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All Journal International Journal of Science and Engineering (IJSE) GRADIEN Jurnal Riset Kimia Edumatsains IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Jurnal Zarah Science and Technology Indonesia Chimica et Natura Acta SPIN: Jurnal Kimia & Pendidikan Kimia Indonesian Journal of Community Empowerment and Service Aceh International Journal of Science and Technology
Eka Angasa
Department Of Chemistry-Faculty Of Mathematics And Natural Sciences, Universitas Bengkulu
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Pengaruh Konsentrasi Titanium Dioksida (TiO2) dan Ekstrak Etanol Daun Salam (Eugenia Polyantha Wight) terhadap Efektivitas Krim Tabir Surya Berbahan Baku Virgin Coconut Oil (VCO) Tri Firdatuh Rozqiah; Eni Widiyati; Agus Martono Hadi Putranto; Eka Angasa; Dyah Fitriani
Chimica et Natura Acta Vol 11, No 2 (2023)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v11.n2.45155

Abstract

Telah dilakukan penelitian tentang pengaruh konsentrasi titanium dioksida (TiO2) dan ekstrak etanol daun salam (Eugenia polyantha wight) terhadap efektivitas krim tabir surya berbahan baku virgin coconut oil (VCO). Krim tabir surya dibuat dengan cara mencampurkan fase air (gliserin, trietanolamin (TEA), metil paraben, akuades) dan fase minyak (VCO, asam stearat, lanolin, setil alkohol, propil paraben) serta ditambahkan bahan aktif TiO2 dan ekstrak etanol daun salam, lalu diaduk hingga terbentuk krim yang homogen. Krim yang dihasilkan ditentukan karakteristiknya yaitu pH, homogenitas, viskositas, serapan radiasi ultraviolet (UV) dan sun protection factor (SPF). Efektivitas krim tabir surya dapat ditentukan dari SPF yang dihitung. Hasil penelitian menunjukkan bahwa krim yang dihasilkan memiliki susunan yang homogen, pH 7,2-7,75, viskositas 6160-12400 cP. Konsentrasi ekstrak etanol daun salam dan TiO2 berpengaruh terhadap SPF krim. Jika konsentrasi TiO2 dan ekstrak etanol daun salam ditingkatkan, maka SPF krim juga akan meningkat. Krim dengan ekstrak etanol daun salam 1,5% dan TiO2 6% memiliki SPF 2,206 yang menurut food and drug administration (FDA) termasuk dalam tipe proteksi minimal.
USE OF SENGGANI LEAVES AS AN ALTERNATIVE MATERIAL FOR PRINTER REFILL INK THAT IS LOW VOC (VOLATILE ORGANIC COMPOUND) ENVIRONMENTALLY FRIENDLY Trilia Ananta Pramita Sari; Rewan Jayadi; Rika Agustin; Putri Ramanda; Nurhasana; Eka Angasa
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol 8 No 2 (2024): Januari
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v8i2.5574

Abstract

This study aims to determine the content of senggani leaves and utilize senggani leaves as a raw material for printer refill ink. This can increase the utilization of senggani leaves into products that are low in VOC levels. The method used in this study the first test is done, the ink absorption rate test on HVS paper is done by using a medium such as paper by comparing the length of the absorption path ∆x with a time interval t during the absorption process. The next test is the ink performance test using the volume of aqueous solvent and comparing the quality of the ink obtained. The ink consists of 3 components, namely pigment, solvent, and thickening agent the pigment used in this study is carbon obtained from the carbonization of senggani leaves, 98% alcohol is used as a carbon solvent as a thickener and adhesive in the form of gum arabic. The variation of carbon used is 1 gram, 2 grams, and 3 grams, while the volume of aquadest, the volume of alcohol, and gum arabic mass is made fixed that is sequentially 15 mL, 3 mL, and 3.5 grams. The test results of senggani leaf ink with the best composition resulted in solvent and mass variation values by the standard. Meanwhile, from the results of the print test, the resulting printer ink has provided good print and color results as well as commercial ink and does not easily fade if exposed to water. Keywords: senggani leaf, ink, pigment.
Molecular Spectroscopic (FTIR and UV-Vis) Analysis and In Vitro Antibacterial Investigation of a Deep Eutectic Solvent of N,N-Dimethyl Urea-Citric Acid Yudha S., Salprima; Angasa, Eka; Reagen, Muhamad Alvin; Kazi, Mohsin
Science and Technology Indonesia Vol. 9 No. 1 (2024): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.1.167-172

Abstract

The intriguing pursuit of environmentally friendly solvents with tailored properties for diverse applications is a focal point of numerous studies, encompassing precursor selection, thorough characterization, and the exploration of potential applications. The study aims to assess the physicochemical properties and antimicrobial activity of deep eutectic solvents (DES) produced from N,N-dimethyl urea (DMU) and citric acid (CA), highlighting differences from their individual precursors. Various mass ratio variations of (DMU, solid) and (CA, solid) (DMU:CA = 1.0:1.0; 1.0:1.5; 1.0:2.0; 2.0: 1.0; 1.5:1.0) have been tested to make DES solvents through the melt process. Both types of blends generally melt at a temperature of 80°C. The overall liquid resulting from the melting of solids was generally clear in color. Molecular analysis using an infrared spectrophotometer showed some insignificant shifts from one product to another, compared with DMU and CA as precursors. Likewise, analysis using a UV–Vis spectrophotometer, when the entire sample was dissolved in demineralized water (2 mg/mL), showed no difference in the spectrum. In addition, functional group analysis using a spectrophotometer showed some minor changes, mainly shifts in peaks due to changes in the DMU:CA ratio. This may be due to the interaction of the hydrogen donor and the hydrogen acceptor in DES. All samples showed absorption peaks in the ultraviolet region of 202-210 nm. The resulting DES application showed growth inhibitory activity for Staphylococcus aureus and Escherichia coli bacteria in all products produced. The same analysis of the two types of precursors used showed that only CA had activity, but DMU did not have similar activity.
SYNTHESIS AND CHARACTERIZATION OF SnO2 USING JAPANESE PAPAYA LEAF EXTRACT (Cnidoscolus aconitifolius) AS CAPPING AGENT BY HYDROTHERMAL METHOD Amanta, Reyrin Ceria; Nadia Refa Fheronica; Asdim; Banon, Charles; Irfan Gustian; Eka Angasa
SPIN JURNAL KIMIA & PENDIDIKAN KIMIA Vol. 5 No. 2 (2023): Juli - Desember 2023
Publisher : UIN Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20414/spin.v5i2.7859

Abstract

Synthesis of SnO2 has been carried out by using extract of Cnidoscolus aconitifolius leaf as a natural capping agent. The synthesis aims to determine the effect of the use of a capping agent on the crystallinity and the size of crystals. The mass variations of the capping agent used were 5, 10, and 15 gram using the hydrothermal method at relatively low temperature (95-100°C). The synthesized of SnO2 were characterized using FTIR (Fourier Transform Infra Red Spectroscopy) and XRD (X-Ray Difraction). The results of FTIR characterization show the stretching vibration absorption band of Sn-O-Sn in the spectrum with and without capping agent at wave number 599 cm-1 and 599.333 cm-1 . XRD diffractogram shows that SnO2 without a capping agent and using a capping agent has relatively the same crystallinity. Mass variations of 5, 10, and 15 gram resulted in crystals measuring 14.37 nm, 13.75 nm, and 11.78 nm and SnO2 without capping agent measuring 15.93 nm. The results showed that the Cnidoscolus aconitifolius leaf solution could be used as a natural capping agent to produce SnO2. The results of SEM characterization show that aggregate reduction can be seen in the addition of Japanese papaya (Cnodoscolus aconitifolius) capping agent.
SYNTHESIS AND CHARACTERIZATION OF SnO2/ZnO COMPOSITE USING JAPANESE PAPAYA LEAF EXTRACT (Cnidoscolus aconitifolius) WITH HYDROTHERMAL METHOD Puspita, Heni; Agustin, Rika; Asdim; Angasa, Eka; Maryanti, Evi; Martono Hadi Putranto, Agus
SPIN JURNAL KIMIA & PENDIDIKAN KIMIA Vol. 6 No. 2 (2024): July - December 2024
Publisher : UIN Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20414/spin.v6i2.10997

Abstract

SnO2/ZnO composites were synthesized using the hydrothermal method using Japanese papaya (Cnidoscolus aconitifolius) leaf extract. This study aims to determine the effect of using Japanese papaya leaf extract (Cnidoscolus aconitifolius) on the formation of crystallinity and morphology in synthesizing SnO2/ZnO composites. Synthesis was carried out with variations in mass of 5, 10, and 15 grams using the hydrothermal method for 12 hours at 160°C. The results of X-Ray Diffraction (XRD) characterization show that wide diffractogram peaks are identified as the peaks of the SnO2 compound with a tetragonal structure and sharp peaks are identified as the peaks of the ZnO compound. The Fourier Transform Infrared (FTIR) characterization shows the peak wave number of 665 cm-1 which is the Sn-O-Sn strain and the peaks at wave numbers 598 cm-1 and 501 cm-1 which are the Zn-O strain. Characterization of Scanning Electron Microscopy (SEM) in the synthesis of SnO2/ZnO composites after adding Japanese papaya (Cnidoscolus aconitifolius) leaf extract had relatively reduced particle size and aggregate formation compared to no extract. The best effective mass of Japanese papaya leaf extract (Cnidoscolus aconitifolius) is the mass variation of 15 grams with 28.49 nm crystals.
Synthesis and Characterization of Composite Materials Based on Bacterial Cellulose and Fly Ash Yuliah, Maya; Sutanto, Teja Dwi; Maryanti, Evi; Angasa, Eka; Gustian, Irfan
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.2.552-561

Abstract

The synthesis of composite materials based on bacterial cellulose with fly ash (FA) has been carried out based on the mass ratio between bacterial cellulose and fly ash, namely 0.005:4.995; 0.01:4.99; 0.015:4.985, and 0.02:4.98. Bacterial cellulose was obtained from the fermentation of coconut water and fly ash was treated after being obtained from the Steam Power Plant (PLTU) of Bengkulu Electric Power Plant Pulau Baai. The characterization of the composite material that had been formed was analyzed using Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Raman Spectroscopy, and Scanning Electron Microscope (SEM), the results can be validated that the bacterial cellulose composite has been formed with fly ash. The FTIR results also support the XRD results that have been obtained, Raman spectroscopy shows a Raman shift at 1352 cm-1 as an indication of the bending of C-C-H, CH2, and C-OH the highest conductivity was obtained in the variation of 0.02:4.98 which is 2.45×10-3 S/cm. The methanol permeability test obtained was higher along with the addition of fly ash to bacterial cellulose occurred in the composite material variation of 0.02:4.98, which is 3.66×10-9 mol/cm.s. The highest water absorption occurred in the composite material variation of 0.01:4.98 reaching 718% and the results of SEM micrographs with a magnification of 10000× produced a morphology in the form of fibers with fly ash components interwoven by bacterial cellulose fibers.
Pelatihan Pembuatan Es Krim Homemade Sederhana di Desa Taba Air Pauh Kecamatan Tebat Karai Kabupaten Kepahiang Nurwidiyani, Ria; Angasa, Eka; Sutanto, Teja Dwi; Arman, Etriyanto
Indonesian Journal of Community Empowerment and Service (ICOMES) Vol. 5 No. 1 (2025): June 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/icomes.v5i1.41437

Abstract

Pelatihan pembuatan es krim homemade sederhana di Desa Taba Air Pauh Kecamatan Tebat Karai Kabupaten Kepahiang telah dilakukan. Kegiatan ini bertujuan untuk memberikan pengetahuan kimia sederhana serta pelatihan pembuatan es krim untuk anak-anak dan ibu rumah tangga. Es krim termasuk kedalam produk olahan susu yang digemari masyarakat karena memiliki nilai gizi yang tinggi. Meskipun begitu penggunaan bahan tambahan pangan pada es krim harus diwaspadai karena apabila dikonsumsi berlebihan dapat mengakibatkan gangguan kesehatan dalam jangka waktu yang panjang. Oleh karena itu pada pengabdian ini peserta diberikan pelatihan tentang pembuatan es krim homemade yang aman untuk dikonsumsi melalui metode ceramah dan praktek langsung. Hasil kegiatan ini menunjukkan bahwa peserta telah memahami proses pembuatan es krim homemade serta manfaatnya. Diharapkan kegiatan ini memberikan pengetahuan dan bisa meningkatkan ekonomi masyarakat disekitar Desa Taba Air Pauh Kecamatan Tebat Karai Kabupaten Kepahiang
Modified Polystyrene Waste as Cation Exchange Material and Its Characterization Nendo, Felicia Febyola; Sutanto, Teja Dwi; Banon, Charles; Angasa, Eka; Gustian, Irfan
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 11, No 1 (2026): February 2026
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v11.i1.67

Abstract

Modification of polystyrene (PS) waste into sulfonated polystyrene (PSS) as cation exchange material and its characterization has been carried out, the polystyrene waste used is styrofoam from air conditioner packaging. Modification is carried out through the sulfonation process of styrofoam using acetyl sulfate as a sulfonating agent in tetrahydrofuran (THF) solution. Sulfonation is carried out at a temperature of 40 °C for 3.5 hours under nitrogen gas flow. The modified product is then characterized using FTIR, SEM, and testing the degree of sulfonation, water absorption capacity, and cation exchange capacity (CEC). The results show that modification has occurred in the presence of a sulfonate group (–SO₃H) which is characterized by the appearance of characteristic peaks of 1033 cm⁻¹, 1162 cm⁻¹ and 3329 cm⁻¹ in the FTIR spectrum and SEM results show that the PS structure which is not rough and becomes a rougher and non-uniform structure after sulfonation. The degree of sulfonation obtained reached 58%, the maximum water absorption achieved was 39% after soaking for 72 hours, and the highest measured cation exchange capacity was 1.87 meq/g in 1.5 N NaCl solution. These results indicate that styrofoam waste has the potential to be used as a basic material for efficient and environmentally friendly cation exchange resins.Keywords: Polystyrene, Sulfonation, Acetyl sulfate, Cation exchange capacity, Activation energy
Co-Authors A.A. Ketut Agung Cahyawan W Agus Martono Hadi Putranto Amanta, Reyrin Ceria Asdim Charles Banon Dwi Agustini Dwita Oktiarni Dyah Fitriani Dyiah Fitriani Elviyanti, Sutra Eni Widiyati Etriyanto Arman Evi Maryanti Fatimah, Shafaa Bhrenasj G Ghufira Ghufira Ghufira Ghufira Ghufira Ghufira Ghufira H Hairulumah Intan N.S. Napitupulu Irfan Gustian Irfan Gustian Irfan Gustian Irfan Gustian Irfan Gustian Jhoni Ariesta Kazi, Mohsin M Miliani Martono Hadi Putranto, Agus Morina Adfa Nadia Refa Fheronica Nancy Willian Nendo, Felicia Febyola Nesbah, Nesbah Nurhasana Nurwidiyani, Ria Puspita, Heni Putri Ramanda Reagen, Muhamad Alvin Rewan Jayadi Rika Agustin Rika Agustin Sal P Yudha Sal Prima Yudha SALPRIMA YUDHA S Taupik Rahman Taupik Rahman Teja Dwi Sutanto Tri Firdatuh Rozqiah Trilia Ananta Pramita Sari Vivi Sisca Yuliah, Maya