Article Per Year (5 Year)
p-Index From 2020 - 2025
0.778
P-Index
This Author published in this journals
All Journal GRADIEN Jurnal Kimia Riset Science and Technology Indonesia Rafflesia Journal of Natural and Applied Sciences (RJNAS)
Irfan Gustian
Department of Chemistry-Faculty of Mathematics and Natural Sciences, Universitas Bengkulu
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health

Published : 8 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 8 Documents
Search

 1 
Efek Perendaman Larutan Alkali Terhadap Prilaku Film Kertas Dari Nata de coco Yang Dimodifikasi Gustian, Irfan; Sutanto, Teja Dwi; Adfa, Morina
GRADIEN : Jurnal Ilmiah MIPA Vol 2, No 1 (2006): (Januari 2006)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (254.114 KB)

Abstract

Telah dibuat film kertas dari nata de coco yang di modifikasi dengan memanfaatkan air kelapa sebagai bahandasar yang difermentasi. Penelitian ini bertujuan untuk membuat selulosa bakteri dari air kelapa dengan bantuan bakteri Acetobacter xylinum, memodifikasi selulosa bakteri yang dihasilkan menjadi lembaran kertas, menguji sifat fisik serta melihat morphologi kertas yang dihasilkan. Gel nata de coco yang dihasilkan dilakukan dua variasi perlakuan. Variasi yang pertama direndam dalam larutan NaOH 2% pada temperatur 80 – 90 oC selama 2 jam. Variasi yang kedua hasil dari peralakuan pertama direndam lagi dalam larutan NaOH 5% pada temperatur 80 – 90 oC selama 2 jam. Masing-masing variasi di hot press pada tekanan 100 Kgf/cm2 pada suhu 120 oC selama 3 - 5 menit. Hasil pengujian di dapat kerapatan kertas variasi 1 berkisar antara 1,0570 – 1,3330 g/cm2 dan lebih besar dibandingkan dengan kertas variasi 2 yaitu berkisar antara 0,7813 – 1,1666 g/cm2. Sifat penggembungan kertas atau derajat swelling kertas oleh air, variasi 1 memiliki derajat swellingberkisar antara 61,1842 – 91,2162% lebih kecil dibandingkan dengan derajat swelling kertas nata de coco variasi 2 berkisar 77,1428 – 109,4595%. Hasil SEM terlihat permukaan cukup rapat dengan serat yang panjang dengan arah yang tidak beraturan.   
Studi penurunan salinitas air dengan menggunakan Zeolit alam yang berasal dari bengkulu Gustian, Irfan; Suharto, Totok E.
GRADIEN : Jurnal Ilmiah MIPA Vol 1, No 1 (2005): (Januari 2005)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (164.685 KB)

Abstract

Penelitian ini telah dilakukan untuk memodifikasi zeolit alam menjadi bahan adsorben atau penukar kation alternatif untuk menurunkan kadar garam dalam air. Untuk mengaktifkan zeolit, sampel serbuk zeolit alam dimodofikasi dengan cara penukaran kation dengan larutan ammonium nitrat dan diikuti dengan kalsinasi dalam oven pada suhu 450oC – 550 oC selama 4 jam. Variabel dalam proses aktivasi zeolit alam meliputi ukuran partikel, konsentrasi larutan ammonium nitrat dan suhu kalsinasi. Hasil penelitian menunjukkan bahwa serbuk zeolit alam yang telah diaktifkan dapat menurunkan kadar garam NaCl sampai 80%. Zeolit alam yang tidak direndam dalam larutan ammonium nitrat dan hanya dikalsinasi juga dapat menurunkan kadar garam, tetapi hanya mencapai 30%. Salinitas air dapat semakin berkurang, jika zeolit yang digunakan telah diaktifkan dengan larutan ammonium nitart berkonsentrasi minimal 2 M, telah dikalsinasi pada suhu 500OC selama 4 jam dengan ukuranpartikel 180 – 250 mikron.
Karakterisiasi Kinerja Dari Beberapa Membran Datar Gustian, Irfan
GRADIEN : Jurnal Ilmiah MIPA Vol 2, No 2 (2006): (Juli 2006)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (56.479 KB)

Abstract

Penelitian ini bertujuan untuk membuat membran datar melalui beberapa cara. Cara pertama menggunakancara tekan panas dengan bahan dasar selulosa bakteri untuk proses osmosis balik dan proses ultrafiltrasi dan yangkedua menggunakan cara inversi phasa dengan polisulfon sebagai lapisan pendukung, selulosa asetat, aseton danformamida sebagai lapisan aktif. Pengujian yang telah dilakukan adalah terhadap koefisien rejeksi dan fluks darimembran yang dihasilkan. Dari hasil menunjukkan bahwa keofisien rejeksi untuk cara pertama pada proses osmosisbalik adalah 55% hingga 78% dan untuk proses ultrafiltrasi adalah 98%. Pada cara kedua menggunakan inversi phasadiperoleh 66,94% hingga 72,93%.Kata kunci: membran datar; koefisien   
Pembuatan dan Karakterisasi Katalis Bifungsional dari Zeolit Alam Suharto, Totok Eka; Gustian, Irfan; Sudaryono, Agus
GRADIEN : Jurnal Ilmiah MIPA Vol 3, No 2 (2007): (Juli 2007)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (624.422 KB)

Abstract

Bifunctional zeolite catalysts have been prepared by three following steps: activation of local natural zeoliteby hydrochloric acid and ammonium nitrate solutions, followed by impregnation of Cr, Ni, and Ti ions separately, and finally by calcination at 500oC for 4 hours. Characterization of catalyst properties was conducted by XRD to analyze its crystal phases, by SEM to study its surface morphology, by methylene blue to determine its surface area, and by IR spectroscopic and adsorbed ammonia gravimetric methods to analyze acidic properties. X-ray difractograms show that all calcined catalysts have amorphous and dominant crystalline phases. The morphology of catalysts analyzed by SEM prohibited similar cracked lamellar layers on the surface characterized by a microporous material. These catalysts have high specific surface area of 110 m2/g. Acid amount measured by adsorbed ammonia gravimetric method is in a range of 3.00 – 3.70 mg NH3/g.   
THE EFFECT OF COPAL RESIN AND TURPENTINE OIL AS TACKIFIER ON THE ADHESIVES QUALITY BASED OF LIQUID RUBBER COMPOUND Widayanti, Tri; Sutanto, Teja Dwi; Gustian, Irfan
Jurnal Kimia Riset Vol. 9 No. 2 (2024): December
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v9i2.65365

Abstract

This research aims to develop adhesives from liquid rubber compounds with a variety of tackifiers, a combination of copal resin, and turpentine oil. It also aims to characterize the adhesives to determine the quality of the adhesives produced. The research comprised several stages, including the preparation of rubber additive dispersions and solutions, formulation of liquid rubber compounds and adhesives, fabrication of test pieces, and subsequent characterization. The liquid rubber compound is made by mixing concentrated latex with rubber additives, which include KOH as a stabilizer, stearic acid and ZnO as an activator, BHT as an antioxidant, CaCO3 as a filler, MBTS and TMTD as an accelerator, and sulfur as a vulcanizer. The adhesives are made by mixing liquid rubber compound with tackifier material with various combinations of copal resin/turpentine oil, namely F1 (0 gram/4 gram); F2 (1 gram/3 grams); F3 (2 grams/2 grams), F4 (3 grams/1 gram), and F5 (4 grams/0 grams). Adhesives characterization was carried out by testing pH, viscosity, adhesives strength, FTIR, XRD, and thermal analysis. The research results showed that the best conditions were obtained on F4 adhesives with an adhesives strength value of 1.7452 N/mm, viscosity of 1100 cP, and pH 4.6. In this condition, the resulting adhesives meet the requirements for adhesives in accordance with SNI 06-6049-1999 and SNI 12-7195-2006.
Uji Antirayap ekstrak metanol daun ruku-ruku (Ocimum tenuiflorum) terhadap rayap tanah Coptotermes curvignathus Khairani, Nurliza; Avidlyandi, Avidlyandi; wiradimafan, khafit; Juliari Kusnanda, Arif; gustian, Irfan; adfa, Morina
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 4 No. 2 (2024): Oktober
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v4i2.39453

Abstract

Penelitian ini bertujuan untuk menentukan aktivitas anti termitisida ekstrak metanol daun ruku-ruku (Ocimum tenuiflorum) terhadap rayap Coptotermes curvignathus Holmgren menggunakan metode no- choice test dan penentuan komponen kimia menggunakan GC-MS. Hasil uji aktivitas termitisida diperoleh persentase tase kematian rayap meningkat seiring dengan naiknya konsentrasi yang diberikan, konsentrasi 20% menyebabkan kematian rayap mencapai 100% pada hari ke-7. Hasil GC-MS menunjukkan terdapat 70 komponen kimia pada ekstrak metanol daun ruku-ruku dimana terdapat 3 senyawa utama, 53 senyawa minor serta 14 senyawa yang belum terdeteksi, dengan senyawa utamanya adalah methyl palmitate, methyl linolenate dan 14-methyl pentadecanoic acid methyl ester.
Synthesis and Characterization of Composite Materials Based on Bacterial Cellulose and Fly Ash Yuliah, Maya; Sutanto, Teja Dwi; Maryanti, Evi; Angasa, Eka; Gustian, Irfan
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.2.552-561

Abstract

The synthesis of composite materials based on bacterial cellulose with fly ash (FA) has been carried out based on the mass ratio between bacterial cellulose and fly ash, namely 0.005:4.995; 0.01:4.99; 0.015:4.985, and 0.02:4.98. Bacterial cellulose was obtained from the fermentation of coconut water and fly ash was treated after being obtained from the Steam Power Plant (PLTU) of Bengkulu Electric Power Plant Pulau Baai. The characterization of the composite material that had been formed was analyzed using Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Raman Spectroscopy, and Scanning Electron Microscope (SEM), the results can be validated that the bacterial cellulose composite has been formed with fly ash. The FTIR results also support the XRD results that have been obtained, Raman spectroscopy shows a Raman shift at 1352 cm-1 as an indication of the bending of C-C-H, CH2, and C-OH the highest conductivity was obtained in the variation of 0.02:4.98 which is 2.45×10-3 S/cm. The methanol permeability test obtained was higher along with the addition of fly ash to bacterial cellulose occurred in the composite material variation of 0.02:4.98, which is 3.66×10-9 mol/cm.s. The highest water absorption occurred in the composite material variation of 0.01:4.98 reaching 718% and the results of SEM micrographs with a magnification of 10000× produced a morphology in the form of fibers with fly ash components interwoven by bacterial cellulose fibers.
UJI AKTIVITAS ANTIBAKTERI EKSTRAK ETANOL KULIT BUAH KABAU (Archidendron bubalinum) TERHADAP Staphylococcus aureus Oktiarni, Dwita; Gaol, Amelia Debora Lumban; Avidlyandi; Gustian, Irfan; Putranto, Agus Martono Hadi
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 5 No. 1 (2025): April
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v5i1.42784

Abstract

The kabau plant (Archidendron bubalinum) is an endemic plant of Indonesia, especially on the island of Sumatra, with secondary metabolite content in the form of flavonoids, tannins, saponins and steroids which have antimicrobial activity. This study aims to determine the antibacterial activity of ethanol extract of kabau fruit peels (Archidendron bubalinum) against Staphylococcus aureus and to determine the optimum percentage of extract in inhibiting Staphylococcus aureus with percentages 1%, 2.5%, 5% and 10%. The antibacterial activity of kabau fruit peels extract was tested by the well diffusion method using Nutrient Agar (NA) media. The results showed that ethanol extract of kabau fruit peels with a percentage of 10% was the optimum percentage in inhibiting the growth of Staphylococcus aureus with an inhibition zone diameter of 10.59 mm. From the data, it can be concluded that the extract of kabau fruit peels has the potential as an antibacterial against Staphylococcus aureus with a sensitive inhibitory category.
Co-Authors Agus Martono Hadi Putranto Agus Sudaryono Avidlyandi, Avidlyandi Dwita Oktiarni Eka Angasa Evi Maryanti Gaol, Amelia Debora Lumban Juliari Kusnanda, Arif Khafit Wiradimafan Khairani, Nurliza Morina Adfa Teja Dwi Sutanto Totok E. Suharto Totok Eka Suharto Tri Widayanti Yuliah, Maya