Mempelajari Pengaruh Konsentrasi Ragi dalam Formulasi Inokulum Fermentasi dan lama Penyangraian terhadap Mutu Kopi Bubuk

Abstract

SIKTIEN SEPTIA: A Study on The Effect of Yeast Concentration in Formulation of Fermentation Inoculum and Roasting Time on the Quality of Ground Coffee. Supervided by Ir.Setyohadi,MSc and Dr.Ir.Herla Rusmarilin, MS. Indonesia is one of the biggest coffee produced in the world with many kinds of coffee such asa Robusta and Arabica, however production of luwak coffee is still minimum, so there is a need to do researches for large scale production,one of the way with used yeast concentration in formulation of fermentation on inoculum, with the quality and quantity as same as with luwak coffee. Four kinds yeast concentration, i.e.:5, 10, 15 and 20% and roasting time 10, 15, 20 and 25 minutes. The research was performed in March-May 2010 at the Laboratory of Food Technology, Faculty of Agriculture, North Sumatera University, Medan, using factorial completely randomized design. Parameters analysed were solubility content, caffeine content, organoleptic values of colour, flavour, taste and texture. The result showed that the yeast concentration had highly significant effet on organoleptic values of colour, flavour and taste, had significant effect on caffeine content and organoleptic values of texture and had no significant effect on solubility. The roasting time had highly significant effect on organoleptic values of colour, flavour and taste, had significant effect on caffeine content and had no significant effect on organoleptic value of texture and solubility content. The interaction of yeast concentration and roasting time had highly significant effect on organoleptic values of colour, had significant effect on organoleptic values of flavour and taste and had no significant effect on caffeine content, organoleptic value of texture and solubility content. The 15% yeast concentration and roasting time 20 minute gave the best quality of the ground coffee.