Purba, Greace Enita, Department of Biology, Faculty of Mathematics and Natural Sciences, State University of Medan (Indonesia)
Purba, Jamalum, Department of Chemistry, Faculty of Mathematics and Sciences, Universitas Negeri Medan, Medan, Indonesia (Indonesia)
Purwanti, Rizka, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Padang State University, Padang (Indonesia)
Putra, Ananda, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang (Indonesia)
Putra, Ananta Adita Eka, Departement of Chemistry, Faculty of Mathematics and Natural Science, State University of Surabaya, Surabaya 60231, Indonesia (Indonesia)

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