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All Journal Journal of Food and Pharmaceutical Science Eksakta : Berkala Ilmiah Bidang MIPA Journal of Food and Pharmaceutical Sciences Jurnal Akademika Kimia
Dinalia, Dinalia
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience

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Synthesis and Characterization of Sodium Aluminate from Aluminum and Sodium Hydroxide Dinalia, Dinalia; Syamsi Aini; Jon Efendi
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 04 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss04/627

Abstract

The synthesis of sodium aluminate from aluminum and sodium hydroxide was successfully conducted to optimize its potential as a precursor for zeolite production. Aluminum was reacted with NaOH solution under continuous stirring for five hours, with variations in pH and Al-to-NaOH molar ratio to determine optimal synthesis conditions. The highest aluminum conversion (94.33%) was achieved at pH 13.6 and an Al-to-NaOH molar ratio of 1:4. Fourier-transform infrared (FTIR) spectroscopy confirmed the formation of tetrahedral [AlO₄]⁻ units through characteristic aluminate vibrational bands at 624 and 727 cm⁻¹. X-ray diffraction (XRD) analysis revealed sharp reflections at 2θ ≈ 34.8°, corresponding to crystalline NaAlO₂ (JCPDS No. 33-1200), indicating high crystallinity and phase purity. Scanning electron microscopy coupled with energy-dispersive X-ray (SEM–EDX) analysis showed irregular plate-like crystalline particles with a near-stoichiometric Na:Al ratio (~1:1), confirming compositional homogeneity. Overall, optimized alkalinity and stoichiometry were found to be critical for producing highly crystalline and compositionally pure sodium aluminate, suggesting its suitability as a high-quality, environmentally friendly precursor for zeolite synthesis.
Atmospheric Corrosion Inhibition of Steel Using Tea Leaf Extract in the Coastal Environment of Air Tawar, Padang Kurniawan, Niko; Saputra, Sabrizal; Dinalia, Dinalia; Yerimadesi, Yerimadesi; safitri, sauli
Jurnal Akademika Kimia Vol. 14 No. 2 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i2.pp123-131

Abstract

This study evaluates the effectiveness of tea leaf extract as a corrosion inhibitor for steel under real coastal atmospheric exposure. The novelty of this work lies in its direct assessment of a plant-derived inhibitor in an open-air marine environment, a setting that has not been adequately addressed in previous studies, which have largely focused on controlled aqueous systems. In addition, this study employs mature tea leaves, an abundant agricultural byproduct with naturally high tannin content, processed through a simple, solvent-free extraction method, thereby offering a sustainable route for green inhibitor development. The extract was obtained from mature tea leaves through aqueous boiling, and its tannin content was quantified using UV–Vis spectrophotometry. ASSAB 760 steel specimens were coated by immersion in tea extract at varying concentrations and soaking durations, followed by natural exposure in a coastal environment for 1 to 30 days. Corrosion behavior was evaluated using the weight loss method. The results showed that mature tea leaves contained the highest tannin concentration (29530.95 ppm), supporting their selection for inhibitor application. The optimum extract concentration was identified as 11000 ppm with a 5-hour immersion time. Under these conditions, treated steel exhibited a substantially lower corrosion rate (7.78 × 10⁻⁵ g/cm²/day) compared to untreated steel (1.66 × 10⁻⁴ g/cm²/day), corresponding to a maximum inhibition efficiency of 84.71%. The inhibition mechanism is attributed to the formation of a stable Fe³⁺–tannin chelate complex that adsorbs onto the steel surface, forming a protective film that restricts the ingress of aggressive chloride-rich moisture in the coastal atmosphere. Overall, the findings demonstrate the practical viability of mature tea leaf extract as an effective and environmentally benign atmospheric corrosion inhibitor, providing field-relevant insight into sustainable protection strategies for marine-exposed steel infrastructure.
Investigation of Column Temperature and Validation of an HPLC-PDA Method for Hydrogen Peroxide Analysis in Hair Cosmetics under Tropical Environments Dinalia, Dinalia; Sosidi, Husain; Ridhay, Ahmad; Hannan, Hannan; Khairuddin, Khairuddin; Satrimafitrah, Pasjan; Syamsuddin, Syamsuddin
Journal of Food and Pharmaceutical Sciences Vol 14, No 2 (2026): J.Food.Pharm.Sci
Publisher : Integrated Research and Testing Laboratory (LPPT) Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfps.26426

Abstract

Hydrogen peroxide (H₂O₂) is widely used as an oxidizing agent in hair cosmetic products, requiring reliable and validated analytical methods to ensure product safety and regulatory compliance. This study investigated the effect of column temperature and validated a high-performance liquid chromatography–photodiode array (HPLC–PDA) method for H₂O₂ determination in hair cosmetic formulations using triphenylphosphine (TPP) derivatization under tropical laboratory conditions. The triphenylphosphine oxide (TPPO) derivative exhibited a stable maximum absorbance at 222 nm within the concentration range of 20–120 ppm, which was selected as the detection wavelength. System suitability was evaluated at ambient temperature, 35, 40, 45, and 50 °C. Column temperatures between 40 and 50 °C fulfilled all system suitability and validation criteria, demonstrating acceptable efficiency, peak symmetry, retention time stability, and reproducibility. Among these conditions, 40 °C was selected as the optimum column temperature based on overall analytical performance and practical considerations. Method validation showed excellent linearity (correlation coefficient r ≥ 0.995; residual variance Vxo ≤ 5%), acceptable precision (%RSD ≤ 2%), and adequate sensitivity, expressed as limits of detection (LOD) and limits of quantification (LOQ). Accuracy evaluation using matrix-spiked samples yielded recoveries within the AOAC acceptance range (90–107%). Overall, the validated HPLC–PDA method at 40 °C with detection at 222 nm is robust and suitable for routine determination of H₂O₂ in hair cosmetic products under tropical conditions.
Investigation of Column Temperature and Validation of an HPLC-PDA Method for Hydrogen Peroxide Analysis in Hair Cosmetics under Tropical Environments Dinalia, Dinalia; Sosidi, Husain; Ridhay, Ahmad; Hannan, Hannan; Khairuddin, Khairuddin; Satrimafitrah, Pasjan; Syamsuddin, Syamsuddin
Journal of Food and Pharmaceutical Sciences Vol 14, No 2 (2026): J.Food.Pharm.Sci
Publisher : Integrated Research and Testing Laboratory (LPPT) Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfps.26426

Abstract

Hydrogen peroxide (H₂O₂) is widely used as an oxidizing agent in hair cosmetic products, requiring reliable and validated analytical methods to ensure product safety and regulatory compliance. This study investigated the effect of column temperature and validated a high-performance liquid chromatography–photodiode array (HPLC–PDA) method for H₂O₂ determination in hair cosmetic formulations using triphenylphosphine (TPP) derivatization under tropical laboratory conditions. The triphenylphosphine oxide (TPPO) derivative exhibited a stable maximum absorbance at 222 nm within the concentration range of 20–120 ppm, which was selected as the detection wavelength. System suitability was evaluated at ambient temperature, 35, 40, 45, and 50 °C. Column temperatures between 40 and 50 °C fulfilled all system suitability and validation criteria, demonstrating acceptable efficiency, peak symmetry, retention time stability, and reproducibility. Among these conditions, 40 °C was selected as the optimum column temperature based on overall analytical performance and practical considerations. Method validation showed excellent linearity (correlation coefficient r ≥ 0.995; residual variance Vxo ≤ 5%), acceptable precision (%RSD ≤ 2%), and adequate sensitivity, expressed as limits of detection (LOD) and limits of quantification (LOQ). Accuracy evaluation using matrix-spiked samples yielded recoveries within the AOAC acceptance range (90–107%). Overall, the validated HPLC–PDA method at 40 °C with detection at 222 nm is robust and suitable for routine determination of H₂O₂ in hair cosmetic products under tropical conditions.
Co-Authors Ahmad Ridhay Hannan, Hannan Husain Sosidi Jon Efendi Khairuddin - Kurniawan, Niko Pasjan Satrimafitrah Safitri, Sauli Saputra, Sabrizal Syamsi Aini Syamsuddin Syamsuddin Yerimadesi