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All Journal Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Riau Journal of Empowerment Teknomekanik Unri Conference Series: Community Engagement Journal of Applied Materials and Technology Journal of Bioprocess Chemical and Environmental Engineering Science Molekul: Jurnal Ilmiah Kimia Jurnal Sains Materi Indonesia
Syelvia Putri Utami
Department Of Chemical Engineering, Engineering Faculty, Universitas Riau
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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From waste to value: Lapachol from teak wood waste as a green catalyst for sustainable soda cooking of Acacia and Eucalyptus Sari, Esty Octiana; Utami, Syelvia Putri; -, Evelyn; Nakagawa-Izumi, Akiko; Ohi, Hiroshi
Journal of Applied Materials and Technology Vol. 7 No. 1 (2025): September 2025
Publisher : Faculty of Engineering Universitas Riau and Applied Materials and Technology Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.7.1.22-30

Abstract

The development of a sustainable catalyst as an alternative to synthetic anthraquinone (AQ) is urgently needed for a more efficient pulping process. This study investigates the potency of lapachol, a natural naphthoquinone isolated from teak (Tectona grandis) wood waste, as a catalyst in soda cooking of three industrially important hardwoods: Acacia crassicarpa, Eucalyptus pellita, and Eucalyptus globulus. Approximately 97.7% purity of lapachol was isolated and applied at 0.09% (on oven-dry wood). For comparison, the commercial synthetic additive, 2-Methylanthraquinone (2-MAQ) was also used at the same dosage.  Cooking experiments were conducted at 160°C under varying alkali dosages (23, 27, 31%) and times (4, 5, 6 h). The result revealed that the delignification performance was species-dependent: A. crassicarpa (S/V=0.74) was the hardest, while E. globulus (S/V=3.04) was the easiest to delignify. Notably, E. pellita (S/V=2.04) shows the greatest selectivity index. Lapachol shows the capability of enhancing delignification across the three wood species by decreasing the residual lignin by up to 5% in A. crassicarpa, 5% in E. Pellita, and 2% in E. globulus compared with soda cooking (control). Although the delignification is slightly lower than 2-MAQ, lapachol maintains pulp yields comparable to or higher than 2-MAQ. The selectivity index analysis confirmed that lapachol improved the balance between lignin removal and carbohydrate preservation, with the benefits most pronounced in E. globulus. These findings underscore lapachol as a promising sustainable pulping catalyst, offering the potential for impactful industry transformation through sustainable innovation.
Hydrolysate as an alternative feedstock for furfural production Utami, Syelvia Putri; Rezki, Yoanni Marsha; Ermalinda, Vina; Komalasari; Aziz, Yelmida
Jurnal Sains Materi Indonesia Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

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

Abstract

Furfural has emerged as a value-added chemical product which generated from hemicellulose-base biomass, in the context of hardwood it called as biorefining. Several methods have been developed to produce furfural using both hydrothermal and catalytic processes. In this study, hydrolysate is used as feedstock for generating furfural by using diluted sulfuric acid and aluminium chloride. Temperature and reaction time has been considered as the valuable variable. Hydrolysate was charged with the acid-catalyst for around 90 min at certain temperature. The product analyzed by using fourier transform index refractory and excess bromine method. At this time, the highest yield of furfural for non-catalyst process was achieved at 120 oC for 90 min. Diluted acid solution by hydrochloric acid and AlCl3 1% managed to increase furfural production from hydrolysate in the mild temperature.
Characteristics of Purified Lignin Obtained from Metroxylon Sagu Palm Fronds, Oil Palm Fronds, Cratoxylum arborescens, and Eucalyptus pellita via Soda-Methylanthraquinone Pulping Evelyn, Evelyn; Utami, Syelvia Putri; Yusnimar, Yusnimar; Fermi, Iwan; Chairul, Chairul; Ohi, Hiroshi
Molekul Vol 20 No 3 (2025)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2025.20.3.11016

Abstract

ABSTRACT. Lignin is a valuable material that can be obtained from the black liquor generated during dissolving pulp production from lignocellulosic materials. Lignin can be used to produce biopolymers, fuels, value-added chemicals, and other functional materials. This study investigates the isolation and characterization of lignin from four lignocellulosic biomass sources i.e. Metroxylon sagu palm fronds (SPF), oil palm fronds (OPF), Cratoxylum arborescens, and Eucalyptus pellita using environmentally friendly soda–methylanthraquinone (soda–MAQ, 160 ºC for 1.5 h) pulping followed by acid precipitation with hydrochloric acid (pH 2.0-2.5). The lignin yield varied among the materials (68.3-88.8%), with E. pellita showing the highest recovery. SEM analysis revealed distinct differences in lignin morphology, where E. pellita lignin exhibited a more condensed and homogeneous structure compared to the more fragmented forms from non-wood biomass. FT-IR spectra confirmed the presence of guaiacyl, syringyl, and hydroxyl phenol units in all samples. EDX analysis supported the natural lignin composition, especially in E. pellita, OPF, and C. arborescens. Among the four sources, lignin from E. pellita demonstrated the greatest potential for value-added applications, followed by C. arborescens and OPF. These findings provide valuable insight into lignin recovery from diverse biomass and its suitability for further bioproduct development. Keywords: Biomass, characterization, dissolving pulp, lignin, soda-methylanthraquinone
Pengaruh Glukomanan dalam Perekat Berbasis Polyvinyl Acetate Terhadap Kuat Rekat Kayu Rahmani, Wahyu Suci; Bahruddin, Bahruddin; Utami, Syelvia Putri
Journal of Bioprocess, Chemical and Environmental Engineering Science Vol 7 No 1 (2026): Journal of Bioprocess, Chemical, and Environmental Engineering
Publisher : Department of Chemical Engineering, Faculty of Engineering, UNRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jbchees.7.1.33-43

Abstract

Polyvinyl acetate adhesive is widely used in the wood industry; however, its application still relies heavily on synthetic materials. Therefore, modification of polyvinyl acetate with glucomannan was conducted to enhance bonding strength while reducing the use of synthetic adhesives. This study aimed to analyze the effects of glucomannan concentration in the gel, glucomannan gel content, and polyvinyl alcohol content on the bonding strength of wood adhesives, as well as to determine the optimum formulation conditions. The experimental design was conducted using Box Behnken Design with 17 experimental runs, and optimization was performed using Response Surface Methodology. Glucomannan gel was blended with polyvinyl acetate and polyvinyl alcohol, followed by testing of dry bonding strength, wet bonding strength, and total solid content. The results showed that increasing glucomannan concentration in the gel decreased bonding strength, while increasing glucomannan gel content enhanced bonding strength up to an optimum level and declined at higher concentrations. The addition of polyvinyl alcohol significantly improved the bonding strength of glucomannan–polyvinyl acetate-based adhesives. The optimum conditions were obtained at a glucomannan concentration in the gel of 10% (w/w), glucomannan gel content of 31.38% (w/w), and polyvinyl alcohol content of 3.73% (w/w), resulting in a dry bonding strength of 16.97 MPa, wet bonding strength of 5.44 MPa, and TSC of 39.88%.
Optimasi Derajat Grafting Stiren Akrilik pada Molekul Poli Isoprena Karet Alam untuk Pembuatan Cat Emulsi Briliantina Rossa; Utami, Syelvia Putri; Bahruddin, Bahruddin
Journal of Bioprocess, Chemical and Environmental Engineering Science Vol 7 No 1 (2026): Journal of Bioprocess, Chemical, and Environmental Engineering
Publisher : Department of Chemical Engineering, Faculty of Engineering, UNRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jbchees.7.1.1-12

Abstract

Natural rubber modified through graft copolymerization offers improved compatibility and performance for water-based coating applications. This study investigates the optimization of grafting efficiency of styrene–acrylate onto natural rubber latex using a free-radical mechanism. Three processing variables—dry rubber content, styrene–acrylate concentration, and binder proportion—were evaluated using Central Composite Design within the Response Surface Methodology framework. The grafting process was carried out at 60 degrees Celsius for 210 minutes, followed by gravimetric analysis to determine the degree of grafting. Experimental results showed that dry rubber content exerted the most significant effect on grafting efficiency, while styrene–acrylate and binder levels contributed secondary but supportive influences. The response surface model demonstrated strong predictive capability, with an average prediction error of 2.84 percent. Optimal conditions were achieved at 60 percent dry rubber content, 10 percent styrene–acrylate, and approximately 19.7–20 percent binder, yielding a grafting degree of 63.32–64.11 percent in prediction and 64.23–67.21 percent in experimental validation. These findings confirm the effectiveness of controlled grafting to enhance polymer–monomer interactions and improve the performance of natural-rubber-based binders. The optimized grafted latex shows potential for industrial applications in waterborne coatings requiring strong adhesion, improved wash resistance, and stable film properties.
Co-Authors -, Evelyn Amun Amri Azhari Harahap Aziz, Yelmida Bahruddin Bahruddin Bahruddin Briliantina Rossa Chairul Chairul Chairul Chairul Deasy Rahmayuni Deni Afrika Dewi Maya Sari Dewi Sunarti Dini Wulandari Edy Saputra Ermalinda, Vina Evelyn Evelyn Evelyn Evelyn EVELYN EVELYN Fajrina Qaishum Fauzia Mulyana Febryza, Dhina Fermi, Iwan Fryda Kusumawati Khoirunnisa Futhanul Wewe Gilda Miranda Hamsyah Adhari Heri Rahmana Jhon Armedi Pinem Karim Abdullah Komalasari Komalasari Komalasari Komalasari Komalasari Komalasari Komalasari Miran, Hussein A. Muhammad Furqan, Muhammad Muhammad Rivai Muhammad Shalahuddin Muhammad Sugandi Nakagawa-Izumi, Akiko Nor Aisha Saidina Amin Novia Azzahra Novriyani, Vivi Nurwijayanti Ohi, Hiroshi Pebriansyah Putra Priscilla Vidya Merarin Putri, Diana Eka Rahman, M. Mahbubur Rahmani, Wahyu Suci Rezki, Yoanni Marsha Rifati Hanifa Romaito, Rizki Falah Sari, Esty Octiana Sri Rezeki Muria Voadi, Salsabilla Diva Wahyu Hidayat Windy Odelia Putri Yasminto, Habib Maulana Yusnimar Sahan