1. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Jenderal Achmad Yani, University, Cimahi 40528, Indonesia.
2. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia.
3. Central Laboratory of Universitas Padjadjaran, Jatinangor 45363, Indonesia.
4. Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan.