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| Effects of different color fixative technologieson quality of dried longan |
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| Abstract: |
| Different color fixatives and technology of heat dump drying were studied to dried longan in this
paper. The parameters such as color fixative time，drying temperature and drying time were investigated during
longan drying process. Results showed that the total sugar content of dried longan increased with color fixative time
extending，and it increased firstly and then decreased with drying temperature increasing. The acidity of dried longan
increased firstly and then decreased with the increase of drying temperature and drying time. The color fixative of 1%
sodium metabisulfite and 0.5% ascorbic acid was used to inhibit the browning of longan，and the optimal processes
of heat pump drying of dried longan were as follows：color fixative time of 4 minutes，drying at 60℃，for 12 h. The
dried longan plum had uniform color，the total sugar content was 2.55%，the acidity was 25.7%. Thus，different
color fixatives and technologies of heat dump drying had influences on the quality of dried longan，and the optimal
technology of heat dump drying of longan was reliable and advisable and the product had better quality using the
process. |
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