Longan is one the most economically important fruits in the northern part of Thailand. There are
several preservation methods for reducing spoilage, increasing shelf life and adding value to product,such as canning, freezing and drying. The export value of dried longan in 2010 was $68 million [1]. The quality of dried product is a specific characteristic that is acceptable by the consumer. The color is one of the most important quality factors of dried longan flesh. Browning reaction occurs during the drying of the fruit and this has a significant impact on the color of the final dried product. The rate of the browning