1. Department of Chemistry, University of North Bengal, Darjeeling 734013, India
2. Department of Chemistry, Government General Degree College at Kushmandi, Dakshin Dinajpur 733125, India
3. Department of Botany, University of North Bengal, Darjeeling 734013, India
4. CSIR Central Salt and Marine Chemical Research Institute, G. B. Marg Bhavnagar, Gujrat 364002, India
5. A. P. C. Roy Government College Matigara, Siliguri, Darjeeling 734010, India
6. Defence Bioengineering and Electromedical Laboratory, C. V. Raman Nagar, Bangalore 560093, India