STUDY ON DRYING TEMPERATURE ON DRYING DURATION AND QUALITY OF DRIED VEGETABLES
Abstract
Temperature effect to drying time and product quality have been investigated on 3 groups of vegetable: fat-rich, vitamin-rich and spice. Analyses results for acid, peroxide and iodine indices for the oil extracted from coconut, collected in Ben Tre, showed that ordinary method fordrying does not affect much to the overall quality of the material rich in saturated fatty acid. However for carrot, representative for the group rich in vitamin, drying at high temperature involved high loss of carotene amount up to 90% at 80°C. Similarly, garlic, a well-known spice showed decreasing up to 36% of its essential oil as well. This study confirmed that for the
material rich in vitamin, e.g. carrot and spice, e.g. garlic, it is needed further investigation for new drying method instead of traditional drying at high temperature in order to eliminate or decrease temperature effect on the overall quality of products.