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All Journal Jurnal Sains dan Teknologi Journal of Biobased Chemicals (JOBC)
Yukti Nurani
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Veterinary

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Ekstraksi Senyawa Bioaktif Kulit Kopi dengan Pelarut Aseton Menggunakan Metode Microwave Assisted Extraction dan Analisis Senyawa Fenoliknya Julieta, Theressa; Helda Wika Amini; Ansori Ansori; Yukti Nurani; Ratri Sekaringgalih; Sonya Hakim Raharjo; Merymistika Yufrani Afred
Journal of Biobased Chemicals Vol. 4 No. 2 (2024): Journal of Biobased Chemicals
Publisher : Program Studi Teknik Kimia Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v4i2.1357

Abstract

Dewasa ini, pemanfaatan kulit buah kopi hanya terbatas sebagai pakan ternak dan pupuk. Maka dari itu, dilakukan penelitian dengan memanfaatkan limbah kulit kopi robusta sebagai bahan baku penelitian. Tujuan dilakukannya penelitian ini antara lain untuk mengetahui pengaruh dari beberapa variabel dan mengetahui kondisi optimum dalam proses ekstraksi senyawa bioaktif limbah kulit kopi. Limbah kulit kopi akan diekstrak menggunakan metode Microwave-Assisted Extraction (MAE) dengan pelarut aseton, dengan beberapa variabel yaitu rasio bahan terhadap pelarut, daya microwave, dan waktu ekstraksi. Analisis identifikasi adanya kandungan senyawa fenolik kemudian juga dilakukan menggunakan spektrofotometri UV-Vis. Variabel rasio bahan, waktu ekstraksi, dan daya microwave terbukti saling berkaitan, sehingga dapat menghasilkan total fenol pada kondisi optimum. Kondisi optimum dalam proses ekstraksi senyawa bioaktif limbah kulit kopi diperoleh pada variabel rasio bahan 0,04 g/ml ; waktu 9 menit ; dan daya 300 watt, dengan hasil total fenol sebesar 8,65 GAE/g sampel.
Optimization of Xylitol Production from Tobacco Stem Using Ultrasound-Assisted Acid Hydrolysis Coupled with Fermentation Yukti Nurani; Bekti Palupi; Diana Madhuri; Diah Tri Wulandari; Ansori Ansori
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 4 (2025): Agustus 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i4.6084

Abstract

Tobacco (Nicotiana tabacum L.), as one of the main commodities in East Java Province, where only the leaves are utilized, while the stems become agricultural waste and are often burned, contributes to air pollution. Nonetheless, these tobacco stems possess potential for high-value chemical products, such as xylitol. This study investigated the optimum operating conditions for producing xylitol from tobacco stem waste. The process employed Ultrasound-Assisted Acid Hydrolysis followed by fermentation using Candida tropicalis. Hydrolysis was conducted in an ultrasonic bath that operates at 40 kHz and 50 watts, using 0.1 N H₂SO₄ as the solvent. The resulting hydrolysate was then fermented by adding Candida tropicalis (20 mL per 100 mL substrate) and incubating for 48 hours, 30 °C, 120 rpm shaker. Optimization was conducted utilizing Response Surface Methodology method to assess the interactions between operating variables (temperature, time, and volume of solvent during hydrolysis) and xylitol yield. The study investigated the optimum operating conditions to produce xylitol were 30 °C, 50 minutes, and 150 mL of solvent, yielding xylitol at a concentration of 5.6 g/L.
Co-Authors ansori ansori Ansori Ansori Bekti Palupi Diah Tri Wulandari Diana Madhuri Helda Wika Amini Julieta, Theressa Merymistika Yufrani Afred Ratri Sekaringgalih Sonya Hakim Raharjo