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Solvent-Free Microwave Extraction: Phytochemistry and Bioactivities of Essential Oil from Stachytarpheta jamaicensis, L. in Banyuwangi Susanti, Yuni; Pambudi, Setyo; A'yun, Ayu Qurota; Aprilia, Melinda; Hanum, Nabila Salsabila; Armadan, Dwi Danang
Molekul Vol 20 No 3 (2025)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2025.20.3.16009

Abstract

ABSTRACT. Stachytarpheta jamaicensis, L. is a member of the Verbenaceae family. It is a medicinal plant easily found on vacant land and in rice fields in Banyuwangi. The present study is the first detail reported to examine the phytochemical compound and bioactivities of essential oil from S. jamaicensis L., using solvent-free microwave extraction (SFME). Forty chemical compounds were identified in the inflorescence and thirty in the leaves. β-caryophyllene, fulvoipolamiide, hexahydrofarnesyl acetone, t-phytol, neophytadiene, and squalene were identified in inflorescence oil. In contrast to the inflorescence, where these compounds were present in minor amounts, fulvoipolamiide, t-phytol, and squalene were the predominant components in the leaf oil. The IC50 values of leaves and inflorescence essential oils were 30.566 mg/mL and 52.510 mg/mL, respectively. Based on IC50 values, leaf essential oils have stronger antioxidant potential than inflorescence. Antibacterial and antifungal tests indicated that the leaf essential oil possesses greater antimicrobial efficacy than that of the inflorescence. These findings suggest that the essential oil of S. jamaicensis is a promising source of antioxidant, antibacterial, and antifungal agents, and holds potential for future pharmaceutical applications. Keywords: antibacterial; antifungal; antioxidant; medicinal plant
Evaluasi Sistem Dual Fuel Pertalite-LPG pada Mesin Bensin Konvensional: Dampak terhadap Konsumsi Pertalite dan Emisi Gas Buang pada Variasi Putaran Mesin Setiawan, Dodik Aris; Ansori, Lutfi Isa; Pater, Dewi Lusiana; Pambudi, Setyo; Setiawan, Habibie Perwira
GLOBAL: Jurnal Lentera BITEP Vol. 4 No. 01 (2026): Februari 2026
Publisher : Lentera Ilmu Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59422/global.v4i01.1142

Abstract

Penelitian ini bertujuan untuk mengevaluasi kinerja sistem dual fuel Pertalite–LPG dalam mengurangi konsumsi bahan bakar cair dan emisi gas buang pada mesin bensin konvensional. Penelitian menggunakan metode eksperimen laboratorium pada mesin bensin satu silinder dengan variasi putaran mesin 1000, 1500, 2000, dan 2500 RPM, di mana setiap kondisi pengujian dilakukan tiga kali pengulangan untuk memperoleh nilai rata-rata yang dapat direplikasi. Konsumsi bahan bakar cair diukur menggunakan buret ukur terkalibrasi, sedangkan emisi gas buang dianalisis menggunakan gas analyzer digital. Hasil penelitian menunjukkan bahwa penggunaan sistem dual fuel mampu menurunkan konsumsi Pertalite rata-rata sebesar 10–13% pada rentang putaran 1000–2000 RPM dibandingkan penggunaan bahan bakar tunggal, serta menurunkan emisi CO dan HC masing-masing sebesar 15–18%. Namun, pada putaran 2500 RPM pengaruh penghematan bahan bakar cenderung tidak signifikan. Temuan ini menunjukkan bahwa penerapan sistem dual fuel Pertalite-LPG lebih efektif pada kondisi operasi putaran rendah hingga menengah dan berpotensi menjadi alternatif bahan bakar yang lebih efisien dan ramah lingkungan.
Co-Authors A'yun, Ayu Qurota Aditya, Tsabit Agus Triono Al Hussein Flowers Rizqi Ansori, Lutfi Isa Aprilia, Melinda Armadan, Dwi Danang Astuti, Bernadeta S. Correia, Pascoal Fikri, Azhar Hanum, Nabila Salsabila Karisma, Muhamat Dwi Martadi, Martadi Mochamad Asrofi Muanayah, Nur Alfi Muh Nurkoyim Kustanto Murtadho, Nizam Alfi Nasrul Ilminnafik Okki Verdiansyah Pater, Dewi Lusiana Ramadhan, Dimas Roidelindho, Kiki Salahuddin Junus Setiawan, Dodik Aris Setiawan, Habibie Perwira Sholihah, Daimah SIMON BAMBANG WIDJANARKO Sri Ritawati Tsabit, Mumtadz Zaid Bin Utomo, Sigit Tri Yayu Romdhonah Yuni Susanti