Physicochemical characterization of starches from Amaranthus cruentus grains
1998
Hoover, R. | Sinnott, A.W. | Perera, C.
The physicochemical properties of starches isolated from three cultivars (Mexican, African and A200D) of Amaranthus cruentus grains were studied. The yield of starch was in the range 29.0 - 38.3 % on a whole grain basis. The starch granules were polygonal with smooth surfaces. The granule size was in the range 0.75 - 1.5 micron-m for all three cultivars. The free, bound and total starch lipids ranged from 0.05 to 0.07 %, from 0.16 to 0.28 and from 0.20 to 0.35 %, respectively. The total amylose content ranged from 3.9 to 5.7 % of which 10.3 to 15.8 % were complexed by native lipid. The X-ray pattern was of the "A" type. The intensities of the major diffraction patterns followed the order: Mexican African A200D. The swelling factor followed the oder: A200 D African Mexican. All thre starches exhibited identical pasting temperatures. However, they differed with respect to the highest viscosity reached during the heating cycle (Mexican A200D African), viscosity at 95 degree C (Mexican A200D African), the extent of the breakdown (African A200D - Mexican) in viscosity (during the holding cycle at 95 degree C) and setback (A200D African Mexican). The gelatinization temperature ranges were 72.2 - 91.0 degree C (Mexican), 69.8 - 84.1 degree C (African) and 69.0 - 83.6 degree C (A200D). The enthalpy of gelatinization (J g(-1)) were 11.8 (Mexican), 12.3 (African) and 14.5 (A200D). The extent of acid hydrolysis (2.2 N HCl at 35 degree C) followed the oder: A200D African Mexican. The susceptibility of the starches towards hydrolysis by porcine pancreatic alpha-amylase followed the order: African A200D Mexican. The freeze-thaw stability followed the oder Mexican African A200D. The results of this study showed that bonding forces within the amorphous and crystalline regions are most pronounced in the Mexican cultivar.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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تم تزويد هذا السجل من قبل ZB MED Nutrition. Environment. Agriculture