1. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran Jl. Raya Bandung-Sumedang Km. 21, Jatinangor45363, Indonesia
2. Department of Conservative Dentistry, Faculty of Dentistry, Universitas Padjadjaran Jl. Raya Bandung-Sumedang Km. 21, Jatinangor45363, Indonesia
3. Department of Oral Biology, Faculty of Dentistry, Universitas Padjadjaran Jl. Raya Bandung-Sumedang Km. 21, Jatinangor45363, Indonesia