Content of alpha-chaconine and alpha-splanine in groups of potato varieties listed in the National Book of Varieties of the Czech Republic
2000
Zrust, J. | Horackova, V. | Prichystalova, V. | Rejlkova, M. (Vyzkumny Ustav Bramborarsky, Havlickuv Brod (Czech Republic))
A field experiment was established in 1996 to 1998 with 34 Czech and 48 foreign varieties. The potatoes were divided according to the length of their vegetation period and the differences in the SGAS content between individual groups of the Czech varieties were compared with the foreign ones. High-performance liquid chromatography (HPLC) was used to determine the level of alpha-chaconine and alpha-solanine in tuber samples after physiological maturation. The SGAS content was assessed in raw unpeeled tubers, in tubers where ca 1.5 mm was peeled off and in mechanically damaged unpeeled tubers. Before analysis the tubers were stored in a chamber at 4 deg C. After mechanical injury the samples were kept for one week at ca 20 deg C in darkness before analysis. In raw unpeeled tubers of the Czech varieties the SGAS content was higher than in the foreign varieties; in the very early varieties by 24 % and in the medium late to late varieties by 55 %. After peeling the SGAS content decreased by 51.5 % in the Czech varieties and by 55.1 % in the foreign varieties. After mechanical damage the content of alpha-solanine in Czech varieties increased more than alpha-chaconine (in three years on average by 78 to 103.4 % and by 48.8 to 70.4 %, respectively).
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