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All Journal International Journal of Renewable Energy Development Jurnal Ilmu Lingkungan BERKALA SAINSTEK Eksergi: Chemical Engineering Journal UNEJ e-Proceeding ALCHEMY Jurnal Penelitian Kimia Warta Pengabdian Chemistry Indonesian Journal of Chemical Research CHEESA: Chemical Engineering Research Articles Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Jurnal Kartika Kimia Jurnal Teknologi Abdimas: Jurnal Pengabdian Masyarakat Universitas Merdeka Malang Dedikasi: Jurnal Pengabdian kepada Masyarakat Mechanical Engineering for Society and Industry Jurnal Pijar MIPA Jurnal Sains dan Teknologi Makara Journal of Science Journal of Biobased Chemicals (JOBC) Sewagati Jurnal Teknik Kimia dan Lingkungan InSTEM International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Penelitian Sains dan Teknologi Indonesia Indonesian Journal of Science and Education Dinamika Kerajinan dan Batik: Majalah Ilmiah
Bekti Palupi
Chemical Engineering, Universitas Jember, Jl. Kalimantan Tegalboto No.37, Krajan Timur, Sumbersari, Kec. Sumbersari, Kabupaten Jember, Jawa Timur 68121
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Turmeric Leaves Extraction (Curcuma Longa L.) as a Natural Preservative Using Ultrasound-Assisted Extraction (UAE) Method Isni Salma Salsabillah; Rossi Agnessi Pebriana; Bekti Palupi; Ditta Kharisma Yolanda Putri; Istiqomah Rahmawati
JOBC Vol. 4 No. 1 (2024): Journal of Biobased Chemicals
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Turmeric leaves (Curcuma longa L.) contain phytochemical compounds that can be utilized as natural food preservatives or bioformalin due to their antibacterial properties. The extraction method used in this study is Ultrasound-Assisted Extraction (UAE), to determine the effect of variable sample-solvent ratio, time, and particle size on total flavonoid, tannin, and alkaloid compounds, as well as to determine the optimal shelf life of fresh tuna. This study used sample-solvent ratio variables of 1:10, 1:15, and 1:20; time variables of 10, 20, and 30 minutes; and particle size variables of 60, 80, and 100 mesh. The highest total flavonoid compound was obtained in the variable sample-solvent ratio of 1:20, the particle size of 100 mesh, and the time of 20 minutes at 98.076 mg/L. The highest total tannin compound was obtained in the variable sample-solvent ratio of 1:15, the particle size of 60 mesh, and the time of 10 minutes at 41.697 mg/L. The highest total alkaloid compound was obtained in the variable sample-solvent ratio of 1:10, the particle size of 100 mesh, and the time of 20 minutes at 10.092 mg/L. The optimum curing time for tuna is 36 hours at room temperature with variable sample-solvent ratio, time, and particle size of 1:20 g/mL, 20 minutes, and 100 mesh with 20% concentration. The running has the highest flavonoid compounds, so it can be concluded that flavonoid compounds have a major effect on the preservation process of tuna.
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.
Process Optimization for Bioplastic Synthesis from Ulva Lactuca with the Addition of Citric Acid and Boric Acid as Crosslinkers Yukti Nurani; Hilda Huril Ainia; Alfun Ni’matil Husna; Sonya Hakim Raharjo; Merymistika Yufrani Afred; Ansori Ansori; Ratri Sekaringgalih; Helda Wika Amini; Ditta Kharisma Yolanda Putri; Meta Fitri Rizkiana; Boy Arief Fachri; Zuhriah Mumtazah; Istiqomah Rahmawati; Bekti Palupi; Felix Arie Setiawan
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60021

Abstract

The development of renewable biomass-based bioplastics is one solution to reduce environmental pollution caused by the use of conventional petroleum-based plastics. One potential source of biomass is Ulva lactuca, which contains ulvan polysaccharides that can be used as a material for forming biodegradable bioplastic films. This study aims to determine the optimum conditions for the synthesis of ulvan-based bioplastics using the Response Surface Methodology (RSM). Bioplastics were synthesized using the solution casting method with ulvan filtrate as the main matrix and polyvinyl alcohol (PVA) as the supporting polymer, with glycerol and sorbitol as plasticizers and citric acid and boric acid as cross-linkers. Optimization was performed using a Box–Behnken design with 17 experiments, with independent variables of boric acid mass (0.025 - 0.075 g), mixing temperature (65 - 75 ˚C), and mixing time (15 - 25 minutes). The optimization results showed that optimal conditions at a mixing temperature of 70 °C, boric acid mass of 0.05 g, and mixing time of 20 minutes, with point prediction of 4.1476 MPa in tensile strength, thickness of 0.088 mm, and desirability value of 1. The statistical model for tensile strength demonstrated an R2 value of 0.9468, an adjusted-R2 of 0.8785, and a lack-of-fit value of 0.3024. Meanwhile, the thickness model exhibited an R2 value of 0.9792, an adjusted-R2 of 0.9524, and a lack-of-fit value of 0.7510.
Co-Authors Abdul Malik Karim Amrullah Achmad Rodi Soleh Adelina, Saltsabita Nourin Adrian, Febri Adriansyah, Muhamad Afred, Merymistika Yufrani Afwal, Diza Raudhatul Agus Rahman Agus Wedi Pratama Ahmad Reza Maulufi Aina Christalia Rinastiti Akbar, Muhammad Faqihuddin Akhsan, Maulana Yudha Al Fajri, Maktum Muharja Alfun Ni’matil Husna Alifia Rahma Putri Neysella Amalia Ramadhan Amartya, Audi Nur Andikasari, Emi Anggraini, Ranita Anggi Annisa, Yasmin Ansori ansori ansori Ansori Ansori Ardianti , Nanda Melani Ari Susanti Ari Susanti Ari Susanti Ariel Seanhan Haezer Asshofy , Muhammad Agil Atiqa Rahmawati Atiqa Rahmawati Atiqa Rahmawati Audi Nur Amartya AYU WULANDARI Aziz, Mohamad Naufal Nizaar Azizi, Daffa Hafiziaulhaq Badril Azhar Badril Azhar Bestari, Cherobina Bida Ayu Bimo Bayu Aji Boy Arief Fachri Boy Fachri Dani Hari Tunggal Prasetiyo Darojat, Zakiah Devara, Arighy Zahirah Faiqy Devi Prayuga Diah Tri Wulandari Diana Madhuri Dianavita Fatimah Dianita Ivana Permata Dihayat, Icha Shofia Dini Rahmawaty Ditta Kharisma Yolanda Ditta Kharisma Yolanda Putri DWI LESTARI, FITRIA Elisah, Nor Endar Hidayat Fachri, Boy Fakhri Arkaan Humaidi Fandora, Ardan Jauza Farwah, Zilma Aliyah Fatimah, Dianavita Felix Arie Setiawan Firdausi, Adnan Maulana Firmansyah, Alex Firmansyah, Arfian Alwi Firmansyah, Muhammad Sahrul Firsta Retnaningtyas Udroto Gregah Pangayoman Hartanto P Gregah Pangayoman Hartono Putro Habibatul Inayah Harti Arini Hanafi, Yogie Alfian Helda Wika Amini Helda Wika Amini Helda Wika Amini Heni Pujiastuti Herdianto, Dimas Nur Hidayat, Debby Aurellia Hilda Huril Ainia Hosshofil Azhar Azizi Humaidi, Fakhri Arkaan Icha Shofia Dihasti Ifan Ramadana Indrayani, Lilin Intan Permatasari Isni Salma Salsabillah Istiqomah Rahmawati Istiqomah Rahmawati Istiqomah Rahmawati Istiqomah Rahmawati Istiqomah Rahmawati Kartini, Audiananti Meganandi Kenji Sakai Kenji Sanomoto Khoirunnissa , Aulia Kurniawan, Muhammad Rizky Lailatul Krisna Abdullah Lalu Dimas Putra Hermanto Lestari, Afrila Tutut Dwijati Lilis Nurhasanah Lukman Nulhakim Lumbantoruan, Sri Lestari Maharani, Regita Gustiayu Pramisti Mahfud Mahfud Mahfud Mahfud Maktum Muharja Maktum Muharja Maulida Septiyana Megasari, Tri Elok Setya Meta Fitri Rizkiana Meta Fitri Rizkiana Meta Fitri Rizkiana Mizanurafi’ Ghifarhadi Prasiefa Mochamad Ghaza Al Ghifari Mohammad Nor Muhammad Ilham Muhammad Reza Muhammad Reza Muhammad Rizky Kurniawan Muharja, Maktum Nabilla Widya Rahman Nadia Ayumna Fa’iqoh Naily Fatimatuz Zaroh Nanda Ayudiyah Andriani Nanda Ayudiyah Andriani Nasrul Ilminnafik Naufal Nizaar Aziz, Mohamad Nida Ayu Salsabila Nikita Meidi Nova Chintya Kurniawati Nova Chintya Kurniawati Nugraha, Briantara Agung Nugroho, Yeremia Prasetya Nur Karima Nur Karima Nurjannah, Lailia Nurtsulutsiyah Nurtsulutsiyah Nurtsulutsiyah, Nurtsulutsiyah Nurul Hidayati Pradipta, Shima Nuril Pramasta, Ady Pramudiska, Riavinola Viyoni Pratiwi, Widya Septaningtyas Pravitasiwi, Nanda Tricya Julia Prayuga, Devi Purimahua, Amanda Augre Maharani Putri, Salsabila Ananda Rachman, Darryl Akeyla Rafif, M. Attar Raharjo, Nadhya Cahya Dwy Rahman, Agus Ramadana, Ifan Ratnasonia, Samantha Githa Ratri Sekaringgalih Regita Gustiayu Pramisti Maharani Rekfa Wika Amini Relyando, Syahfa Adinda Reswara Musyafa Riavinola Viyoni Pramudiska Richa Febyola Surya Putri Rizalluddin, Muhammad Rizki Fitria Darmayanti Rizki Fitria Darmayanti Rizki Maulana Hakiki Rizkiana, Meta Rossi Agnessi Pebriana Sakai, Kenji Salma, Isni Salma Salsabillah Salsabila , Nida Ayu Samantha Githa Ratna Sonia Sanomoto, Kenji Saputri, Ocha Sa’roni, Achmad Sella Violina Anggraeni Septianti, Kiki Setiawan, Arinda Sabrina Shabrina, Nadhilah Shofiah , Laila Nur Sholeha, Irdatus Sonya Hakim Raharjo Subekhi, Jovenlee Gibran Susanti, Eka Puji Susilowati Susilowati Suyitno Syahfa Adinda Relyando Syaifullah, Rangga Yudha Syeikh Maulana Bima Suci Tarigan, Eigiya Nina Tashiro, Yukihiro Tri Elok Setya Megasari Udroto, Firsta Retnaningtyas Ulfiani, Khoirun Nisya' Uzinuzulla, Yunita Virda Wardani, Salza Belila Kusuma Wardhani, Maharani Tri Welayaturromadhona Wibowo, Jihan Nafila Widarti, Rr Diva Naila Putri Wiwik Pratiwi Yahya, Ahmad Daily Yeremia Prasetya Nugroho Yohanes Yohanes Yohanes Yolanda, Ditta Kharisma Yukihiro Tashiro Yukti Nurani Zuhriah Mumtazah