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All Journal Proceedings Series on Social Sciences & Humanities Makara Journal of Science
Dwi Wahyu Nugroho
University of Indonesia, Jakarta
Environmental Science Law, Crime, Criminology & Criminal Justice Social Sciences

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Effect of Mechanical Milling on the Total Phenolic Content and Antioxidant Activity of Garcinia mangostana Pericarp Nugroho, Dwi Wahyu; Daratika, Dyah Ayu; Kamila, Muthia; Togatorop, Lusiana; Rifada, Mohammad Aulia; Widayatno, Wahyu Bambang; Maulana, Syahrizal; Setyawati, Damai Ria; Mardliyati, Etik; Rochman, Nurul Taufiqu
Makara Journal of Science Vol. 24, No. 2
Publisher : UI Scholars Hub

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Abstract

This study aimed to identify the effect of mechanical milling on the total phenolic content and antioxidant activity of mangosteen pericarp. Mangosteen pericarp was milled under different milling times (30, 90, 150, and 210 min). The particle morphology before and after milling was observed by scanning electron microscopy (SEM), and the average particle size was obtained from SEM images and analyzed statistically. The antioxidant activity was measured through the 2,2-diphenyl-1-picrylhydrazyl method. The total phenolic content for the non-milling sample was 14.52 × 104 µg GAE/g sample, and the highest total phenol content was 17.44 × 104 µg GAE/g sample for the sample milled for 210 min. The IC50 value decreased for samples with milling 150 and 210 min, which showed strong antioxidant activity, whereas the value of gallic acid equivalent increased. SEM observations showed the presence of agglomeration in the morphology of mangosteen pericarp samples. The average particle size of the mangosteen pericarp decreased as the milling time increased (up to 4499 nm for samples milled for 210 min). Therefore, mechanical milling had a significant effect on the phenolic content and antioxidant activity, which indicated an increase in the bioavailability of mangosteen pericarp.
Analisis Dampak Sistem Presidential Threshold dalam Pemilihan Presiden dan Wakil Presiden di Indonesia Terhadap Inklusivitas Politik dan Representasi Demokratis Nugroho, Dwi Wahyu
Proceedings Series on Social Sciences & Humanities Vol. 17 (2024): Proceedings of Seminar International Legal Development in Twenty-First Century Era
Publisher : UM Purwokerto Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/pssh.v17i.1131

Abstract

Article 222 of Law Number 17 of 2017 concerning Presidential and Vice Presidential Elections states that "Candidate pairs are proposed by political parties or combinations of political parties participating in the election who meet the requirements to obtain seats of at least 20% of the total number of seats in the DPR or obtain 25% of the valid national votes in election of members of the DPR. With these regulations there are inconsistencies, on the one hand this country adheres to democracy, but on the other hand there are restrictions on the rights of citizens who wish to run for president and/or vice president. Research on the presidential threshold system is important to understand its impact on the political system and democracy in Indonesia. So that we can understand how this system influences community political participation, the diversity of presidential and vice presidential candidates, and the representation of community interests. The method used is normative legal research. These provisions reduce political inclusivity by limiting the variety of options for voters and restricting access for various groups of society. And influence democratic representation by suppressing votes for minority candidates or those representing special interests.
Co-Authors Daratika, Dyah Ayu Etik Mardliyati, Etik Kamila, Muthia Maulana, Syahrizal Nurul Taufiqu Rochman Rifada, Mohammad Aulia SETYAWATI, DAMAI RIA Togatorop, Lusiana Wahyu Bambang Widayatno, Wahyu Bambang