+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Structural transformations during gelatinization of starches in limited water: combined wide- and small-angle X-ray scattering study

, : Structural transformations during gelatinization of starches in limited water: combined wide- and small-angle X-ray scattering study. Biomacromolecules 7(4): 1231-1238

Rice flour (18-25% moisture) and potato starch (20% moisture) were heated with continuous recording of the X-ray scattering during gelatinization. Rice flours displayed A-type crystallinity, which gradually decreased during gelatinization. The development of the characteristic 9 nm small-angle X-ray scattering (SAXS) peak during heating at sub-gelatinization temperatures indicated the gradual evolution into a stacked lamellar system. At higher temperatures, the crystalline and lamellar order was progressively lost. For potato starch (B-type crystallinity), no 9 nm SAXS peak was observed at ambient temperatures. Following the development of lamellar structures at sub-gelatinization temperatures, B-type crystallinity and lamellar order was lost during gelatinization. On cooling of partially gelatinized potato starch, A-type crystallinity steadily increased, but no formation of stacked lamellar structures was observed. Results were interpreted in terms of a high-temperature B- to A-type recrystallization, in which the lateral movement of double helices was accompanied by a shift along their helical axis. The latter is responsible for the inherent frustration of the lamellar stacks.


PMID: 16602743

DOI: 10.1021/bm050651t

Other references

Barlow, H.; Halaki, M.; Stuelcken, M.; Greene, A.; Sinclair, P.J., 2014: The effect of different kick start positions on OMEGA OSB11 blocks on free swimming time to 15m in developmental level swimmers. The introduction of the OMEGA OSB11 starting blocks (Swiss Timing, Corgémont, Switzerland) which feature an adjustable inclined plate built into the rear of the platform, have led to the evolution of the "kick start" style of swimming s...

Cooper, E.; Sims, J.; Cunningham, S.; Huang, J.; Berti, W., 1999: Chelate-assisted phytoextraction of lead from contaminated soils. Phytoextraction, a remediation strategy for lead (Pb)-contaminated soils that removes soil Pb through plant uptake and harvest, may be enhanced by use of synthetic chelates. We evaluated Pb desorption from four contaminated soils (total Pb 1278-14...

Lee, J.H.; Ryu, K.H., 1996: Development of a simple autonomous vehicle for greenhouse works. This study was conducted to develop a simple battery powered autonomous vehicle for greenhouse work. A steering method using the speed difference between 2 independent driving motors was adopted. A DC motor driving circuit, speed control circuit a...

King Robert W.; Kerrich Robert W.; Daddar Robin, 1988: REE distributions in tourmaline; an INAA technique involving pretreatment by B volatilization. American Mineralogist: -4, Pages 424-431. 1988.

Benson, Dm, 1986: Relationship of soil temperature and moisture to development of Phytophthora root rot of azalea. Journal of environmental horticulture 4(4): 112-115

Pozzo, M.; Alfè, D.; Amieiro, A.; French, S.; Pratt, A., 2008: Hydrogen dissociation and diffusion on Ni- and Ti-doped Mg(0001) surfaces. It is well-known, both theoretically and experimentally, that alloying MgH(2) with transition elements can significantly improve the thermodynamic and kinetic properties for H(2) desorption, as well as the H(2) intake by Mg bulk. Here, we present...

Yaméogo, K.Robert.; Perry, R.T.; Yaméogo, Aé.; Kambiré, C.; Kondé, M.Kader.; Nshimirimana, Déogratias.; Kezaala, R.; Hersh, B.S.; Cairns, K.Lisa.; Strebel, P., 2005: Migration as a risk factor for measles after a mass vaccination campaign, Burkina Faso, 2002. Background: Shortly after a measles supplementary immunization activity (SIA) targeting children from 9 months to 14 years of age that achieved high coverage, Burkina Faso had a large, serologically confirmed measles outbreak. To investigate the c...

Toda, Tadao, 1930: Lecithase of bacteria and the question of bacteriolysis of acid-fast bacilli in lecithin emulsion. As a result of experiments briefly tabulated here, the author concludes that many bacteria split lecithin through the action of the lecithase which they produce. Lecithase of paratyphoid A and B. prodigiosus reached its highest activity at 40[degr...

Hurd, M.K.; Perry, S.A.; Perry, W.B., 1996: Nontarget effects of a test application of diflubenzuron to the forest canopy on stream macroinvertebrates. Forest application of diflubenzuron (DFB) is commonly used in mid-Atlantic states for control of gypsy moths in hardwood forests. To assess effects of the pesticide on nontarget organisms, DFB (Dimilin) was applied by helicopter on May 16, 1992, t...

Strang, C.; Simpson, J.A., 1953: Carcinomatous abscess of the lung. Thorax 8(1): 11-26