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Alchemy : Journal of Chemistry

Kimia
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Published by Universitas Islam Negeri Maulana Malik Ibrahim Malang

ISSN : 20861710 EISSN : 24606871 DOI : http://dx.doi.org/10.18860/al

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology

ALCHEMY: Journal of Chemistry (eISSN 2460-6871) is a scientific journal that focus on chemistry. This journal publishes a scientific article that cover research and review articles. Research topics for this journal such as natural science, physical chemistry, inorganic chemistry, organic chemistry, environment, biochemistry, marine, energy and other related-sciences. ALCHEMY: Journal of Chemistry also accepts article about halal products and chemistry on Islamic perspectives.

Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)

Articles 203 Documents

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Aktivitas Antioksidan Kombinasi Madu Monoflora dengan Ekstrak Daun Namnam (Cynometra cauliflora L.) La Ode Sumarlin; Melina Hadera; Sri Yadial Chalid; Dede Sukandar
ALCHEMY:Journal of Chemistry Vol 6, No 1 (2018): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Honey and namnam leaves (Cynometra cauliflora L.) have been shown to have antioxidant activity. Combination of both materials potent to be used as functional food. In this study, antioxidant activity of samples was measured by the DPPH method (1,1-diphenyl-2-picrylhydrazyl) (IC50) while total phenolic, total flavonoids, and vitamin C were determinated by UV-Vis spectrophotometry. Honey samples used were commercial packaging rambutan honey (MR), commercial packaging rubber honey (MK), and commercial unpackaging rambutan honey (MR2). The combination ratio of honey and namnam leaves extract was 1:1, 1:2 and 2:1 (b/b). The highest value of total phenolic, total flavonoids, vitamin C and antioxidant activity in namnam leaves extract (N) was 267.690 mg GAE/g, 12.284 mg QE/g, 203.500 mg AA/g and IC50 0.004 mg/mL, respectively. The highest value of total phenolic was 0.588 mg GAE/g in MR2, while the highest value of total flavonoids and antioxidant activity (IC50) were 0.027 mg QE/g and 21.576 mg/mL in in MR, respectively. Combination MR and MR2 with namnam leaves extract (MR-N and MR2-N) with ratio 1:2 gave the highest antioxidant activity with IC50 value 0.005±0.000 mg/mL in both samples. The highest value of total phenolic, total flavonoid, and vitamin C in MR-N and MR2-N was 266.027 mg GAE/g, 9.790 mg QE/g, and 100.33 mg AA/g, respectively. Therefore, the combination is potential as a functional food Madu dan daun namnam (Cynometra cauliflora) telah terbukti memiliki aktivitas antioksidan. Kombinasi kedua bahan ini akan sangat potensial digunakan sebagai pangan fungsional. Pada penelitian ini, antioksidan diukur dengan metode DPPH (1,1-difenil-2-pikrilhidrazil) (IC50), sedangkan total fenolik, total flavonoid, vitamin C menggunakan spektrofotometer UV-Vis. Sampel madu yang digunakan adalah madu rambutan kemasan komersial (MR), madu karet kemasan komersial (MK), dan madu rambutan tanpa kemasan komersial (MR2). Perbandingan kombinasi madu dan ekstrak daun namnam masing-masing 1:1, 1:2 dan 2:1 (b/b). Hasil analisis menunjukkan bahwa total fenolik, total flavonoid, vitamin C dan aktivitas antioksidan tertinggi terdapat pada ekstrak daun namnam (N) masing-masing sebesar 267,690 mg GAE/g, 12,284 mg QE/g, 203,500 mg AA/g dan IC50 0,004 mg/mL. Kandungan total fenolik tertinggi pada sampel madu adalah MR2 sebesar 0,588 mg GAE/g, sedangkan total flavonoid dan aktivitas antioksidan tertinggi pada MR yaitu 0,027 mg QE/g dan IC50 21,576 mg/mL. Sampel MR dan MR2 kombinasi dengan ekstrak daun namnam (MR-N dan MR2-N) dengan perbandingan 1:2 memberikan aktivitas antioksidan tertinggi dengan nilai IC50 sebesar 0,005 ± 0,000 mg/mL. Total fenolik, total flavonoid, dan vitamin C tertinggi pada kombinasi MR-N dan MR2-N masing-masing sebesar 266,027 mg GAE/g, 9,790 mg QE/g, dan 100,33 mg AA/g. Oleh karena itu, kombinasi tersebut potensial sebagai pangan fungsional

Perbandingan Butiran Kitosan dengan Pengikat Silang Epiklorohidrin (ECH) dan Glutaraldehid (GLA): Karakterisasi dan Kemampuan Adsorpsi Timbal (Pb) Armeida Dwi Ridhowati Madjid; Merpiseldin Nitsae; Akhmad Sabarudin
ALCHEMY:Journal of Chemistry Vol 6, No 1 (2018): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Chitosan was an abundantly available source but it has a drawback which unstable in acid or base. So, it must be added with a crosslinker. In this article, we would compare the using of 2 crosslinkers, glutaraldehyde (GLA) and epichlorohydrin (ECH). Chitosan was formed as bead using tripolyphosphate (TPP). Chitosan beads crosslinked with GLA became browny beads and chitosan beads crosslinked with ECH became pearly white. IR characterization showed peaks in 1640 and 1540 cm-1 represent phosphate contained TPP. There is no significant or unique peak differ GLA chitosan bead from ECH chitosan bead. Adsorption capacity of lead (Pb) in ECH chitosan bead was higher than in GLA chitosan bead. Morphology in SEM characterization exhibited a crinkle GLA chitosan bead then ECH chitosan bead. Kitosan merupakan polimer alam dengan ketersediaan yang meruah tetapi memiliki kelemahan yaitu kurang stabil dalam asam maupun basa sehingga diperlukan pengikat silang. Dalam artikel ini akan dibandingkan dengan penggunaan 2 agen pengikatsilang yang dapat mengatasi permasalahan tersebut yaitu epiklorohidrin (ECH) dan glutaraldehid (GLA). Untuk pembuatan butiran kitosan digunakan tripolyphosphate (TPP). Setelah menjadi butiran kitosan diikatsilangkan dengan GLA menjadi butiran kitosan yang berwarna kecoklatan dan diikatsilangkan dengan ECH menjadi butiran kitosan bening. Karakterisasi spektrofotometri Infra Merah menunjukkan puncak pada daerah 1640 dan 1540 cm-1 yang merupakan serapan khas dari tripolyphospate sedangkan tidak nampak perbedaan puncak spektra yang signifikan dari butiran kitosan GLA maupun ECH. Kemampuan adsorpsi butiran logam timbal (Pb) butiran kitosan ECH lebih tinggi jika dibandingkan dengan butiran kitosan GLA. Morfologi butiran kitosan dianalisis menggunakan Scanning Electron Morphology (SEM) dan menunjukkan bahwa morfologi untuk butiran GLA memiliki morfologi yang lebih berkerut jika dibandingkan dengan butiran ECH.

Identifikasi Senyawa Kuersetin dari Fraksi Etil Asetat Ekstrak Daun Alpukat (Persea americana Mill.) Elly Rustanti; Qurrotu A'yunin Lathifah
ALCHEMY:Journal of Chemistry Vol 6, No 2 (2018): ALCHEMY: Journal of Chemistry
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Avocado leaves (Persea americana Mill.) have many benefits in our health because the leaves contain many secondary metabolites. One of the secondary metabolites in avocado leaves is quercetin. Quercetin is the largest compound of the flavonols group in which percentage of quercetin and its glycosides is 60-75% of total flavonoids. The purpose of this study was to isolate quercetin compounds from ethyl acetate fraction of ethanol extract of avocado leaves and to determine the presence of quercetin compounds in the avocado leaves. The leaves were extracted by maceration using 95% ethanol and fractionated with ethyl acetate. Identification of quercetin compounds using liquid chromatography-mass spectrometry (LC-MS). The results of this study indicated that avocado leaf extract contained quercetin compounds with a retention time of 5.83 minutes with molecular weight m/z = 300.50-301.50 [M-H]+. Keywords: Avocado leaves, quercetin, LC-MS Daun alpukat (Persea americana Mill.) banyak memiliki kegunaan dalam kesehatan karena mengandung banyak metabolit sekunder. Salah satu metabolit sekunder yang terkandung dalam daun alpukat adalah kuersetin. Kuersetin adalah senyawa kelompok flavonol terbesar yang mana kuersetin dan glikosidanya berada dalam jumlah sekitar 60-75% dari flavonoid. Tujuan dari penelitian ini adalah untuk mengisolasi senyawa kuersetin dari fraksi etil asetat dari ekstrak etanol daun alpukat dan untuk mengetahui adanya senyawa kuersetin dalam daun alpukat. Daun alpukat diekstraksi dengan metode maserasi menggunakan pelarut etanol 95% dan difraksinasi dengan etil asetat. Identifikasi senyawa kuersetin dengan menggunakan kromatografi cair-spektrometri massa (KC-SM). Hasil dari penelitian ini menunjukkan bahwa dalam ekstrak daun alpukat mengandung senyawa kuersetin dengan waktu retensi 5,83 menit dengan berat molekul m/z= 300,50-301,50 [M-H]+. Kata kunci: Daun alpukat, kuersetin, KC-SM

Aktivitas Antimalaria Ekstrak Kasar Etanol dan Fraksi n-Heksana Rumput Bambu (Lophatherum gracile B.) secara in Vitro Ella Wulandari; Dewi Yuliani; Elok Kamilah Hayati; Roihatul Muti'ah
ALCHEMY:Journal of Chemistry Vol 6, No 1 (2018): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Malaria is a disease caused by infectious parasite Plasmodium falciparum and can be transmitted through mosquito bite. The aim of this research was to study antimalarial activity in vitro on crude ethanol extract and n-hexane fraction of bamboo grass (Lophatherum gracile B.). Extraction was carried out by ethanol 80% solvent and fractionation was conducted by n-hexane. Determination of antimalarial activity was subjected to P. falciparum strain 3D7. According to phytochemical test, crude ethanol extract contained tannin and terpenoid, whilst n-hexane fraction contained tannin and steroid. The capability of crude ethanol extract and n-hexane fraction to inhibit P. falciparum was represented by IC50 value. The value of both samples respectively was 12.49 and 61.49 µg/mL. Identification based on LC-MS (liquid chromatography-mass spectrometry), n-hexane fraction shown the presence of tannin and steroid compounds. Malaria merupakan penyakit yang disebabkan oleh infeksi parasit Plasmodium falciparum yang dapat ditularkan melalui gigitan nyamuk. Penelitian ini bertujuan untuk mengetahui aktivitas antimalaria secara in vitro pada ekstrak kasar etanol dan fraksi n-heksana rumput bambu (Lophatherum gracile B.). Proses ekstraksi dilakukan dengan pelarut etanol 80% dan fraksinasi dengan n-heksana. Uji aktivitas antimalaria dilakukan pada parasit P. falciparum strain 3D7. Hasil uji fitokimia menunjukkan ekstrak etanol mengandung tanin dan terpenoid, sedangkan fraksi n-heksana mengandung tanin dan steroid. Kemampuan ekstrak etanol dan fraksi n-heksana dalam menghambat parasit P. falciparum menghasilkan nilai IC50 masing-masing sebesar 12,49 dan 61,49 µg/mL. Identifikasi senyawa dengan KC-SM (kromatografi cair-spektrometri massa) pada fraksi n-heksana menunjukkan adanya senyawa tanin dan steroid.

Pemisahan Senyawa Aktif Fraksi Petroleum Eter dan Etil Asetat Hasil Hidrolisis Ekstrak Etanol Hydrilla verticillata dari Ranu Grati Pasuruan Suci Amalia; Ahmad Ghanaim Fasya; Faiqotul Hasanah; Dewi Yuliani
ALCHEMY:Journal of Chemistry Vol 6, No 2 (2018): ALCHEMY: Journal of Chemistry
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Hydrilla verticillata is one of water plants that has some bioactivities. The presence of secondary metabolites in H. verticillata is responsible for the bioactivity. The purpose of this study was to determine and separate bioactive compounds from fraction of petroleum ether (PE) and ethyl acetate (EA) as a result of hydrolysis of H. verticillata ethanol extract. H. verticillata was extracted by maceration method using ethanol solvent, hydrolyzed with hydrochloric acid and partitioned respectively with petroleum ether and ethyl acetate. Crude ethanol extract, PE and EA fraction were identified their secondary metabolites. The phytochemical test results showed H. verticillata ethanol extract containing alkaloid compounds, flavonoids, tannins, saponins, triterpenoids, and steroids. PE fraction contained steroids and terpenoids, while EA fraction contained flavonoids, steroids, and triterpenoids. Analytical thin layer chromatography analysis showed n-hexane : ethyl acetate (4: 1) eluent as the best mobile phase for separating steroids. The preparative thin layer chromatography analysis of H. verticillata fraction using n-hexane : ethyl acetate (8: 2) as mobile phase resulted in 17 and 14 spots of PE and EA fractions, respectively.Keywords: Hydrilla verticillata, thin layer chromatography, phytochemicals Hydrilla verticillata merupakan salah satu tanaman air yang banyak memiliki bioaktivitas. Adanya metabolit sekunder pada H. verticillata yang bertanggung jawab terhadap bioaktivitas ini. Tujuan penelitian ini adalah untuk mengetahui dan memisahkan senyawa aktif dari fraksi petroleum eter (PE) dan etil asetat (EA) hasil hidrolisis ekstrak etanol H. verticillata. Ekstrak diperoleh dengan metode maserasi menggunakan pelarut etanol, dihidrolisis dengan asam klorida dan dipartisi masing-masing dengan petroleum eter dan etil asetat. Ekstrak kasar etanol, fraksi PE dan EA diuji kandungan metabolit sekundernya. Hasil uji fitokimia menunjukkan ekstrak etanolH. verticillata mengandung senyawa alkaloid, flavonoid, tanin, saponin, triterpenoid, dan steroid. Fraksi PE mengandung steroid dan terpenoid, sedangkan fraksi EA mengandung flavonoid, steroid, dan triterpenoid. Hasil analisis KLTA menunjukkan eluen n-heksana : etil asetat (4:1) sebagai fasa gerak terbaik untuk memisahkan steroid.Hasil analisis KLTP fraksi H. verticillatamenggunakan perbandingan fasa gerak n-heksana : etil asetat (8:2) menghasilkan spot fraksi PE dan EA berturut-turut sebanyak 17 dan 14 spot.Kata Kunci: Hydrilla verticillata, kromatografi lapis tipis, uji fitokimia

Variasi Diameter Kolom dan Rasio Sampel-Silika pada Isolasi Steroid dan Triterpenoid Alga Merah Eucheuma cottonii dengan Kromatografi Kolom Basah Ahmad Ghanaim Fasya; Ariska Purwaning Tyas; Fitroh Annasaul Mubarokah; Rachmawati NIngsih; Armeida D. R. Madjid
ALCHEMY:Journal of Chemistry Vol 6, No 2 (2018): ALCHEMY: Journal of Chemistry
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Optimizing steroid and triterpenes isolation from red algae Eucheuma cottonii was done using column chromatography by varying of column diameter (1, 1.5 and 2 cm) and a ratio of sample : silica (1:50, 1:100, and 1:150). Active compound of E. cottonii was extracted by maceration with methanol. Then, the extract was hydrolyzed using HCl 2 N and partitioned with petroleum ether. The extract after partitioned was separated using wet column chromatography. The result of separation was monitored using analytical thin layer chromatography (Analytical TLC) and identified using FTIR. The best separation was aimed using diameter column 1 cm and a ratio of sample : silica 1:150. Based on FTIR analysis, the steroid from extract had a functional group –OH, –C–H, C=O, -C(CH3)2, and C-OH alcohol and the triterpenoid from extract had a functional group –OH, C–H, C=O, C=C, -C(CH3)2 and C-OH alcohol.Keywords: E. cottonii, column chromatography, steroid, triterpenoid, column size, sample : gel silica ratio Optimasi isolasi senyawa steroid dan triterpenoid dalam alga merah Euchema cottonii telah dilakukan menggunakan kromatografi kolom dengan variasi diameter kolom (1; 1,5; dan 2 cm) dan rasio sampel : silika (1:50; 1:100; dan 1:150). Ekstraksi senyawa aktif pada E. cottonii dilakukan dengan maserasi menggunakan pelarut metanol. Ekstrak pekat metanol dihidrolisis menggunakan HCl 2 N dan dipartisi dengan petroleum eter. Hasil pemisahan dimonitoring menggunakan KLTA dan diidentifikasi menggunakan FTIR. Hasil penelitian menunjukkan pemisahan kromatografi kolom terbaik diperoleh dengan variasi diameter 1 cm dan variasi rasion sampel : silika 1:150. Hasil analisis senyawa steroid memberikan informasi gugus –OH, –C–H, C=O, -C(CH3)2, dan C-OH alkohol, sedangkan senyawa triterpenoid memberikan informasi gugus –OH, –C–H, C=O, C=C, -C(CH3)2 dan C-OH alkohol.Kata Kunci: E. cottonii, kromatografi kolom, steroid, triterpenoid, ukuran kolom, rasio sampel : silika gel

Terapi Infusa Pekat Buah Pare (Momordica charantia L.) terhadap Kadar Glukosa Darah dan SOD pada Ginjal Tikus DM Tipe 1 Nuraeni Uswatun Hasanah; Hafidatul Hasanah; Hummatul Barroroh
ALCHEMY:Journal of Chemistry Vol 6, No 2 (2018): ALCHEMY: Journal of Chemistry
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Bitter melon (Momordica charantia L.) is one of the Cucurbitaceae families which is useful as traditional antidiabetic medicine. Diabetes mellitus (DM) is an autoimmune disease indicated by increasing blood sugar levels. The aim of this study to determine the effect of concentrated infusions therapy of bitter melon fruit on blood glucose levels and SOD activity in three diabetic levels (low, medium, acute) in DM Type 1 of rat kidney. The doses of therapy used were 0.15, 0.30, 0.45, 0.60, 0.80 and 1 mL/200 g body weight (BW). Blood sugar level was measured using enzymatic (glucose oxidase) method and SOD activity using NBT (Nitroblue tetrazolium) test. The results showed that the concentrated infusions therapy of bitter melon fruit was able to decrease blood glucose levels and increase the SOD activity of DM 1 in the rat kidney. The average ability of the therapy to reduce DM in low, medium, and acute level was 87.21, 84.5 and 55,56%, respectively. In 0.3 mL/200 g Bw dose, concentrated infusions therapy of bitter melon fruit reduced blood sugar level to all diabetes levels. The average value of concentrated infusions therapy of bitter melon fruit in increasing SOD activity was 144.76%. Keywords: Diabetes mellitus, infuse, SOD (superoxide dismutase), bitter melon fruit (Momordica charantia L.) Buah pare (Momordica charantia L.) merupakan salah satu keluarga Cucurbitaceae yang bermanfaat sebagai obat tradisional, salah satunya untuk antidiabetes. Diabetes mellitus (DM) merupakan salah satu penyakit autoimun yang ditandai dengan meningkatnya kadar gula darah (KGD). Penelitian ini bertujuan untuk mengetahui pengaruh terapi infusa pekat buah pare terhadap kadar glukosa darah dan SOD pada tiga tingkat diabetes yaitu ringan, sedang dan akut pada ginjal tikus DM tipe 1. Dosis yang digunakan yakni 0,15; 0,30; 0,45; 0,60; 0,80; dan 1 mL/200 g BB. KGD diiukur dengan metode enzimatik (glukosa oksidase) dan aktivitas SOD diukur dengan uji NBT (Nitroblue tetrazolium). Hasil penelitian menunjukkan terapi infusa pekat buah pare berpengaruh terhadap penurunan kadar glukosa darah dan peningkatan kadar SOD pada ginjal tikus DM 1. Kemampuan rata-rata terapi dalam menurunkan DM tingkat ringan, sedang, dan akut masing-masing sebesar 87,21; 84,5 dan 55,56%. Pada dosis 0,3 mL/200 g BB, terapi infusa pekat buah pare mampu menurunkan KGD terhadap seluruh tingkat DM. Kemampuan rata-rata infusa pekat buah pare dalam meningkatkan kadar SOD sebesar 144,76%. Kata Kunci: Diabetes mellitus, infusa, SOD (superoksida dismutase), buah pare (Momordica charantia L.)

Synthesis of Goethite (α-FeOOH) Pigment by Precipitation Method from Iron Lathe Waste Lilik Miftahul Khoiroh; Elysia Dwi Nuraini; Nur Aini
ALCHEMY:Journal of Chemistry Vol 6, No 2 (2018): ALCHEMY: Journal of Chemistry
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Lathe waste contains high iron content potential to be further processed into goethite pigment. The purpose of the research was to determine the effect of synthesis temperature on the structure, colour values, and morphology of goethite pigment. The synthesis was conducted with temperature variations of 60, 70, 80and 90°C. The XRD diffraction pattern shows that crystal structure of the product of all synthesis temperatures are goethite (α-Fe-OOH) with orthorhombic structure. The crystal size of the pigment ranges between 11.17 – 12.32 nm. Colour value analysis shows that product of 70°C synthesis temperature exhibits the highest lightness value about 40.5. Based on SEM-EDX imaging, the morphology of the samples is not uniform and forming agglomerates. Traces of impurities were detected, such as C and Na. Keywords: Iron lathe waste, goethite, temperature, precipitation

Acid and Enzymatic Hydrolyses of Rice Bran for Bioethanol Production Dewi Yuliani; Khoirul Achmad Julianto; Akyunul Jannah
ALCHEMY:Journal of Chemistry Vol 6, No 1 (2018): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Rice bran is one among many agricultural by-products containing ~50-60 wt.% of carbohydrate. The carbohydrate is a prominent sugar source for bioethanol production. The objective of this research was to study bioethanol production from rice bran by acid and enzymatic treatment. The variations of acid used were dilute hydrochloric acid and sulphuric acid, while variations of enzyme used were amylolytic and cellulolytic enzyme. Ethanol production of acid-hydrolyzed rice bran was 24.95±1.61% (v/v) by hydrochloric acid and 29.57±2.04% (v/v) by sulphuric acid. Ethanol produced by enzymatic hydrolysis was quite low i.e. 6.7±0.04%, and 8.86±0.29% (v/v) for amylolytic and cellulolytic hydrolysate, respectively. Keywords: Bioethanol, rice bran, acid hydrolysis, enzymatic hydrolysis

Conversion of Crude Glycerol from by-Product Biodiesel into Bio-additive of Fuel through Acetylation Reaction based on Modified Zeolite Catalyst Dewajani, Heny; Zamrudy, Windi; Saroso, Hadi; Paramarta, Satria; Mulya, Wahyudianto
ALCHEMY Vol 7, No 2 (2019): ALCHEMY: Journal of Chemistry
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Biodiesel is one of the alternative fuels produced from the transesterification reaction between triglycerides and alcohols with glycerol by-products. So far, the resulting crude glycerol has not been maximally utilized because of its low purity. So, it is necessary to purify glycerol before turning it into a more useful compound. The purified glycerol can be reacted with acetic acid within esterification reaction (acetylation process) using an acid catalyst to produce glycerol triacetate (triacetin). One of the uses of triacetin as an additive in gasoline and biodiesel. The purpose of this study is to utilize glycerol from by-products from biodiesel production to bio-additive materials that can improve fuel quality and are environmentally friendly. The method used in this study begins with the purification of crude glycerol, modification of zeolite catalyst with impregnated of nickel metal followed by an acetylation reaction which held on temperature of 100Â°C for 60 min. The experimental results are analyzed using base titration to determine the remaining unreacted acids and are applied as bio-additives by adding them to commercial fuels and measured the increasing octane numbers. The result shows that the reaction conversion increases with increasing mole ratio of reactants and catalysts with the best results in the mole ratio of acetic acid and glycerol is 9:1 and catalyst 5% by weight of acetic acid with a conversion of 66.02%. As bio-additives the reaction product could increase the octane number of commercial fuel by 6.5 up to 8.5%.Â Keywords: glycerol, acetylation reaction, mofified zeolite, bio-additive

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Fakultas Sains dan Teknologi Universitas Islam Negeri (UIN) Maulana Malik Ibrahim Malang Gedung BJ Habibie Lt 2 Jl. Gajayana 50 Malang 65144 Indonesia

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Jawa timur

INDONESIA