臺灣國際科展

Recovering bioethanol from fruit wastes

科展類別
臺灣國際科展作品
屆次
2011年
科別
化學
得獎情形
三等獎
學校名稱
P. Kartal Doga
作者
Bahadir Osmanoglu Cansin Yollar

摘要或動機

1. Purpose of the research: Recovering bioethanol from fruit wastes by using brewing yeast and enzyme Viscozyme L\r
2. Procedures: Four different experiments were conducted in our project.\r
Experiment-1: Samples in RM by the addition of only S.Cerevisia.\r
Experiment-2: Samples in RM broth meduim by the addtion of 100 μl/g ViscozymeL and S. Cerevisiae\r
Experiment-3 : ViscozymeL with different concentration\r
Experiment-4: to determenine whether the enzyme with high concentration inhibited the fermentation.\r
Analysis of ethanol: HPLC method was used for the analysis;\r
HPLC method: (high performance liquid chromatography)\r
3. Data\r
HPLC measured initial and final concentrations of glucose and ethanol by the addtion of S. Cerevisiae.\r
Initial glucose concentration and final ethanol concentration was the highest in Grape pulp 12 and 9 g/L respectively. Despite the glucose concentration was the lowest, the ethanol concentration was quite high (7 g/L) in the mixture with orange. The lowest ethanol was produced in the mixture with pomegranate.\r
Concentrations of ethanol and glucose from the samples in RM broth meduim by the addtion of 100 μl/g ViscozymeL and S. Cerevisiae\r
After the 24 hour incubation by the addition of enzyme glucose concentration incresed by 1, 4 and 2 respectively in sample 1, 2 and 3. The ethanol concentrations in comparison to first experiment were higher especially in the sample1 (grape pulp).\r
Effect of ViscozymeL with different concentration on glucose production.\r
The glucose concentration generally increased by the addition of 200 micro L of enzyme as the time proceeded. In grape pulp sample glucose concentartion didnt increased by the addition of 500 micro L enzyme.\r
The remaning glucose and produced ethanol concentrations by the addition of viscozyme L with two different concentartion and S. Cerevisiae\r
As the concentartion of enzyme added incresed the amout of ethanol also inreased in sample 2 and 3 but in the sample 3 the fermentation was inhibited.\r
4. Conclusions\r
In this study sugars in fruit wastes that are regularly not recylecled were fermented successfully into ethanol by using S. Cerevisiae.\r
Generally we get more ethanol from the samples when the enzyme was used. As the graph5 shows the ethanol concentration generally increased as the enzyme concentration increased. But especially in the sample1 (mixture with pomegranate) at 200 and 500 micro liter concentrations, ethanol production were 2 and 0 g/L respectively. In the light of this daha we conluded that the enzyme with high concentartion might inhibit the fermentation. When the activity of enzyme was inhibited by keeping the pretreated enzyme in boiling water, the fermentation restarted and recovered more ethanol; 8 and 12 g/L at the enzyme concentration of 200 and 500 microliter respectively.


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