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7211048 
Journal Article 
Nutritional Value and Antimicrobial Activity of Pittosporum angustifolium (Gumby Gumby), an Australian Indigenous Plant 
Phan, AnhDaoThi; Chaliha, M; Hong, HT; Tinggi, U; Netzel, ME; Sultanbawa, Y; , 
2020 
Foods
ISSN: 2304-8158 
MDPI 
BASEL 
32640660 
WOS:000558215200001 
The indigenous endemic plantP. angustifoliumhas received attention for nutraceutical and therapeutic applications in Australia. This study investigates for the first time the nutritional value (macro- and micronutrients, minerals, trace elements, polyphenols, carotenoids, saponins and antioxidant capacity) and antimicrobial activity of different botanical parts of P. angustifolium, either collected from the wild or cultivated. Different botanical tissues, geographic location and growing condition (wild vs. cultivated) showed significant (p<0.05) effects on the tested bioactive compounds, with the leaves having significantly (p<0.05) higher levels than the stems. Saponins and polyphenols could be identified as the main bioactive compounds in the leaves with up to 4% per dry weight. The extracts ofP. angustifoliumleaves and stems showed strong antioxidant and antimicrobial activities, especially againstCandida albicans. These activities correlated (R-2=0.64-0.92;p<0.05) with the levels of polyphenols and saponins, indicating their biologic potential. Findings from this study may provide information for future applications ofP. angustifoliumin the functional ingredient or nutraceutical industry.