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.
A new double cropping potato cultivar 'Goun' was developed by Highland Agriculture Research Center, National Institute of Crop Science (NICS), RDA in 2007. This cultivar was obtained from the cross between 'Chubaek' and 'Lemhi russet' in 1998. The seedling and line selections were performed from 1999 to 2000, preliminary and advanced yield trials were carried out from 2001 to 2004, and the regional yield trials were conducted at three locations from 2005 to 2006. 'Goun' has white flower, green wide leaflet and petiole, short oval tuber with beige skin and white flesh. This cultivar has mid resistance to common scab and potato leaf roll virus. The dry matter content were 20.4 and 21.4% in spring and autumn season, respectively, which were similar with those of 'Atlantic' and higher than 'Dejima'. Also, the potato chip color of 'Goun' was similar with that of 'Atlantic' in spring and autumn season. The dormancy of 'Goun' was 60~70 days after harvest, which was 5~10 days longer than 'Dejima'. The average yield of tubers in spring and autumn season were 33.2 and 26.3 ton/ha in the regional yield trials, which were 13% and 14% lower in spring and autumn season, respectively compared to 'Dejima'. 'Goun' can be used for the potato chip processing and table stock after autumn cultivation in potato double cropping area of Korea.
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