Currently, the potential utilization of fruits and vegetable waste as a source of micronutrients and antioxidants has increased. The present study, therefore, aimed to determine the antimicrobial and anti-inflammatory activities of Citrus nobilis peel extract. A modified solvent evaporation technique was employed for peel extract preparation. For effective utilization of the natural product, quantitative analysis of phenolic compounds was carried out using liquid chromatography and mass spectroscopy technique. Phenolic and flavonoids were present in high amounts, while β-carotene and lycopene were present in vestigial amounts. The antimicrobial efficiency of peel extract was evaluated against four bacterial strains including Staphylococcus aureus (MTCC 3160), Klebsiella pneumoniae (MTCC 3384), Pseudomonas aeruginosa (MTCC 2295), and Salmonella typhimurium (MTCC 1254), and one fungal strain Candida albicans (MTCC 183), and zone of inhibition was comparable to the positive control streptomycin and amphotericin B, respectively. The extract of Citrus nobilis peels showed effective anti-inflammatory activity during human red blood cell membrane stabilization (HRBC) and albumin denaturation assay. The extracts also exhibited 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity ranging from 53.46 to 81.13%. Therefore, the obtained results suggest that Citrus nobilis peel could be used as an excellent source of polyphenols and transformed into value-added products.

Gastrointestinal, skin, pulmonary and cardiovascular problems have been reported all over the world on massive scale. The treatment of these problems has become tough due to genetically modified bacterial strains and fungal infections. The present studied was conducted to evaluate the antimicrobial activities of Citrullus colocynthis plant extract. The ethanolic extract of dried fruit pulp, seed, and root was evaluated with respect to anti-bacterial and anti-fungal properties. The anti-microbial profile studied against four bacterial strains (2 Gram negative and 2 Gram positive) while anti-fungal profile studied against four fungal species. All the bacterial and fungal strains used in the study showed sensitivities against the respective extracts. The zones of inhibition ranged between 7 mm to 23 mm, and 6 mm to 23 mm in against bacterial and fungal strains, respectively. The extract of seed found to be less effective against both the organisms. It was suggested from our study that the extract of Citrullus colocynthis may be used in medicines to cure bacterial diseases.