Extraction of bioactive compounds from Psidium guajava leaves and its utilization in preparation of jellies oleh N. S. Sampath Kumar, Norizah Mhd Sarbon, Sandeep Singh Rana, Anjani Devi Chintagunta, S. Prathibha, Satheesh Kumar Ingilala, S. P. Jeevan Kumar, B. Sai Anvesh, Vijaya Ramu Dirisala