PHOTOINDUCED CHANGES IN THE TOTAL CHLOROGENIC ACID CONTENT OF POTATO (SOLANUM-TUBEROSUM) TUBERS

The exposure of potato tubers to light resulted in a significant culti var-dependent increase in chlorogenic acid content. The magnitude of t he observed increase resulting from 48 h light exposure was significan tly correlated with the initial chlorogenic acid content of the tubers and also with the previously reported photo-induced increases in tota l glycoalkaloids. Time-course studies indicated that the greatest rate of increase occurred between 8 and 16 h continual exposure. Prolonged storage under light revealed that chlorogenic acid values in some cul tivars reached a maximum value after 48 h, whilst in others these cont inued to increase almost linearly until the end of the experiment 5 da ys later.