Evaluation of acid hydrolysis methods of starch to determine the degree of molecular dissolution

We have investigated methods of starch hydrolysis with the aim of finding an optimum method to completely hydrolyze starch granules. The significant factors in the hydrolysis of the starches were determined as starch concentration, acid (A) concentration, hydrolysis temperature (T) and hydrolysis time. Thus, the starches were hydrolyzed by sulfuric acid with acid concentration 1M at 100°C for 3 hours. The hydrolysis range was between 91 to 97 percent. Afterwards, the optimum operating condition was applied for hydrolysis of six kinds of the starches, Canna indica, Lepidium meyenii, Xanthosoma sagittifolium, Chenopodium palidicaule, Amaranthus caudatus, and Colocasia esculenta to evaluate the solubility index of the starches in 100% Dimethyl Sulfoxide (DMSO) solution. The starches were dissolved in 100% DMSO by stirring in water bath for 1h. The solubility index was determined after centrifugation (1000g for 10min) by investigated method. It was observed that solubility index correlates to amylose content, so the highest solubility was observed in Canna indica which contains the highest amylose content.

کلیدواژه ها:

Acid Hydrolysis ، Maca (Lepidium meyenii) ، Edible Canna (Canna indica) ، New Cocoyam (Xanthosoma agittifolium) ، Canihua (Chenopodium pallidicaule) ، Amaranth (Amaranthus caudatus) ، Old Cocoyam (Colocasia esculenta) ، Optimization ، DMSO ، Solubility index.