Abstract:
Hal (Vateria copallifera) bark can be used to control sugar fermentation process by yeast. Therefore, it was subjected to sun, mechanical, shade and cooling with dehumidified (CD) drying processes in order to identify the best drying method. 1.5 g of dried bark from four drying processes were introduced into four, 40% sugar (sucrose) solutions to identify the best drying method in terms of froth formation. In addition, 1.5 g of hal bark was introduced into 30%, 40%, 50% and 60% sugar solutions to determine at what sugar concentration that hal bark is capable to control sugar fermentation. Moreover, 0.5, 1.0, 1.5, 2.0 and 3.0 g of bark from the best drying method were introduced into 50% sucrose solutions to determine the level that Hal bark can be incorporated into sugar solutions without changing the sugar taste. Finally, optimum level of Hal bark was introduced into 50% sugar solution and levels of reducing, non-reducing and total sugars against the control were monitored. Sugar solutions were inoculated with 1.0% yeast.
The best drying method was CD as it was capable to control sugar fermentation at 40% sugar level and others had it at 50% level. Sensory evaluation revealed that up to 1.0 g of hal bark can be incorporated into 100 ml of sugar solutions without disturbing to the sugar taste. While 1 g of hal bark was capable to control sugar fermentation at 50% sugar level, control had same performance at 60%. 1.2 g of Hal bark from the best drying method in 50% sugar solution was capable to maintain reducing, non-reducing and total sugars unchanged against the control.
