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All Journal VALENSI Indonesian Journal of Chemistry Indonesian Journal of Jamu Biodiversitas Journal of Biological Diversity
Rahayu, Dyah Utami Cahyaning
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Indonesia, Depok 1642, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Health Professions Medicine & Pharmacology

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Synthesis and Characterization of Copper Impregnated Mesoporous Carbon as Heterogeneous Catalyst for Phenylacetylene Carboxylation with Carbon Dioxide Putri Nurul Amalia; Iman Abdullah; Dyah Utami Cahyaning Rahayu; Yuni Krisyuningsih Krisnandi
Indonesian Journal of Chemistry Vol 21, No 1 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.52778

Abstract

Carbon dioxide (CO2) is a compound that can potentially be used as a carbon source in the synthesis of fine chemicals. However, the utilization of CO2 is still constrained due to its inert and stable nature. Therefore, the presence of a catalyst is needed in CO2 conversion. This study aims to synthesize copper impregnated mesoporous carbon (Cu/MC) as a catalyst for phenylacetylene carboxylation reaction with CO2 to produce phenylpropiolic acid. The synthesis of mesoporous carbon was performed via the soft template method. The as-synthesized Cu/MC material was characterized by FTIR, SAA, XRD, and SEM-EDX. BET surface area analysis of mesoporous carbon showed that the material has a high surface area of 405.8 m2/g with an average pore diameter of 7.2 nm. XRD pattern of Cu/MC indicates that Cu has been successfully impregnated in the form of Cu(0) and Cu(I). Phenylacetylene carboxylation reaction with CO2 was carried out by varying reaction temperatures (25, 50, and 75 °C), amount of catalyst (28.6, 57.2, and 85.8 mg), type of base (Cs2CO3, K2CO3, and Na2CO3), and variation of support. The reaction mixtures were analyzed by HPLC and showed that the highest phenylacetylene conversion of 41% was obtained for the reaction at 75 °C using Cs2CO3 as a base.
Gelatin Extraction and Characterization from Femur Bones of Bovine and Porcine with Acid Process Purwantiningsih Sugita; Muhamad Rifai; Ambarsari, Laksmi; Rahayu, Dyah Utami Cahyaning; Dianhar, Hanhan
Jurnal Jamu Indonesia Vol. 6 No. 1 (2021): Jurnal Jamu Indonesia
Publisher : Tropical Biopharmaca Research Center, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jji.v6i1.188

Abstract

Gelatin has been widely used as an additive in food industry pharmaceutical, and cosmetic. The similar physical appearance between bovine and porcine gelatin causes an issue for some communities like a Muslim due to awareness of halal food. This study aims to produce gelatin from femur bones of bovines with acid hydrolysis and their characteristics compared to standard gelatin of bovine and porcine. Bovine and porcine bones were soaked in 5% HCl for 10 days and every 2 days a HCl solution was replaced to get ossein. Ossein is hydrolyzed by gradual heating at 65, 75, and 85oC. Gelatin confirmed by the physico-chemical characters, FT-IR and analysis amino acid with HPLC.The results showed that the yield of bovine gelatin was 4.33%. The physico-chemical characters of bovine gelatin resulting from isolation and bovine gelatin standards are in conformity with porcine gelatin standards and meet the requirements of SNI 06-3735-1995 and GMIA. Therefore, bovine gelatin is specifically capable of substituting porcine gelatin for application in the pharmaceutical field. The FTIR spectrum of bovine gelatin shows the presence of amide A, amide I, amide II and amide III groups. The amino acid characters of gelatin were identified as glycine (13.57%) and proline (1.62%) for bovine gelatin and glycine (0.51%) and proline (0.09%) for porcine gelatin.
Isolation and Structural Characterization of Biflavonoids from Araucaria hunsteinii and Araucaria columnaris: Chemotaxonomic and Pharmacological Perspectives Sugita, Purwantiningsih; Ningtias, Widya Sekar Ayu; Priandanda, Rafi Chandra; Ilmiawati, Auliya; Kurniawanti, Kurniawanti; Agusta, Dhea Demitri; Dianhar, Hanhan; Rahayu, Dyah Utami Cahyaning
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 11, No. 2, November 2025
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.v11i2.46173

Abstract

Biflavonoids are a distinctive class of dimeric flavonoids known for their diverse biological activities and chemotaxonomic significance. In this study, two biflavonoids were isolated from the acetone extracts of Araucaria hunsteinii twigs and Araucaria columnaris leaves collected from Bogor Botanical Garden, Indonesia. Chromatographic techniques, including Sephadex LH-20 column chromatography and preparative thin-layer chromatography, were employed for purification, followed by structural elucidation using LC-MS/MS and 1D/2D NMR spectroscopy. The compounds were identified as 4',4''',7,7''-tetra-O-methylcupressuflavone (1) and 7-O-methylcupressuflavone (2). Notably, this is the first report of 7-O-methylcupressuflavone isolated from A. columnaris leaves, providing new chemotaxonomic insights into the genus Araucaria. A literature-based pharmacological analysis revealed promising cytotoxic and α-glucosidase-inhibitory activities of the isolated compounds. These findings contribute to the phytochemical profiling and highlight the pharmaceutical potential of Araucaria-derived biflavonoids.
Phytochemical analysis and antioxidant activity of Araucaria spp. from Taman Bunga Nusantara, Cianjur, West Java, Indonesia PURWANTININGSIH SUGITA; MIRA NUR USTATI; KURNIAWANTI KURNIAWANTI; GUSTINI SYAHBIRIN; HANHAN DIANHAR; DYAH UTAMI CAHYANING RAHAYU
Biodiversitas Journal of Biological Diversity Vol. 26 No. 1 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260113

Abstract

Abstract. Sugita P, Ustati MN, Kurniawanti, Syahbirin G, Dianhar H, Rahayu DUC. 2025. Phytochemical analysis and antioxidant activity of Araucaria spp. from Taman Bunga Nusantara, Cianjur, West Java, Indonesia. Biodiversitas 26: 118-126. Araucaria columnaris (AC) and Araucaria cunninghamii (ACu) are members of the Araucaria genus known for their various pharmacological activities. This study aims to analyze the phytochemical properties, Total Phenolic Content (TPC), Total Flavonoid Content (TFC), and antioxidant activities of twigs from AC and ACu, using different solvents (i) acetone (A); (ii) ethanol (E); and (iii) Ethyl acetate (Ea). Quantitative measurements for TPC, TFC, and antioxidant activity were conducted using the Folin-Ciocalteu method, aluminum chloride colorimetric method, and the DPPH (1,1-diphenyl-2-picrylhydrazyl) assay, respectively. Phytochemical screening indicated the presence of phenolics, flavonoids, steroids, and triterpenoids in all extracts. Saponins were found exclusively in acetone extracts, while none contained alkaloids. The TPC is expressed as mg of gallic acid equivalent (GAE) per g of extract, while TFC is presented as mg of quercetin equivalent (QE) per g of extract. The TPC of AC twigs in acetone (ACA) was the highest, followed by ethanol (ACE) and ethyl acetate (ACEa). Similarly, the highest TPC was also observed in acetone (ACuA) for ACu twigs, followed by ethanol (ACuE) and ethyl acetate (ACuEa). Regarding TFC, the order for AC twigs was ACA > ACEa > ACE, while for ACu twigs, it was ACuEa > ACuE > ACuA. ACuE exhibited strong antioxidant activity with an IC50 value of 29.57 ± 1.11 µg/mL, whereas the other extracts displayed moderate antioxidant activity. The results of this research provide preliminary data that can serve as a foundation for future studies.
Co-Authors Agusta, Dhea Demitri Auliya Ilmiawati GUSTINI SYAHBIRIN HANHAN DIANHAR Hanhan Dianhar Iman Abdullah KURNIAWANTI KURNIAWANTI Kurniawanti, Kurniawanti LAKSMI AMBARSARI MIRA NUR USTATI Muhamad Rifai Ningtias, Widya Sekar Ayu Priandanda, Rafi Chandra PURWANTININGSIH SUGITA Purwantiningsih Sugita Putri Nurul Amalia Yuni Krisyuningsih Krisnandi Yuni Krisyuningsih Krisnandi