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All Journal VALENSI Jurnal Sains Materi Indonesia Eksergi: Chemical Engineering Journal Science and Technology Indonesia IDJP (Indonesian Journal of Pharmaceutics) Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Jurnal Material dan Energi Indonesia

Iman Rahayu

Departemen Kimia, FMIPA, Universitas Padjadjaran

Author-ID : 768596

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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Silica from Natural Sources: a Review on the Extraction and Potential Application as a Supporting Photocatalytic Material for Antibacterial Activity Annisa Luthfiah; Yusi Deawati; M. Lutfi Firdaus; Iman Rahayu; Diana Rakhmawaty Eddy
Science and Technology Indonesia Vol. 6 No. 3 (2021): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Silica has become a popular material due to its high abundance and many advantages in various fields. This material can be produced synthetically and extracted from nature with resultant advantages in the application of green production. Therefore, this article deals with the form of silica extracted from quartz sand, leaves, and agricultural wastes found in nature. The extraction process from various sources would be described using thermal, biological, and chemical methods. This review also highlights the potential application of silica as a photo catalytic antibacterial-supporting material and discusses its role in increasing the effectiveness of the process. The discussion was continued with research on this procedure, where synthetic auxiliary materials were compared to the extracted silica. Furthermore, results obtained indicated that the extracted material had very good potential as a photocatalyst adjunct in its application in the antibacterial field.

SINTESIS NANOPARTIKEL MAGNETIK DENGAN METODE KOPRESIPITASI TOGAR SARAGI; BAYU PERMANA; MALA SAPUTRI; LUSI SAFRIANI; IMAN RAHAYU; RISDIANA RISDIANA
Jurnal Material dan Energi Indonesia Vol 7, No 02 (2017)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Nanopartikel magnetik, oksida besi magnetit (Fe3O4), merupakan material yang menarik untuk dikembangkan. Material ini sangat potensial untuk dapat diaplikaikan secara luas diberbagai bidang seperti untuk diagnosa medik. Namun, untuk menghasilkan Fe3O4 berukuran nano (10-100 nm) masih sulit untuk dilakukan. Pada penelitian ini telah berhasil disintesis nanopartikel Fe3O4 dengan menggunakan metode kopresipitasi. Sintesis dilakukan menggunakan prekursor Ferrous Chloride Tetrahydrate (FeCl2.4H2O) dan Ferric Chloride Anhydrous (FeCl3.6H2O) dengan perbandingan ion ferrous dan ion ferric adalah 1:2. Kemudian, Ammonium Hidroksida (NH3.H2O) digunakan sebagai bahan presipitan. Morfologi partikel dari sampel dikarakterisasi menggunkan Transmission Electron Microscope (TEM).Berdasarkan hasil karakterisasi TEM diperoleh morfologi partikel berbentuk bulat dengan ukuran rata-rata berkisar 10 nm

Konduktivitas Apatit Lantanum Silikat La9.33Si6O26 Hasil Sintesis Hidrotermal dengan Mineraliser NaOH dan KOH Atiek Rostika Noviyanti; Dani Gustaman Syarif; Riansyah Amynurdin; Iwan Hastiawan; Iman Rahayu; Yati B. Yuliyati
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 1 (2018): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.1.8468.1-15

Apatit lantanum silikat banyak digunakan sebagai elektrolit pada sel bahan bakar padatan (SOFC). Beberapa oksida apatit lantanum silikat La9.33Si6O26 telah disintesis dengan metode hidrotermal guna mengamati pentingnya peranan mineraliser terhadap karakternya. Penelitian ini bertujuan untuk mengetahui pengaruh jenis dan konsentrasi mineraliser terhadap kristalinitas, ukuran partikel dan hubungannya dengan sifat konduktivitas oksida apatit lantanum silikat. Struktur, ukuran partikel dan konduktivitas oksida apatit masing-masing dikarakterisasi dengan XRD, PSA dan spektroskopi impedansi. Oksida apatit lantanum silikat diperoleh dengan melarutkan La2O3 dan Na2SiO3 dengan mol ratio 1,555 menggunakan mineraliser NaOH (3-5 M) dan KOH (0,3-0,7 M). Hasil penelitian menunjukkan bahwa kinerja elektrolit sangat ditentukan oleh kristalinitas dan morfologi apatit lanthanum silikat yang dipengaruhi oleh jenis dan konsentrasi mineralizer. Ukuran apatit lantanum silikat terkecil diperoleh dari hasil sintesis dengan menggunakan mineraliser NaOH 3 M yaitu 1,7889 µm, dengan nilai konduktivitas tertinggi yaitu 1,99×10-6 S/cm pada suhu operasi 600 ºC. Berdasarkan hasil tersebut NaOH 3 M merupakan mineraliser yang paling baik untuk menghasilkan apatit lanthanum silikat La9.33Si6O26.Conductivity of Lanthanum Silicate Apatite Phase of La9.33Si6O26 Prepared by Hydrothermal Synthesis using NaOH and KOH as Mineralizer. Lanthanum silicates are used as electrolytes in solid oxide fuel cells (SOFC). Some oxide-based apatite has been synthesized by hydrothermal method to observe mineralizer effect on the process of crystallization. The effect of type and amount of mineralizers for preparing apatite –type lanthanum silicate of La9.33Si6O26 was investigatedon its crystallinity, particle size, as well as on the conductivity properties relationship were investigated. The structure, particle size and conductivity of La9.33Si6O26 was characterized using X-ray diffraction, particle size analyzer and impedance spectroscopy respectively. The results show that the electrolyte performance is strongly dependent on the crystallinity and the morphology textural of lanthanum silicate apatite affected by the type and amount of mineralizer. The lanthanum silicate apatiteprepared by La2O3 and Na2SiO3 (molar ratio of La2O3 and Na2SiO3 = 1.555), and NaOH (3; 4; 5 M) and KOH (0,3-0,7 M) as mineralizer. As a result, apatite-type lanthanum silicate was prepare using NaOH 3 M shows smallest particle (1.7889 μm) and highest conductivity (1.99 × 10-6 S / cm at 600 ºC). With respect to both particle size and conductivity, the NaOH 3 M can be selected as a suitable type and amount mineralizer for the preparation of excellent lanthanum silicate apatite La9.33Si6O26.

Protein Modelling Insight to the Poor Sensitivity of Chikungunya Diagnostics on Indonesia’s Chikungunya Virus Bevi Lidya; Muhammad Yusuf; Umi Baroroh; Korry Novitriani; Bachti Alisjahbana; Iman Rahayu; Toto Subroto
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.79301

Sensitive detection of infectious diseases is crucial for effective clinical care. However, commercial rapid tests may be limited in their ability to detect pathogen variants across different countries. It was found that the sensitivity of a chikungunya rapid test on local strain was only 20.5% as compared to the East, Central, and South Africa (ECSA) phylogroup. Therefore, the development of geographically specific diagnostics is essential. Investigating the distinctive structural properties of a locally sourced antigenic protein is an important initiative for the development of a specific antibody. This study utilized structural bioinformatics and molecular dynamics simulations to investigate the differences between the E1-E2 antigenic proteins of the Indonesian chikungunya virus (Ind-CHIKV) and that of ECSA. The results showed that some of the mutation points are located at the antibody binding sites of Ind-CHIKV. G194S and V318R mutations were proposed as distinctive features of Ind-CHIKV, leading to weaker antibody binding compared to ECSA. It suggests that modifying the antibody to accommodate bulkier side chains at positions 194 and 318 could improve its effectiveness against Ind-CHIKV. These insights are valuable for developing a highly sensitive immunoassay for Ind-CHIKV and other regional pathogens, ultimately enhancing diagnostic capabilities in Indonesia.

Co-Authors Ace Tatang Hidayat Achmad Zainuddin Ade Sholeh Hidayat Anis Yohana Chaerunisaa Anni Anggraeni Annisa Luthfiah Annisa Wijayati Atiek Rostika Noviyanti Bachti Alisjahbana BAYU PERMANA Bevi Lidya Budiman, Yudha Prawira Dani Gustaman Syarif Dewi Astrid Diana Rakhmawaty Eddy Febrina Tri Hartanti Haryono Haryono Iman Permana Maksum Inky Febrianti Iwan Hastiawan Korry Novitriani Lusi Safriani M. Lutfi Firdaus MALA SAPUTRI Margaretha Efa Putri Marline Abdassah Muhammad Yusuf R. Ukun M.S. Soedjanaatmadja Reinanda Hanapratiwi Riansyah Amynurdin Risdiana Risdiana Rita Mulyasari Rubianto A. Lubis Rukiah Rukiah Rustaman Rustaman Saadah Diana Rachman Sahrul Hidayat Sri Pujiastuti Sudirman Sudirman Sunit Hendrana Sunit Hendrana Sunit Hendrana Togar Saragi, Togar Toto Subroto Umi Baroroh Yandhitra H. Rustam Yati B. Yuliyati Yati B. Yulyati Yusi Deawati

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