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All Journal Jurnal Sylva Lestari Molekul: Jurnal Ilmiah Kimia
Wahyuningrum, Maeda
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Energy Environmental Science Materials Science & Nanotechnology

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Effectiveness of Different Extraction Techniques on the Yield and Antityrosinase Activity of Merbau (Intsia bijuga (Colebr.) Kuntze) Wood Extract Sari, Ratih Afrida Lismana; Sari, Rita Kartika; Safitri, Utami Dyah; Aristri, Manggar Arum; Wahyuningrum, Maeda; Lubis, Muhammad Adly Rahandi
Jurnal Sylva Lestari Vol. 13 No. 3 (2025): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v13i3.1140

Abstract

This study employed various extraction techniques to determine the yield, phytochemical profile, and antityrosinase activity of merbau wood (Intsia bijuga (Colebr.) Kuntze) extracts. The extraction techniques consisted of two factors: the type of extraction methods (conventional maceration – CM, ultrasound-assisted extraction – UAE, and magnetic stirrer – MS) and the number of extraction repetitions (first repetition – F1, second repetition – F2, and third repetition – F3). The interaction of the extraction methods and the number of extractions affects the extraction yield, antityrosinase activity, and its phytochemical profile. Merbau wood extracted using the UAE-F1 extraction method resulted in the highest yield (13.38%). In contrast, the UAE-F3 extract showed the strongest antityrosinase activity (IC50 value of 1.548 ppm) and the highest total phenol content (692.86 mg/g AGE). Fourier transform infrared analysis of the F1 extract showed that all samples contained the same functional groups, namely C=C (1600–1475 cm-1) and O-H (3800–3000 cm-1), indicating structural similarity among the extracts. Merbau wood extraction using the UAE method, both in the first, second, and third extractions, produced the highest yield, antityrosinase activity, and total phenol content of the extract compared to the CM and MS extraction methods. Keywords: antityrosinase activity, Intsia bijuga, maceration, total phenolic content, ultrasound-assisted extraction
Evaluation of Pyrolysis Temperature and Time on The Quality Improvement of Calliandra Wood Charcoal Briquettes as An Alternative Energy Source Murda, Rio Ardiansyah; Pasaribu, Try Vista Ulina Br; Wahyuningrum, Maeda; Zen, Muhammad Rizky; Maulana, Sena; Rinaldi, Nino; Maulana, Muhammad Iqbal; Munawaroh, Khoryfatul; Lizardi, Fathi; Faedloni, Akbar Ash Shiddiqi
Molekul Vol 21 No 1 (2026)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2026.21.1.14411

Abstract

ABSTRACT. Calliandra (Calliandra calothyrsus) wood is a promising biomass feedstock due to its abundance and high calorific value. This study investigated the effects of pyrolysis temperature (400 °C and 500 °C) and residence time (30 and 60 minutes) on the quality of calliandra charcoal briquettes. Biomass was carbonised, mixed with 15% cassava starch binder, pressed, and oven dried. The briquettes were evaluated for yield, density, moisture, ash, volatile matter, fixed carbon, calorific value, combustion rate, and structural changes. Results showed that all parameters except yield were significantly influenced by temperature and time. FTIR analysis revealed increased aromatisation at higher pyrolysis conditions, while XRD indicated reduced cellulose crystallinity and the emergence of calcite and silica phases. The briquettes exhibited densities of 0.62–0.63 g/cm³, moisture contents of 2.14–2.73%, ash 3.55–4.91%, volatile matter 16.32–25.11%, fixed carbon 68.60–76.63%, calorific values 7,856–7,978 cal/g, and combustion rates 0.08–0.09 g/min. The condition of 400 °C for 30 minutes offered the most balanced performance, while 500 °C for 60 minutes yielded the highest carbonisation and energy content. These findings highlight that moderate pyrolysis conditions can produce efficient, high-quality briquettes with low energy input. Keywords: Biomass, calliandra wood, energy, pyrolysis, wood charcoal briquettes
Co-Authors Dyah Safitri Faedloni, Akbar Ash Shiddiqi Khoryfatul Munawaroh Lizardi, Fathi Lubis, Muhammad Adly Rahandi Manggar Arum Aristri Maulana, Muhammad Iqbal Maulana, Sena Nino Rinaldi Pasaribu, Try Vista Ulina Br Rita Kartika Sari Sari, Ratih Afrida Lismana Zen, Muhammad Rizky