1. Centre for Advanced Studies in Chemistry; North-Eastern Hill University; Shillong- 793 022 India
2. Department of Biotechnology and Center for Nanotechnology; Indian Institute of Technology Roorkee; Roorkee- 247667, Uttarakhand India
3. Department of Pharmacy; School of Applied Sciences; University of Huddersfield; Huddersfield - HD1 3DH UK