fulltext.study @t Gmail

Changes in physico-chemical and functional properties during convective drying of aloe vera (Aloe barbadensis) leaves

Paper ID Volume ID Publish Year Pages File Format Full-Text
19530 43073 2010 4 PDF Available
Title
Changes in physico-chemical and functional properties during convective drying of aloe vera (Aloe barbadensis) leaves
Abstract

Aloe vera leaves were dried at different temperatures in hot air oven and powdered. The percent powder yield was found 2.60%, 2.60%, 2.55% and 2.52% at 50, 60, 70 and 80 °C respectively. Powder samples had the pH (1% solution) 3.51, 3.53, 3.52 and 3.53 with the rise of drying temperature in the selected range. Statistically, yield and pH indicated no significant difference (p < 0.5) due to drying temperature variation. Wettability of powder at 70 °C was 32 s as compared to 35, 35 and 37 s in the samples obtained at 50, 60 and 80 °C respectively. Water absorption capacity of powder at 70 °C was 359% as compare to 351%, 354% and 356% of 50, 60, and 80 °C powder samples. The HPLC chromatogram obtained for the sample dried at 80 °C shows that as the temperature increased from 50 to 80 °C, aloin content decreased from 10.6 to 1.7 ppm. The “a” values were found 2.028, 2.226, −0.282 and 2.531 for the samples obtained after drying at 50, 60, 70 and 80 °C respectively. Samples obtained at 70 °C showed negative “a” value indicated that the sample was more greenish in colour as compared to other samples.

Keywords
Aloe vera; Drying; Physico-chemical properties; HPLC; Aloin
First Page Preview
Changes in physico-chemical and functional properties during convective drying of aloe vera (Aloe barbadensis) leaves
Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 88, Issues 2–3, June–September 2010, Pages 161–164
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering