Lettuce stem discs were treated with different concentrations of ethanol. Among these treatment, 200 mL/L ethanol exhibited the best effect by maintaining pale green color during the storage period. However, untreated control browned significantly as evi- denced by the lower lightness, L* value, and higher in redness a* and yellowness b* in the surface of fresh-cut lettuce stem discs stored at 5 C (Fig. 1A, B, C). Notably that the L* values decreased rapidly in control but remained relatively stable in ethanol treated samples during 14 days of storage. The a* values in the control group increased rapidly at the beginning of the storage and reached a plateau on day 14, while those of the ethanol treatment group remained constantly low. The a* values for untreated control were significantly higher (p < 0.05) than those for ethanol treated sam- ples on all evaluation days after day 0. The b* color values for both ethanol-treated stem discs and controls increased during storage. However, the b* values for treated samples did not increase as rapidly or to as great extent as those for controls, indicating that the ethanol treatment retarded the yellowing of the lettuce stem discs. As shown in Fig. 1D, pink and brown dots appeared on the cut surface of controls at day 5. However, the cut surface of ethanol
treated discs had only very faint browning around the outer edge. These results show that the 200 mL/L ethanol treatment signifi- cantly inhibited the browning of lettuce stem discs.
Lettuce stem discs were treated with different concentrations of ethanol. Among these treatment, 200 mL/L ethanol exhibited the best effect by maintaining pale green color during the storage period. However, untreated control browned significantly as evi- denced by the lower lightness, L* value, and higher in redness a* and yellowness b* in the surface of fresh-cut lettuce stem discs stored at 5 C (Fig. 1A, B, C). Notably that the L* values decreased rapidly in control but remained relatively stable in ethanol treated samples during 14 days of storage. The a* values in the control group increased rapidly at the beginning of the storage and reached a plateau on day 14, while those of the ethanol treatment group remained constantly low. The a* values for untreated control were significantly higher (p < 0.05) than those for ethanol treated sam- ples on all evaluation days after day 0. The b* color values for both ethanol-treated stem discs and controls increased during storage. However, the b* values for treated samples did not increase as rapidly or to as great extent as those for controls, indicating that the ethanol treatment retarded the yellowing of the lettuce stem discs. As shown in Fig. 1D, pink and brown dots appeared on the cut surface of controls at day 5. However, the cut surface of ethanol treated discs had only very faint browning around the outer edge. These results show that the 200 mL/L ethanol treatment signifi- cantly inhibited the browning of lettuce stem discs.
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