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Journal : Bulletin of Chemical Reaction Engineering

Enhancing Monomeric Sugar Production from Coconut Husk by FeCl3-assisted Hydrothermal Pretreatment and Enzymatic Hydrolysis Wijaya, Candra; Sangadji, Ningsi Lick; Muharja, Maktum; Widjaja, Tri; Riadi, Lieke; Widjaja, Arief
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 3 Year 2025 (October 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20444

Abstract

Coconut husk (CCH), an abundant agricultural byproduct of the coconut processing industry, holds significant potential as a renewable feedstock for monomeric sugar production. However, efficient fractionation remains a challenge due to its recalcitrant lignocellulosic structure. This study investigates FeCl₃-assisted hydrothermal pretreatment (HTP) as a selective and scalable approach to enhance enzymatic hydrolysis efficiency and sugar recovery. The effects of FeCl₃ concentrations, temperatures, and unified of pretreatment conditions as combined hydrolysis factor (CHF) on biomass fractionation, modeling xylan dissolution, and monomeric sugar production were evaluated. Results indicate that 0.06 M FeCl₃ at 150 °C achieved the highest total monomeric sugar concentration of 7.364 g/L, an 11-fold increase compared to the non-catalyzed control (0.667 g/L) during HTP. This condition also facilitated 81.2% hemicellulose removal while minimizing cellulose and lignin degradation, thereby improving enzymatic digestibility. Furthermore, xylan hydrolysis also successfully developed with high correlation with unified CHF parameter. FeCl₃-assisted HTP CCH coupled with enzymatic hydrolysis further enhanced overall sugar recovery, with a total monomeric sugar yield of 18.4 g per 100 g raw CCH, representing a 4.4-fold increase compared to hydrothermally pretreated CCH without FeCl₃. These findings highlight FeCl₃-assisted HTP as a promising, cost-effective strategy for biomass fractionation, supporting its integration into lignocellulosic biorefineries for bio-based product development. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Enhancing Enzymatic Digestibility and Lignin Production of Oil Palm Empty Fruit Bunch (OPEFB) by Green Deep Eutectic Solvent Wijaya, Candra; Pertiwi, Urania Noor Lintang; Apol, Tabina Raissa; Rohmah, Ika Putri Nikmatur; Muharja, Maktum; Widjaja, Tri; Riadi, Lieke; Widjaja, Arief
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 2 Year 2026 (August 2026) (Issue in Progress)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20526

Abstract

Oil palm empty fruit bunch (OPEFB) is an abundant lignocellulosic residue whose high lignin content restricts its bioconversion into sugars and value-added products. Deep eutectic solvents (DESs), particularly choline chloride–lactic acid, offer a green and tunable platform for selective delignification and biomass fractionation. This study investigates the effects of ChCl:LA (1:2) DES pretreatment under varying temperatures (100–140 °C) and reaction times (3-6 h) on the chemical composition, structural modification, delignification kinetics, and enzymatic digestibility of OPEFB. A modified combined delignification factor (CDF) was developed to unify temperature, time, and DES acidity into a single severity descriptor. Delignification followed a biphasic pattern successfully captured by the CDF-based kinetic model (R² = 0.9961), with activation energy of 63.5 kJ.mol⁻¹. Increasing pretreatment severity enhanced hemicellulose and lignin removal (up to 95.5% and 84.4%), while cellulose remained largely preserved. SEM, XRD, and FTIR analyses confirmed progressive disruption of the lignin–carbohydrate matrix, increased cellulose exposure, and removal of amorphous domains. As a result, enzymatic hydrolysis yield improved by more than twofold relative to untreated biomass, reaching 75.5% at 140 °C for 6 h. Mass-balance evaluation demonstrated that from 100 g OPEFB, DES pretreatment yielded 21.6 g glucose and 24.7 g recoverable lignin under optimal conditions. Compared to other pretreatment strategies, the ChCl:LA DES system achieved a balanced co-production of sugars and lignin in significantly shorter processing time. Overall, this work provides mechanistic, kinetic, and mass-balance insights into DES-assisted fractionation of OPEFB and highlights its potential in integrated multiproduct biorefineries. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors A Halim Abd. Mukti, Abd. Abdi, Wuri Tamtama Abdul Rosyid Abdurahman Abdurrahman Abdussalam Al Akbar Achyar Zein, Achyar Adinda, Febby ADITYA NUGRAHA AGUNG DWI SAPTO Ahmad Fuadi Ahmad mukhlasin Ahmad Rifai Aji Abdillah Kharisma Akbar Sanjani, Maulana Akbar, Nabila Hadiah Al Qadri, Muamar Al-azizah, Putri Alfi Ramadani, Nur Algifari, Ridho Aliyudin, Muhamad Yudi Ameer, Khairul Amiruddin Siahaan Ananda, Rusydi Anas, Nirwana Andriani, Rini Dewi Anis Anwar Dalimunthe, Rasyid Apol, Tabina Raissa Arif Rahman arizal, jepri Arizky, Zefri Aswaruddin, Aswaruddin Ayu Yarmayani Azad, Inamul Azhar Azhar Azhari, Muhammad Taufiq Badrudin Bangun, Muhammad Zacky Baskoro, Agung Basu Swastha Dharmmesta Berutu, Riswan Bonifasius Br.Ginting, Novia Rizki Ramadhani Caesariadi, Tri Wibowo Dalimunthe, Muhammad Darmawan, Fery Daulai, Afrahul Fadhila Deddy Supriadi Defitriani, Eni Didik Santoso Dody Oktantiyo S Edi Sahputra Edi Saputra Eka Prasetiya, Andika Fadhli Dzil Ikrom Fatkhur Rohman Febrianti, Indri Firmansyah Firmansyah Fitri Yulia Fransisca Andanti, Maria Gajah, Ewin Sanjaya Habibi Haidir, Haidir Hanum Nst, Rosida Hanum OK, Azizah Harahap, Sri Rezeki Hari Aspriyono HARIYANTO HARIYANTO Hasan Asari Hasibuan, Nurul Fatimah Hawana, Kaswardi Hazaa, Zuhair Mubarrak Herianto Herianto Hidayat, Sandra Taufik Hilwana, Rasidah Himawan, Zulham Hsb, Asmaria Hutabarat, Samrul Bahri Ilwan, Ilwan Iman, Mujhirul Inom Nasution Irene, Rilis Jovito, Felik Rolantius Junani, Bening Luhur Kalsum, Emilya Khairuddin - Khairul Anwar Khairunissa, Bunga Kholivia Kristyowati, Yuli Lahmuddin Lubis Lasahido, Nurrahmi Lensa, Rejeki Lestiana, Herani Tri Lieke Riadi Lubis, Heryus Lubis, Muhammad Ali Napiah Lubis, Nur Haflisma Maisarah Maisarah, Maisarah Manalu, Sri Rahmayani Mansyur Hidayat Pasaribu, Mansyur Hidayat Mardianto Mardianto mariyati mariyati Marlina, yuli Masganti Masganti Masganti Sit Maulidayani, Maulidayani Mesiono, Mesiono miranda, nisa Muhammad Fadhli Muhammad Fuad Zaini Muhammad Maulana Muhammad Rifai muhammad rizky, muhammad Muhammad Yunus Muhammad Yusuf Muharja, Maktum Mukti, Abdul Murdiono Murdiono, Murdiono Muslim Mustakim MZ, ISMAIL Nabila, Aisyah Nani Kartinah Nasri, M Khairul Nasution, Afifah Nurul Khoirot Nasution, Atikah Ahraini Nasution, Rahmad Fauzi Nasution, Rosida Hanum Nasution, Toni Nasution, Wahida Raihan Ningrum, Umi Prastya Nirwana Anas Nova Noor Kamala Sari Novita Sari Novita, Wirda Nur Nasution, Wahyudin Nur'ani, Herlina Nurhasanah, Neni Nurika Khalila Daulay Nurmawati Nurmawati Nurochim, Nurochim Nurussakinah Daulay Oktaviana Mekawati, Nurul Pertiwi, Urania Noor Lintang Pinayungan Dasopang, Erwin Pratiwi, Cantika Putri, Ermawati Rahman, Mhd Fazlul Rahmat Hidayat Ramadhansyah, Muhammad Rambe, Mirza Syadat Rezeki, Dinda Puteri rifa'i, Muhammad Rifai Lubis, Rahmat Rifa’i, Muhammad Ritonga, Asnil Aida Rohmah, Andini Rohmah, Ika Putri Nikmatur Rohman, Fatkhur Roslaeni, Roslaeni Sahana, Willi Saiful Akhyar Lubis Samrin Samrin, Samrin Samudra, Bintang Arif Sangadji, Ningsi Lick Sarimov, Renat Sazali, Muhammad Siagian, Amrullah Sihotang, M. Ismail Tumbor Simangunsong, Arimbi Syahkila Siregar, Alfin Siregar, Rahmad Anwi Siti Aisyah Siti Halimah Sitorus, Nuraisyah Sjarief Widjaja Sofia, Indri Sofia, Revianda Sofian, Sopan Solihah Titin Sumanti, Solihah Titin Sudirman Sudirman Suhairi Suhardi Suhardi Sulistiono, Joko Suparliadi, Suparliadi Suriyadi, Suriyadi Syafaruddin Syafaruddin Syahnur, Mirza Syarqawi, Ahmad Syaukani Syaukani Taher, Jihan Fadhilah Tahim, Abdul Tantri, Arya Tarmizi, Muhammad Tien Rafida, Tien Tri Widjaja Tsabitah, Natasya Utami, Nuria Tri Viktor Handrianus Pranatawijaya Wahyudin Nur Nasution, Wahyudin Nur Wardana, Febri Wibowo, Yudha Gusti Windisyah Putra Y Yahfizham, Yahfizham Yogaswara, Dody Yudhoyono, Aryo Yusuf Hadijaya Zainal Arifin Zaini Dahlan Zakiah, Netty Zulyadaini Zulyadaini, Zulyadaini Zurina, Zurina