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All Journal The Journal of Pure and Applied Chemistry Research Indonesian Chimica Letters al Kimiya : Jurnal Ilmu Kimia dan Terapan
Tinok Dwi Ananda
Chemistry Departement, Faculty Of Mathematics And Natural Science, University Of Brawijaya, JL.Veteran 65145 Malang - INDONESIA
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology Medicine & Pharmacology

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The Effect of NaCl Concentration and Incubation Time on Oxalate and Total Acid in Fermented Cabbage using Various Microorganisms Arie Srihardyastuti; Sasangka Prasetyawan; Radhinal Zikri Firdaus; Fidelia Berenice Prayugo; Yolanda Kresmonia; Tinok Dwi Ananda; Alfi Salamah
The Journal of Pure and Applied Chemistry Research Vol 10, No 1 (2021): Edition January-April 2021
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2021.010.01.568

Abstract

As the highest agrocultural product, cabbage (Brassica oleracea var. capitata) remain consider as perishable vegetable and also known to contain an antinutritional compound, called oxalate.  The oxalate salts is non-soluble compound in water, and thus settle on human kidney. The preservation and improvement of the nutritional aspect of cabbage can be achieved by fermentation through the enzyme production. Therefore, we study the effect of salt addition and incubation time, as the two important factor in commonly cabbage-based fermentation, combined with someoxalate-degrading-bacteria, which wasL. plantarum, L. plantarum – S. cerevisiae, and A. aceti – S. cerevisiae on the oxalate and total acid level in cabbage fermentation. The fermentation was conducted in submerged system at room temperature (25 – 27 °C) with the NaCl concentration addition ranging from 0 – 5% until 10 days. Those condition was carried out for the three types of the tested cultures. The oxalate and total acid level was measured using the permanganometric and acid base titration, respectively. The results indicated that L. plantarum-induced fermentation combined with 3% NaCl during 10 days gave the lowest oxalate level in the fermented cabbage biomass,which was 0.005 mg/100 g FW. Moreover, these single-cultured fermentation was able to produce the highest total acid level in the brine solution, 1.270% at the 8 days of fermentation. This fermentation serves as an alternative method to improve cabbage consumption.
Synthesis and Characterization of Glutaraldehyde-Crosslinked Chitosan for Urea Controlled Release Piluharto, Bambang; Indarti, Dwi; Handoko, Donatus Setyawan Purwo; Ananda, Tinok Dwi
Indonesian Chimica Letters Vol. 3 No. 2 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v3i2.4325

Abstract

Urea exhibits high nitrogen content (∼46%), which is essential for plant growth. However, significant nitrogen losses occur through decomposition, leaching, denitrification, and volatilization. Employing controlled-release systems, such as chitosan membranes crosslinked with glutaraldehyde, can mitigate these losses and enhance fertilizer efficiency. Therefore, this study aimed to develop and characterize chitosan-glutaraldehyde membranes as controlled-release fertilizer systems for urea. Chitosan membranes were crosslinked with varying glutaraldehyde concentrations (0%, 0.4%, 0.9%, 1.3%, and 1.8%) and used to encapsulate urea. The membrane produced was characterized using FTIR and swelling degree assay. The potency of glutaraldehyde-crosslinked chitosan as a urea coating agent was also studied spectrophotometrically using the Nessler reagent. FTIR analysis revealed low intensity of the C=N stretching vibration, indicating limited crosslinking reaction. Additionally, both swelling degree and urea release increased proportionally with increasing glutaraldehyde concentration. These findings suggest limited crosslinking reactions occurred between glutaraldehyde and chitosan within the studied concentration range.
Effect of Molecular Weight of Chitosan in The Coating Solutions on The Shelf Life of Tuna Fish Fillets Indarti, Dwi; Khofifah, Marhamatul; Piluharto, Bambang; Ananda, Tinok Dwi
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 12 No. 1 (2025): June 2025
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v12i1.44715

Abstract

Tuna, a valuable Indonesian marine commodity, is known for its highly valued dietary and nutritional sources. However, this red meat fish is particularly prone to deterioration and spoilage due to its inherent properties. Liquid smoking, a popular fish preservation method in Indonesia, has garnered significant consumer interest but remains insufficient to prevent fish decay entirely. Therefore, this study aimed to enhance tuna fish fillet (TFF) shelf life by developing a novel coating solution. This solution contains liquid smoke seasoning and chitosan with varying molecular weights (MW), as this property affects chitosan’s chemical, physical, and biological characteristics. In this research, fresh tuna were divided into four groups: a control group with no coating, a group with liquid smoke coating only (LS), a group coated using chitosan solution (Ch) with variations of MW (Low: 50-190 kDa, Medium: 190-310 kDa, and High: 210-375 kDa), and a group coated using liquid smoke seasoning with the same chitosan MW variation (Ch + LS). During 15 days of storage in the freezer, their chemical properties (pH, and Total Volatile Base Nitrogen - TVB-N) were analyzed. The finding showed that combining high MW of chitosan and liquid smoke as a coating solution improved TFF appearance, maintaining a desirable uniformly cherry red color. Moreover, this treatment showed a slower increase in pH (5.5 – 5.7) and TVB-N level (22 – 28 mg TVB-N/100 gram), indicating deterioration and spoilage delay during 15 days of storage compared to other treatments. This study underscores the efficacy of a preservation strategy in inhibiting deterioration and spoilage in tuna fish fillets during storage, thereby enhancing product quality and ensuring consumer safety.
Deployment Pattern of Lead (Pb) in Jenggawah Area, Jember, East Java Asnawati; Mintadi, Mukh.; Budiarto, Maria; Pertiwi, Adriana Kusuma; Ananda, Tinok Dwi; Yulvia, Ana
Indonesian Chimica Letters Vol. 4 No. 1 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v4i1.5843

Abstract

The damaging effects of lead (Pb) contamination in soil has been significant public health concern, mainly due to its toxicity. Jenggawah district, located in Jember regency, Indonesia, has experienced growing anthropogenic activity in recent years, leading to the necessity to map the prevalence of this dangerous element in this area. Therefore, this research aims to evaluate the spatial and vertical distribution of lead (Pb) contamination level in the soil of the Jenggawah area. The soil samples were collected using random sampling techniques from seven different locations at various distances from the roadside (0, 25 m, and 50 m) and different depths (0, 15 cm, and 30 cm). Then, the soil sample containing lead (Pb) content were extracted through an acid-based destruction and quantified using Atomic Absorption Spectrophotometry. This study explained that lead (Pb) concentrations in all soil samples from the Jenggawah area were below established thresholds (1 - 8 ppm) and consistently reduced with increasing soil depth.   Additionally, the variation of lead content in terms of distance from the roadside revealed a more fluctuating pattern, possibly affected by ground surface conditions and wind factors. In conclusion, these results can provide environmental information and enhance the understanding of heavy metal risks in areas with moderate anthropogenic activity, such as Jenggawah.
Co-Authors Alfi Salamah Arie Srihardyastuti Asnawati Bambang Piluharto Budiarto, Maria Dwi Indarti Fidelia Berenice Prayugo Khofifah, Marhamatul Mintadi, Mukh. Pertiwi, Adriana Kusuma Purwo Handoko, Donatus Setyawan Radhinal Zikri Firdaus Sasangka Prasetyawan Yolanda Kresmonia Yulvia, Ana