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All Journal VALENSI Jurnal Penelitian Saintek Reaktor JURNAL KIMIA SAINS DAN APLIKASI Chem Info Indonesian Journal of Mathematics and Natural Sciences Program Kreativitas Mahasiswa - Penelitian INDONESIAN JOURNAL OF PHARMACY Indonesian Journal of Chemical Science Indonesian Journal of Chemistry Molekul: Jurnal Ilmiah Kimia Greensphere: Journal of Environmental Chemistry International Journal of Renewable Energy Development
Nor Basid Adiwibawa Prasetya
Department Of Chemistry, Faculty Of Science And Mathematics, Diponegoro University Jl. Prof. H. Soedarto SH Tembalang, Semarang 50275, Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Medicine & Pharmacology

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Synthesis of Carboxylated Chitosan Amide Using Some Cyclic Anhydride and Their Activities as Antifungal Ismiyarto, Ismiyarto; Mumtazati, Qonita; Pandelaki, Elmi Christi Julia; Fachriyah, Enny; Ngadiwiyana, Ngadiwiyana; Sarjono, Purbowatiningrum Ria; Prasetya, Nor Basid Adiwibawa
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 9, No. 2, November 2023
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v9i2.35244

Abstract

Chitosan is a natural polymer that has antifungal activity. It is necessary to modify chitosan into its derivatives to increase its activity. One modification of chitosan that has the potential to be developed as an antifungal is carboxylated chitosan amide because this chitosan derivative contains a carboxylic group and is more hydrophilic. This research aims to synthesize chitosan amide carboxylate using several cyclic anhydride compounds and test its antifungal activity against Aspergillus flavus. The cyclic anhydrides used in this research are maleic anhydride and phthalic anhydride. In the initial stage of chitosan amide carboxylate synthesis, reaction optimization was carried out at varying temperatures of 25, 50, and 72oC for 7 hours. Compound characterization was carried out using FTIR and UV-Vis spectrophotometry. The disc diffusion method tested the chitosan amide carboxylate product for its antifungal activity against Aspergillus flavus. The optimal MCA (Maleoyl Chitosan Amide) product is (MCA_50), synthesized at a reaction temperature of 50oC. Under these optimal reaction conditions, PCA_50 (Pthaloyl Chitosan Amide) was successfully synthesized to produce a brownish-yellow solid with a yield of 46.1% (w/w) and a degree of substitution (DS) of 41.93%. The diameter of the inhibition zone against Aspergillus flavus for PCA_50 was 30 mm at the 12th hour of observation. The product (PCA_50) has better antifungal activity than chitosan and MCA_50.
The Effect of SiO2 Addition to the Hydroxyapatite/Curcumin Composite Properties Windarti, Tri; Prasetya, Nor Basid Adiwibawa; Ngadiwiyana, Ngadiwiyana
Indonesian Journal of Chemistry Vol 24, No 5 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.93802

Abstract

Hydroxyapatite/curcumin composites have been studied as a calcium phosphate cement candidate. In this research, the effects of adding SiO2 to the hydroxyapatite/curcumin composite on the characteristics of the cement, such as the crystal and surface properties, as well as the release behavior of curcumin in Ringer's solution media, were studied. The composite preparation with and without SiO2 was carried out using a Na2HPO4 2.5% solution. The results showed that the addition of 25% SiO2 to the hydroxyapatite/curcumin composite did not change the crystal properties of hydroxyapatite but produced a more homogenous distribution of the ingredients. The behavior of the composite in Ringer's solution also changes, which is proven by the change in the crystal growth direction and Ca/P ratio. Adding SiO2 produced a composite with a platter and larger particles, as well as a higher Ca/P ratio on the surface. The presence of SiO2 inhibited the release of curcumin in which the ratio of HA: curcumin changed from 77.7%:22.3% to 69.6%:30.4% after 5 d of immersion in Ringer's solution. Thus, besides increasing calcium phosphate deposition on the cement surface, SiO2 also prevents curcumin from being released from the composite.
Impact of crosslinking on quaternary ammonium poly(vinyl alcohol)/polyquaternium-7 anion exchange membranes for alkaline polymer electrolyte fuel cells Samsudin, Asep Muhamad; Rokhati, Nur; Prasetya, Nor Basid Adiwibawa; Kumoro, Andri Cahyo; Anggoro, Didi Dwi; Nasher, Kharissa; Wahyudi, Dhiky; Roschger, Michaela; Hacker, Viktor
International Journal of Renewable Energy Development Vol 14, No 4 (2025): July 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.60897

Abstract

Alkaline Polymer Electrolyte Fuel Cells (APEFCs) have emerged as a promising candidate for clean energy production. Anion exchange membrane (AEM) is an essential element of alkaline polymer electrolyte fuel cells for its role in facilitating hydroxide ion conduction. The objective of this study is to investigate the effect of a glutaraldehyde-based crosslinker solution on the performance of anion exchange membranes (AEMs) fabricated using quaternary ammonium poly (vinyl alcohol) (QPVA) as the backbone polymer and polyquaternium-7 as the second polymer. The introduction of a glutaraldehyde-based crosslinking agent was purposed to enhance membrane stability and reduce excessive swelling. The study evaluates the impact of varying glutaraldehyde concentrations on membrane performance. FTIR analysis confirms the presence of key functional groups of QPVA, polyquaternium-7, and the crosslinking agent. SEM images reveal that the membranes demonstrate dense and homogeneous physical structure. The results show that water uptake, swelling degree, ion exchange capacity (IEC), and hydroxide conductivity are influenced by the concentration of the glutaraldehyde solution. The QP-GA-13 AEM exhibited the best overall performance, achieving the highest tensile strength of 31.1 MPa and the highest hydroxide ion conductivity of 4.15 mS cm⁻¹ at 70°C. In single-cell tests, this membrane delivered a maximum power density of 85 mW cm⁻² and a current density of 350 mA cm⁻² at 80°C under humidified oxygen conditions.
Isolation of Endophytic Pseudomonas Strains from Papaya Leaves and Their Extracellular Enzyme Production and Antioxidant Profile Sarjono, Purbowatiningrum Ria; Choirunnisa, Nur Fadilla; Triwijayanti, Yunita; Salsabila, Salsabila; Asy’ari, Mukhammad; Ngadiwiyana, Ngadiwiyana; Ismiyarto, Ismiyarto; Prasetya, Nor Basid Adiwibowo; Andriani, Yosie
Jurnal Kimia Valensi Vol. 11 No. 1 (2025): Jurnal Kimia VALENSI
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v11i1.40921

Abstract

Endophytic bacteria, symbiotic microorganisms residing in plant tissues, produce bioactive compounds similar to host plants, such as antioxidants. These antioxidants are crucial in combating free radicals linked to degenerative diseases. This study isolates and characterizes two endophytic bacterial strains from papaya leaves, exploring their enzymatic and antioxidant activities. Two isolates of endophytic bacteria from papaya leaves were obtained, F1-A and F1-B. F1-A endophytic bacteria are types of monobacilli, Gram-positive bacteria. F1-B endophytic bacteria are types of Bacilli. Using 16S rRNA analysis, both isolates were predicted to belong to the Pseudomonas bacterial strain. Research on optimizing their growth under various temperatures and pH conditions showed that both isolates grow best at 37°C. F1-B provides a better opportunity as a source of industrial enzymes because it can excrete amylase, urease, cellulose, and protease enzymes compared to F1-A, which can only produce amylase and protease enzymes. Nevertheless, F1-A can act as a potent antioxidant with an IC50 of 34.18 ppm compared to F1-B, which has an IC50 value of 292.31 ppm. The IC50 value of the F1-A isolate was not much different from the IC50 of quercetin, which was 12.50 ppm. The ability of F1-A as an antioxidant is also influenced by the results of phytochemical screening, which can contain more secondary metabolites than F1-B. These results highlight the potential of Pseudomonas strains as sources of industrial enzymes and natural antioxidants, warranting further investigation.
Co-Authors Abdul Haris Andri Cahyo Kumoro Anugrah Ricky Wijaya Arif Sony Wibowo Asep Muhamad Samsudin, Asep Muhamad Asy’ari, Mukhammad Ayub Indra Azis Amrullah Choiril Azmiyawati Choirunnisa, Nur Fadilla Damar Nurwahyu Bima Didi Dwi Anggoro Drs. Abdul M.Si Haris Drs. Gunawan M.Si. Eka Pratista Enny Fachriyah Gunawan Gunawan Gunawan Gunawan Hacker, Viktor Hendra Dwipa Rifky Mahardika Heru Susanto Ina Noprastika Ismiyarto Ismitarto Ismiyarto Ismiyarto khabibi Khabibi Khoirun Nita Ulfia Limpat Nulandaya Liswinda Zafirah Rahmatia Mohd Hafiz Dzarfan Othman Muhammad Cholid Djunaidi Mumtazati, Qonita Nanik Wijayanti Nasher, Kharissa Ngadiwiyana M.Si. S.Si. Nies S. Mulyani Nies Suci Mulyani Niken Windi Saputri Nissa Nurfajrin Solihat Nur Asih Setyowati Nur Rokhati Nurwarrohman Andre Sasongko Pandelaki, Elmi Christi Julia Parsaoran Siahaan Pratama Jujur Wibawa Purbowatiningrum Ria Sarjono Retno Ariadi Lusiana Riska Marina Anggraini Roni Adi Wijaya Roschger, Michaela Salsabila, Salsabila Saputry, Agriccia Pangestica Sarahtrinita Glikeria Like Megawati Sri Wuning Tri Windarti Triwijayanti, Yunita Tutuk Djoko Kusworo Wahyudi, Dhiky Yosie Andriani Yulia Milarsih