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All Journal CHEMICA Jurnal Teknik Kimia BIOEDUSAINS: Jurnal Pendidikan Biologi dan Sains
Maizirwan Mel
International Islamic University Malaysia
Chemical Engineering, Chemistry & Bioengineering Education Energy

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A Study on The Ultrasonic Oil Extraction and Insitu Transesterification of Microalgae Biodiesel Budi Wiyarno; Rosli Mohd Yunus; Maizirwan Mel
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (501.779 KB) | DOI: 10.26555/chemica.v1i2.3569

Abstract

The extraction and transesterification of microalgae oil are interesting topics-besides culturing and microalgae strain- in the development process of biodiesel microalgae. This is an experimental laboratory study that was run using ultrasonic homogenizer Omni Ruptor 4000, examining the effect of type of solvent, solvent concentration, alga-solvent ratio, ultrasonic power, ultrasonic time, ultrasonic pulse, and mixing toward yield. Based on Box-Behnken design, a quadratic model is developed to correlate the parameter to the surface area to analyze certain factors and combinations of dominant factors.The result shows that power, time, and pulse as the most dominant factors that influence the yield. In the extraction, the combinations of pulse-time give better results than power-pulse combination. While in the in situ transesterification, the power-time combination gives a better results that power-pulse combination. Even though the optimum point has not been reached yet, in general, the combination of power-time is categorized as the most influential combination to increase the yield.The experimental values versus predicted values use the model equation developed by STATISTICA Software version 6.0. A line of unit slope, the line of a perfect fit with points corresponding to zero error between experimental and predicted values is also shown that the coefficient of correlation (R2) is 0.97977 (for extraction) and 0.98743 (for in situ). The density of Nannochloropsis sp is 0.924 g/ml, saponification number is 114, 269 KOH/1 g oil. The percentage of FFA is 19.67% consisting of monounsaturated and polyunsaturated Octadecenoic acid (C18:1) 43.49%, Dedecanoic acid (C12) 16.30%, Hexadecanoic acid (C16:0) 12.51%, Tetradecanoic acid (C14) 11.43%, Octadecadinoic acid (C18:2) 5.85% dan Octadecanoic acid (C18:0) 5.62%.
Analisis Kompetensi Sains Biologi dan Kesiapan Karir Mahasiswa Ibnu Hajar; Maizirwan Mel; Sepita Ferazona; Yeyendra; Johari Afrizal; Farid Agung Prasetio; Jenny Br Simamora
BIOEDUSAINS:Jurnal Pendidikan Biologi dan Sains Vol. 9 No. 1 (2026): BIOEDUSAINS:Jurnal Pendidikan Biologi dan Sains
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/gp2j6k43

Abstract

This study aims to analyze the level of biological competence and career readiness of students in the Biology Education Study Program at Universitas Islam Riau (UIR) in the Academic Year 2024/2025. The research employed a quantitative descriptive method with data collected through questionnaires, interviews, and documentation. The sample consisted of students from the Biology Education Study Program at UIR. A closed-ended questionnaire was designed to measure indicators of biological competence, including conceptual understanding, laboratory skills, critical thinking ability, and the application of biology in real-life contexts. Meanwhile, career readiness was evaluated based on students’ perceptions of their self-potential, career goals, and readiness to enter professional fields such as teaching, research, and biology-based entrepreneurship (bioedupreneur). In-depth interviews were conducted to follow up on the questionnaire results, while academic documentation was used to obtain supporting data related to students’ academic status and learning outcomes. Data were analyzed using univariate statistical analysis. The results show that students possess good biological competence, particularly in conceptual understanding and basic laboratory skills. In addition, students’ career readiness is categorized as high, as indicated by their interest and preparedness to pursue careers as teachers, research assistants, or bioedupreneurs. In conclusion, the implemented curriculum has been able to equip students with knowledge and skills relevant to the demands of the professional world and support their career readiness.   Keywords: Bioedupreneur, Biological Competence, Career Readiness  
Co-Authors Budi Wiyarno Farid Agung Prasetio Ibnu Hajar Jenny Br Simamora Johari Afrizal Rosli Mohd Yunus Sepita Ferazona Yeyendra