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All Journal Proceedings Series on Social Sciences & Humanities Musik Etnik Nusantara Makara Journal of Science Ekopedia: Jurnal Ilmiah Ekonomi
Dwi Wahyu Nugroho
University of Indonesia, Jakarta
Arts Economics, Econometrics & Finance 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
Perkembangan Garap Karawitan Ketoprak Laras Budoyo Wedarijaksa Kabupaten Pati Putra, Abid Afandi; Raditya, Bayu Enggar; Setyawan, Didik Ari; Nugroho, Dwi Wahyu; Saputra, Mahardika Dwi
Jurnal Musik Etnik Nusantara Vol 5, No 2 (2025): Jurnal Musik Etnik Nusantara
Publisher : Institut Seni Indonesia Padangpanjang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26887/jmen.v5i2.6104

Abstract

Ketoprak Laras Budoyo merupakan kelompok ketoprak di Pati yang mempertahankan bentuk pertunjukan tradisional dengan struktur sajian yang meliputi bonangan, uyon-uyon, pembuka, tari Gambyong, jejer keraton, gandrungan, perang, taman sari, dan dagelan. Musik menjadi elemen utama yang tidak hanya membangun suasana dramatik, tetapi juga mengatur alur dan menegaskan perubahan emosi dalam pementasan. Penelitian ini menggunakan metode kualitatif menurut Saryono, dengan pengumpulan data melalui studi pustaka dan wawancara terhadap para pemain, penggarap, dan pihak yang terlibat langsung dalam proses kreatif. Hasil penelitian menunjukkan bahwa perkembangan garap musik pada ketoprak Laras Budoyo terbagi ke dalam dua periode, yaitu periode 2017–2019 yang masih mengacu pada pakem tradisional dan mempertahankan struktur musikal yang baku, serta periode 2019–2024 yang mulai menunjukkan inovasi. Pada periode kedua, perubahan paling terlihat pada garap pembuka dan budhalan yang mulai mengadopsi pola garap wayang sehingga memberi nuansa musikal yang lebih dinamis. Unsur pembentuk garap yang mencakup materi garap, penggarap, sarana garap, dan penentu garap menjadi faktor penting yang memengaruhi arah perkembangan tersebut. Temuan ini memperlihatkan bagaimana Laras Budoyo mampu menjaga identitas tradisional sambil menyesuaikan bentuk musikalnya dengan tuntutan pertunjukan kontemporer.
Pengaruh Persepsi Manfaat, Persepsi Kemudahan Penggunaan dan Gaya Hidup Terhadap Minat Beli pada Motor Listrik Volta di Surakarta Nugroho, Dwi Wahyu; Pratita, Mutya Paramita
Ekopedia: Jurnal Ilmiah Ekonomi Vol. 2 No. 1 (2026): JANUARI-MARET
Publisher : Indo Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63822/gp0v0y87

Abstract

Electric motorcycles are an environmentally friendly and economical transportation solution in the face of energy scarcity and air pollution. However, there are indications of problems with consumer interest in PT Volta products in Surakarta. Referring to this urgency, this study examines the contribution of perceived benefits, perceived ease of use, and lifestyle in shaping customer purchasing interest. The main objective of this study is to identify and explain the influence of these three variables on the decision of potential consumers of Volta electric motorcycles in Surakarta. This study applies a quantitative approach by utilising primary data as the main source of information. Considering that the population of potential consumers of Volta electric motorcycles in Surakarta cannot be identified with certainty (unknown population), a sample size of 100 respondents was determined. Participants were selected using purposive sampling based on specific criteria. Data collection instruments were integrated through the distribution of questionnaires, literature studies, and field observations. Furthermore, the data were analysed using a series of statistical procedures, including instrument testing (validity and reliability), descriptive analysis, classical assumption testing, and multiple linear regression analysis to test the hypothesis through t-tests, F-tests, and the coefficient of determination (R2). Evaluation of the research instruments showed that all questionnaire items met the validity and reliability criteria. In addition, the model met the classical assumption requirements, as indicated by the absence of multicollinearity and heteroscedasticity, and had normally distributed residuals. The resulting regression model is presented through the following equation: Y = 4.830 + 0.733 X1 + 0.037 X2 + 0.044 X3 + e. Partially (t-test), the results show that only the variable of perceived ease of use has a significant effect on purchase intention. Conversely, the variables of perceived benefits and lifestyle did not show a statistically significant effect. However, simultaneously (F test), the F value of 33.793 with a significance of 0.000 < 0.05 confirmed that this model was suitable (goodness of fit) for predicting purchase intention. Based on the coefficient of determination test, the R2 value of 0.498 indicates that the contribution of independent variables to purchase intention is 49.8%, while the remaining 50.2% is explained by other factors outside the scope of this study
Co-Authors Daratika, Dyah Ayu Etik Mardliyati, Etik Kamila, Muthia Maulana, Syahrizal Nurul Taufiqu Rochman Pratita, Mutya Paramita Putra, Abid Afandi Raditya, Bayu Enggar Rifada, Mohammad Aulia Saputra, Mahardika Dwi Setyawan, Didik Ari SETYAWATI, DAMAI RIA Togatorop, Lusiana Wahyu Bambang Widayatno, Wahyu Bambang