Pustaka Ilmiah Universitas Padjadjaran

Abstrak

A Content Of Alcohol Of Fermentations Process In Making Black Tape Ketan On Different Fermentations Time By Means Specific Gravity, Refractive Index And Gc-ms Methods

The determining of alcohol contents of fermentations process in making black tape ketan on different fermentations time by means specific gravity, refractive index and GC-MS methods had been carried out. The results of determination of alcohol contents with specific gravity methods at 3, 10, 17, 24, and 31 day fermentations time were 3.17 % v/v; 3.02 % v/v; 3.63 % v/v; 3.12 % v/v; and 4.47 % v/v, respectively, with recovery 82 %. Determination of alcohol contents with refractive index methods at 3, 10, 17, 24, and 31 day fermentations time were 3.90 % v/v; 3.69 % v/v; 4.31 % v/v; 3.80 % v/v; and 5.04 % v/v, respectively, with recovery 88 %. Determination of alcohol contents with GC-MS methods at 3, 10, 17, 24, and 31 day fermentations time were 3.99 % v/v; 4.20 % v/v; 4.42 % v/v; 5.23 % v/v; and 5.30 % v/v, respectively, with recovery 95 %. The length of fermentations time obviously did not influence the produce of alcohol contents.