1 Regina Tutik Padmaningrum, Jurdik Kimia, FMIPA, UNY, e-mail:[email protected] 2 Regina Tutik Padmaningrum, Jurdik Kimia, FMIPA, UNY, e-mail:[email protected] 3 Regina Tutik Padmaningrum, Jurdik Kimia, FMIPA, UNY, e-mail:[email protected] 4 Regina Tutik Padmaningrum, Jurdik Kimia, FMIPA, UNY, e-mail:[email protected] 5 Regina Tutik Padmaningrum, Jurdik Kimia, FMIPA, UNY, e-mail:[email protected] 6 Regina Tutik Padmaningrum, Jurdik Kimia, FMIPA, UNY, e-mail:[email protected] 7 Regina Tutik Padmaningrum, Jurdik Kimia, FMIPA, UNY, e-mail:[email protected]