1. Faculty of Applied Science and Education, Universitas Pendidikan Mandalika, Jl. Pemuda No. 59A, Mataram 83126, Indonesia
2. Faculty of Integrated Technologies, Universiti Brunei Darussalam, Gadong BE1410, Brunei
3. Department of Chemistry, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Bandar Seri Begawan BE1410, Brunei
4. Faculty of Forestry, Lambung Mangkurat University, Jl. A. Yani KM. 36, Banjarbaru 70714, Indonesia