Drying an agricultural product with hot air (HA) method causes a long drying time and results in high specific drying energy consumption (SEC). The dried product has high shrinkage percentage and low rehydration. Therefore this research aims to develop dried shiitake mushroom using belt-conveyor combined microwave-hot air drying method (MHB). The shiitake mushroom was dried by MHB at microwave power of 300 W 400 W 500 W and 600 W and air temperature of 65 oC with air velocity of 0.3 m/s and recycled air of 80% and by the HA drying method at air temperature of 65 oC. The samples were dried until their final moisture content less than 11.1% dry basis. The drying kinetics SEC of drying process and quality of dried shiitake mushroom were evaluated. The quality of dried product was considered in terms of color shrinkage rehydration texture water activity and microstructure. The results showed that the shiitake mushroom drying using MHB gave higher drying rate than that of HA drying method leading to short drying time and resulting in low SEC. The drying rate of un-blanched shiitake mushroom was higher than that of blanched shiitake mushroom. Dried shiitake mushroom from MHB drying gave lower values in shrinkage percentages and hardness but higher rehydration and larger pore size than that dried by HA drying. However the color values (L* +a* and +b*) of dried shiitake mushroom in all cases were not significantly different. Meanwhile dried shiitake mushroom from un-blanched case gave lower values in shrinkage percentage and hardness but higher values in all colors and rehydration and larger pore size than those of blanched case.

The study of Crispy Lotus-Stem bakesby drying oven. The purpises of this study were to create create crispy lotus-stem recipe and the production process of crispy lotus-stem by drying oven. This study was to quantify amount of lotus-stem and Stabilizing agent that appropriate to produces crispy lotus-stem. Was conducted in 3 recipes (depend on ratio (%) of quantity lotus-stem: Stabilizing agent) are following 1) 95:5 2) 95:5 and 3) 95:5. Our study found that the ratio of lotus-stem: Tapiocastarch which appropriate to produces crispy lotus-stem were 95:5.Moreover this ratio was accepted mostly and after tasted the water activity aw values= 0.349the Crispyness values= 1753 and the Spectrophotometer values = (L*) 34.39(a*) 4.12 and (b*) 8.31 the chemical analysis found that fiber = 31.89% protein = 3.87% fat = 23.98% moisture = 2.65% and ash = 4.35% The study of temperature and duration to bake crispy lotus-stem by drying oven at 60 70 and 80 degree Our showed the appropriate temperature and duration to bake crispy lotus-stem by drying oven was 1 hour 30 minutes crispy Lotus-stem products by Drying Oven can Keep at room temperature degree Celsius for a period of 30 days.

The objectives of this research were to study the changes in the moisture of ground fish slices during drying with superheated steam combined with hot air and to compare the physical properties (in terms of color hardness toughness and shrinkage) as well as sensory evaluation of dried fish slices. Two drying methods were performed (i.e. superheated steam drying at 140 ?C combined with hot air drying at 110 ?C (SSD+HAD) and hot air drying at 110 ?C combined with superheated steam drying at 220 ?C and hot air drying at 110 ?C (HAD+SSD+HAD)). The ground fish samples were produced at sizes of 50?50?1.3 and50?50?2.2 mm (WDH). The samples with the initial moisture content of around 205-215% dry basis were dried until the final moisture content of about 20% dry basis. Results showed that the samples with 1.3 mm thickness had shorter drying times than those with 2.2 mm thickness. The samples dried by SSD+HAD and HAD+SSD+HAD were similar in the drying time. In term of qualities it was seen that the lightness of dried samples decreased but the hardness toughness and shrinkage percentage of dried samples increased when the samples thickness increased. Dried samples obtained from SSD+HAD had higher lightness hardness and toughness but had lower percentage of shrinkage than those obtained from HAD+SSD+HAD. Moreover it was found that dried samples obtained from HAD+SSD+HAD had the highest sensory scores.