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The objective of the present study was to investigate the rheological, pasting, and thermal properties of octenyl succinic anhydrate (DSA)-modified potato starch. Potato starch was modified using different concentrations of DSA (0, 1, 3, and 5%, v/v). The degree of substitution (DS) for the DSA-modified starch ranged from 0.0012 to 0.0055. The amylose leaching values of native and DSA-modified potato starch with different DS levels were in the range of 47.09-87.32%. The gel strength values of the DSA-modified starch were lower than those of native potato starch. Rapid Visco Analyzer data showed that peak, hot pasting, final and setback viscosities of the native starch decreased after DSA modification. Dynamic shear rheological tests, conducted at 4 °C, indicated that DSA-modified potato starch had weak gel-like behavior with the storage moduli (G') higher than the loss moduli (G") over most of the frequency ranges (0.63-63.8 rad·s -1 ).Keywords: potato starch; octenyl succinic anhydride; rheological property; pasting property; retrogradation.Practical Application: Higher stability of DSA-modified potato starch can better withstand freeze-thawing of frozen food.

Abstract:This study was performed to investigate differences of antioxidant activity, the content of free amino acids including GABA(gama-amino butyric acid) among mungbean cultivars grown in Highland area (Jinbu) and to compare those between seeds and sprouts. In DPPH (diphenyl picrydrazyl) radical scavenging activity, 'Jangan' mungbean activity was more higher than that of other cultivars. The content of total phenolic compounds of mungbean ranged from 1,186 to 1,493 ㎍/g in seed and 2,321 to 2,783 ㎍/g in sprout. Among amino acids of seeds, the content of glutamic acid was highest in 'Soseon' mungbean, and contents of almost amino acids increased during sprouting of seeds. The content of GABA that are known as a material having high functional effects on human body was also analyzed. When the relatively high content of GABA was observed in seeds of almost mungbean grown in highland, and their contents rapidly increased after sprouting from seeds. As a result of this experiment, it is expected that mungbean will be developed to a good alternative crop having high value as functional food materials in highland area of Korea.