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Jurnal Ilmiah Berkala: Sains dan Terapan Kimia
Published by Universitas Lambung Mangkurat
ISSN : 14111616     EISSN : 25498215     DOI : http://dx.doi.org/10.20527
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
Sains dan Terapan Kimia (Jurnal Ilmiah Berkala) published scientific articles in the Chemistry field which include, but not limited to, research in chemistry, theoretical chemistry, chemistry education, and applied chemistry. This journal also published review articles about the development of chemistry.
Arjuna Subject : Kimia(semua kategori) - Inorganic Chemistry
Articles 6 Documents
 1 
Search results for , issue "Vol 17, No 1 (2023)" : 6 Documents clear
The Effect of Rice Varieties on Silica Purification from Rice Husk Ash as Adsorbent for Mn(II) Mersiana Bria Mosa; Hermania Em Wogo; Dodi Darmakusuma
Jurnal Sains dan Terapan Kimia Vol 17, No 1 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i1.12622

Abstract

The influence of rice types on the purification of rice husk ash was investigated by extracting silica and purifying it with a 12% NaOH solution, followed by the coprecipitation technique. Rice husk samples were from Mbay (Nagekeo Regency) with two different varieties, Ciherang and Inpari 42, and from Soa (Ngada Regency) with Ciherang variety. The silica produced in this research was characterized using UV Vis spectrophotometry to obtain the surface area value. The surface acidity value was calculated using the acid-base titration method. Using XRF, the purity of silica was determined. Ciherang Mbay, Ciherang Soa, and Inpari Mbay had surface area values of 18.397 m2/gram, 18.347 m2/gram, and 18.491 m2/gram, respectively. The surface acidity value of the three samples was 45.1 mmol/gram, 45.5 mmol/gram, and 44.7 mmol/gram, respectively. The purity of silica from rice husk ash Ciherang Mbay, Ciherang Soa, and Inpari Mbay samples based on XRF was 98.6%, 98.3%, dan 99.2%, respectively. Silica with the highest purity (Inpari Mbay variety) was applied as an adsorbent in the adsorption process of manganese (Mn(II)) metal ion with an adsorption capacity of 212.76 µmol/gram and adsorption energy of 38.165 kJ/mol through chemical adsorption. Keywords: purification, rice varieties, silica, adsorption, manganese
Macro and Micro Mineral Composition of Haruan Fish (Channa striata) in Banjar District, South Kalimantan Rahmat Yunus; Dahlena Ariyani; Muhammad Aisy
Jurnal Sains dan Terapan Kimia Vol 17, No 1 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i1.12563

Abstract

Minerals have an essential role in the human body. Information about the mineral content of haruan fish in Banjar Regency is very limited. This research aimed to determine the mineral compound of haruan fish originally from ponds in Banjar Regency. Pond-sourced fish samples were processed until they became powders. The ash compound of haruan fish powder was calculated using the gravimetric method. The mineral compound was analyzed using an XRF spectrometer. Wild haruan fish contained 98.85% macro minerals, with the mineral composition of 14.4% P (10.2 mg/kg), 19.9% Ca (19,9 mg/kg), 60.6% K (42.5 mg/kg), and 0.85% S (0.6 mg/kg). Farmed haruan fish contained 94,76% macro minerals, consisting of 15.6% P (12.9 mg/kg), 17.2% Ca (14.3 mg/kg), 61.1% K (50.8 mg/kg), and 0.86% S (0.7 mg/kg). Wild haruan contained 3.51% micro minerals, consisting of 4.44% Fe (3.7 mg/kg), 0.10% Cu (0.08 mg/kg), and 0.22% Zn (0.18 mg/kg). Farmed haruan contained 4.76% micro minerals, consisting of 4.44% Fe (3.7 mg/kg), 0.10% Cu (0.08 mg/kg), and 0.22% Zn (0.18 mg/kg). Wild haruan fish contained 0.56% trace element, 0.46% Rb (0.32 mg/kg), and 0.1% Re (0.07 mg/kg). Farmed haruan fish contained 0.42% trace element, 0.34% Rb (0.28 mg/kg), and 0.08% Re (0.06 mg/kg).
Corrosion Inhibition Mechanism Based on Adsorption Isotherm Model From Water Extract of Merkubung (Macaranga gigantea) Bark Extract on Mild Steel in Sulfuric Acid Solution Diah Riski Gusti; Nelson Nelson; Intan Lestari; Putri Ramadhanti; Ria Gracia Sibarani
Jurnal Sains dan Terapan Kimia Vol 17, No 1 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i1.9150

Abstract

The phenolic chemicals found in water extract of Merkubung bark (WEMB) can be employed as corrosion inhibitors. The corrosion inhibition mechanism by WEMB can be studied using an adsorption isotherm model. The Langmuir adsorption isotherm model has an R2 value that was closest to 1 one compared to the Freundlich, Temkin, Florry Huggins, and Frumkin adsorption isotherm models, as shown by an analysis of the adsorption isotherm model. Due to the interaction between the WEMB and the steel surface, the adsorption isotherm model reveals that the inhibitor of WEMB on the surface coating of mild steel tends toward chemisorption.
Antioxidant and Antiproliferative Activities of Methanol Extract from Melaleuca cajuputi subsp. Cumingiana [Turcz.] Fruit Isnaini Isnaini; Rosinta Dewi Achmadiyah; Gelvia Awaeh; Husnul Khatimah; Alfi Yasmina
Jurnal Sains dan Terapan Kimia Vol 17, No 1 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i1.13055

Abstract

Melaleuca cajuputi subsp. Cumingiana [Turcz.] Barlow (M. cajuputi) is a plant that is easily found in Banjarmasin. M. cajuputi contains phytochemical compounds in the form of polyphenols including flavonoids, quinons, saponins, and alkaloids that are thought to have antioxidant and antiproliferation activities. The aim of this research was to find out analyze antioxidant and antiproliferation activity of M. cajuputi fruit methanol extract. The antioxidant activity was tested using the DPPH method. The activities were observed in IC50 and were measured using the UV-VIS spectrophotometer at a wavelength of 517 nm. To test the antiproliferation, true experimental with post-test was applied in this research.  Animal used in this study were 30 mature zebras (length > 2.5 cm) which were grouped into 4, namely the negative control group (DMSO 0.05%), the methanol extract group of M. cajuputi with concentrations of 18.5 ppm, 37 ppm and 74 ppm. The bound variable in this study was antiproliferation activity in the tail of an amputated fish. Data analysis was measured by one-way ANOVA and Post-Hoc Tukey HSD tests. Phytochemical results obtained the presence of phenol compounds, cuinons, flavonoids, alkaloids, saponins, tannins, steroids and terpenoids. Methanol extract of Melaleuca cajuputi subsp Cumingiana [Turcz.] Barlow fruit was at IC50 of 15.50 ppm (95% CI 8.31- 32.72).  The antiproliferation activity of zebrafish tails increased in the administration of fruit extract Melaleuca cajuputi subsp. Cumingiana [Turcz.] Barlow in consentration of 74 ppm (p<0.05), both on day 4 and day 8 of measurement when compared to negative controls. It can be concluded that methanol extract of Melaleuca cajuputi subsp Cumingiana [Turcz.] Barlow fruit has antiproliferative activity against the growth of amputated zebrafish tails.
ISOLATION PINOSTROBIN COMPOUND IN TEMU KUNCI (KAEMPFERIA PANDURATA ROXB) RHIZOME Nurul Indriani; Muhammad Eka Putra Ramandha
Jurnal Sains dan Terapan Kimia Vol 17, No 1 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i1.14362

Abstract

Isolation and identification of Pinostrobin compounds in Temu Kunci Rhizomes (Kaempferia pandurata Roxb) were conducted in this study. The isolation and identification methods used were extraction, crystallization & recrystallization, Thin Layer Chromatography, and (4) Infrared (IR) Testing. The extraction results were followed by crystallization and recrystallization processes. The recrystallization produced a yellow solid isolate. A Thin Layer Chromatography test was carried out to determine the purity of the isolate using the eluent Chloroform : n-hexane of 6:4, Chloroform : Ethylacetate of 7:3. A comparison of the Retention Factor (Rf), and the Rf value of the phinostrobin standard indicates that the positive test sample contained the Pinostrobin compound. The Infrared spectrum indicates that the sample belongs to the flavonol group. It is confirmed from the functional groups of the isolates that are compatible or identical to the functional groups in the pinostrobin compound.
Study of Formaldehyde Content in Different Types of Tofu Using Micro Scale Laboratory Based Visible Beam Spectrophotometry Atikah Atikah; Burhanuddin Ronggopuro
Jurnal Sains dan Terapan Kimia Vol 17, No 1 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i1.13948

Abstract

Microscale laboratory is an analytical technique that requires a little reagent and produces a little waste. One application of microscale laboratory is the analysis of formaldehyde content in tofu. Formaldehyde is one of the chemicals that is harmful to the body but is often misused as a food preservative in tofu. This study aims at determining the presence of formaldehyde in tofu using laboratory microscale-based Schiff reagents. The use of microscale laboratories is expected to reduce waste and support the implementation of green chemistry. The method used was a calibration curve using a series of standard solutions of 10 ppm, 15 ppm, 20 ppm, 25 ppm, and 30 ppm with scanning at a wavelength of 561 nm. In the qualitative test, all samples were reactive and showed a purplish red color. In the qualitative test, the highest formaldehyde content in the tofu sample was obtained in the white tofu 3 with a content of 99.7 ppm.

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