The color change due to non-enzymatic browning during storage
of MF-clarified pineapple juice was also determined by measurement
of absorbance at 420 nm, known as browning index.
Fig. 2 shows the absorbance at 420 nm of MF-clarified juice. The
browning index of clarified juice increased significantly with the
storage time (P < 0.05). In addition, the storage temperature also
affected the browning index during storage. It was evident that
the browning index of the juice stored at 27 and 37 C were higher
than that of the juice stored at 4 C. However, there was not much
difference detected in the browning index of the clarified juice
stored at 27, and 37 C. Similar results were observed during storage
of peach juice, stored at 3, 15, 30 and 37 C (Buedo et al., 2001).
In addition, Lee and Chen (1998) also found that the results of
browning measurements are in accordance with vitamin C
reduction.
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