Dwiarso Rubiyanto

Universitas Islam Indonesia | UII · Department of Chemistry

Ruku-ruku (Ocimum sanctum, L.) and selasih ungu (Ocimum canum, Sims.) were local types of basils (Ocimum basilicum, L.) found in Indonesia. They exhibited a good fruit fly attractant activitiy as they contained a specific chemical known as methyl eugenol. Fruit fly often pointed out to responsible for damage of some agricultural products such as me...

Kaffir lime oil has been isolated from fruit peel and leaf with different preparations. The fruits and leaf were obtained from Sedayu sub-district, Bantul Regency. The raw materials are prepared into different form i.e. grinded peel (A), pieces peel (B), grinded leaf (C) and intact leaf (D). Each raw material is distilled using water distillation e...

This work studied the use of chitosan-based edible coatings enriched with essential oils to improve storability of strawberries. It was started by analysis of the essential oil (Lemongrass oil and Basil oil) by gas chromatography-mass spectrometry. The main constituent of those essential oils was citral, as an antifungal activity. The edible coatin...

The conversion of citronellal into isopulegol is a key route in the production of a number of important chemicals. In the perspective of green conversion, the use of a heterogeneous catalyst is superior due to its ease in separation and reusability, so it facilitates a highly economical conversion. In this review, we examine the use of some transit...

Microwave-assisted synthesis method was applied for producing porous clay heterostructure-Zn/Si heterostructure from Indonesian natural montmorillonite. The porous montmorillonite heterostructure was prepared by previously intercalating cetyl trimethyl ammonium as templating agent and surfactant, and trimethyl ammonium hydroxide as co-surfactant, f...

Nanocomposites of tin oxide immobilized in montmorillonite (Mt) with various Sn/Mt. mole-to-mass ratios were prepared for photocatalysis application. The prepared samples were characterized by x-ray diffraction, transmission electron microscopy, N2 adsorption–desorption analysis, and diffuse reflectance UV–visible spectroscopy. The relationships be...

The isolation and identification of physico-chemical properties of fresh and wilted cananga (Cananga odorata) essential oil were conducted. Essential oil of cananga flower was isolated by steam distillation method. The chemical components of the two conditions of the cananga flower were analyzed using the GCMS instrument. Several physical parameter...

E-learning services are ’weapons’ or ’tools’ that are very powerful in college education in the 21st century. The characteristics of e-learning are students who need to learn and seek as much information as possible. The purpose of implementing e-learning in essential oil chemistry lectures which is supported by practicum is to improve understandin...

Dimethyl carbonate (DMC) is an alternative replacement for dimethyl sulfate (DMS) and methyl halides which can be used in the methylation reaction of phenolic compounds. This comparative study will be conducted on the synthesis of eugenol to methyl eugenol using dimethyl carbonate (DMC) reagent with phase transfer catalyst (PTC) tetra butyl ammoniu...

Application of retrosynthesis module in Synthetic Organic Chemistry Course using Student Centered Learning (SCL) method is expected to encourage and direct students to find the right way of learning and facilitated by the availability of supporting modules so that the above problems are expected to be resolved. The application of this retrosynthesi...

Green conversion in organic synthesis is one of the interesting and important topics in green chemistry. The use of heterogeneous catalysis instead of homogeneous catalysis offers some advantages, such as easy separation and reusability. In this research, a heterogeneous acid catalyst was prepared from saponite by immobilizing ZnO in the form of a...

Green conversion in organic synthesis is one of the interesting and important topics in green chemistry. The use of heterogeneous catalysis instead of homogeneous catalysis offers some advantages, such as easy separation and reusability. In this research, a heterogeneous acid catalyst was prepared from saponite by immobilizing ZnO in the form of a...

Andrographis paniculata Ness is one of the plants that is under explored and could contain potentially active substances to serve as an antimalarial. Structure investigation of major compounds that have responsibility for the antimalarial activity of Andrographis paniculata Ness ’s n-hexane extract is very important so that it is known whether the...

Citral and citronellal are important chemicals in the pharmaceutical and chemical industries, since they can be converted into other more valuable chemicals that are needed in many pathways. From the perspective of green catalysis, the present investigation examines the preparation of a recyclable heterogeneous catalyst of ruthenium-supported sapon...

There are several challenges arose in the conduct of subjects which are supported with the laboratory (lab) works as it was found in the course of Chromatography in the Study Program of Chemistry, Universitas Islam Indonesia. Firstly, the theoretical aspects in this course which are delivered in the class lecture were considered very broad and incl...

The study of addition H2O to the alpha-pinene conversion into terpineol using H2SO4 catalyst has been carried out. The conversion process carried out using a hydration reaction for 4 hours with the variation of the number of water. The mole ratio of alpha-pinene to water l:5, 1:10,1:15, 1:20,1:25. While the H2SO4 as catalyst concentration has equat...

Penelitian terhadap variasi waktu dalam konversi É‘-pinene menjadi terpeniol menggunakan katalis asam sulfat telah dilakukan. Konverci É‘-pinene dilakukan menggunakan metode hidrasi dengan variasi waktu; 1 jam, 4 jam,5 jam, 6 jam dan 7 jam. Larutan yang terdiri dari É‘-pinene, H2SO4 dan aquades dengan perbandingan l:l:5 direfluks dalam medium aseto...

In this paper, potassium fluoride (KF) modification of hydrotalcite (HT) and its activity as a solid base catalyst for microwave (MW) assisted biodiesel conversion was investigated. The catalyst was prepared simply and rapidly by the solid reaction of KF and HT, and characterization was performed using x-ray diffraction, surface profile analysis us...

Purpose Purpose of this study is to prepare composite of chitosan-modified smectite clays consist of montmorillonite (MMt) and saponite (SAP) clay minerals and their urea adsorption-desorption study. Prepared materials were designed for slow release fertilizer application. Design/methodology/approach Preparation of the composites was conducted b...

P REPARATION catalyst application of reusable on biodiesel catalyst conversion based on has KF-modified been investigated. kaolinite Materials clay for preparation reusable were carried out by simple mixing and solid reaction between KF and kaolinite at various KF loading. The effect of KF content loaded the surface structure and surface basicity h...

In this research, modeling several alkyl p-methoxy cinnamate (APMC) based on electronic transition by using semiempirical mechanical quantum ZINDO/s calculation is performed. Alkyl cinnamates of C1 (methyl) up to C7 (heptyl) homolog with 1-5 example structures of each homolog are used as materials. Quantum chemistry–package software Hyperchem 8.0 i...

Improvement of the quality of crude clove bud oil (crude CBO) by bentonite adsorption process in flow system had been done. This research aimed to improve the quality of crude CBO based on SNI 06-4267-1996 and SNI 06-2387-2006. The parameters were colours, densities, refractives index, eugenol and trans-caryophillene contents and also the additiona...

Slow release fertiliser (SRF) is one of the important materials, which provides benefit to the green chemistry and green chemical engineering in the agricultural applications. Various modifications on porous materials and super-Adsorbent based composites have been developed to act as the host for fertilisers including nitrogenbased fertilisers. In...

This study aimed to investigate the physico-chemical properties of Pt dispersed in Al and Zr pillared saponite and montmorillonite. The chemical and morphological characteristics of prepared materials were carried out by using X-ray diffraction, scanning electron microscopy and Lewis to Brøensted acidity ratio (L/B) by pyridine adsorption followed...

This study was conducted to determine the harmful compounds in perfumes by gas chromatography-mass spectrometry (GC-MS). Perfume samples (A, B, C) obtained from the supermarket and the refill perfume fragrance that is almost the same. Methodology is the determination of specific gravity and refractive index. Chemical analysis performed using gas ch...

The influence of calcination temperature on the synthesis of zirconia-pillared saponite (PILS) and on its catalytic activity in menthol esterification has been studied. Zirconia pillarization was conducted using zirconium tetraisopropoxide as a precursor and with calcination temperatures of 450, 600 and 700 °C. Evaluation of physicochemical charact...

Nickel dispersed on sulfated zirconia pillared montmorillonite was prepared by three main steps; zirconia pillarization, sulfation and nickel dispersion. The synthesized material was characterized with FTIR spectroscopy, elemental analysis, x-ray diffraction and gas sorption analyzer before was tested for microwave assisted citronellal conversion v...

The three species of basil (Ocimum basilicum) i.e. lemon basil (O. citriodorum), purple basil (O. canum) and green basil (O. violaceum) had been analyzed to derived their complete chemo type. Ten series of time difference in wilting of aerial part of basil were plotted in different harvesting period. Each accession of Ocimum species underwent air d...

World demand on menthol is so high and it is also a chalenge for organic synthetic chemist to develop new method of synthesis and conversion from another sources. Tandem cyclization-hydrogenation reaction towards citronellal is one important mechanism recently. Within the mechanism, hydrogenation of isopulegol is rate determining step. Considering...

Preparation of novel sulfated zirconia-pillared clays nanoparticles(SZ/MMT) was studied to find a highly active, economist and environmental friendly catalyts in the conversion of citronellal into menthol. SZ/MMT was prepared by direct sulfatation into zirconia-pillared montmorillonite which is a new and fast technique. Comparative study also condu...

Preparation of sulfated zirconia-pillared montmorillonite was carried out in two steps; zirconia pillarization and sulfation to zirconia-pillared montmorillonite. The prepared materials were characterized by using X-ray diffraction (XRD), measurement of the specific surface area, total pore volume and pore size distribution by the N 2 adsorption me...

Green basil (Ocimum violaceum , Linn.) plantis part of the varieties of basil (Ocimum basilicum, Linn.). Green basil essential oil (GBEO) contain chemical compounds that have an anti- bacterial activities . Methyl eugenol and methyl chavikol are in green basil oil has the potential to be used as a material which is biologically active. Conversion r...

Pogostemon cablin benth is an economic source of farmer communities which are presence in several provinces in Indonesia. In general, the production and quality of the Pogostemon cablin benth produced by the farmers are still low or under the standard ISO. The chelating method, the influence of pH and adsorption method with activated carbon and mon...

Telah dilakukan reaksi tandem hidrogenasi-siklisasi menuju menthol dari citronellal secara satu tahap dengan variasi metode berkatalis ZrO2-montmorillonite (Zr-MMT). Tujuan penelitian adalah untuk menentukan keefektifan katalis Zr-MMTdengan dua metode: metode dengan sistem flow terhadap campuran sitronellal-katalis setelah proses refluks dengan tek...

Catalytic conversion of citronellal to isopulegol over TiO2/SiO2-montmorillonite catalyst was studied for citronellal isolated from Cymbopogon leaf oil. The role of physico-chemical characteristics of montmorillonite and SiO2-montmorillonit catalyst on total conversion, activity and selectivity to produce isopulegol was studied. Activity test was c...