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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Kimia dan Kemasan Indonesian Journal of Chemistry Jurnal Kartika Kimia Jurnal Kimia dan Kemasan Helium: Journal of Science and Applied Chemistry Journal Serambi Engineering (JSE) Scientific Contributions Oil and Gas
Handajaya Rusli, Handajaya
Division Of Analytical Chemistry, Faculty Of Mathematics And Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung 40132, Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Pembuatan dan Karakterisasi Membran Polimetilmetakrilat (PMMA) – Bentonit untuk Memisahkan Maltosa dan Pati Abdullah, Karim; Rusli, Handajaya
Jurnal Kimia dan Kemasan Vol. 37 No. 2 Oktober 2015
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (819.288 KB) | DOI: 10.24817/jkk.v37i2.1816

Abstract

Maltosa adalah salah satu senyawa turunan pati yang banyak digunakan sebagai pemanis untuk menggantikan sukrosa. Hidrolisis pati untuk menghasilkan maltosa dapat dilakukan dengan menggunakan reaktor kontinu yang menggunakan membran untuk memisahkan pati dan maltosa yang telah terbentuk. Pada penelitian ini, telah berhasil dibuat membran PMMA-Bentonit dengan kadar PMMA 14% (m/m) dalam pelarut N,N-dimetilformamida, dan  perbandingan massa antara PMMA: bentonit adalah 3:1. Membran yang dihasilkan mampu memisahkan pati dengan persen rejeksi bervariasi antara 40 – 70 % dan melewatkan maltosa dengan persen rejeksi kurang  dari 5%. Proses pemisahan terjadi karena adanya pori pada membran. Hal ini didukung oleh foto SEM penampang melintang membran.
Pembuatan dan Karakterisasi Membran Polimetilmetakrilat (PMMA) – Bentonit untuk Memisahkan Maltosa dan Pati Karim Abdullah; Handajaya Rusli
Jurnal Kimia dan Kemasan Vol. 37 No. 2 Oktober 2015
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24817/jkk.v37i2.1816

Abstract

Maltosa adalah salah satu senyawa turunan pati yang banyak digunakan sebagai pemanis untuk menggantikan sukrosa. Hidrolisis pati untuk menghasilkan maltosa dapat dilakukan dengan menggunakan reaktor kontinu yang menggunakan membran untuk memisahkan pati dan maltosa yang telah terbentuk. Pada penelitian ini, telah berhasil dibuat membran PMMA-Bentonit dengan kadar PMMA 14% (m/m) dalam pelarut N,N-dimetilformamida, dan  perbandingan massa antara PMMA: bentonit adalah 3:1. Membran yang dihasilkan mampu memisahkan pati dengan persen rejeksi bervariasi antara 40 – 70 % dan melewatkan maltosa dengan persen rejeksi kurang  dari 5%. Proses pemisahan terjadi karena adanya pori pada membran. Hal ini didukung oleh foto SEM penampang melintang membran.
Pembuatan dan Karakterisasi Membran Polimetilmetakrilat (PMMA) – Bentonit untuk Memisahkan Maltosa dan Pati Karim Abdullah; Handajaya Rusli
Jurnal Kimia dan Kemasan Vol. 37 No. 2 Oktober 2015
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (819.288 KB) | DOI: 10.24817/jkk.v37i2.1816

Abstract

Maltosa adalah salah satu senyawa turunan pati yang banyak digunakan sebagai pemanis untuk menggantikan sukrosa. Hidrolisis pati untuk menghasilkan maltosa dapat dilakukan dengan menggunakan reaktor kontinu yang menggunakan membran untuk memisahkan pati dan maltosa yang telah terbentuk. Pada penelitian ini, telah berhasil dibuat membran PMMA-Bentonit dengan kadar PMMA 14% (m/m) dalam pelarut N,N-dimetilformamida, dan  perbandingan massa antara PMMA: bentonit adalah 3:1. Membran yang dihasilkan mampu memisahkan pati dengan persen rejeksi bervariasi antara 40 – 70 % dan melewatkan maltosa dengan persen rejeksi kurang  dari 5%. Proses pemisahan terjadi karena adanya pori pada membran. Hal ini didukung oleh foto SEM penampang melintang membran.
Removal of Heavy Metal Ions Using Pristine and Functionalized Natural Zeolites Khoirul Ihsan Solihin; St Mardiana; Handajaya Rusli; Grandprix Thomryes Marth Kadja
Indonesian Journal of Chemistry Vol 23, No 3 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.81098

Abstract

Heavy metal ions have attracted significant concern regarding their toxicity in living organisms. Concurrently, the removal of heavy metals by the adsorption method is also under the spotlight because it is effective, less cost-demanding, and easy to operate. To date, natural zeolites become one of the most used adsorbents for it is low cost, abundant in reserve, and has high selectivity towards heavy metal. Zeolites possess negatively charged three-dimensional frameworks built by SiO4 and AlO4 tetrahedra, which are balanced by counter-cations. The cations within zeolite frameworks can be exchanged with the heavy metal cations in an aqueous environment. This review comprehensively reports the adsorption capacity of heavy metal ions using pristine and modified natural zeolite. The important aspects, including the physicochemical properties of pristine and modified natural zeolites, heavy metal ion adsorption isotherms, kinetics, and thermodynamics, are discussed in detail. It is imperative to note that the physicochemical properties of natural zeolites greatly determine the adsorption capability. Furthermore, natural zeolites could be modified with various molecules such as surfactants and polymers to improve the adsorption capacity and adsorb heavy metal anions. Ultimately, this review is concluded with prospects for future improvement.
Biodiesel Production from Sudanese Jatropha curcas Seed by The Alkali-Catalyzed Transesterification Process and Its Analysis by Gas Chromatography Arij Mahmoud Ahmed Abdalla; Handajaya Rusli; Muhammad Bachri Amran
Helium: Journal of Science and Applied Chemistry Vol 2, No 2 (2022): Helium: Journal of Science and Applied Chemistry
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/helium.v2i2.6338

Abstract

Sudan is highly dependent on diesel. Diesel is used in agriculture machines, transportation, and other applications. This study has been carried out to produced biodiesel from Jatropha curcas seed oil. Jatropha was chosen because it is not edible, therefore it will not pose a new problem to humans regarding food competition. This research successfully extracted oil from Jatropha curcas seed using n-hexane solvent with yield 39%. The oil than converted to biodiesel by alkaline transesterification process with a conversion yield 92 %. The properties such as flash point, acid value, viscosity, iodine value, density, copper corrosion, cetane number, sulphated ash, pour point, free glycerol, and total glycerol contents were 174 oC, 0.17 mg KOH/g, 8.912 mm2/s, 102 g I2/100 g, 895.8 kg/m3, class1, 51, 0.0047 %, -3 oC, 0.01 %,0.03 %, respectively. These quantities obtained were met most of the biodiesel standards that are ASTM D6751, EN14214, and ASTM D975. The GC data showed the fatty acid methyl ester (FAME) has a 12-20 carbon chain and still has monoglycerides, diglycerides, and triglycerides.
Synthesis of Ethylenediamine Modified Chitosan Beads for Biodiesel Production Catalyst: A Preliminary Study Indah Permata Cantika; Muhammad Ali Zulfikar; Handajaya Rusli
Jurnal Kimia Sains dan Aplikasi Vol 26, No 6 (2023): Volume 26 Issue 6 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.6.230-237

Abstract

Biodiesel is an alternative fuel that can be easily produced through transesterification with the assistance of a catalyst. Palm oil is a widely utilized feedstock for biodiesel production due to its abundant availability. In this study, a catalyst was synthesized using chitosan (CS) modified with ethylenediamine (EDA) and cross-linked with epichlorohydrin (ECH) for a catalyst heterogeneous in transesterification reaction. The resulting product (CS/EDA/ECH) was characterized using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Its performance was evaluated for biodiesel production. The CS/ECH/EDA catalyst achieved optimal reaction conditions with 5% EDA concentration at room temperature, an oil: methanol ratio of 1:1 (v/v), a total volume of 10 mL of oil and methanol, and a catalyst mass of 0.75 grams. The methyl esters formed corresponded to the fatty acid content in palm kernel, namely methyl palmitate, methyl 9,10-octadecadienoate, methyl oleate, methyl 12,13-tetradecadienoate, and methyl stearate with the highest methyl ester conversion is methyl oleate. The CS/ECH/EDA catalyst exhibited consistent performance after three use cycles.
Komposisi Proksimat dari Gracilia Sp, Sargassum Sp, dan Ulva Lactuca di Pantai Sayang Heulang, Garut Selatan, Jawa Barat, Indonesia Rusli, Handajaya; Lestari, Sri Dewi; Iqbal, Muhammad; Rusnadi, Rusnadi
Jurnal Kartika Kimia Vol 6 No 2 (2023): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v6i2.229

Abstract

Carbohydrate protein, fat, and minerals are the main ingredients of seaweed besides water. These main contents can vary depending on environmental conditions and the type of seaweed. Gracilaria sp, Sargassum sp, and Ulva lactuca grow widely and have been used on Sayang Heulang beach, South Garut, West Java, Indonesia. Unfortunately, no information was found for its main content that can indicate the seaweed quality. This research aims to conduct a proximate analysis of the three seaweeds, representing brown seaweed, red seaweed, and green seaweed, respectively. Carbohydrate total analysis was done using Luff Schoorl method and gave 11.2 %w/w, 25.3 %w/w, and 20.4 %w/w for Gracilaria sp, Sargassum sp, and U. lactuca, respectively. Determination of total protein using the Kjeldahl-Nessler method gives 6.5 %w/w for Gracilaria sp, 7.8 %w/w for Sargassum sp, and 8.7 %w/w for U. lactuca. The methods for fat analysis are Soxhlet extraction, which gives 0.3 %w/w for Gracilaria sp, 1.6 %w/w for Sargassum sp, and 1.1 %w/w for U.lactuca. The study also showed Gracilaria sp, Sargassum sp, and U. lactuca contain 26.9 %w/w, 23.6 %w/w, and 32.5 %w/w mineral content, respectively. These results indicate that different types of seaweed provide different chemical compositions.
Preparation of Silica-Phenyl Modified Methacrylate Polymer as Column Particles for Separation of Paracetamol and Caffeine Annisa Mutiara Fitri; Handajaya Rusli; Muhamad Bachri Amran
Jurnal Serambi Engineering Vol. 10 No. 1 (2025): Januari 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Silica-based column particles have been widely developed, but their particle size remains very small and heterogeneous, typically less than 3 µm. This small and inconsistent size poses challenges for interacting with the mobile phase during the separation of specific components due to the instability of the column particles . To address this issue, a method was developed using a methacrylate-based polymer core coated with silica and phenyl groups. The goal was to test column particles with a polymer core as the base, expecting improved performance compared to silica cores, with a target particle size >3 µm. This study evaluated the new method for separating paracetamol and caffeine, achieving excellent separation results (Rs 3.86). The method was optimized using a mobile phase consisting of methanol and water (60:40), a flow rate of 1.0 mL/min, and a wavelength of 274 nm. A single injection resulted in peak 1 for paracetamol and peak 2 for caffeine. The success of this method is evidenced by the production of sphere, homogeneous, with an average size of 3.17 µm. This analytical method has been effectively applied to the separation of paracetamol and caffeine, demonstrating its suitability  for continuous use in drug separation validation.
Synthesis of Vinyl Modified Silica as a High-Performance Liquid Chromatography Stationary Phase Alzena, Ardine Zada; Rusli, Handajaya; Alni, Anita; Amran, Muhamad Bachri
Jurnal Kartika Kimia Vol 8 No 1 (2025): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v8i1.893

Abstract

Silica can be produced through hydrolysis in alkaline conditions via the Stober process and has two main functional groups, namely siloxane (Si-O-Si) and silanol (Si-OH). Vinyl modified silica can be produced from the hydrolysis of tetraethyl orthosilicate (TEOS) and vinyl trimethoxysilane (VTMS) with 25%(v/v) ammonia. VTMS is used as a silica surface modifying agent. The resulting silica-vinyl modification is then used as a stationary phase to fill a High Performance Liquid Chromatography (HPLC) column. The aim of this research is to synthesize vinyl-modified silica as a HPLC stationary phase and test its performance. Silica-vinyl modification is carried out by first synthesizing silica from TEOS and then modifying the surface using VTMS. Characterization was carried out using a Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). SEM characterization gave a spherical shape and a diameter of 1.73-2.02 μm. FTIR identification gave good results with the identification of siloxane signals (Si-O-Si) at 1,097 cm-1 on silica and 2,850 cm-1 and 2,922 cm-1 which were C-H vibrations on silica-vinyl. Qualitative identification carried out by the addition of alkenes with I2 also shows the binding of vinyl groups to the silica surface. The modified silica is then loaded into a 50 mm x 4.6 mm column. The performance test was carried out by separating caffeine and paracetamol compounds. Optimum separation of MeOH:HOH 1:99 eluent with a flow rate of 1 mL/min. The resulting resolution is 1,80 and selectivity is 1.52. The resulting calibration curve has an R2 value of 0.99156 for caffeine and 0.99431 for paracetamol.
Development of Analytical Method for Determination of Palm-Based Hydrotreated Vegetable Oil (Hvo) in Diesel Blends Using Gas Chromatography: Preliminary Study Sylvia Ayu Bethari; Handajaya Rusli; Muhammad Bachri Amran
Scientific Contributions Oil and Gas Vol 48 No 2 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i2.1816

Abstract

Hydrotreated vegetable oil (HVO) is a renewable paraffinic biofuel derived from the catalytic hydrotreatment of triglycerides, particularly from palm oil. Because HVO's hydrocarbon structure is so similar to petroleum diesel, it can be mixed directly with regular diesel fuel. But because of this structural similarity, it is very difficult to accurately quantify HVO in diesel blends, which is essential for maintaining fuel quality and complying with regulations. In this study, gas chromatography–mass spectrometry (GC-MS) was used to identify the compounds and gas chromatography–flame ionization detection (GC-FID) was developed to quantify biofuel HVO. The chromatographic profiles of diesel, HVO, and biodiesel displayed distinct hydrocarbon distributions. Two diagnostic peaks at retention times of 17.5 – 17.7 minutes, identified as heptadecane and 2,6,10,14-tetramethylpentadecane (pristane), were used for preliminary identification. The heptadecane peak, present in both diesel and HVO, was selected as a quantifier, while the heptadecane-to-pristane ratio of 1.25 in diesel was applied as a correction factor. The accuracy of the method was confirmed by the observation of a strong linear correlation (R2 = 0.9991) for HVO concentrations ranging from 0 to 40% v/v. Recovery rates ranging from 97.0% to 102.2% further illustrated how reliable the method is for routinely analyzing the amount of HVO in diesel blends.
Co-Authors Abdullah, Karim Alzena, Ardine Zada Anita Alni, Anita Annisa Mutiara Fitri Arij Mahmoud Ahmed Abdalla Indah Permata Cantika Kadja, Grandprix Thomryes Marth Karim Abdullah Khoirul Ihsan Solihin Muhamad Bachri Amran Muhammad Ali Zulfikar Muhammad Bachri Amran Muhammad Bachri Amran Muhammad Bachri Amran Muhammad Iqbal Novilia Novilia Rusnadi Rusnadi Sri Dewi Lestari, Sri Dewi St Mardiana Sylvia Ayu Bethari Sylvia Ayu Bethari