Effect of the year and storage on ascorbic acid content and total polyphenol content in three apple varieties
2000
Lachman, J. | Orsak, M. | Pivec, V. | Kucera, J. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic). Agronomicka Fakulta)
In two years (1997 and 1998) ascorbic acid content (AA) and total polyphenol content (TP) were investigated in three applle varieties (Idared, Gloster and Ontario) cultivated under equal conditions. AA content was determined by titration method with 2,6-dichlorphenolindophenol and TP content spectrophotometrically with Folin-Ciocalteau's reagent. In two years' trials AA and TP contents were estimated immediately after harvest in September and then monthly during storage for six months at +5 deg C. Statistically high significant differences were determined both in AA and TP contents during storage period - there was observed significant AA and TP decrease. The highest antioxidant content in both years was determined in early variety Ontario (in average 12.05 mg/kg AA, 2011.5 mg/kg TP), the lowest in semi-early variety Gloster (in average 5.45 mg/kg AA, 1738.0 mg/kg TP). The highest decrease of AA content was in variety Ontario (-30.05 %rel), the lowest in variety Gloster (-22.93 %rel ); in TP contents the differences were negligible (-27.14 and -27.82 %rel). In spite of this decrease were in Ontario variety both values after six months storage were the most favourable (8.45 mg/kg AA, 1466.5 mg/kg TP).
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