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All Journal VALENSI BERKALA SAINSTEK Indonesian Journal of Chemistry
Yuliatun, Leny
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Mathematics Physics

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Invitro Activity of Mineral Trioxide Aggregate Modification from Rice Hull Ash Silica and Calcium Oxide from Clamshells Yuliatun, Leny
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.45789

Abstract

The impact of SrO particles and hydroxyapatite (HA) on the characteristics of Mineral Trioxide Aggregate (MTA) from silica Rice Husk Ash (RHA) and Precipitated Calcium Carbonate (PCC) from clam shell has been studied in this research. Silica and calcium oxide are used as material to form tricalcium silicate (C3S) and dicalcium silicate (C2S) in MTA. Bi2O3 and SrO were added in MTA with 18% (w/w) total percentage. MTA was made with a sol-gel process and used catalyst NH3. After synthesis, material was calcined at 1000 oC for 3 h. HA was added at percentages of 3, 6, and 9% in 5% SrO modified MTA to see the effect of its addition on the material. The modified MTA (MTA-SrO-HA) were hydrated water using water to powder method with ratio of 3:1. The MTA-SrO5/HA6 showed higher compressive strength and dentine interaction to the commercial MTA (Proroot brand) in days 3 and 7. This material had potential as a root canal filling in dental endodontic treatment.
Fabrication of Calcite Calcium Carbonate from Eggshells Biogenic Waste Through Carbonation Method Mariyam, Mariyam; Sunarintyas, Siti; Yuliatun, Leny; Khuzaimah, Ismi; Nuryono, Nuryono
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 11, No. 1, May 2025
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.v11i1.41914

Abstract

Calcium carbonate derived from eggshells has significant potential for use in drug delivery systems, pharmaceutical, food, catalyst, cement, and concrete industries. Although eggshell waste is non-toxic, its excessive accumulation in the environment may contribute to ecological issues. Colonizing pathogenic bacteria in unprocessed eggshell waste poses a potential health risk. The present study outlines the production of precipitated calcium carbonate (PCC) from eggshell waste through a calcination-carbonation process, offering a sustainable approach to its utilization. The calcination was carried out at 900 ºC. The carbonation process was performed in an HNO3 solution, and the NH3 solution was under-treated for 60 minutes. The results exhibited that the precipitated calcium carbonate (PCC) had a purity of 95.2% CaO. It possessed predominantly the calcite phase with a rhombohedral crystal system, as confirmed by the XRD analysis. The crystallite size of PCC was 109.5 nm, measured using the Debye-Scherrer equation. The phase composition of PCC was 99.3% calcite, 0.5% vaterite, and 0.2% aragonite. FTIR analysis further corroborated this data by showing a sharp and unsplit peak at 1419 cm-1, demonstrating the presence of a calcite phase. SEM images revealed a cubic-like morphology, a characteristic of the calcite form of calcium carbonate (CaCO3). The synthesized calcium carbonate in this study holds potential for applications in dental materials and as fillers in polymer matrices for food packaging.
Precipitation, Synthesis, and Characterization of Hydroxyapatite Derived from Gonggong Snail Shells (Strombus canurium) Maritza, Najla; Dewanti, Beauty Suestining Diyah; Yuliatun, Leny
Indonesian Journal of Chemistry Vol 26, No 2 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.107110

Abstract

The gonggong snail shell contains high calcium, reaching 67.70%, which potential to be used as a source of natural hydroxyapatite. Hydroxyapatite can be used as a biomaterial for bone substitutes because it is able to integrate with bone tissue without causing toxic effects or inflammation. The purpose of this study was to analyze the effect of temperature and precipitation synthesis time on the characteristics of hydroxyapatite produced from the gonggong snail shell for bone substitute biomaterials. The results showed that precipitation at 900 °C for 4 h is the best solution for synthesizing hydroxyapatite with a Ca/P ratio of 2.76, closely approximating the stoichiometric value of HAp. SEM revealed that the synthesized HAp exhibited a spherical morphology with a tendency to form granular aggregates. FTIR confirmed the presence of characteristic PO43− and OH− functional groups. XRD analysis indicated that primary phase of the synthesized material was HAp, consistent with JCPDS data. The optimal immersion time and temperature for fabricating at 900 °C for 4 h in HAp:alginate ratio (w/w) of 2.5:7.5 (HAPT2C) based on their mechanical properties. But HAp:alginate ratio (w/w) of 5:5 (HAPT2A) demonstrated higher water absorption compared to HAPT2C in the water uptake test. HAp from gonggong snail shell are promising biomaterial candidates for bone substitution applications, warranting further investigation through in vitro and in vivo biocompatibility studies.
Co-Authors Beauty Suestining Diyah Dewanti Khuzaimah, Ismi Maritza, Najla Mariyam Mariyam Nuryono Nuryono Siti Sunarintyas