1. Department of Chemistry, University of North Bengal, Darjeeling 734013, India
2. Nanobiology and Phytotherapy Laboratory, Department of Botany, University of North Bengal, Darjeeling 734013, India
3. Department of Chemistry, Malda College, Malda 732101, India
4. Department of Chemistry, University of Gour Banga, Malda 732103, India
5. Department of Biotechnology, University of North Bengal, Darjeeling 734013, India
6. Department of Chemistry, Alipurduar University, Alipurduar 736122, India
7. Vice-Chancellor, Alipurduar University, Alipurduar 736122, India