Effects of Hydroxypropyl Methylcellulose Content and Drying Time on Qualities of <I>Aloe vera</I> Powder by Foam - mat Drying
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The objective of this study was to find out the levels of hydroxypropyl methylcellulose (HPMC: 1, 2, 3 and 4 %) and drying time (12, 16, 20 and 24 hrs) in order to develop the qualities of aloe vera powder by using foam - mat drying. The results showed that 1 % HPMC make the highest foaming overrun of aloe vera foam as 493.83 %. This foam was dried in trays and heat flowed easily to give the lowest moisture content as 4.91% and it provided the highest of antioxidant activity with 0.74 mg / g sample of trolox equivalent. The drying periods of 12 - 24 hrs were not significantly different to affect production yield in the range of 16.36 - 16.90 %. However, 16 - hr drying time was suitable for foam - mat drying process because it gave the moisture content under criteria of Thai Community Product Standard for dried mixed herbs as 6.69 %. Moreover, water solubility index (WSI) were not significantly different (P > 0.05) between 12 - and 16 - hr drying time drying time process and the values were 84.47 and 80.46 %, respectively.
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