non-waxy ones (3740%). A linear correlation between gelatinization process cooperativity and TAM was
found to exist but no between DHG and TG with crystallinity and TAM.
Glass transitions (Tg) of gelatinized starchwater systems were also determined by DSC. Results indicated higher values ()5.0 to
6.3 C) for flours than for starches ()10 C).DHG (total gelatinization enthalpy) showed two homogenous groups (8.19.2 and 10.110.4 mJ/mg). Amyloselipid
complex melting endotherm in waxy rice flours was observed despite the low amylose content. It is suggested that this complex could
be originated in the longest amylopectin branches and extra granular complexing lipids. Differential behaviour in waxy genotypes
was found with decrease of water content, probably due to the highest water absorption capacity of the AP (amylopectin). Genotypes
with high (26.828.6 g/100 starch), medium (19.620.7 g/100 g starch) and low total amylose (TAM) content was found
(1.32.1g/100 g starch). In using X-ray diffraction, the relative crystallinity in waxy genotypes was found to be higher (48%) than
that corresponding to the non-waxy ones (3740%). A linear correlation between gelatinization process cooperativity and TAM was
found to exist but no between DHG and TG with crystallinity and TAM.
Glass transitions (Tg) of gelatinized starchwater systems were also determined by DSC. Results indicated higher values ()5.0 to
6.3 C) for flours than for starches ()10 C).DHG and TG with crystallinity and TAM.
Glass transitions (Tg) of gelatinized starchwater systems were also determined by DSC. Results indicated higher values ()5.0 to
6.3 C) for flours than for starches ()10 C).Tg) of gelatinized starchwater systems were also determined by DSC. Results indicated higher values ()5.0 to
6.3 C) for flours than for starches ()10 C).C) for flours than for starches ()10 C).
Keywords: Rice; Starch; Gelatinization; Starchlipid complex; Glass transitionsRice; Starch; Gelatinization; Starchlipid complex; Glass transitions