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All Journal VALENSI The Journal of Pure and Applied Chemistry Research Jurnal Riset Kimia Indonesia Chimica Acta Science and Technology Indonesia Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Journal of Chemistry Indonesian Journal of Pure and Applied Chemistry Acta Chimica Asiana Makara Journal of Science Jurnal Pengabdian Inovasi Masyarakat Indonesia Jurnal Ilmiah Multidisiplin
Emmy Yuanita
Natural Products, Synthesis and Transformation Research Groups, Mataram University, Jl. Majapahit 62 Mataram 83125
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Engineering Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Physics Social Sciences Other

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Synthesis and Characterization of Composites-Based Bacterial Cellulose by Ex-Situ Method as Separator Battery Ulfa, Maria; Noviani, Inda; Yuanita, Emmy; Dharmayani, Ni Komang Tri; Sudirman; Sarkono
Jurnal Penelitian Pendidikan IPA Vol 9 No 6 (2023): June
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i6.3819

Abstract

Many studies have been conducted and developed on cellulose-based battery separator materials, including bacterial cellulose, which has characteristics like plant cellulose. This research aims to synthesize BC/Al2O3 composite and analyze its potential as a battery separator. The synthesis of the composite with the ex-situ method is to immerse BC from tofu liquid waste (fermentation time variation of 6, 7, and 8 days) into Al2O3 suspension. The characterization results showed that the immersion of Al2O3 in BC can increase porosity, electrolyte absorption, and conductivity, indicating that the composite has the potential to be used as a battery separator.
Antibacterial Activity of Marine Sponge (Stylotella sp.) Dharmayani, Ni Komang Tri; Isnaini; Ulfa, Maria; Sudirman; Yuanita, Emmy; Sariningsih, Baiq Nila
Jurnal Penelitian Pendidikan IPA Vol 9 No 6 (2023): June
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i6.3839

Abstract

Sponges are marine biota that makes up coral reefs that live on the bottom of the waters and have an important role in marine ecosystems. Sponges have bioactive components that have not been widely used by the community. This study aimed to analyze the content of secondary metabolites and the antibacterial activity of the sponge Stylotella sp. antibacterial activity test against Gram-negative (-) Escherichia coli and Gram-positive (+) Staphylococcus aureus was carried out using the good diffusion method. The results of antibacterial testing with various concentrations of 50, 100, and 150 ppm of the isolates showed that the zone of inhibition against E. coli was 11.3; 12; and 13 mm while for S. aureus was 12.3; 13; and 14 mm. The results of antibacterial testing with a concentration of 600 ppm of sponge extract showed an inhibition zone on E. coli and S. aureus in the amount of 13.3 and 14 mm, respectively. The test results showed that the sponge extract and isolate were in the intermediate category and were resistant to E. Coli bacteria. and S. Aureus
Black Cumin Seed Extract as Copper Corrosion Inhibitor in H2SO4 1M: An Experimental and Theoretical Study Elsa, Putri; Hamdiani, Saprini; Yuanita, Emmy; Hadisaputra, Saprizal
Jurnal Penelitian Pendidikan IPA Vol 10 No 10 (2024): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i10.8739

Abstract

Experimental corrosion tests and theoretical calculation were conduct to investigate the corrosion inhibition mechanism of black cumin seed extract for copper in 1 M H2SO4 solution. Electrochemical testing using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) method showed that BCS adsorbed to form a protective layer on the copper surface with high inhibition efficiency at 500 ppm concentration (73,35%). Increasing the BCS concentration up to 500 ppm causes the charge transfer resistance increase in the EIS measurement, while the corrosion current density measured by PDP decreases. The values of charge transfer resistance and corrosion current density at 500 ppm BCS are respectively 3687 .cm2 and 2.86 μA.cm-2. The BCS is a mixed inhibitor (anodic and cathodic) that adsorbs physically on the copper surface and obey the Langmuir isothermal adsorption model. Quantum chemical calculation and molecular dynamic simulation show that the studied BCS molecules adsorb strongly on the copper surface with parallel orientation mode. The methyl linoleate (MLIN) molecules from BCS produce the most stable adsorption energy of the other studied compound molecules as a result of molecular dynamic simulation.
Modified Bacterial Cellulose-Based Composite Profile for Drug Release of Tetracycline Hydrochloride Cahyani, Ni Wayan Chyntia Pramesti; Yuanita, Emmy; Dharmayani, Ni Komang Tri; Sudirman, Sudirman; Sudewianingsih, Ni Made; Ulfa, Maria
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 1, May 2024
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.v10i1.37663

Abstract

Bacterial cellulose (BC) is a biodegradable natural polymer with high mechanical strength and non-toxicity. This biopolymer is widely used as a candidate in biomedical fields, such as drug delivery, wound healing, and filtration systems. However, BC lacks antibacterial activity which limits its use in biomedical applications. So, modification of BC-based composite is required. This study aims to examine the effects of modifying BC-based composites with fillers such as graphite (G) and polyvinyl alcohol (PVA) on the release of tetracycline hydrochloride (TCH) drugs. Adding fillers to BC can alter its physical and mechanical properties, reducing its porosity and swelling rate in acidic and alkaline mediums. The drug release of TCH from modified BC-based composites follows the Korsmeyer-Peppas and Hixson-Crowell kinetics models. Adding filler and TCH antibiotic to the composite enhances its antibacterial activity against Staphylococcus aureus with a significant inhibition zone. The results of the inhibition zone show that composites have the potential to be applied in biomedical fields, especially in transdermal patches.
Molecular docking study of mutant levansucrase (E342A) from Bacillus subtilis as a receptor for D-glucopyranose and β-D-fructofuranose ligands: Molecular docking study of mutant levansucrase Aini, Diah Miftahul; Irmayanti, Firda Ade; Yuanita, Emmy; Septiyana, Maulida; Ratnasari, Baiq Desy
Acta Chimica Asiana Vol. 8 No. 2 (2025)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v8i2.262

Abstract

Molecular docking is a widely applied computational approach for predicting the binding modes of small-molecule ligands within the active site of a target protein. This research investigated the interactions of mutant levansucrase E342A from Bacillus subtilis (PDB ID: 1PT2) for β-D-fructofuranose and D-glucopyranose ligands. Using AutoDock Vina, the docking results indicated that β-D-fructofuranose exhibited a higher binding energy of –5.6 kcal/mol, compared to D-glucopyranose with a value of –5.4 kcal/mol, suggesting a more stable interaction. It was supported by the binding interaction analysis of β-D-fructofuranose, which established five hydrogen bonds, including direct interactions with the key catalytic residues Asp86 (2.76 Å) and Asp247 (2.64 Å) that are essential for the enzymatic reaction. In contrast, D-glucopyranose formed four hydrogen bonds, involving Arg360 (3.07 Å) and Glu340 (2.64 Å), with most residues contributing to structural stabilization rather than direct catalysis. These results confirm that β-D-fructofuranose plays a crucial role as a determinant of levansucrase activity in the biosynthesis of levan-type FOS, which are known to exhibit strong prebiotic activity.
Pelatihan dan Penerapan Teknologi Filtrasi Ramah Lingkungan untuk Pengolahan Limbah Pewarna Songket di UMKM Ungga Creative, Lombok Tengah Septiyana, Maulida; Putri, Baiq Yusmiar Aulia; Tsani, M. Khairul; Ningsih, Apriliya; Ramdhani, Restu Agung; Nursofia, Baiq Ike; Ningsih, Baiq Nila Sari; Dharmayani, Ni Komang Tri; Ulfa, Maria; Yuanita, Emmy; Budiana, Irwan
Jurnal Pengabdian Inovasi Masyarakat Indonesia Vol. 4 No. 2b (2025): Edisi khusus Dies Natalis Universitas Mataram
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/4mhjgv27

Abstract

Usaha Mikro, Kecil, dan Menengah (UMKM) Ungga Creative yang berlokasi di Desa Ungga, Lombok Tengah, merupakan UMKM yang berfokus pada produksi kain songket, mulai dari proses pewarnaan benang hingga tahap penenunan. UMKM ini menghadapi permasalahan berupa limbah cair hasil pewarnaan yang berpotensi mencemari lingkungan sekaligus meningkatkan biaya produksi. Oleh karena itu, kegiatan pengabdian ini dilaksanakan untuk memberikan solusi melalui penerapan teknologi pengolahan limbah tekstil berbasis pengendapan tawas dan filtrasi sederhana dengan memanfaatkan media berupa pasir, kain perca, zeolit, dan serabut kelapa. Metode kegiatan Pengabdian kepada Masyarakat ini meliputi penyuluhan mengenai dampak limbah tekstil, pelatihan praktis, serta pendampingan implementasi teknologi. Hasil kegiatan menunjukkan bahwa masyarakat menjadi lebih memahami bahaya limbah pewarna tekstil apabila terpapar ke lingkungan. Selain itu, teknologi filtrasi terbukti dapat diaplikasikan secara langsung pada skala UMKM dan mampu menurunkan intensitas warna serta tingkat kekeruhan limbah, sehingga air hasil olahan dapat digunakan kembali dalam proses pewarnaan. Masyarakat mitra juga mengalami peningkatan pengetahuan dan keterampilan dalam pengelolaan limbah tekstil. Selain memberikan manfaat ekonomi berupa efisiensi penggunaan air, kegiatan ini turut mendukung keberlanjutan usaha dan berkontribusi pada pencapaianSDG 6 (air bersih dan sanitasi layak), SDG 12 (konsumsi dan produksi yang bertanggung jawab), serta SDG 13(penanganan perubahan iklim).
Co-Authors Al Faris, Muhammad Anjartikasari, Nurul Antari, Gladeva Yugi Arshad, Sazmal E. Budiana, Irwan Cahyani, Ni Wayan Chyntia Pramesti Damayanti, Eva Hikmatul Darmayani, Ni Komang Tri Dharmayani , Ni Komang Tri Diah Miftahul Aini Elsa, Putri Eryani, Farica Fajriati, Elza Kamila Fariz Nafiir, Muhammad Haviz, Nur Vinna Hayani, Hafiyatul Hermawati, Elvira I Gede Adhitya Wisnu Wardhana Ima Arum Lestarini Irmayanti, Firda Ade Isnaini Izzaty, Annisa Nabila Jannah, Baiq Khaeratul Maharani Maharani, Maharani Maria Ulfa Maulida Septiyana Mukhlisatun, Mukhlisatun Muliasari, Handa Ningsih, Apriliya Ningsih, Baiq Nila Sari Noviani, Inda Nurpratama, Jeksi Mahari Nursofia, Baiq Ike Putri, Baiq Yusmiar Aulia Ramdhani, Restu Agung Ratnasari, Baiq Desy Retno Ariadi Lusiana Risma, Melania Rohmana, Ainni Saprini Hamdiani Saprizal Hadisaputra Sariningsih, Baiq Nila Septiari, Wayan Uni Sirojuttolibin, Sirojuttolibin Sopiah, Baiq Sri Seno Handayani Sudewianingsih, Ni Made Sudirman Sudirman Sudirman Sukmaningrum, Afif Dwi Surya Hadi Tamara, Cynthia Claudia Taufan Hari Sugara Tri Dharmayani, Ni Komang Tsani, M. Khairul Wahidatun, Wahidatun