This activity is presented to handle waste as well as to improve  public health by utilizing medicinal raw materials that have not been used optimally by the community into food or beverages that are pleasant to consume. This service was carried out in Gegelang Village, Lingsar District, West Lombok, in collaboration with the local village PKK driving team. The target of this service is the village community, especially mothers who are the heart of the family who serve food in the middle of the family every day.  This service was carried out in the early months of February 2022. Community service received a positive response from the community, as evidenced by a high level of satisfaction. Furthermore, this service activity succeeded in inviting the community to use mangosteen peel extract for food additives.

Momordica charantia L seed is classified as the domestic waste even though it has many health benefits, namely as anti-tumor, anti-virus, and as a medicine to increase the body resistance. Therefore, this study was designed to examine the antioxidant activity of the ethanol extract of the seeds using the DPPH method. Furthermore, a GC-MS analysis will be carried out to determine the chemical compounds that play a role in the bioactivity. Based on the absorbance of DPPH in three repetitions, the average value of DPPH inhibition by 95% ethanol extract of bitter melon seeds was 60.45%, in which classified as a good radical absorbance. The GC-MS results showed that the ethanol extract of bitter melon seeds contained ten chemical compounds consisting of sesquiterpenes, fatty acids, and alkanes, which affecting the radical absorbance of M. charantia extract.

Momordica charantia, commonly called bitter melon, is a plant belonging to Cucurbitaceae family known for centuries for its nutritional properties. This plant have been used as folklore medicine for the management of hypertensions, cold, cough, and diabetes. The aim of the present study was to characterize the chemical constituents of ripe M. charantia from Lombok, Indonesia by Gas Chromatography Mass Spectrometry (GCMS). The method that used is maseration with ethanol as solvent. The ethanol extract of ripe M. charantia was characterized by gas chromatography-flame ionization detection and gas chromatography coupled with mass spectrometry analyses. The chemical constituent of ripe M. charantia that followed by GCMS were 2,4-Pentanediol (23,61 %), Eucalyptol (1,8-Cineole) (20,41 %), Trans (Beta)-Caryopyllene (10,07 %), 3-Decyn-2-ol  (9.54 %), Epiglobulol (7.82 %), Methyleugenol (7.15%), Beta-Selinene (5.80 %), Alpha-Selinene (5.43 %), and Alpha-Humulene (5.29 %). This is the first report on chemical screening of ethanol extract of ripe M. charantia and GC-MS analysis shows the presence of compounds which have medicinal properties.