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All Journal Proceedings of Annual International Conference Syiah Kuala University - Life Sciences & Engineering Chapter JURNAL PENELITIAN SAINTIKA Elkawnie Jurnal Kimia Mulawarman Padjadjaran Journal of Dentistry Lantanida Journal Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Jurnal Pendidikan Kimia (JPKim) Indonesian Journal of Chemistry Chemistry Indonesian Journal of Chemical Research Jurnal Ilmu Fisika Journal of Saintech Transfer Denta: Jurnal Kedokteran Gigi JOURNAL OF CHEMICAL NATURAL RESOURCES (JCNaR) Jurnal Natural Jurnal Solusi Masyarakat (JSM) Jurnal Akademika Kimia Holistik Jurnal Kesehatan
Saharman Gea
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Sumatera Utara
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Other

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Synthesis of Carbon Dots From Empty Fruit Bunch Biochar an Acid-Free Hydrothermal Method Marpongahtun Marpongahtun; Rufina Pramudita; Saharman Gea; Amru Daulay
Elkawnie Vol. 9 No. 1 (2023)
Publisher : Faculty of Science and Technology Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v9i1.14524

Abstract

Abstract: Carbon dots have gained much interest due to their outstanding optical and electrical properties, making them useful for a wide range of applications. Here Empty fruit bunch (EFB) biochar was used as a carbon source in a straightforward, environmentally friendly, and reproducible hydrothermal method for producing carbon quantum dots. In this study, the role of the hydrothermal process was seen and studied by comparing the shape and fluorescence. Exciting results from HRTEM show that the carbon quantum dots in the sample are 4 nm in size. The obtained CD emits bright blue luminescence, and the absorption peak of the carbon dots was observed in the UV region with maximum absorption at 205 nm and 322 nm. The light CD shows an intense sky blue color upon illumination by a UV-light source at 365 nm. The intensity of the photoluminescence (PL) spectra sharply increases with decreasing concentration of carbon dots. Meanwhile, the CD exhibited excitation-dependence, photo-stability, and well dispersibility. These results suggest that the present CD are potential applications in optoelectronics and imaging.Abstrak: Karbon dots telah menarik banyak perhatian karena sifat listrik dan optik yang luar biasa, sehingga dapat digunakan untuk berbagai aplikasi. Penelitian ini, menggunakan biochar tandan buah kosong (EFB) sebagai sumber karbon dengan metode hidrotermal yang ramah lingkungan untuk menghasilkan karbon dots. Hasil HR-TEM yang menarik menunjukkan bahwa sampel karbon dots berukuran 4 nm. Karbon dots yang diperoleh memancarkan sinar biru terang dan puncak serapan titik karbon diamati pada spektrofotometri Uv-Vis dengan serapan maksimum pada 205 nm dan 322 nm. Intensitas karbon dots menunjukkan warna biru langit di cahaya UV pada 365 nm. Intensitas spektroskopi luminesens meningkat tajam dengan menurunnya konsentrasi titik karbon. Sementara itu, karbon dots menunjukkan eksitasi, stabilitas, dan dispersibilitas baik. Hasil ini menunjukkan bahwa karbon dots dapat digunakan pada beberapa aplikasi seperti dalam optoelektronik dan pencitraan.
Kandungan Fluoride pada Ikan Teri (Stolephorus commersonnii) dan Potensinya dalam Pencegahan Karies Gigi Mutiara Dewi Pangaribuan; Sondang Pintauli; Saharman Gea
Denta Journal Kedokteran Gigi Vol 19 No 2 (2025): August
Publisher : Fakultas Kedokteran Gigi Universitas Hang Tuah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30649/denta.v19i2.5

Abstract

Background: Dental caries is a common infectious disease that leads to the demineralization and structural degradation of the tooth's hard tissues, caused by acid-producing bacteria such as S. mutans through carbohydrate fermentation. One of the essential strategies for caries prevention is using fluoride to inhibit bacterial activity and enhance enamel remineralization. Anchovy  Stolephorus commersonnii, widely found in Indonesian waters, were rich in calcium and fluoride, particularly in the form of calcium fluoride (CaF₂), which may offer potential benefits in preventing dental caries. Objective: This study aimed to assess the fluoride concentration in S. commersonnii nanopowder to evaluate its potential as a natural source of fluoride for dental caries prevention. Materials and Methods: This research was a descriptive laboratory-based experimental study. The sample was Stolephorus commersonnii (S. commersonnii). The sample was prepared through drying, acid maceration, and high-energy milling to produce nanoparticle powder. Fluoride content was measured using two methods: a colorimetric method with a spectrophotometer and a portable fluoridemeter based on the SPADNS method. Results: The results showed that the fluoride concentration was 21.05 mg/100 g (21.05 ppm) by spectrophotometry and 20.0 ppm using the SPADNS method. The S. commersonnii nanopowder contained 1,305.80 mg/100 g calcium, 281.60 mg/100 g phosphorus, and 91.5% of particles were in the nano size. Conclusion: S. commersonnii nanopowder contains a considerable amount of fluoride and minerals, suggesting its potential as a natural dietary source of fluoride in supporting dental caries prevention strategies.
Co-Authors . Suryati ., Julinawati Abda Abda Abdul Rahman, Syarifah Nur Syed Aditia Warman Aditia, Aditia Warman Agus Haryono Agus Haryono Ahmad Nasir Pulungan Amir Hamzah Siregar, Amir Hamzah Amru Daulay Andriayani APRI H SISWANTO Ariyani, Ariyani Aththorick, T. Alief Averroes Fazlur Rahman Piliang AVERROES FAZLUR RAHMAN PILIANG Ayu, Dinda G. BASUKI WIRJOSENTONO Basuki Wirjosentono Binti Awang, Khalijah Cut Fatimah Zuhra Deddi Prima Putra Dellyansyah Dellyansyah Diana Alemin Barus Diana, Diana Alemin Barus Dwi Indria Cherlina DWI SURYANTO Eddiyanto Eddiyanto EDDYANTO EDDYANTO Elis Anggeria Elisa Putri Elisa, Elisa Julianti Era Yusraini Fenny Aulia Girsang, Ermi Goei, Ronn Grace Nainggolan Hadi Kurniawan, Hadi Hamonangan Nainggolan Harry Agusnar I Putu Mahendra ICHWANA RAMLI Junifa Layla Sihombing Liver Iman Putra Zai Lubis, Muhammad Frassetia Lubis, Yuni Aldriani Maghfirah, Awan Mahyuni Harahap Marpongahtun Marpongahtun, Marpongahtun Mutiara Dewi Pangaribuan Nasution, Halimatuddahliana Nasution, Ismet Danial NONI OKTARI NUR AZIZAH Nurfajriani ., Nurfajriani Nurwijayanti Pai, Woei Wu Larry Pasaribu, Khatarina Meldawati Piliang, Averrous Fazlurrahman Prayugo, Aniza S. Rahayu Rahayu Resmi Pangaribuan Riska Riska Rizky Kurniawan Rufina Pramudita Sembiring, Beby Karina F. Situmorang, Syafrizal Helmi Slamat Tarigan Sondang Pintauli Sopan Sinamo Sovia Lenny SRI RAHAYU Syafruddin Ilyas Syahrul Humaidi, Syahrul Tarigan, Almina Rospitaria Tarigan, Kerista Thamrin . Tiamina Nasution Vivi Purwandari Vivi Purwandari Wesly Hutabarat, Wesly Yanti, Maulida Yasir Arafat Hutapea yeni absah Yuan Alfinsyah Sihombing