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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 5 Documents
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Search results for , issue "Vol. 12 No. 2 (2023): Vol 12 No 2 (2023)" : 5 Documents clear
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.

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