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All Journal BIOEDUSAINS: Jurnal Pendidikan Biologi dan Sains
Wayan Erly Sintya Dewi, Ni
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Aktivitas Antioksidan pada Ekstrak Limbah Kulit, Biji, dan Ampas Jeruk Siam Kintamani (Citrus nobilis et reticulata) dengan Pelarut Metanol Dewi, Ni Kadek Novia Puspita; Permatananda, Pande Ayu Naya Kasih; Udiyani, Desak Putu Citra; Nita Cahyawati, Putu; Wayan Erly Sintya Dewi, Ni
BIOEDUSAINS:Jurnal Pendidikan Biologi dan Sains Vol. 8 No. 5 (2025): Bioedusains: Jurnal Pendidikan Biologi dan Sains
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/2erqy756

Abstract

This study aims to analyze the antioxidant activity of waste extracts from the peel, seeds, and pulp of Kintamani tangerines and to implement a practical approach to by-product management based on a zero-waste system. The method used is a pure experimental study with a post-test only design. Extraction was carried out through repeated maceration using methanol as a solvent. Antioxidant activity was tested using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method and analyzed with a UV-Vis spectrophotometer at a wavelength of 517 nm. The results showed that the peel extract of Kintamani tangerines could fade the purple color of the DPPH solution, whereas the seed and pulp extracts did not show a significant change. The IC50 values were 136.17 ppm for the peel extract, 6727.86 ppm for the seed extract, and 497.57 ppm for the pulp extract. In conclusion, the peel extract of Kintamani  tangerines exhibited the highest antioxidant activity among the three extracts, categorized as moderate based on Blois' classification.   Keywords: Antioxidant Activity, Pulp, Kintamani Tangerine, Seed, DPPH, Peel
Co-Authors Dewi, Ni Kadek Novia Puspita Nita Cahyawati, Putu Pande Ayu Naya Kasih Permatananda Udiyani, Desak Putu Citra