Variation of 1-kestose, nystose and higher fructooligosaccharides in burdock root stored under different temperature regimes

摘要

The variation of fructooligosccharides (FOSs) of differed degree of polymerization (DP), 1-kestose, nystose, GF4, GF5, GF6, GF7 and GF8 in burdock roots stored during 42 days underthree different temperature regimes, 0, 15 and 20 °C was investigated. Results showed that 1-kestose increased more significantly at 0 and 15 °C, and nystose showed similar variation butthe increase observed at 0 °C was higher than those observed at 15 and 20 °C. The fructosylnystose(GF4) increased significantly during the first three days of storage but slightly andprogressively during the four following weeks, and the GF5 and GF6 showed close pattern underthe three different storage temperatures. The higher oligomer GF7 showed similar variation tothese of GF6 but the increase during the first four weeks of storage was lower at 0 °C. At 0 °C,GF8 showed similar variation to those of GF5, GF6 and GF7, but at 15 and 20 °C, GF8 increasedafter three days and remained quite stable during three weeks but increased at 20 °C during thelast two weeks. Overall, results showed that the different FOS increased significantly during thefirst four weeks at 15 and 20 °C and then decreased, while this decrease was not observed at 0°C.