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All Journal Biology, Medicine, & Natural Product Chemistry Arfak Chem: Chemistry Education Journal Jurna Beta Kimia Jurnal Penelitian Hasil Hutan
Prastiwi, Dina Alva
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences

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Sintesis Metil Ester sebagai Biodiesel Minyak Biji Kesambi (Schleichera oleosa L.) melalui Esterifikasi dan Transesterifikasi Lailatusholihah, Isna; Suganda, Angga; Mahardika, Micha; Prastiwi, Dina Alva; Situmeang, Boima
Arfak Chem: Chemistry Education Journal Vol. 7 No. 1 (2024): Arfak Chem
Publisher : Universitas Papua, Manokwari, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/accej.v7i1.592

Abstract

Synthesis of methyl ester as biodiesel kesambi seed oil (schleichera oleosa l.) through esterification and transesterification has been successfully conducted. Kesambi seeds are one of the seeds that can produce essential oils, which is about 70%. The methods used in this study are esterification and transesterification. Characterization of methyl ester compound used H-NMR spectrometry The procedure was sample preparation, degumming, esterification, transesterification, and biodiesel quality test. The esterification process had been two steps using a methanol ratio of 20: 1. The biodiesel quality test results are not sufficient from the SNI 04-7182: 2006 standard, where the acid number is 0.718 Mg KOH / g, moisture content 0.32-0.51%, density 840 kg / m3 and viscosity 25.1 Mm2 / s. 
Microemulsion of methanol extract of Tridax procumbens flower and its antibacterial activity against Streptococcus mutans and Enterococcus faecalis Wijayanti, Sri; Pradana, Agrin Febrian; Situmeang, Boima; Prastiwi, Dina Alva; Musa, Weny J.A.
Jurnal Beta Kimia Vol 5 No 1 (2025): Volume 5 Number 1, May 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v5i1.21189

Abstract

Tridax procumbens (commonly known as Gletang flower) is a medicinal plant recognized for its antibacterial potential and is widely distributed across various habitats such as rice fields, plantations, and roadsides. Phytochemical screening of its methanolic flower extract revealed the presence of secondary metabolites, including alkaloids, flavonoids, steroids, phenols, terpenoids, and tannins, all of which contribute to its biological activities. This study aimed to develop a microemulsion formulation of T. procumbens methanolic extract and to evaluate its antibacterial activity against Streptococcus mutans and Enterococcus faecalis, two major oral pathogenic bacteria. The microemulsion was prepared using the sonication method and characterized by assessing its pH, transmittance, viscosity, physical stability, and particle size using a particle size analyzer. Antibacterial activity was tested using the Kirby-Bauer disk diffusion method. The results indicated that the microemulsion had particle sizes ranging from 300–1000 nm and demonstrated significantly higher antibacterial activity compared to the crude extract, suggesting improved solubility and enhanced bioactivity of the active compounds. This formulation holds promise as a natural antibacterial agent for the prevention of oral infections.
Kualitas Ekstrak Akasia dari Berbagai Lokasi di Indonesia dan Efek Penambahan Aditif pada Daya Rekatnya Pari, Rohmah; Aini, Erlina Nurul; Lubis, Yunida Syafriani; Prastiwi, Dina Alva; Santoso, Adi
Jurnal Penelitian Hasil Hutan Vol. 43 No. 2 (2025): Jurnal Penelitian Hasil Hutan
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jphh.2025.5963

Abstract

The tannin characteristic of plants is often influenced by their planting location. The characteristic of tannin potentially affects the quality of tannin-based adhesive. The addition of extender and hardener also influences the quality of tannin adhesive. In this study, we investigated the characteristics of Acacia mangium tannin extract produced from bark obtained from various locations in Indonesia, as well as the bonding quality of tannin adhesive with the addition of an extender and hardener. The objective of this research was to understand the difference in mangium tannin characteristics from different locations and the effect of extender and hardener addition on the bonding strength of acacia tannin adhesive. The Acacia mangium wood barks were obtained from Parung Panjang, Probolinggo, Pontianak, and Muara Enim. The amounts of extender and hardener added were 0%, 2.5%, 5%, 7.5%, 10%, and 0%, 0.5%, 1%, 1.5%, 2%, respectively. The evaluation of mangium tannin bark extract was conducted using the solid content and stiasny number tests. The bonding strength of the tannin adhesive was evaluated through shear strength and wood failure tests of sengon laminated wood. The two-ply sengon laminated wood was fabricated under the following conditions: a glue spread rate of 170 g/m², a cold-press time of 24 hours, and a pressure of 12 kg/cm². Mangium tannin bark extract from Parung Panjang has the best characteristics for adhesive production, i.e., 5.70% solid content and 200.63% stiasny number. The extender and hardener amounts of 7.5% and 1.5%, respectively, produced optimum properties for dry shear strength and wood failure, which meet the JAS No. 234 requirement, i.e., 112.31 kg/cm² and 98–100%, respectively.
Formulation of an Anti-acne Cream Containing Ethanolic Extract of Purslane (Portulaca oleracea) Lailatusholihah, Isna; Prastiwi, Dina Alva; Ni'mah, Afiatun; Yudhistira, Yudhistira
Biology, Medicine, & Natural Product Chemistry Vol 14, No 2 (2025)
Publisher : Sunan Kalijaga State Islamic University & Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/biomedich.2025.142.1379-1384

Abstract

Portulaca oleracea (purslane) is a medicinal plant known for its antibacterial potential due to the presence of bioactive compounds such as saponins, tannins, flavonoids, and alkaloids. This study aimed to formulate an anti-acne cream containing the ethanol extract of P. oleracea and to evaluate its antibacterial activity against Staphylococcus aureus. The extract was obtained through maceration using 96% ethanol, and antibacterial testing was performed using the well diffusion method. The results showed that the ethanol extract demonstrated antibacterial activity, with the highest effect observed in formulation F3, which produced an inhibition zone of 13 mm (strong category). F3 also exhibited desirable physicochemical characteristics, including a spreading diameter of 6.5 cm, viscosity of 14,340 cP, and pH of 5, all of which complied with standard requirements. These findings indicate that P. oleracea ethanol extract has potential as an active ingredient in topical anti-acne formulations.
Co-Authors Adi Santoso Aini, Erlina Nurul Lailatusholihah, Isna Lubis, Yunida Syafriani Mahardika, Micha Musa, Weny J.A. Ni'mah, Afiatun Pari, Rohmah Pradana, Agrin Febrian Situmeang, Boima Sri Wijayanti Suganda, Angga Yudhistira Yudhistira