Concentrated glucose (50% W/V) and a mixture of decanoic and acetic acids were fed from two separate reservoirs. Different decanoic acid to acetic acid(DA:AA) ratios (55:45, 70:30, 85:15, 100:0 V/V) were prepared by heating decanoic acid in a hot water bath at 100◦C and then mixed with acetic acid at room temperature.