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All Journal JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI
Anak Agung Made Dewi Anggreni
Universitas Udayana
Agriculture, Biological Sciences & Forestry Chemistry Immunology & microbiology Industrial & Manufacturing Engineering

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Karakteristik Ekstrak Daun Bidara (Ziziphus mauritina L.) Pada Perlakuan Ukuran Partikel Dan Suhu Ekstraksi Elisabet Agustina Sihite; Ni Made Wartini; Anak Agung Made Dewi Anggreni
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 14 No 3 (2026): September
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRMA.2026.v14.03.p01

Abstract

Bidara leaf (Ziziphus mauritiana L.) are a rich source of bioactive compounds, including flavonoids, alkaloids, tannins, phenolics, and saponins, which exhibit antioxidant and surfactant properties. re a source of bioactive compounds such as flavonoids, alkaloids, tannins, phenols, and saponins that act as antioxidants and surfactants. This study aims to determine the effect of particle size and extraction temperature on the characteristics of bidara leaf extract as a source of saponins and to determine the best particle size and extraction temperature to produce bidara leaf extract as a source of saponins. Extraction was carried out using the maceration method with 86% methanol solvent for 48 hours. The study was designed using a factorial Randomized Block Design with two factors, namely particle size (40, 60, and 80 mesh) and extraction temperature (40°C, 50°C, and 60°C). The variables observed included yield, crude saponin content, foam height, and antioxidant capacity. Analysis was carried out using variance analysis and further Duncan's Multiple Range Test. The results showed that particle size and extraction temperature significantly affected all variables, while antioxidant capacity was significantly influenced by the interaction of the two factors. The results of the effectiveness index test showed that the combination of 80 mesh particle size and 40°C extraction temperature was the best treatment to produce bidara leaf extract with characteristics of 18.44% yield, 34.04% saponin content, 34.83 mm foam height, and 3.71 mg GAEAC/g antioxidant capacity.
Studi Ketahanan Matriks Alginat-IS258 Diperkuat Polyvinil Alcohol Dalam Memproduksi Bioetanol Dari Analog Nira Kelapa Facetarian Indah Dakhi; I Made Mahaputra Wijaya; Ida Bagus Wayan Gunam; Anak Agung Made Dewi Anggreni; Amna Hartiati; Wildan Khalid; Hidayat Taufik; Ainun Rofiq
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 14 No 3 (2026): September
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRMA.2026.v14.03.p11

Abstract

The growing demand for energy is driving the development of environmentally friendly alternative energy sources, one of which is bioethanol. Bioethanol can be produced through the fermentation of sugar using yeast to produce alcohol; immobilized IS258 can be used for this process. This study aims to determine the stability of the polyvinyl alcohol-reinforced alginate-IS258 matrix (Alg-PVA-IS258), assess its service life, and determine the amount of bioethanol produced using Alg-PVA-IS258. This study is a descriptive experimental study with four PVA concentrations (0.5%, 1%, 1.5%, and 2% (w/v)), each with three replicates per treatment, using a fed-batch system over eight fermentation cycles. The parameters observed included total ethanol, fermentation efficiency, physical stability of the beads, pH, residual sugar, and total microbial count. The results of the study showed that the alginate matrix without PVA produced the highest ethanol yield of 34.8 mL, with an efficiency of 83.8%, and remained stable through the eighth cycle. Meanwhile, the addition of 0.5%, 1%, 1.5%, and 2% PVA, respectively, yielded a maximum ethanol yield of 34.0 mL with an efficiency of 81.8%, lasting until the seventh cycle; a maximum ethanol yield of 33.5 mL with an efficiency of 62.6%, lasting until the sixth cycle; a maximum ethanol yield of 33.0 mL, an efficiency of 61.7%, lasting until the sixth cycle; and a maximum ethanol yield of 32.0 mL, an efficiency of 56.7%, lasting until the fifth cycle. With the addition of PVA, the durability of the alginate-IS258 matrix did not improve over the fermentation cycles. These results indicate that the alginate matrix without PVA addition exhibits the best durability because it can be used for a longer period during the fermentation cycles.
Co-Authors Adhe Sri Nanda Puspita Ahmad Ardiansyah Ainun Rofiq Amna Hartiati Bambang Admadi Harsojuwono Elisabet Agustina Sihite Facetarian Indah Dakhi Hidayat Taufik I Made Mahaputra Wijaya Ida Bagus Wayan Gunam Luh Putu Wrasiati Ni Kadek Cahya Sugiani Ni Made Wartini Shafira Salsabila Putri Wildan Khalid