PAL activity of control shoot increased quickly and reached
maximum values on day 3, showing about 66% increase (Fig. 6B),
but this was followed by a slowly decrease. These results suggest
that PAL might accelerate the browning of fresh-cut Chinese yam
due to synthesis of phenolic compounds. Moreover, the increase of
PAL activity was observed to be concomitant with the accumulation
of the total phenolic content. Some reports also have found that the
browning of fruit and vegetables was related to increasing PAL
activity and increased levels of phenolic compounds (Nguyen,
Ketsa,&Doorn, 2003). PAL activity of fresh-cut Chinese yam by
PAL activity of control shoot increased quickly and reachedmaximum values on day 3, showing about 66% increase (Fig. 6B),but this was followed by a slowly decrease. These results suggestthat PAL might accelerate the browning of fresh-cut Chinese yamdue to synthesis of phenolic compounds. Moreover, the increase ofPAL activity was observed to be concomitant with the accumulationof the total phenolic content. Some reports also have found that thebrowning of fruit and vegetables was related to increasing PALactivity and increased levels of phenolic compounds (Nguyen,Ketsa,&Doorn, 2003). PAL activity of fresh-cut Chinese yam by
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