You can perform such assay at any university or research institution where researchers are working on Probiotics. Institutions in India are NIN, Hyderabad; CFTRI, Mysore; DFRL, Mysore, Bangalore University, Hyderabad Central University; Delhi University; Pondicherry Central University, Banaras Hindu University and much more etc. You need to ask them whether they can collaborate or provide you facilities to you.