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All Journal International Journal of Advances in Applied Sciences Mechanical Engineering for Society and Industry
Wulandana, Rachmadian
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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Identification and antioxidant activity test of β-tocopherol from Dompu corn oil as anti-aging Permadi, Adi; Budiastuti, Pramudita; Setyanto, Barry Nur; Wulandana, Rachmadian; Nuraisyah, Fatma; Novitasari, Putri Rachma; Syamsuddin, Arief; Ramadhan, Muhammad Kaisar Sutomo; Rosandy, Andi Rifki
International Journal of Advances in Applied Sciences Vol 14, No 1: March 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v14.i1.pp175-184

Abstract

Corn is a well-cultivated food crop that is grown extensively worldwide. The used portion of corn is its seeds, which are rich in oil. The objective of this study is to separate and characterize tocopherol from corn oil in Dompu, Sumbawa by employing spectroscopic techniques such as ultraviolet (UV) spectrophotometry, ultra-performance liquid chromatography (UPLC), nuclear magnetic resonance (NMR), and liquid chromatography-mass spectrometry (LC-MS). Subsequently, the in-vitro antioxidant activity of the tocopherol was assessed. 1 kilogram of dry maize kernels subjected to 70% ethanol extraction yielded 30 grams (35 ml) of corn oil. The purified isolate obtained from the fractionated extract, using radial chromatography, demonstrated the presence of tocopherol. The isolated sample exhibited the presence of beta-tocopherol. Beta-tocopherol's anti-aging properties were assessed by conducting an in-vitro antioxidant activity test utilizing the tyrosinase enzyme. The IC50 value obtained was 83.954±2.849 ppm. The IC50 value indicates that beta-tocopherol possesses significant antioxidant activity, making it suitable for usage as a primary ingredient in cosmetics and pharmaceutical products.
Thermal performance optimization of biomass-fired ovens using computational fluid dynamics: A Case study of coconut shell briquette production in Indonesia Busaeri, Nundang; Hiron, Nurul; Meylani, Vita; Hendra; Wulandana, Rachmadian
Mechanical Engineering for Society and Industry Vol. 6 No. 2 (2026): Issue in Progress
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.16483

Abstract

Uniform heat distribution is essential for staged drying of coconut-shell briquettes because temperature overshoot can induce thermal shock and reduce product quality. This study evaluated the thermal performance of an industrial biomass-fired briquette oven using transient computational fluid dynamics (CFD). The oven was equipped with a 20 kW burner that supplied 500 °C gas to a stainless-steel straight-tube heat exchanger and a ceiling-mounted blower that delivered 3 m³/s downward airflow. A transient three-dimensional CFD model incorporating incompressible ideal-gas flow, the SST turbulence model, P1 radiation, and conjugate heat transfer was used to compare wall-mounted and floor-mounted heat-exchanger configurations. The wall-mounted configuration generated stronger forced-convection recirculation and more uniform heating, with a mean temperature of 81.95 °C, ΔT of 10.57 °C, and a coefficient of variation of 3.75%. The floor-mounted configuration achieved a higher heating capacity, with a mean temperature of 108.14 °C and stored thermal energy of 3.02 MJ, but it showed poorer uniformity, with ΔT of 32.23 °C and a coefficient of variation of 8.79%. Heating efficiency increased from 32.5% for the wall-mounted case to 43.1% for the floor-mounted case. The results reveal a clear trade-off between temperature uniformity and heating capacity and provide a comparative numerical basis for evaluating heat-exchanger placement under the investigated operating conditions.
Co-Authors Andi Rifki Rosandy Budiastuti, Pramudita Busaeri, Nundang Fatma Nuraisyah, Fatma Hendra Novitasari, Putri Rachma Nurul Hiron, Nurul Permadi, Adi Ramadhan, Muhammad Kaisar Sutomo Setyanto, Barry Nur Syamsuddin, Arief Vita Meylani