PENGARUH PENAMBAHAN IMPURITAS TERHADAP PUTARAN OPTIK MINYAK JAHE (Effect Of Addition Of Round Optical Impurity Ginger Oil)

Abstract

Indonesia is one of the five major exporting countries in the world of ginger. Indonesia's export commodities ginger will increase an average of 32.75% per year. 2002 data show the export volume reached 43,193 tons of ginger (BPS 2002). Exports in the form of processed ginger (ginger oil, ginger oleoresin) is still small. Ginger oil export data only 0.4% of total exports of essential oils Indonesia (Hadipoentyanti, 2005). This relates to the lack of compliance with quality standards specified in international standards. As a result, often found some indication of impurity additions on the ginger oil. Efforts to determine the effect size of the dissolved impurity levels with ginger oil and its effect on optical rotation of ginger oil is by using a polarimeter. Polarimeter with the principle of light polarization properties of light is moving oscillasi and toward a certain direction. Round is a magnitude of the playing field of optical polarization of a substance or incident angle of polarized light is rotated by a layer of oil and its value is expressed in degrees of rotation. Optical rotation can be determined using a polarimeter. Practicum polarimeter uses WXG-4 polarimeter type, and the materials used are ginger oil with impurity of kerosene and VCO. This lab using the variable control of ginger oil volume is 10 ml to tube A and B. Independent variables used were the volume of the addition of kerosene and VCO, for each of the tubes A and B variable (1A-5A) 0 ml, 1 ml, 2 ml, 3 ml and 4 ml. In this lab can be concluded that the magnitude of optical rotation effect on the impurity in the oil of ginger. The greater the purity level of the optical rotation of oil is getting smaller. The addition of kerosene and VCO causing the greater magnitude of optical rotation. At variable 1A-5A-5o optical rotation, +3 °, +4 °, +5 °, +6 ° and the variable optical rotation 1B-5B -5 °, +2 °, +3 °, +4 °, + 5 °. Changes in optical rotation is in line to follow the linear equation y = x + 2 and R ² = 1. Key words: Polarization, Ginger Oil, Kerosene, VCO