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Dina Kartika Maharani
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Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231
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Unesa Journal of Chemistry
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Published by Universitas Negeri Surabaya
ISSN : -     EISSN : 22528180     DOI : https://doi.org/10.26740/ujc.v11n2
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
UNESA Journal of Chemistry is online Journal covering all aspects of Chemistry. The journal publishes original research paper and review articles.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 93 Documents
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Sintesis Nanopartikel Au-SiO2 Menggunakan Natrium Silikat dari Abu Ampas Tebu (AAT) Nur Aini; Amaria Amaria
Unesa Journal of Chemistry Vol 11 No 3 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (731.966 KB) | DOI: 10.26740/ujc.v11n3.p143-152

Abstract

Synthesis of Au-SiO2 has been carried out using sodium silicate solution from bagasse ash (AAT) as the main source of silica. The purpose of this study was to determine the mole ratio of Au:Si in the relatively stable Au-SiO2 nanoparticles, which could be observed from the maximum wavelength and the determination of full width half maximum (FWHM). This type of research is experimental research. This research went through stages, namely synthesis of sodium silicate from bagasse ash, synthesis of Au-SiO2 and their characterization. The parameters studied were variations in the Au:Si mole ratio (1:19, 1:39 and 1:76), identifying the functional group Au-SiO2, determining the maximum wavelength and determining the stability of Au-SiO2. The identification of the Au-SiO2 was carried out using the FTIR instrument and the maximum wavelength was determined using a UV-VIS spectrophotometer. The results obtained are clear liquid Au-SiO2, dark red at a ratio of 1:19, pink at a ratio of 1:38 and 1:76. The results of identification with FTIR showed that the Au-SiO2 nanoparticles contained N-H and C-H groups at wave numbers 1566,77 cm-1 and 2923.02 cm-1, siloxane (Si-O-Si) and silanol (Si-OH) groups at wave numbers 1027.24 cm-1 and 902,12 cm-1. The results of measurements with a UV-VIS spectrophotometer show that Au-SiO2 nanoparticles are relatively stable at a ratio of 1:76 with a maximum absorption wavelength in the range of 523-523.5 nm, it can be said that silica was able to maintain the stability of Au nanoparticles in storage for 8 days. Key words: nanoparticle Au, silica, bagasse
Determination of Optimum Programmed Temperature for Fatty Acid Analysis of Chlorella Microalgae Extract Using GCMS Instrument surani surani; Cahyo Pujiasmoro; Asep Kadarohman
Unesa Journal of Chemistry Vol 12 No 1 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (256.814 KB) | DOI: 10.26740/ujc.v12n1.p20-25

Abstract

Gas Chromatography-Mass Spectrometry (GCMS) column temperature is one of the variables that must be considered in the analysis of chemical compounds, so that the compounds are appropriately separated. This study aims to determine the optimum programmed temperature for fatty acid analysis using the GCMS instrument. The fatty acid samples used were derived from the extract of Chlorella microalgae. Chlorella microalgae extraction was done by sonication for 60 minutes using hexane as solvent. The GCMS programmed temperature variations were carried out, namely the temperature increase was 5 OC /minute, 7 OC/minute, 9 OC/minute, 12 OC/minute with an initial temperature of 80 OC and a final temperature of 270 OC. The number of samples injected was 0.2 mL. The data from the analysis is processed by comparing the retention time and analysis time. It was found that the optimum condition for the programmed temperature measurement was the initial temperature of 80 oC and an increase of 9 OC/minute to a temperature of 270 OC with an analysis time of 21.1 minutes. The fatty acids in Chlorella microalgae extract are palmitic acid, oleic acid and stearic acid. By using this measurement method, the analysis time is shortened and the expected compounds can be identified properly Keywords: Analysis, GCMS, programmed temperature, fatty acids, Chlorella microalgae
Karakterisasi Abu Sekam Padi dengan Menggunakan XRD samik samik; Nita Kusumawati; Maria Monica Sianita; Dina Kartika Maharani; Amalia Putri Purnamasari; Mukhlash Imaduddin; M Iqbal Al Ghifari
Unesa Journal of Chemistry Vol 11 No 3 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (781.735 KB) | DOI: 10.26740/ujc.v11n3.p153-159

Abstract

Rice husk ash is a material that mostly contains silica (SiO2). Silica can be used as a raw material for various industries. This research is an experimental study, covering the synthesis of rice husk ash with various calcination temperatures, namely 800 oC, 900 oC, and 1000 oC. The purpose of this study was to identify the type of solid and crystalline phases of RHA so that the results of this study could be used as a basis for further research on the use of RHA. The results of the synthesis produced four types of samples, namely samples calcined at a temperature of 800 oC (coded S-800), calcined at 900 oC was gray (S-900 A), calcined at 900 oC was white (S-900 P), and samples were calcined at a temperature of 1000 oC (S-1000). Characterization using X-Ray Diffraction (XRD) showed that all samples included crystalline solids with the tridymite crystal phase and cristobalite were detected in samples S-800, S-900 P, S-900 A, and S-1000. Cristobalite and tridymite are silica mineral polymorphs with the same chemical formula as quartz, SiO2, but have different crystal structures. The percentage of crystallinity of the sample was calculated by comparing the sample which has the highest peak intensity (S-1000). The crystallinity results for S-1000, S-900 P, and S-900 A were 100%, 96%, 79%, and 32%. The lower the calcination temperature, the smaller the percentage of crystallinity. Keywords: rice husk ash, calcined, silica, XRD, crystalline solid
PEMBUATAN ZEOLIT TERMODIFIKASI HEKSADESILTRIMETILAMONIUM (HDTMA) UNTUK APLIKASI PUPUK N SLOW RELEASE Tidora Juliana Worisio; Dina Kartika Maharani
Unesa Journal of Chemistry Vol 12 No 1 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (297.704 KB) | DOI: 10.26740/ujc.v12n1.p31-35

Abstract

This study aims to determine the release of nitrogen levels in fertilizer samples by varying the ratio of zeolite volume to cationic surfactant mass and knowing the chemical characterization of FTIR. In this study natural zeolite and hexadecyltrimethylammonium (HDTMA) were used as the main ingredients. Fertilizer production in this study by activating natural zeolite using 1M HCl then added surfactant HDTMA 0.05M with a ratio of 1: 1, 1: 3, 1: 5, then added a 0.05M NaNO3 solution as a nitrogen source which then tested slow release on land for 7 days. The results of the chemical characterization of FTIR showed a band shift in activated zeolite, HDTMA modified zeolite (1: 1), and ZMS (I). The release of nitrogen levels on day 0 of ZMS (I) was smaller than 0,00059% but on day 7 the nitrogen release was smaller in zeolite activated by 1.3339% compared to ZMS (I) which on day 7 was 1.625% .
POTENSI SENYAWA EUGENOL DARI CENGKEH (Syzygium aromaticum) SEBAGAI INHIBITOR PROTEASE HIV-1 (PR) Ahmad Misbakhus Sururi; Dina Kartika Maharani; First Ambar Wati
Unesa Journal of Chemistry Vol 12 No 1 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (273.624 KB) | DOI: 10.26740/ujc.v12n1.p26-30

Abstract

Syzygium aromaticum is a medicinal plant that is well known for its uses in the medical world. This plant contains essential oil that has a lot of bioactivitis, namely eugenol. This study aims to determine the potency of the compound eugenol and its derivatives as an inhibitor of HIV-1 protease (PR), an HIV-1 antiviral candidate. The ligands used in this study were eugenol, methyl eugenol, acetyl eugenol, and isoeugenol. The results showed that the compound acetyl eugenol has the potential to act as an HIV-1 protease inhibitor better than other eugenol derivatives because it has a lower binding affinity value (-6.2 kcal/mol) of the other compounds. Further studies such as in vitro and in vivo tests are needed to prove its activity as an HIV-1 protease.
PEMANFAATAN ZEOLIT ALAM AKTIF SEBAGAI ADSORBEN BIOETANOL AMPAS TEBU Alsari, Nabila Estiani; Amaria, Amaria
Unesa Journal of Chemistry Vol. 12 No. 2 (2023): Vol 12 No 2 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v12n2.p49-56

Abstract

The fossil energy crisis due to the high use of fuel oil is an important factor in efforts to develop alternative energy sources from natural raw materials, namely bioethanol. Bioethanol is made from raw materials such as starch, sugar or cellulose which produces low ethanol content, so it needs to be increased through a dehydration process with activated natural zeolite. This study aims to determine the content of bagasse bioethanol and the optimal time of water adsorption in bioethanol using active natural zeolite. In this study natural zeolite was activated chemically and physically using 2% H2SO4 for 3 hours and calcined at 600?C for 6 hours. Variation in adsorption time of bioethanol with zeolite was 1, 3, 5 and 7 hours with three repetitions. Sugarcane bagasse bioethanol is produced through hydrolysis, followed by yeast fermentation, distillation and adsorption with active natural zeolite, then the ethanol content is measured with an alcohol refractometer. The results obtained were that the ethanol content of bagasse before being adsorbed was 42% and after being adsorbed with zeolite at variations of soaking time of 1, 3, 5 and 7 hours respectively 43%; 44%; 47%; and 45%.
REVIEW ARTIKEL : PRODUKSI BIODIESEL DARI MINYAK GORENG BEKAS DENGAN METODE TRANSESTERIFIKASI MENGGUNAKAN KATALIS Budiman, Aditya Arif; samik, samik
Unesa Journal of Chemistry Vol. 12 No. 2 (2023): Vol 12 No 2 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v12n2.p36-48

Abstract

Waste frying oils are renewable energy raw materials that can be used to produce biodiesel at more economical production costs because they are waste and are cheap or even free. The use of WFO as a biodiesel raw material is an environmentally friendly measure as it can reduce environmental pollution, especially in soil and rivers. Therefore, the purpose of this article is to explain the processing of WFO into biodiesel raw materials with a variety of catalysts, including acid, base, and enzyme catalysts that are both homogeneous and heterogeneous. The method used in writing this article is to review various articles on the production of biodiesel with the transesterification method using catalysts that are acidic (homogenic and heterogenic), bases (homogenic and heterogenic), and enzyme catalysts. Results from various studies suggest that WFO can be converted into biodiesel using a variety of catalysts. Under optimal conditions, homogeneous acid catalysts such as H2SO4 produce yield biodiesel at 95.37%. Heterogeneous acid catalysts such as Fe2O3-MnO-SO42- / ZrO2 produce a yield of 96,5%. Homogeneous base catalysts such as NaOH produce a biodiesel yield of 98%. Heterogeneous base catalysts such as CaO-MgO produce biodiesel yields of 98,95%. Enzyme catalysts such as Lipase enzyme from Candida rugosa and Rhizomucor miehei produce biodiesel yields of 96,5%. From these results, the heterogeneous base catalyst CaO-MgO is the catalyst with the highest yield in producing biodiesel among various other catalysts
A STUDI IN SILICO: POTENSI SENYAWA KATEKIN DAN TURUNANNYA DARI TEH HIJAU SEBAGAI INHIBITOR HGF SERTA PROFIL TOKSISITASNYA Sururi, Ahmad Misbakhus; Wati, First Ambar; Maharani, Dina Kartika
Unesa Journal of Chemistry Vol. 12 No. 2 (2023): Vol 12 No 2 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v12n2.p57-63

Abstract

Green tea is a plant with a high content of catechins. Catechins are a secondary metabolites that possess many benefits and potencies, one of which is as an antitumor. This study aims to describe the potential of catechin and its derivatives as antitumor inhibitor of HGF and their toxicity profiles through in silico analysis. The ligands used in this study were catechin, gallocatechin, epicatechin, and epigallocatechin. The results showed that epicatechin has better potency (-6.6 kcal/mol) than other catechin derivatives. The toxicity characteristics of the four catechins indicate that they do not exhibit hepatotoxicity, mutagenicity, or carcinogenicity, and possess a safe LD50 value. Further studies, such as in vitro and in vivo, must reveal its potential as an antitumor HGF inhibitor.
PENGARUH PENAMBAHAN KITOSAN PADA SILIKA ABU SEKAM PADI SEBAGAI ADSORBEN KITOSAN-SILIKA UNTUK MENURUNKAN ION Pb(II) Prehatini, Hesti Sri; Amaria, Amaria
Unesa Journal of Chemistry Vol. 12 No. 2 (2023): Vol 12 No 2 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v12n2.p64-72

Abstract

Identifikasi dan Prediksi Lokasi dan Pencitraan Bensin Segar Menggunakan Kromatogram Senyawa Bertarget Baru dengan Kemometri dan Pembelajaran Mesin Shadan, Aidil Fahmi; Juahir, Hafizan
Unesa Journal of Chemistry Vol. 12 No. 2 (2023): Vol 12 No 2 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v12n2.p73-82

Abstract

Deteksi dan penggunaan bensin di tempat kejadian criminal seperti pembakaran sangat diminati dalam penyelidikan forensik. Dalam karya ini, kromatografi gas-spektrometri massa (GC-MS) digunakan untuk menganalisis sampel bensin dan kemometrik yaitu analisis komponen utama (PCA), analisis diskriminan (DA), dan pembelajaran mesin klasifikasi dan pohon regresi (CART) diterapkan pada mengidentifikasi dan membedakan merek bensin dan lokasi asal. Studi ini mencakup tiga merek bensin populer yang dikumpulkan dari stasiun di delapan negara bagian Malaysia yang berbeda, termasuk satu kilang minyak. Hasil PCA dari 73,6% variasi komponen utama pertama dan kedua untuk kromatogram senyawa target baru (TCC) dan DA menggunakan metode analisis diskriminan dengan benar mengklasifikasikan 94,3% sampel pelatihan untuk lokasi asal dan 71,7% sampel pelatihan untuk merek. Model pembelajaran mesin two-C&R-trees (CART) baru juga dikembangkan dan diterapkan secara efektif pada 100 sampel bensin yang tidak dikenal, dengan rata-rata kesalahan absolut sebesar 1,1% (lokasi) dan 0,4% (merek). Hasil yang diperoleh menunjukkan potensi metodologi ini untuk membantu menyelesaikan investigasi kriminal.

Page 7 of 10 | Total Record : 93

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