Impact of Growing Location on Kakadu Plum Fruit Composition and In Vitro Bioactivity as Determinants of Its Nutraceutical Potential

Author:

Bobasa Eshetu M.,Akter SalehaORCID,Phan Anh Dao ThiORCID,Netzel Michael E.ORCID,Cozzolino DanielORCID,Osborne Simone,Sultanbawa YasminaORCID

Abstract

Growing location is known to affect the metabolite content and functionality of wild harvested fruits. Terminalia ferdinandiana, commonly known as Kakadu plum (KP), is among the most commercially important native Australian bush foods. Therefore, we evaluated the composition and in vitro bioactivity of aqueous acidified ethanol (AAE) and water extracts prepared from KP fruit wild harvested in the Northern Territory (NT) and Western Australia (WA). Compositional analysis included vitamin C, total ellagic acid (TEA), and total phenolic content (TPC), while in vitro bioactivity was assessed through anti-inflammatory (RAW 264.7 macrophages) activity and cell viability (Hep G2) assay. The IC50 of the extracts ranged from 33.3 to 166.3 µg/mL for NO inhibition and CC50 from 1676 to 7337 µg/mL for Hep G2 cell viability inhibition. The AAE KP fruit extracts from the NT exhibited potent anti-inflammatory activity and impacted Hep G2 cell viability more than other extracts, most likely due to TEA (3189 mg/100 g dry weight (DW)), vitamin C (180.5 mg/g DW) and TPC (196 mg GAE/g DW) being higher than in any other extract. Overall, the findings of the present study are promising for using KP fruit and derived products in functional foods, nutraceuticals, or dietary supplements.

Funder

Cooperative Research Centre for Developing Northern Australia

Western Australian, Northern Territory and Queensland Governments

Australian Research Council (ARC) Industrial Transformation Training Centre

Publisher

MDPI AG

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