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Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.)

ijcs
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Published by Indonesian Scholar Society

ISSN : 2830778X EISSN : 28307658 DOI : https://doi.org/10.55749/ijcs.v1i1

Core Subject : Science,

Chemistry

Indonesian Journal of Chemical Studies (IJCS) is a peer-reviewed, open-access journal that publishes original research articles, review articles, as well as short communication in all areas of basic and applied chemistry. IJCS was managed & published by the Indonesian Scholar Society. This journal is published 2 times a year, namely every June and December. IJCS covers the following topics, but is not limited to: Organic and Inorganic Chemistry; Physical and Theoretical Chemistry; Analytical and Electroanalytical Chemistry; Materials and Polymer Chemistry; Supramolecular Chemistry; Organometallic Chemistry; Coordination Chemistry; Biomolecular Chemistry; Natural Products and Medicinal Chemistry; Electrochemistry; Environmental Chemistry; Propellant Chemistry; and Chemistry for Defense.

Arjuna Subject : Kimia(semua kategori) - Inorganic Chemistry

Articles 27 Documents

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Identification of Tropical Marine Diatom Chaetoceros dayaensis CBO from Bokor Island through Morphology and Genetic Marker Analysis Stiawan, Elva; Sutomo, Sutomo; Sapulete, Sherly; Nurachman, Zeily; Rachmayanti, Yanti
Indonesian Journal of Chemical Studies Vol. 1 No. 1 (2022): Indones. J. Chem. Stud., June 2022
Publisher : Indonesian Scholar Society

Microalgae are well-recognized by many researchers working on bioenergy resources due to its capability to produce high amounts of lipids as biodiesel precursors. Diatoms as a group of microalgae that specifically categorized by their silica valve could be more attractive to the researchers because in addition to high-lipid content, their silica features can be also utilized for wider applications, or used for diatoms bioproduct purification. Identification of some diatom species, such as the diatom genus Chaetoceros, as an initial step in diatom studies were difficult to accurately perform because of the unique morphology of silica frustules. Meanwhile, some candidate universal genetic markers of microalgae could also be used for the identification of diatoms with brittle frustules. In this research, we aimed to identify isolate CBO of tropical marine Chaetoceros CBO strain using morphological and genetic approaches. The isolate CBO of Chaetoceros sp. CBO was successfully obtained from sea region of Bokor Island, Kepulauan Seribu, Jakarta, and cultivated in our laboratory as culture stock for further use. Better resolution of the Chaetoceros CBO identification until species level was shown by genetic analysis toward two proposed gene markers for microalgae (rbcL-3P and V4 region of 18S rDNA) rather than by morphological. Specific DNA region for this specimen was found in V4 region of 18S rDNA genetic marker that could be recognized by MspA1I restriction enzyme. Hence, the RFLP (restriction fragment length polymorphism) method could be also used as an initial diagnostic tool for identification of this tropical marine Chaetoceros dayaensis CBO and for stock culture labelling purposes.

Effect of Acid-Based Level on Storage Acrylic Emulsion Paint Hutapea, Henny; Sembiring, Yulia Shara; Setna, Nathanael
Indonesian Journal of Chemical Studies Vol. 1 No. 1 (2022): Indones. J. Chem. Stud., June 2022
Publisher : Indonesian Scholar Society

In the present study, a novel methodology was developed for the assessment of acid-based effect levels on the storage acrylic emulsion paints., It was found that the acrylic emulsion paint was clumping and smelled bad on the organoleptic test. Most bacterial growth on the microbiological test. This occurred in the acrylic emulsion paint sample which had a pH level of 7. Microbiological checking found little bacterial growth in the paint which had a level of pH 9, which is relatively safe in the storage process for 30 days and has good results in organoleptic and microbiological tests.

Novel Absorber Material Design Based on Thiazole Derivatives Using DFT/TD-DFT Calculation Methods for High-Performance Dye Sensitized Solar Cell Nurrosyid, Naufan; Fahri, Mirad; Apriliyanto, Yusuf Bramastya; Basuki, Rahmat
Indonesian Journal of Chemical Studies Vol. 1 No. 1 (2022): Indones. J. Chem. Stud., June 2022
Publisher : Indonesian Scholar Society

Thiazole derivative molecules with a low energy gap have been successfully designed using the DFT/TD-DFT calculation methods. The calculations were simulated by adding varied numbers of thiophenes (1, 2, 3, and 10) and electron donating molecules of –H, -NH2, -OCH3, and –COOH in the ethanol solvent. The best thiazole derivative was the molecule constructed using a long-conjugated bridge of 10-thiophenes, the carboxyl anchoring site, and an amine addition as the electron donating molecule with an energy gap of 1.66 eV and a strong UV-Vis absorption in the red light region (673.20 nm). These designed molecules are beneficial to be applied in the equator area such as Indonesia. Further, the profound effects of the thiophene bridge in terms of the structural and energy gaps, and the variation of electron-donating molecules affected the photonic properties have been demonstrated in this paper.

Synthesis of Modified TiO₂ Nanocomposite using Fe₃O₄ and Nickel as Photocatalyst in Reduction of Silver Ions Pradipta, Adya Rizky; Irunsah, Aslan
Indonesian Journal of Chemical Studies Vol. 1 No. 1 (2022): Indones. J. Chem. Stud., June 2022
Publisher : Indonesian Scholar Society

The use of TiO2 nanocomposite modified with Fe3O4 dan Ni dopping for silver ion photoreduction has been successfully carried out. In this study, nanocomposites were fabricated through the sol-gel technique. Structure, optical, and magnetic properties were analyzed using XRD, DRUV-Vis, FTIR, and VSM analysis. The XRD pattern revealed the anatase phase of TiO2 and the iron oxide formed was Fe3O4. UV-Vis spectroscopy showed the formation of absorption in the visible region in the presence of Ni doping. The nanocomposite had magnetic properties of 12.6 emu/g with paramagnetic type. TiO2 nanoparticles presented the percentage reduction of Ag ions with UV and Visible light of 82.65% and 21.43%, respectively, while Fe3O4/ TiO2-Ni with UV and Visible light were 80.93% and 90.72%, respectively. Ni-dopped nanocomposites had shown high photocatalytic activity under both UV and Visible irradiation.

Implementation of Thin Layer Chromatography to Detect Dihydroxybenzene Isomers for Cosmetic Product Regulatory Enforcement Hasibuan, Anggi Khairina Hanum; Permatasari, Novita Indah
Indonesian Journal of Chemical Studies Vol. 1 No. 1 (2022): Indones. J. Chem. Stud., June 2022
Publisher : Indonesian Scholar Society

Thin Layer Chromatography (TLC), used in forensic analysis, has many advantages: simple, cheap, and efficient. This study aimed to separate dihydroxybenzene isomers in whitening creams in the market and online shops using the BPOM label or not. Of the six eluent mixtures, this research used Toluene: Diethyl Ether: Acetic Acid with a ratio of 80:20:1 after optimization and validation test. In this case, the recovery percentages of resorcinol and hydroquinone were 51-66% and 80-87%. Of the 20 samples tested, 12 whitening creams were added with resorcinol, and 4 were added with hydroquinone. The addition of resorcinol and hydroquinone based on the regulation in Perka BPOM no 18 of 2015 was 5%. Furthermore, 2 out of 20 samples were added with hydroquinone within the regulated threshold, while the remaining 2% were accepted and the other six were undetected. In this case, adding hazardous substances has violated the rules of consumer protection laws and regulations.

Preparation of Flame Resistant Retanning Product for Glove Leather Zehra, Beena; Solangi, Barkat Ali; Nadeem, Uzma
Indonesian Journal of Chemical Studies Vol. 1 No. 2 (2022): Indones. J. Chem. Stud., December 2022
Publisher : Indonesian Scholar Society

Leather gloves are very light leather used for protection against various risks. A flame-resistant product is needed to increase the flame resistance of natural leather. In this study, 02 flame resistant retanning products had been prepared utilizing waste leather protein extract with phosphoric acid and formaldehyde. These products had been applied at the retanning stage during leather processing. The utilization of phosphorus compounds chemically reacted with or deposited in leather fibers represented the most significant contribution in durable flame retardancy. The final prepared leathers had been characterized for different physical properties such as radiation and electric heat resistance, flame spread resistance and impact of spatter. These products had been found to be compatible with commercial flame-resistant products. The thermal behavior of prepared leathers showed significant resistance.

Effect of Roasting Process on Antioxidant Activity of Carica Seeds Coffee (Carica pubescens) Sukowati, Siski Andini; Arif, Zulhan; Heryanto, Rudi
Indonesian Journal of Chemical Studies Vol. 1 No. 2 (2022): Indones. J. Chem. Stud., December 2022
Publisher : Indonesian Scholar Society

Carica seeds (Carica pubescens), one of the diversification of coffee drinks, served as antioxidants. The roasting process generated degradation of secondary metabolic compounds but produced Maillard reactions products (MRPs). The study aimed to determine the effect of the roasting process on the antioxidant activity of Carica coffee beans and its correlation to the Maillard reaction. The samples roasting temperatures were 100–115, 150–165, and 200–215 °C. The samples were analyzed for proximate, total phenolic, antioxidant, and FTIR. The moisture and ash content of dry seeds were according to SNI 01-2907-2008. The total phenolic content was 3.21–8.99 µgGAE/g, with the highest contents at 200–215 °C. The antioxidant activity was 83–459.67 ppm AEAC. The high phenolic content and antioxidant at 200–215 °C were thought to come from MRPs compounds. The FTIR spectra showed stretching of OH, C=C (aromatic), C=N, C=O, and C-OH (phenol). The spectrum intensity weakened at higher temperatures. However, only the nC–H stretching at 200–215 °C became stronger. The Cluster Ward analysis showed resemblance spectra at roasting temperature levels of 100–115 and 150–165 °C. The roasting process affected the antioxidant activity of Carica coffee beans, thereby increasing the roasting temperature level. This condition resulted in higher levels of antioxidants.

Evaluation of The Biochemical Contents in Guillard f/2 and Walne Growth Medium to Fulfill the Animal-Free Aspects of Microalgal Bioprocessing Stiawan, Elva
Indonesian Journal of Chemical Studies Vol. 1 No. 2 (2022): Indones. J. Chem. Stud., December 2022
Publisher : Indonesian Scholar Society

Marine microalgae with their diverse biomolecule contents could be used as potential sources of food, cosmetics, and pharmaceutical ingredients. In accordance with regulations in some countries and to competitively engage huge numbers of consumers, microalgae-based products should be properly manufactured using non-animal-derived materials. As a cultivable microorganism using a scalable bioreactor technique, consideration of the origin of the material used in the upstream process of marine microalgae was inevitable. Currently, the material origin of chemical contents within common artificial microalgal seawater medium had not been evaluated. This article evaluated Guillard f/2 and Walne medium as common artificial microalgal nutrients used in marine microalgal bioprocess-related activities. The risk assessment results showed that the largest portion of Guillard f/2 and Walne media were inorganic salts considered as low, while the remaining biochemical contents of vitamins were categorized as high risk due to their relatively complex chemical synthesis and enzymatic stages during the manufacturing process. As a suggestion, several plant-based bioproducts were proposed as alternative sources to substitute related biochemical actions to fulfill non-animal-origin aspects in the initial stages of the bioprocessing of marine microalgal-based products.

A Critical Technology Implementation of Sodium Solid-state Battery as the Secure Long-Duration Energy Storage toward the Terra-Watt Grid Projects Kurniadi, Tedi; Fahri, Mirad; Aurellia, Fidela; Nurrosyid, Naufan
Indonesian Journal of Chemical Studies Vol. 1 No. 2 (2022): Indones. J. Chem. Stud., December 2022
Publisher : Indonesian Scholar Society

The current lithium-ion battery (LIB) has become a vital technology for realizing a highly-productive society. The current system can be found easily in every personal electronic device, such as smartphones, laptops, smartwatches, and digital cameras. However, the future of LIBs is questionable due to the scarcity and security issues. The common electrolytes in this system are highly flammable, toxic, and easy to leak. Thus, inherit them to be applied for more mass-reliable energy sources, the terra-watt projects. Therefore, the development of an all-solid-state battery based on earth-abundant and cost-effective processing should be carried out immediately to dominate the market and for future civilization. Herein, we promoted a Sodium solid-state battery (SSB) that potentially be a key in energy storage technology due to its mechanical properties, electrochemical stability, high ion conductivity, and robust cyclic performance. Furthermore, a five-year direct implementation strategy of SSB was also presented, constructed from sodium and chromium electrodes.

Physical Strength Improvement of Nata de Coco by Water Replacement with Carboxymethylcellulose (CMC) as A Potential Bulletproof Material: A Preliminary Study Bolilanga, Patricya Inggrid Wilhelmina; Sekarini, Artanti; Toharani, Dita Cinta; Rahmawati, Fani; Basuki, Rahmat; Ishartono, Bayu; Fahri, Mirad
Indonesian Journal of Chemical Studies Vol. 1 No. 2 (2022): Indones. J. Chem. Stud., December 2022
Publisher : Indonesian Scholar Society

The dependence on the imported bullet-proof vest as one of the main equipments of the National Defense System needs attention. This condition treats the independence of domestic defense security. In contrast, the potential of natural materials for bullet-proof vest plates are abundant in Indonesia. Nata de Coco is one of the natural raw materials for producing bullet-proof vest plates that has the potential to be developed. This preliminary research proved that increasing the bond strength of cellulose in Nata de Coco was performed by adding the appropriate crosslinkers. The addition of carboxymethylcellulose (CMC) 2% crosslinker to form Nata de Coco kevlar-like plates (Navlar) was evidenced to increase threefold tensile strength (99.15 MPa) from its original Nata de Coco (31.92 MPa). The development of Navlar is a very strategic sector for producing high-quality bullet-proof vest plates equivalent to kevlar strength. Navlar is more prospective than Kevlar due to its abundant source, cheap, lightweight, and ease to manufacture. Developing Navlar could replace the dependence on imported Kevlar and support the domestic defense industry.

Page 1 of 3 | Total Record : 27

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Rahmat Basuki

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Desa Sibrama RT 001 RW 004 , Desa/Kelurahan Sibrama, Kec. Kemranjen, Kab. Banyumas, Provinsi Jawa Tengah

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Jawa tengah

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Rahmat Basuki

Contact Email rhmtbsq@gmail.com

Phone +6285743213964

Journal Mail Official indonesjchemstud@gmail.com

Editorial Address Desa Sibrama RT 001 RW 004 , Desa/Kelurahan Sibrama, Kec. Kemranjen, Kab. Banyumas, Provinsi Jawa Tengah

Location Kab. banyumas, Jawa tengah INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Rahmat Basuki

Contact Email
rhmtbsq@gmail.com

Phone
+6285743213964

Journal Mail Official
indonesjchemstud@gmail.com

Editorial Address
Desa Sibrama RT 001 RW 004 , Desa/Kelurahan Sibrama, Kec. Kemranjen, Kab. Banyumas, Provinsi Jawa Tengah

Location
Kab. banyumas,

Jawa tengah

INDONESIA