**5. Conclusions**

In summary, this study revealed the antioxidant potential of *D. indum* fruit exerted by various extracts and fractions from the different fruit parts. The fruit contains phenolics, amino acids, saccharides, fatty acids, sesquiterpene, polyols, and dicarboxylic acids that collectively contribute to its good antioxidant properties. A combination of fractionation by column chromatography, TLC bioautography, and GC-MS facilitated the identification of thirteen phenolic antioxidants in the exocarp of *D. indum* fruit for the first time. In a nutshell, *D. indum* fruit is a good natural antioxidant source that has grea<sup>t</sup> potential for further research and development for pharmaceutical, nutraceutical, and cosmeceutical applications.

**Supplementary Materials:** The following are available online at http://www.mdpi.com/2076-3921/7/11/154/s1, Table S1: Condition parameters for GC optimization, Table S2: Mass spectra data of metabolites identified in SMF and EDF, Figure S1: TLC antioxidant bioautograms of EDF subfractions (Di-1–Di-26) sprayed with 0.4 mM DPPH in methanol.

**Author Contributions:** M.F.O., N.M.H., and A.K. designed the experiment. S.M.T. revised the statistical analyses performed. M.F.O. carried out the experiments, analyzed the data, and prepared the manuscript. N.M.H. reviewed and corrected the manuscript. All authors approved the final manuscript.

**Funding:** International Islamic University Malaysia (IIUM) is acknowledged for the gran<sup>t</sup> (RIGS16-123-0287) awarded to support the publication of this work.

**Acknowledgments:** Special thanks go to the Kulliyyah of Pharmacy, Kulliyyah of Science, and the Integrated Centre for Research Animal Care and Use, International Islamic University Malaysia Kuantan, for the provision of facilities used throughout this study.

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