Performance evaluation of banaba (Lagerstroemia speciosa (L.) Pers.) leaf extract spray drying
2010
Castañeda-Tanquilut, M.R. | Elauria, J.C., Philippines Univ. Los Baños, College, Laguna (Philippines). Inst. of Agricultural Engineering | Peralta, E.K., Philippines Univ. Los Baños, College, Laguna (Philippines). Coll. of Engineering and Agro-Industrial Technology | Tanquilut, N.C., Pampanga Agricultural Coll., Magalang, Pampanga (Philippines). Inst. of Engineering and Computer Studies
Process variables affecting the spray drying attributes of liquid extract from complete banaba extract were investigated. The levels of the process variables namely pump speed, air inlet temperature and decoction ratio were incorporated into a Box-BehnKen incomplete factorial experiment. Dependent variables were drying capacity, recovery rate and product moisture content. Pump speed and air inlet temperature significantly affected product moisture content and recovery rate. Drying capacity was significantly affected by pump speed and decoction ratio. A set of criteria namely, the highest drying capacity, less or equal to 10% product moisture content and maximum product recovery rate was considered for the rehydration and organoleptic characteristics of spray dried banaba powder. Decoction ratios of 1:7 (1 g leaves to 7 g water) and 1:3, respectively at 13,000 rpm pump speed and 120 deg C inlet temperature, satisfied the said criteria. However, with these two treatments, the resulting spray dried powder samples rated poor in terms of sinkability and dispensibility, although these exhibited good solubility and were not significantly different in their rehydration and organoleptic characteristics. The system's thermal energy loss during spray drying was 1,208.57 kJ/ha, using the mass and energy balance equations which indicates an efficient drying system.
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