Commercial high-amylose com, ordinary com and potato starches 'were fully acetyl"ted by reacting the starches at 123°C for 5 h in fourfold quantities of acetic anhydride to which 11 010 (w;'w 5t"rch) of sodium hydroxide catalyst had been added as 50 010 aqueous solution. Intrinsic viscosities of the starches regenerated from their esters 'were slightly lower than the 'values for the correspondi...

Coleus tuberosus, also known as black potato, is one of the Indonesian local tubers consumed a carbohydrate substituent. Therefore, this study aimed to examine effect processing and cooling methods on in vitro digestibility potato starch. Furthermore, two factors Randomized Block Design with 2x3 experimental design was used, which consisted (boiling, roasting, microwave) at room temperature 4 °...

Isoamylases are debranching enzymes that hydrolyze alpha-1,6 linkages in alpha-1,4/alpha-1,6-linked glucan polymers. In plants, they have been shown to be required for the normal synthesis of amylopectin, although the precise manner in which they influence starch synthesis is still debated. cDNA clones encoding three distinct isoamylase isoforms (Stisa1, Stisa2, and Stisa3) have been identified...

BACKGROUND: Fat replacers are ingredients that can replace fat in many foods, therefore,many consumers have limited their dietry intake of fat and calories due to diet and health concerns. OBJECTIVES: The present study investigated the effect of modified starch on some physico-chemical and sensory properties of low fat Hamburger. METHODS: In this research, modified starch potato, tapioca (Acety...

Cold-induced sweetening (CIS) is the accumulation of reducing sugars in potato tubers at low storage temperatures. It is undesirable because it results in dark fry products. Our study evaluated the relationship between genetic resistance to CIS and two starch parameters, amylose content and starch granule size. We found that the amylose content in four CIS-resistant varieties was higher than th...

Trehalose-6-phosphate (T6P) is a signaling metabolite that regulates carbon metabolism, developmental processes, and growth in plants. In Arabidopsis (Arabidopsis thaliana), T6P signaling is, at least in part, mediated through inhibition of the SNF1-related protein kinase SnRK1. To investigate the role of T6P signaling in a heterotrophic, starch-accumulating storage organ, transgenic potato (So...

The potato (Solanum tuberosum L.) had its start in the Andean highlands of South America, where archeological evidence indicates it has been cultivated for at least 8,000 years (72). Today it is grown on all continents except Antarctica. Serving as a primary food source to indigenous people when the Spanish explorers arrived in Peru in the mid-1500s, the potato traveled the globe as a valuable ...

The recently discovered potato tuber (Solanum tuberosum) alpha-glucan, water dikinase (GWD) (formerly known as R1) catalyzes the phosphorylation of starch by a dikinase-type reaction mechanism in which the beta-phosphate of ATP is transferred to either the C-6 or the C-3 position of the glucosyl residue of starch. In the present study, we found that the GWD enzyme is inactive in the oxidized fo...

Starch fillers were extracted from three plant sources namely amora tuber, Tacca lentopeteloides; sweet potato, Ipomoea batatas; yam starch, Dioscorea rotundata and their particle size, pH, amylose, amylopectin percentage decomposition determined accordingly. The starch was introduced into natural rubber in liquid phase (through gelatinization) by the latex compounding method compounded accordi...

Purple sweet potato starch is a potential resource for resistant starch production. The effects of heat-moisture treatment (HMT) and enzyme debranching combined heat-moisture treatment (EHMT) on the morphological, crystallinity and thermal properties of PSP starches were investigated. The results indicated that, after HMT or EHMT treatments, native starch granules with smooth surface was destro...