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All Journal Jurnal Riset Kimia Telecommunications, Computers, and Electricals Engineering Journal
Amalia, Nabila Rizki
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Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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Efektifitas Reaksi Transesterifikasi Minyak Kelapa dan Sereh untuk Pembuatan Perisa Alami dengan Biokatalisator Lipase serta Penggunaan Ultrasonik Moentamaria, Dwina; Amalia, Nabila Rizki; Rosita Dwi Chrisnandari; Irfin, Zakijah; Wulan, Dyah Ratna
Jurnal Riset Kimia Vol. 15 No. 1 (2024): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i1.641

Abstract

In general, flavor are synthesis through enzymatic hydrolysis and esterification reactions (up to 20 hours) using commercial ingredients based on free fatty acids and alcohol. Efficient endeavors utilizing enzymatic transesterification to expedite reactions are necessary to acquire flavored products. Substrates may originate from commercial or natural sources abundant in fatty acids and alcohol. Commercial fatty acids and alcohol (geraniol) are readily available in pure forms. Alternatively, fatty acids can be sourced from coconut oil, while geraniol can be derived from lemongrass oil, which is more cost-effective compared to commercial ingredients. Ultrasonics have emerged as a means to expedite enzymatic. The objective of this study is to investigate the impact of ultrasonic power and transesterification reaction time between coconut oil and geraniol on geraniol conversion. Utilizing lipase (415.99 U/g), coconut oil was subjected to transesterification with commercially obtained pure geraniol in a 1:3 weight ratio, conducted in an ultrasonic tank filled with water. Reaction durations spanned 30, 60, 90, 120, and 150 minutes, with ultrasonic powers set at 50, 70, and 90 watts. The study findings elucidated that the highest geraniol conversion rate of 50.59% was achieved with 70 watts of ultrasonic power over a 90-minute period. These optimal conditions were subsequently applied to transesterify coconut oil with geraniol from lemongrass oil, yielding a conversion rate of 90.29%. This finding demonsttrate the posibility of employing coconut oil and lemongrass oil in a one-stage transesterification process to produce natural flavors via enzymatic lipase catalysis expedited by ultrasonic technology, facilitating swift reaction times.
Study of Elelctrical Installation Planning at Lecture Building of Widya Dharma University Pontianak Amalia, Nabila Rizki
Telecommunications, Computers, and Electricals Engineering Journal (TELECTRICAL) Vol 3, No 2: October 2025
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/telectrical.v3i2.98184

Abstract

As the population grows, the need for educational facilities increases. Therefore, Widya Dharma University Pontianak (UWDP) has developed a new 10-story building with a total floor area of 4,016 m ². The operation of the lecture building will inevitably involve the use of electrical energy. The primary function of electrical energy is to meet the needs of learning facilities, services, and the comfort of all building users to ensure smooth academic activities. This study employs a literature review and descriptive analytical method. During the planning process, several calculations were performed, including determining lighting requirements using DIALux Evo software, cross-sectional area of conductors, current rating of circuit breakers, and a cost estimate (RAB). Based on the calculations and analysis conducted, the number of light points required in each classroom is 16 points, with a total power of 336 Watts. The type of conductor used is NYM 2 × 2.5 mm ² with a fuse rating of 4 Amperes. The total cost of the entire electrical installation work in the classrooms is IDR 45.817.000,00. From this study, it is hoped that an electrical installation plan compliant with SNI 6197 2020, PUIL 2020, and PLN standards can be developed, ensuring efficient and effective use of electrical energy in the academic building while providing comfort for building users.
Co-Authors Dyah Ratna Wulan Irfin, Zakijah Rosita Dwi Chrisnandari