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All Journal Jurnal Sylva Lestari Journal Of Medicine And Health Sciences (Medisci)
Dungani, Rudi
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Energy Environmental Science Health Professions Materials Science & Nanotechnology Medicine & Pharmacology Nursing Public Health

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Characteristics of Cold-Setting Adhesive Derived from Waste Styrofoam for Bonding Laminated Gmelina (Gmelina arborea) Wood Karliati, Tati; Dungani, Rudi; Hadiyane, Anne; Hidayat, Wahyu; Lubis, Muhammad Adly Rahandi
Jurnal Sylva Lestari Vol. 13 No. 2 (2025): May
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v13i2.1080

Abstract

Developing cold-setting adhesives derived from waste styrofoam (WS) of expanded polystyrene foam for laminated gmelina wood involves innovative recycling of WS into functional adhesives. As a type of thermoplastic polymer, WS can be used as an adhesive at room temperature. In this study, WS was functionalized into cold-setting adhesives through dissolution and cross-linking reaction with methylene diphenyl diisocyanate (MDI) at a concentration of 40% w/v at 60°C. The mixture was then stirred at 200 rpm for 30 minutes. The adhesive is characterized by its ability to be set at room temperature, offering environmental benefits and practical applications in wood lamination. Solids content, gelation time, viscosity, cohesion strength, functional group analysis, morphological features, and curing temperature analysis were performed to characterize the cold-setting adhesives. The WS-MDI-40% had 62.4% solids content, 906.8 mPa.s viscosity, 182.3 Pa cohesion strength, and 197.8 minutes of gelation time at room temperature. The adhesion performance was evaluated in laminated wood using gmelina wood at glue spread rates of 250 and 300 g/m2 and cold-pressed at various durations. The block shear strength value of laminated wood bonded with WS-MDI-40% at 300 g/m2 and cold-pressed for 24 hours was higher than that of other samples, reaching 8.2 MPa, which met the Japanese Agricultural Standard (JAS No. 234) for glued laminated timber, exceeding the minimum requirement of 5.4 MPa. Fourier transform infrared (FTIR) spectroscopy revealed that the cold-setting WS-MDI-40% were cross-linked via urethane linkages (R–NH–COO–R). The free –N=C=O groups could react with the –OH groups of gmelina wood to produce laminated wood during cold-pressing. This study suggested a recycling alternative of WS into a cold-setting wood adhesive for laminated wood, which can be utilized in interior applications. Keywords: adhesive, block shear strength, cohesion strength, cold-setting, gmelina wood
Chemical Compound Of Ethanol Extract From Seluang Malik (Leea Amabilis Veitch Ex Mast) Potential As An Anti-Diabetes Rosamah, Enih; Kusuma, Irawan Wijaya; Arung, Enos Tangke; Wicaksono, Dian Anggoro; Dungani, Rudi
Jurnal Medisci Vol 3 No 1 (2025): Vol 3 No 1 August 2025
Publisher : Ann Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62885/medisci.v3i1.941

Abstract

Background. The Bahau ethnic group in East Kalimantan has employed the roots and leaves of the L. amabilis plant as an anti-diabetic remedy. Thus, scientific verification of this herb is required. Aims. The goal of this study is to examine the bioactive compounds, the anti-diabetic potential, and the chemical composition of L. amabilis ethanolic extracts. Methods. Phytochemical analyses, -amylase enzyme activity assays, DPPH free radical scavenging activity tests, and GC/MS chemical compound analyses were used as experimental methodologies. Result. The findings demonstrated the presence of flavonoids, tannins, steroids, carbohydrates, and carotenoids in the leaf extracts. Alkaloid, tannin, triterpene, and carbohydrates were present in the root extracts. Alkaloid, tannin, triterpene, and carbohydrates were present in the root extracts. The antioxidant and anti-diabetic activity of the L. amabilis leaves extract is higher than that of the root. A significant chemical in the leaves and roots of L. amabilis has been identified as endo-Borneol. Conclusion. A substantial chemical in the leaves and roots of L. amabilis has been identified as endo-Borneol. Endo-Borneol from leaves of L. amabilis showed a chromatographic peak at R. Time of 7.327, area of 2483598, area% of 43.64%, height of 956167, and A/H of 2.60. Nevertheless, the Endo-Borneol chromatographic peak from the root of L. amabilis was found at R. Time of 7.605, area of 889232, area% of 100%, height of 49189, and A/H of 18.08. Implementation. The findings of the study highlight the need for further processing of natural antioxidant and anti-diabetic compounds made from L. amabilis leaves.
Co-Authors Enos Tangke Arung, Enos Tangke Hadiyane, Anne Irawan Wijaya Kusuma, Irawan Wijaya Karliati, Tati Lubis, Muhammad Adly Rahandi Rosamah, Enih Wahyu Hidayat Wicaksono, Dian Anggoro