Title:Application of Microwave and Ultrasonication for Anthocyanin Extraction
Process from Garcinia indica Choisy Fruit Waste and Assessment of
Antioxidant Activity using Caenorhabditis elegans Model
Volume: 19
Issue: 7
Author(s): Rajesh Padumane Shastry*Srinath Boreddihalli Sriramareddy
Affiliation:
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to be University), University
Road, Deralakatte, Mangalore-575018, India
Keywords:
Garcinia indica, anthocyanin, ultrasonication, microwave, antioxidant activity, response surface methodology.
Abstract: Garcinia indica (also known as kokum) is a small evergreen tree that has been used in a
variety of culinary, industrial, and pharmacological products, as well as fruit juices and food. In the
present study, the antioxidant capacity of anthocyanin extracted from Garcinia indica fruit waste
was assessed using DPPH, ABTS assay, and a Caenorhabditis elegans infection model. The
independent variables, such as temperature, solvent concentration, microwave exposure, and
exposure to ultrasonication were integrated as independent variables in a five-level central
composite design using response surface methodology. Based on statistical analysis, the generated
models were successfully utilised to analyse the experimental data and determine the best
extraction conditions. The rescue effect of anthocyanin was further studied using a paralysis and
killing assay in a C. elegans infection model. The extraction yield was 21.0 mg/g under these
conditions, with antioxidant activity of 9.9 μg/ml by ABTS assay and 6.6 μg/ml by DPPH assay,
respectively. Furthermore, as compared to ethanol leaching extraction, this experimental design
increased anthocyanin yield by more than 15 fold. The treatment of anthocyanin with C. elegans
from E. coli and Pseudomonas aeruginosa PAO1 infection resulted in a significantly longer
lifetime. Garcinia indica fruit waste extracts high in anthocyanins might be employed as natural
food colorants and antioxidant additives in food products.