**4. Conclusions**

The green plum has considerable antimicrobial activity in its flesh, the water extraction caused bacterial cell deformation and disintegration. The radical scavenging activity is high particularly in the flesh. These activities may be the result of a number of the phytochemicals found in its flesh and seed including gallic acid, ellagic acid, p-coumaric acid, kaempferol, trans-ferulic acid and quercetin. The seed was also found to contain anthocyanins that have ye<sup>t</sup> to be identified completely. The green plum is an Australian native fruit that has potential for use as a food preservative and further investigation into these uses is justified.

**Author Contributions:** Y.S. conceived and designed the experiments; S.F. performed the extractions and experiments; M.N. designed the phytochemical analysis; G.N. performed the phytochemical analysis; S.F. and G.N. analyzed the data; Y.S. contributed reagents/materials/analysis tools; S.F. wrote the paper and Y.S., G.N. and M.N. checked and edited it.

**Acknowledgments:** We thank Chris Brady and the Thamarrurr Rangers from the Northern Territory for assisting in collecting the green plum fruit, and Kathryn Green at the Centre for Microscopy and Microanalysis, The University of Queensland, for taking the SEM images. Funding for this project was from The University of Queensland, Brisbane, Australia. Selina Fyfe's Ph.D. is supported by an Australian Government Research Training Program Scholarship.

**Conflicts of Interest:** The authors declare no conflict of interest.
