During the microwave drying process, thermal energy within the moist materials is converted from microwave energy, which is used for water evaporation. Local temperature may then increase above the boiling temperature of water (Zhang et al., 2006). Moreover, higher internal pressure is also generated, leading to an increase in the dried material’s temperature. Higher microwave power results in higher temperature (Wojdyło et al., 2013). Therefore, the degradation of carotenoid could be explained by increasing in temperature due to applying high microwave power.
3.6 Comparison of different drying methods
It is desirable to investigate the effects of different drying methods on the quality of the dried Gac aril powder products. Table 3 shows the quality of the Gac aril powder produced from different drying methods, including air, freeze and microwave drying, in relation to colour and the content of lycopene and β-carotene. Statistical results showed that the colour and carotenoid content of the Gac aril powder were significantly affected by different drying methods (P < 0.001).
© 2014 Agro-Industry, Chiang Mai University
During the microwave drying process, thermal energy within the moist materials is converted from microwave energy, which is used for water evaporation. Local temperature may then increase above the boiling temperature of water (Zhang et al., 2006). Moreover, higher internal pressure is also generated, leading to an increase in the dried material’s temperature. Higher microwave power results in higher temperature (Wojdyło et al., 2013). Therefore, the degradation of carotenoid could be explained by increasing in temperature due to applying high microwave power.3.6 Comparison of different drying methodsIt is desirable to investigate the effects of different drying methods on the quality of the dried Gac aril powder products. Table 3 shows the quality of the Gac aril powder produced from different drying methods, including air, freeze and microwave drying, in relation to colour and the content of lycopene and β-carotene. Statistical results showed that the colour and carotenoid content of the Gac aril powder were significantly affected by different drying methods (P < 0.001).© 2014 Agro-Industry, Chiang Mai University
การแปล กรุณารอสักครู่..
