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I Wayan Sutapa
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INDONESIA
Chemistry Indonesian Journal of Chemical Research
  • Indonesian Journal of Chemical Research (Indones.
  • Website
Published by Universitas Pattimura
ISSN : 23385359     EISSN : 26142627     DOI : 10.30598//ijcr.2021.-irm
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemistry Engineering Environmental Science
Indo. J. Chem. Res. is a journal that regularly publishes primary articles covering all branches of chemistry and its sub-disciplines. Published articles consist of complete research, short communication, and review articles. The scope of published articles is not limited to inorganic chemistry, physical chemistry, organic chemistry, analytical chemistry, and biochemistry. Editors can invite articles review of authors that includes the latest developments in the field of interest of certain chemicals. A contribution is open to researchers from all countries.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 314 Documents
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Carbon Dots Synthesis from Soybean with Urea Doped As Sensitive Fe(II) Ion Detection Barus, Diana Alemin; Ginting, Riski Titian; Faizah, Anindya Chandra; Shafira, Rifa Dwi; Nainggolan, Kevin
Indonesian Journal of Chemical Research Vol 10 No 3 (2023): Edition for January 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.10-bar

Abstract

Synthesis of carbon dots from soybeans with urea doped (N-CDs) has been successfully conducted using the bottom-up approach via the hydrothermal method. The N-CDs showed a dark brown solution, indicating the carbon dots formed. This study analyzed the effect of optical properties before and after Fe (II) ions addition on the sensitivity of N-CDs. N-CDs characterizations were analyzed using UV-Vis Spectrophotometer and Photoluminescence Spectroscopy (PL). The results showed that the absorbance spectrum range is from 200 to 600 nm, with its absorbance peak at 290 nm. The band gap energy obtained is 3.32 eV, which indicates that N-CDs are semiconductors. The N-CDs solution resulted in good fluorescence when observed under ultraviolet light (395 nm) and emitted a bright green color. N-CDs' sensitivity when sensing Fe (II) ions with a minimum Limit of Detection (LOD) is as low as 5.7 nM. Thus, N-CDs can be used as biosensors with an easy and environmentally friendly method.
Antibacterial Activity and Toxicity of Honey Derived from Bone, South Sulawesi, Indonesia Zakaria, Zakaria; Misriyani, Misriyani; Astuti, Ayun Dwi; Masyita, Ayu
Indonesian Journal of Chemical Research Vol 10 No 3 (2023): Edition for January 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.10-zak

Abstract

Honey is a sweet substance produced by honey bees from the nectar of flowers or other parts of plants. Honey obtained from Bone, in South Sulawesi, has been extracted and tested for antibacterial activity and toxicity. Honey was macerated with methanol to obtain a crude extract. Methanol crude extract was then partitioned successively with n-hexane and ethyl acetate to obtain ethyl acetate and methanol fraction. Antibacterial activity test was performed by agar diffusion method against Escherichia coli and Staphylococcus aureus. Methanol extract, ethyl acetate fraction, and methanol fraction showed an inhibition zone against E. coli at 10.10, 10.05, and 8.40 mm, respectively with amoxicillin as a positive control (20.05 mm). Also against S. aureus, inhibition zone was obtained at 11.90, 9.30, 8.60, and 13.70 mm for methanol extract, ethyl acetate fraction, methanol fraction, and amoxicillin, respectively. The greatest inhibition zone was obtained from methanol extract against E. coli and S. aureus, both including the strong category. The LC50 value of methanol extract and methanol fraction was 273.57 µg/ml and 765.66 µg/ml, respectively, categorized as toxic against Artemia salina, while ethyl acetate fraction was not toxic.
Solid Dispersion of Acetosal Using Polyvinyl Pyrrolidone (PVP) K-30 in Tablets with Direct Compressing Method Khasanah, Khuswatun; Nawangsari, Desy; Kusuma, Ikhwan Yuda
Indonesian Journal of Chemical Research Vol 10 No 3 (2023): Edition for January 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.10-kha

Abstract

Acetosal is classified in the Biopharmaceutical Classification System (BCS) class II (low solubility, high permeability). Low solubility causes a decreased dissolution rate. Polyvinyl pyrrolidone (PVP) K-30 is an inert carrier easily soluble in water and can influence the solubility of a drug substance. Efforts to increase the solubility of acetosal make a solid dispersion system. This study aims to determine the effect of the solid dispersion system of acetosal: PVP K-30 on dissolution rate, the ratio of the solid dispersion with the best dissolution rate, and the physical properties of acetosal tablets formed in the dispersion system. Solid dispersions using the dissolving method with variations in the concentration of acetosal: PVP K-30 1:1, 1:3, and 1:5. The results of the dissolution test of acetosal in solid dispersion powder, i.e., PVP Formula 1:5, which has the highest dissolution percentage compared to formula 1:1 and 1:3 with the concentration this formula was 140.96 mg, dissolution percentage was 28.19±0,63% in 30 minutes. Statistical results by ANOVA test show a significant difference of 0.044 (p<0.05). The physical properties of tablets with a dispersion system show higher addition of PVP K-30. This result is related to slower disintegration time and lower friability.
The Phenolic, Flavonoid, and Anthocyanin Content From Methanol Extract of Senggani Fruit and Its Antioxidant Activity Purwaningsih, Indah; Fathiah, Fathiah; Amaliyah, Nurul; Kuswiyanto, Kuswiyanto
Indonesian Journal of Chemical Research Vol 10 No 3 (2023): Edition for January 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.10-pur

Abstract

Senggani fruit is an edible fruit that tastes sweet, has an attractive color, blue or reddish purple, and is thought to contain anthocyanin. The senggani fruit can be used as a source of natural dyes and is known to have active components as a source of antioxidants. This study aimed to measure the phenolic, flavonoid, and anthocyanin content and the antioxidant activity of the methanol extract of senggani fruit. Senggani fruits were extracted by maceration using methanol. The phytochemical screening test was performed. The phenolic, flavonoid, and anthocyanin content was measured using the Folin-Ciocalteu, AlCl3, and pH differential, respectively. The antioxidant activity test was carried out using the DPPH method. The phytochemical screening test showed the methanol extract of senggani fruit contained phenols, flavonoids, alkaloids, saponins, and tannins. In this study, the total phenol content was 154.880 mg GAE/g, the total flavonoid content was 6.827 mg QE/g, and the anthocyanin level was 7.516 mg/100 g. The antioxidant activity using the DPPH method showed that the methanol extract of senggani fruit had moderate antioxidant activity, with an IC50 value of 99.79 ppm.
Molecular Networking to Screen Macroalgal Secondary Metabolites: Case for West Timor Macroalgae Turupadang, Welem; Johanis, Marskel
Indonesian Journal of Chemical Research Vol 10 No 3 (2023): Edition for January 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.10-tur

Abstract

The research describes how molecular networking was used as a screening tool to prioritize the isolation workflow of 40 macroalgae sampled from West Timor waters, Indonesia, in addition to a Nuclear Magnetic Resonance-based (NMR) spectroscopy strategy. A mass spectrometry (MS) was employed to generate spectra that later be used as data to produce the molecular network with the Global Natural Product Social Molecular Networking (GNPS) website. The screening process used the molecular network, which assisted in the selection of six samples of macroalgae out of the 40 samples for further examination. Lastly, an NMR-based protocol was employed to choose the samples of interest to be investigated further. Six samples were shortlisted from the GNPS molecular network based on specimens, which were then validated with 1H NMR spectroscopy to finally prioritized three samples.
Adsorption of Indigo Carmine Dye and Copper Ion by Kaolin from Bangka Island Tahya, Candra Yulius; Cornelia, Melanie; Siregar, Tagor M.; Karnelasatri, Karnelasatri
Indonesian Journal of Chemical Research Vol 11 No 1 (2023): Edition for May 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.11-tah

Abstract

Indigo Carmine (IC) is a synthetic dye that might promote irritations, vomiting, and diarrhea when orally consumed in high concentrations. Copper is a dangerous heavy metal that tends to accumulate in organisms' cells as a pollutant. Hyperproduction of IC and accumulation of copper in water could cause an environmental problem that must be adequately addressed. Kaolin is found abundant on Bangka Island. Based on XRD analysis, Kaolin Island from Bangka Island consists of two important minerals, Kaolinite and Rectorite. Kaolin has chemical and physical properties, which make it useful in several applications, including as an adsorbent. This study aims to evaluate how Kaolin can adsorb copper ion from acid wastewater (pH < 0.5) and determine natural Kaolin's ability to adsorb IC dye from an aqueous solution. Many factors, including mixing time and number of doses of Kaolin, influence Kaolin's ability to absorb IC. The longer the stirring time, the more IC is absorbed. The optimal temperature for IC adsorption is 25˚C. The optimal kaolin dose for IC adsorption is 20% (m/v). Copper concentration after application of Kaolin tends to decrease, with optimal at 25.09% (m/v) dosage for 19.23% copper removal.
Antioxidant Profiles of Chitosan-Alginate Films with Addition of Moringa oleifera Leaf Extract for Active Packaging Riyandari, Baiq Amelia; Multazam, Multazam
Indonesian Journal of Chemical Research Vol 11 No 1 (2023): Edition for May 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.11-riy

Abstract

This research aims to study the antioxidant activity of chitosan-alginate films by adding Moringa oleifera leaf extract. These films will be applied as active packaging for food. This research was initiated by the extraction of Moringa oleifera leaves. The Moringa oleifera leaves extract was prepared maceration and soxhletation techniques using distilled water as a solvent. The maceration method is resulting the yield 6.97%, while the yield of extract from the soxhletation method was 8.57%. After the extraction process, screening phytochemicals of Moringa oleifera leaves extract was tested to identify secondary metabolite compounds. Screening phytochemicals of the extract showed that Moringa oleifera extract contains alkaloids, flavonoids, tannins, and saponins. Synthesizing of films was conducted at room temperature through a homogenization technique using a hot plate stirrer. The variations of final concentrations of extract were 0% (film A0), 0.50% (film A1), 0.75% (film A2), and 1.00% (film A3). Based on the antioxidant activity test using DPPH, the % RSA value of films with the addition of extract from soxhletation method was higher than films with the addition of extract from the maceration technique. The highest percentage of RSA value was 43.65% from A3 film with the extract's final concentration of 1.00%.
Characterization and Identification Compounds of Liquid Smoke from Used Tire Waste Pyrolysis Lombok, Johny Zeth; Anom, I Dewa Ketut
Indonesian Journal of Chemical Research Vol 11 No 1 (2023): Edition for May 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.11-lom

Abstract

Research on compounds from liquid smoke resulting from the pyrolysis of used tire waste has been conducted. The results of tire pyrolysis produce liquid hydrocarbons and charcoal which can be utilized and developed into more useful materials or finished goods. This study aims to identify the compound components of liquid smoke resulting from the pyrolysis of used tire waste. The research begins with manufacturing a pyrolysis tool based on the principle of dry distillation. The pyrolysis process is carried out by heating at high temperatures. Liquid smoke analysis was carried out using GC-MS. In contrast, the components of the compound were identified and characterized by comparing the mass spectrum data obtained with the mass spectrum data in the GC-MS library. The results showed that the pyrolysis of 6 kg of used tires produced 1500 mL of liquid smoke. Analysis of liquid smoke by GC-MS produced 88 chromatogram peaks, with the most dominant peak height at peaks 3, 17, 37, 38, 72, and 73. The most dominant compound component identified by MS spectrum analysis is 2-propanone (peak 3), 4-methyl-2-pentanone (peak 17), ethyl-benzene (peak 37), 1,2-dimethyl-benzene (peak 38), 1-methyl-4-(1-methyl ethyl)-benzene (peak 72) and limonene (peak 73).
The Effect of Fermentation on the Characteristics and Antioxidant Activity of Wuluh Starfruit Leaf Kombucha Tea (Avverhoa bilimbi Linn.) Rosyada, Fanny Fajrin Aulia; Agustina, Eva; Faizah, Hanik
Indonesian Journal of Chemical Research Vol 11 No 1 (2023): Edition for May 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.10-agu

Abstract

Kombucha is a fermented drink that provides health effects. Wuluh starfruit leaves are one of the ingredients that can be used in making kombucha. This study was conducted to determine the effect of fermentation time on the physical, chemical, and antioxidant characteristics of wuluh starfruit leaf kombucha tea (Avverhoa bilimbi Linn.). This research is an experimental study with a completely randomized design (CRD) consisting of 4 treatments. Kombucha wuluh starfruit leaves are made with a fermentation time of 0, 4 8, and 12 days. The physical characteristics tested include an organoleptic test of scent, color, and taste. The chemical characteristics tested include pH, levels of titrated acids (tta), phenolic, and alcohols. The antioxidant activity is known by determining the value of IC50. Organoleptic, pH, tat, and phenolic assessment data were statistically analyzed using Kruskal Wallis and Mann Whitney. Alcohol content and antioxidant activity were analyzed descriptively. The best result of physical, and chemical characteristics and antioxidant activity are on the 12th day of fermentation with a pH of 3, TTA 0.11 0.070%, phenolic 87.33 1.140 mg/ml GAE and alcohol of 0.41% with an IC50 value of 3.65 ppm.
Synthesis and Characterization of Silica Gel from Palm Shell and Coir Ash Sunarti, Sunarti; Mariwy, Abraham; Laitupa, Asasa N.
Indonesian Journal of Chemical Research Vol 11 No 1 (2023): Edition for May 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.11-mar

Abstract

This study aims to determine the composition of the oxide, the characteristics of palm shell and coir, and silica gel synthesized. The oxide composition, crystallinity, palm shell and coir ash functional groups were analyzed using XRF, XRD, and FTIR. Analysis of the functional groups and crystallinity using FT-IR and XRD. The results showed the composition of SiO2 in palm shell and coir ash was 76%, and SiO2 in the form of quartz and cristobalite was more dominant than amorphous SiO2. The synthesis success was indicated by the appearance of peaks with low intensity, not sharp, and resembling bumps on the synthesized silica gel diffractogram, which is an amorphous SiO2 characteristic. This result is confirmed by FT-IR, where absorption at wave number 455 cm-1 is a Si-O-Si bending vibration, 783 cm-1 is a stretching vibration of Si-O symmetry of Si-O-Si, 3454.51 cm-1, and 3568 cm-1 with fairly high intensity are characteristic of the -OH group from Si-OH. The wide and sharp absorption at 1083.99 cm-1 is a stretching vibration of the Si-O symmetry of Si-O-Si, 1625.99 cm-1 is -OH vibration of water molecule, 798.53 cm-1 is Si-O stretching vibration of Si-O-Si and absorption of 462.92 cm-1 indicates bending vibration of Si-O-Si.

Page 22 of 32 | Total Record : 314

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