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All Journal CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) INDONESIAN JOURNAL OF LEGAL AND FORENSIC SCIENCES Jurnal Kimia (Journal of Chemistry) International Journal of Biosciences and Biotechnology Buletin Udayana Mengabdi INDONESIAN JOURNAL OF BIOMEDICAL SCIENCES Jurnal Veteriner Jurnal Biologi Udayana Jurnal Energi Dan Manufaktur Ecotrophic, Journal of Environmental Science The Journal of Pure and Applied Chemistry Research Chimica et Natura Acta JURNAL PENDIDIKAN TAMBUSAI Jurnal Media Sains AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) COMSERVA: Jurnal Penelitian dan Pengabdian Masyarakat
Ni Made Suaniti
Program Studi Kimia FMIPA Universitas Udayana, Bukit Jimbaran, Bali
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Social Sciences Veterinary

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IDENTIFIKASI EFEDRIN HIDROKLORIDA, DEKSTROMETORFAN DAN TRAMADOL HIDROKLORIDA DALAM TABLET DENGAN SPEKTROSKOPI RAMAN Khairul Mahfuz; I Made Agus Gelgel Wirasuta; Ni Made Suaniti
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 5 No 2 (2017)
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Penelitian ini bertujuan untuk mengetahui perubahan pola spektrum Raman Efedrin Hidroklorida, Dekstrometorfan dan Tramadol Hidroklorida pada tablet obat (Decolsin®,Tramifen®) dan sampel simulasi. Tablet Obat serta sampel simulasi Efedrin Hidroklorida, Dekstrometorfan dan Tramdol Hidroklorida dengan konsentrasi 80%, 60%, 40% dan 20% dalam serbuk Amprotab diukur dengan spektroskopi Raman 1064 nm pada bilangan gelombang 200-2000 cm-1. Hasil yang didapat dianalisis dengan cross correlation function dan dilihat nilai koefisien korelasi (r). Pada masing-masing tablet Obat hanya Parasetamol yang dapat diidentifikasi karena nilai koefisien korelasi r > 0,95. Berdasarkan hasil sampel simulasi diketahui bahwa konsentrasi Efedrin Hidroklorida, Dekstrometorfan dan Tramadol Hidroklorida pada suatu campuran berpengaruh terhadap pola spektrum Raman yang dihasilkan. Pola puncak spektrum Raman untuk identifikasi Efedrin Hidroklorida yaitu pada bilangan gelombang 1305 cm-1 (C-N), 1380 cm-1 (C-CH3), 1662 cm-1 (C=C), 1600 cm-1 (C-OH), dan 315 cm-1 (C-C alifatik); Dekstrometorfan yaitu puncak pada bilangan gelombang 1040 cm-1 (cincin Aromatis I), 1495 cm-1 (cincin Aromatis II), 768 cm-1 (C-Cl), 1580 cm-1 (cincin Hetero), 1667 cm-1 (C=C ) dan 855 cm-1 (C-O-C); Tramadol Hidroklorida yaitu puncak pada bilangan gelombang 1006 cm-1 (cincin aromatis I), 1467 cm-1 (cincin aromatis II), 1552 cm-1 (C-OH), 1635 cm-1 (C=C), 285 cm-1 (C-C Alifatik), 1345 cm-1 (C-N) dan 855 cm-1 (C-O-C). ABSTRACT: The aims of this study were determined to change in the pattern of Raman spectrum of Ephedrine Hydrocloride, Dextrometorfan and Tramadol Hydrocloride on tablet (Decolsin®,Tramifen®) and simulation samples. Tablets and simulation samples of this active compound made in Amprotab with concentration 80%, 60%, 40% and 20% measured by 1064 nm Raman spectroscopy in wave numbers 200-2000 cm-1. The results can be analyzed by cross-correlation function and showed the value of the correlation coefficient r. On tablet only Paracetamol can be identified because it has coefficient correlation r > 0,95. Based on the results of the simulation sample is known that the concentration of active compound in a mixture affect the pattern of the Raman spectra. Peak pattern to identification Ephedrine Hydrocloride is at wave number 1305 cm-1 (C-N), 1380 cm-1 (C-CH3), 1662 cm-1 (C=C), 1600 cm-1 (C-OH), dan 315 cm-1 (C-C alifatik); Dextrometorfan is at wave number 1040 cm-1 (Aromatic Ring I), 1495 cm-1 (Aromatic Ring II), 768 cm-1 (C-Cl), 1580 cm-1 (Hetero Ring), 1667 cm-1 (C=C ) dan 855 cm-1 (C-O-C); Tramadol Hydrocloride is at wave number 1006 cm-1 (Aromatic Ring I), 1467 cm-1 (Aromatic Ring II), 1552 cm-1 (C-OH), 1635 cm-1 (C=C), 285 cm-1 (C-C Alifatik), 1345 cm-1 (C-N) and 855 cm-1 (C-O-C).
KARAKTERISASI BIODIESEL DARI MINYAK JELANTAH MENGGUNAKAN PEREAKSI BIOETANOL TETES TEBU Sagung Ngurah Mayuni; Ni Made Suaniti; Ida Bagus Putra Manuaba
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 3 No 3 (2015)
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Biodiesel merupakan bahan bakar alternatif yang dapat disintesis dari minyak jelantah dan alkohol melalui proses esterifikasi. Penelitian ini menggunakan bahan dasar minyak jelantah dengan kadar asam lemak bebas sebesar 9,16 %, dimana alkohol yang digunakan adalah bioetanol tetes tebu. Tujuan penelitian ini adalah untuk mengkarakterisasi biodiesel hasil esterifikasi dan transesterifikasi minyak jelantah dengan hasil destilasi bioetanol tetes tebu. Metode penelitian yang dilakukan adalah menggunakan perbandingan bervariasi antara minyak jelantah dan etanol yaitu 1 : 1 (B1), 3:1 (B2), 5:1 (B3). Hasil karakterisasi biodiesel diperoleh sesuai dengan SNI berturut-turut untuk densitas B1 = 860,3, B2 = 865,3 , B3 = 866,3 (kg/m3), Viskositas B1 = 19,138 , B2 = 24,881 , B3 = 25,359(mm2/s), Titik NyalaB1 = 138,5, B2 = 93,5, B3 = 212,5 (0C). Titik tuang B1 = 6, B2 = 93,5, B3 = 212,5. Titik Tuang B1 = 6, B2 = 6, dan B3 = 9 (0C). Korosi B1 = 1a, B2 = 1a dan B3 =1a. Untuk kadar air dengan hasil B1 = 0,05, B2 = trace (tidak terdeteksi) dan B3 = 0,2 (% v/v).Biodiesel minyak jelantah dan etanol tetes tebu dapat terbentuk, setelah dianalisis dengan kromatografi gas menunjukkan adanya senyawa ester (etil palmitat, etil linoleat, etil laurat) dengan waktu retensi masing-masing adalah 17,0, 18,6 , 18,7 menit. Berdasarkan hasil penelitian disimpulkan bioetanol tetes tebu dapat digunakan dalam sintesis biodiesel. Penggunaan bioetanol tetes tebu dalam sintesis biodiesel diperoleh karakteristik sesuai dengan Standar Nasional Indonesia (SNI) -04-7182-2006 kecuali viskositas.ABSTRACT: Biodiesel is an alternative energy for fossil fuel. It can be synthesized by esterification of waste cooking oil with alcohol. In this research, the used waste cooking oil contains 9.16 % FFA, while the alcohol used was bioethanol fermented from molase. The aim of this research was to characterize biodiesel produced from esterification and transesterification of used cooking oil with bioethanol molase. The ratios of oil to bioethanol were 1:1 (B1), 3:1 (B2), and 5:1 (B3). Based on the characterizations of the biodiesel, it was found that the density were 860.3, 865.3, 866.3 kg/m3 for B1, B2, B3 respectively. The viscosities were 19.138, 24.881, 25.359 mm2/s for B1, B2, B3 respectively.  The flash points were 138.50C, 93.50C, 212.50C for B1, B2, B3 respectively. The pour points were 6, 6, 90C for B1, B2, B3 respectively. The copperstrip corrosions were 1a, 1a, 1a for B1, B2, B3 respectively. The water content were 0.05, trace, 0.2 % v/v for B1, B2, B3, while B2 only contained trace amount of water. The gas chromatography analysis showed that the biodiesel produced contains ethyl palmitate, ethyl linoleate and ethyl laurate with retention time of 17.0, 18.6 , 18.7 minutes respectively. Based on the analyses, it can be concluded that biodiesel from used cooking oil and molase fulfils the Indonesian National Standard (SNI) -04-7182-2006, except for its viscosity.
PERBANDINGAN ANALISIS KROMATOGRAFI CAIR KINERJA TINGGI ELUASI GRADIEN DENGAN ISOKRATIK PADA PENENTUAN VITAMIN B1, B2 DAN B6 DALAM SEDIAAN SIRUP MULTIVITAMIN SECARA SIMULTAN Ni Luh Kasih Ariani; Ni Made Suaniti; James Sibarani
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 3 No 2 (2015)
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Vitamin B terutama B1 (Tiamin), B2 (Riboflavin), dan B6 (Piridoksin) sering terkandung dalam sirup multivitamin sehingga diperlukan analisis untuk mendeteksi secara simultan dalam campuran. Tujuan penelitian ini adalah membandingkan analisis vitamin B1, B2, dan B6 dalam sirup multivitamin secara simultan dengan kromatografi cair kinerja tinggi eluasi gradien dan isokratik, menggunakan kolom C18, panjang 15 cm, dan dengan pelarut campuran metanol: air : asam asetat glasial (10:90:1). Fase gerak adalah campuran natrium heksan sulfonat 5 mM dalam asam asetat glasial 0,5% dengan metanol yang dicampur secara gradien. Kondisi optimum metode gradien diperoleh pada laju alir 2,0 mL/menit, panjang gelombang 280 nm dengan waktu retensi 3,441 menit untuk piridoksin; 4,985 menit untuk riboflavin dan 7,393 menit untuk tiamin dengan resolusi 2,272 antara riboflavin dan piridoksin. Hasil uji presisi riboflavin dan piridoksin menggunakan metode isokratik (campuran natrium heksan sulfonat 5 mM dengan metanol dengan perbandingan 70 : 30) masing-masing dengan RSD adalah 1,377 dan 1,376 sedangkan metode gradien adalah 0,693 dan 0,825. Uji linearitas ketiga vitamin menggunakan dua metode isokratik dan gradien memenuhi persyaratan dengan R2 = 0,999. Kata kunci : Vitamin B, sirup multivitamin, kromatografi cair kinerja tinggi ABSTRACT: The aim of this research is to compare the simultaneous analytical results of B1 (Tiamin), B2 (Riboflavin), and B6 (Piridoxin) in multivitamin syrup between gradient and isocratic methods using high performance liquid chromatography (HPLC). The separation was performed on 15 cm length of C18 column and a mixture of methanol, water and glacial acetate acid with ratio of 10:90:1 was used as solvent. The eluent was a mixture of methanol and 5 mM sodium hexane sulfonate in 0.5% glacial acetate acid and gradually mixed using 2 different pumps. The optimal analytical conditions for gradient method were found to be 2,0 mL/min of flow rate and 280 nm of wavelength. On this gradient method, the vitamins were completely separated with retention times of 3.441 minutes, 4.985 minutes, and 7.393 minutes for piridoxin, riboflavin and tiamin respectively. Meanwhile, isocratic method (mixture of 5 mM sodium hexane sulfonate with metanol of 70 : 30) on the same conditions can only separate riboflavin and piridoxin. The RSD values for riboflavin and piridoxin were 1.377% and 1.376% respectively on isocratic methods and 0.693% and 0.825% respectively on gradient method. The linearity of both methods have fulfilled the requirement of R2 values that are higher than 0.999 for all vitamins. Keywords: B Vitamins, Multivitamin Syrup, High Performance Liquid Chromatography
IDENTIFIKASI DAN UJI TOKSISITAS EKSTRAK ETANOL SPONS Hyrtios erecta TERHADAP LARVA UDANG Artemia salina L. Rr. Anisa Hernindya; Made Dira Swantara; Ni Made Suaniti
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 2 No 1 (2014)
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Spons merupakan biota laut paling dominan dalam filum Porifera yang memiliki potensi biologis sebagai antikanker. Telah dilakukan identifikasi dan uji toksisitas pada ekstrak etanol Spons H. erecta menggunakan metode Brine Shrimp Lethality Test (BSLT) dengan bioindikator larva udang Artemia salina Leach. Tujuan penelitian ini adalah untuk mengetahui tingkat toksisitas ekstrak etanol Spons H. erecta sebagai antikanker. Partisi dari 10,8 gram ekstrak etanol menggunakan n-heksan, kloroform, dan air kemudian diuapkan menghasilkan ekstrak n-heksan sebanyak 3,13 gram, ekstrak kloroform sebanyak 1,63 gram, dan ekstrak air sebanyak 9,25 gram. Hasil uji toksisitas menunjukkan ekstrak n-heksan memiliki toksisitas paling tinggi dengan nilai LC50 316,22 ppm. Selanjutnya  dilakukan pemisahan dan pemurnian dengan kromatografi  kolom menggunakan eluen n-heksan: kloroform (2:8) sehingga menghasilkan empat fraksi yaitu FA, FB, FC, dan FD. Uji toksisitas pada semua fraksi menunjukkan bahwa fraksi C (FC) adalah yang paling toksik dengan LC50 50,11 ppm dan berdasarkan uji fitokimia diduga merupakan gabungan senyawa alkaloid, steroid dan polifeniol. Kata  kunci:  Spons Hyrtios erecta, uji toksisitas, Artemia  salina  Leach.           ABSTRACT: Sponges are the most dominant marine life in the phylum Porifera which have biological activities as anticancer. Identification and the toxicity test of ethanol extract of H. erecta sponges using Brine Shrimp Lethality Test ( BSLT ) with bio-indicators of Artemia salina Leach has been conducted. The purpose of this study was to determine the level of toxicity of the ethanol extract of H. erecta sponges as anticancer. Partition of 10,8 grams of ethanol extract using n-hexane, chloroform, and water followed by evaporation leaved n-hexane extracts, chloroform extract, and water extract of 3,13 grams, 1,63 grams, and 9,25 grams, respectively. The results of toxicity tests showed that n-hexane extract has the highest toxicity with LC50 value of 316,22 ppm . The n-hexane extract were then separated  by column chromatography  using  n-hexane: chloroform (2:8) as eluent  and  4  fractions  (FA, FB, FC, and FD) were obtained. The toxicity tests of all the fractions showed that fraction C (FC) was the most toxic with LC50 50,11 ppm. Based on the phytochemical tests the active compounds were suspected to be a combination of alkaloid, steroid and polyphenols.Keywords: H. Erecta sponge, toxicity test, Artemia  salina  Leach.
OPTIMASI DETEKSI SENYAWA AB FUBINACA DAN 5-FLUORO ADB DALAM SAMPEL GANJA SINTETIK MENGGUNAKAN GAS CHROMATOGRAPHY-MASS SPECTROMETRY (GC-MS) Dewi Yuliana; Ni Made Suaniti; James Sibarani
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 6 No 1 (2018): Volume 6, Nomor 1, 2018
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Optimasi deteksi senyawa AB-Fubinaca dan 5-Fluoro ADB telah dilakukan menggunakan instrumen GC-MS. Tujuan dari optimasi ini adalah untuk mendapatkan pelarut yang paling cocok untuk mengekstraksi dan untuk mempersingkat waktu analisis dari kedua senyawa tersebut. Adapun pelarut yang digunakan dalam ekstraksi adalah aseton dan metanol. Sedangkan optimasi waktu analisis dicapai dengan memvariasikan laju alir gas pembawa, suhu injeksi, dan suhu kolom terprogram. Hasil pemilihan pelarut menunjukkan bahwa pelarut yang cocok untuk proses ekstraksi senyawa AB-Fubinaca adalah aseton sedangkan untuk senyawa 5-Fluoro ADB adalah metanol. Efisiensi waktu analisis senyawa AB- Fubinaca dan 5-Fluoro ADB yang diekstrak dengan aseton dan metanol masing-masing adalah 75% dan 63%, dengan kondisi suhu injeksi, laju alir dan suhu kolom terprogram berturut-turut adalah 2900C, 1,5 ml/menit, dan suhu kolom terprogram III yang dimulai dengan suhu awal 800C dan peningkatan 300C/menit ke 2900C. Hasil penelitian ini menunjukkan bahwa peningkatan suhu kolom, suhu injeksi dan laju alir berbanding lurus dengan efisiensi waktu analisis dan waktu analisis sampel dapat dipersingkat dari 30 menit menjadi 10 menit. Kata kunci: AB-Fubinaca, 5-Fluoro ADB, Ganja Sintetik, GC-MS ABSTRACT: Optimization of compound detection of AB-Fubinaca and 5-Fluoro ADB has been done using GC-MS instrument. The purposes these optimization were to obtain the most suitable solvent for extracting both of the substances and to reduce the analysis time of the two compounds. The solvents used in the extraction were acetone and methanol. The optimization of analysis time was achieved by varying the flow rate of the carrier gas, the injection temperature, and column programmed temperature. The solvent selection results show that the most suitable solvent for the extraction process of AB-Fubinaca is acetone while for the 5-Fluoro ADB is methanol. The time efficiency analyzes of AB-Fubinaca and 5-Fluoro ADB compounds extracted with acetone and methanol respectively were 75% and 63%, which were obtained on injection temperature, flow rate and column programmed temperature of 2900C, 1.5 ml/minute and column programmed temperature III which is started with initial temperature of 800C and increased of 300C/minute to 2900C. The results of this study show that the increasing of injection temperature was directly proportional to the time efficiency of the analysis. The time for analysing the sampel was shorten from 30 minutes to 10 minutes.
VARIASI KONSENTRASI DAN pH TERHADAP KEMAMPUAN KITOSAN DALAM MENGADSORPSI METILEN BIRU Turmuzi Tammi; Ni Made Suaniti; Manuntun Manurung
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 1 Januari 2013
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

The effects of chitosan concentration and pH on adsorption properties of the chitosan extracted from shrimp shell waste to adsorb methylen blue had been studied. Chitosan was made by two steps namely the isolation of chitin and the chitin deacetylation. The chitin isolation itself was conducted by three sequence procedures which were deproteination, demineralization, and depigmentation. The deacetylation was conducted by heating the chitin obtained in the concentrated solution of NaOH 50% (w/v) at 90oC for 120 minutes. The degree of the deacetylation was 54,65%. The maximum concentration of 0,2% (w/v) at pH 7 showed the highest adsorption (%D) of 50 mL  10 ppm methylene blue of 95,044%. 
ANALISIS FENOL DALAM URIN PEKERJA SALAH SATU STASIUN PENGISIAN BAHAN BAKAR UMUM DI KOTA DENPASAR Abdul Rahim; Ni Made Suaniti; Wiwik Susanah Rita
Jurnal Kimia (Journal of Chemistry) Vol. 9, no. 1 Januari 2015
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Phenol is a compound produced by the metabolism of benzene contained in the fuel. The purpose of this study was to determine the content of phenol in the urine of workers at a Public Gas Station in Denpasar. The method used in this analysis was gas chromatography – FID (GC-FID). Urine was taken 3 times with an interval of 7 days from 3 workers. Control was taken from a non-gas station worker. Standard solutions used were mixtures of benzene and phenol with concentration of 1.25, 2.50, 5, and 10 ppm. Phenol calibration curve equation was y = 2.94x ??+ 0.23 with a correlation coefficient (r) = 0.9997. The concentration of phenol of samples varied ranging from 0.51 ppm to 1.38 ppm, while the phenol content in gasoline alone was 0.66 ppm. Phenol levels in the urines were still under normal value which is 25 ppm, while the level of benzene exposure was still under the standard concentration of 10 ppm.
ANALISIS ASAM AMINO PENSTIMULASI SEKRESI INSULIN DALAM BIJI KECIPIR, BIJI ASAM, DAN BIJI KELOR DENGAN HPLC Dita Rizkiyanti; Ni Made Suaniti; Ketut Ratnayani
Jurnal Kimia (Journal of Chemistry) Vol. 10, No. 1 Januari 2016
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Seeds are a source of high protein when compared with other parts of the plant. Compared to soy bean, the use of winged bean seeds, tamarind seeds, moringa seeds as protein sources are still very limited. Protein composed of several amino acids bond together to form a polypeptide. Some amino acids have been investigated to act as stimulating insulin secretion, namely, arginine, alanine, phenylalanine, isoleucine, and lysine. The aim of this study was to determine the potential content of amino acids stimulating the secretion of insulin in winged bean seeds, tamarind seeds, and moringa seeds. Based on the total content of amino acids in each seeds, the results showed that moringa seeds have the highest levels of total amino acids stimulating insulin secretion (16.4%), followed by winged bean seeds (16.2%), and tamarind seeds (12.1%). But if seen by the levels of each amino acid, the winged bean seeds on average had the highest amino acid content. The highest levels of arginine, alanine, phenylalanine, isoleucine, and leucine were found in winged bean seeds, while only one specific amino acid i.e. lysine was found to be the highest level on moringa seeds. It can be concluded that the most potential seeds as a source of amino acids stimulating insulin was the winged bean seeds, that will be useful in the prevention or treatment of diabetes mellitus.
ANALISIS FATTY ACID ETHYL ESTER DENGAN INFRA RED DALAM DARAH TIKUS WISTAR SETELAH MINUM ALKOHOL SECARA AKUT Ni Made Suaniti
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 1 Januari 2011
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Fatty acid ethyl esters (FAEE) are the result of biochemical reactions in the body after drinking alcohol acutely. In general, alcoholic drinks contain ethanol, which can be analyzed chemically as ethanol and its metabolites. Metabolite of ethanol are the result of ethanol oxidation reaction and the reaction of ethanol with endogenous compaounds in the body. One of the metabolites of ethanol is an ester compound resulted from the reation of ethanol with fatty acids. This study aims to prove the existence of FAEE functional group as one of biochemical markers in acute alcohol consumers. Two groups of wistar rats were given distilled water (control group) and 20% alcohol (treaed group) every day for 1 week. Biochemical markers analyzed are FAEE. This research was conducted in two phases: the first phase, is the treatment of rats with acute alcohol. The second phase, analysis of chemical compounds: FAEE with Infra Red Spectrophotometer. Wistar rat blood samples taken 6 and 24 hours after drinking alcohol acutely were analyzed qualitatively. Functional Groups indicating the presence of FAEE are C-H (3600-2500 cm-1), the ketone group (C = O) appears at 1870-1540 cm-1, stretching vibration of CO or C-C (= O)-O at 1190-1140 cm- 1.
EFEK PENAMBAHAN ANTIOKSIDAN EKSTRAK METANOL KULIT BUAH MANGGIS (Garcinia mangostana L.) TERHADAP PERUBAHAN KADAR FFA, BILANGAN ASAM, DAN BILANGAN PEROKSIDA BIODIESEL Ni Made Suaniti; Manuntun - Manurung; Ni Made Meryana Utari
Jurnal Kimia (Journal of Chemistry) Vol. 11. No. 1 Januari 2017
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Biodiesel merupakan salah satu bahan bakar alternatif yang beredar di pasaran. Agar stabil lebih lama maka kedalamnya ditambahkan antioksidan. Penambahan ekstrak metanol kulit buah (EMKB) manggis (Garcinia mangostana L.) sebagai antioksidan alami, diharapkan menjadi suatu pilihan. Penelitian ini bertujuan untuk mengetahui perubahan %FFA, BA, BP dari biodiesel akibat penambahan ekstrak metanol kulit buah manggis ke dalam biodiesel. Untuk maksud tersebut, biodiesel ditambahkan ekstrak metanol kulit buah manggis dengan variasi konsentrasi sebesar 0,01; 0,02; dan 0,03% b/v masing-masing sebagai A1; A2; dan A3. Biodiesel tersebut diuji nilai kadar FFA, bilangan asam, dan bilangan peroksida setiap minggu selama 6 minggu. Dari berbagai konsentrasi tersebut, biodiesel A1 merupakan konsentrasi terbaik dalam menghambat reaksi oksidasi biodiesel, dengan nilai kadar FFA, bilangan asam, dan bilangan peroksida paling rendah berturut-turut sebesar (0,24±0)%; (0,5252±0) mg KOH/g; dan (34,7511±0) meq peroksida/1000 g. Nilai bilangan asam tersebut telah sesuai dengan SNI 7182:2012.
Co-Authors A. A. B. Putra A. A. Bawa Putra A. A. I. S. J. Dewi A. A. S. D. Saraswati Abdul Rahim Agung Ari Chandra Wibawa Anak Agung Gede Sudewa Djelantik Anak Agung Istri Agung Mayun Laksmiwati Anak Agung Sagung Desy Dwi Martayani Martayani Ariati, N. K. Ayu Kasmita Dewi Darma Yanti, N. M. D. Dewa Ayu Ika Pramitha Dewi Yuliana Dita Rizkiyanti Dwi Anggraeni Putri Suandi H. Purnomo Hendra Wijaksana I D. G. Putra Prabawa I G. Mustika I G.N.O. Suputra I Gede Budiartawan I GEDE PUTU WIRAWAN I Gusti Ayu Kunti Sri Panca Dewi I Gusti Komang Dwijana I Ketut Budiarta I Ketut Suastika I Ketut Suastika I Made Agus Gelgel Wirasuta I Made Dira Swantara I Made Sudarsana I Nengah Suarnadwipa I Nengah Suweden I Nengah Wirajana I NYOMAN MANTIK ASTAWA I W. Wiratama I Wayan Bandem Adnyana I Wayan Suarsa I. A. R. Astiti Asih I. E. Radiati I. Mahmudi I.P. Widiarta Ida Ayu Okarini Ida Bagus Putra Manuaba Ika Paramitha, Dewa Ayu Iryanti Eka Suprihatin James Sibarani Ketut Gede Dharma Putra Ketut Ratnayani Khairul Mahfuz Komang Ari Gunapria Darmapatni M. M. Manurung M. Manurung M. Sucipta M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Made Ayu Hita Pretiwi Suryadhi Made Suarda Mahardika Aprilia Iflahah Mahardika Aprilia Iflahah Manuntun Manurung Maryana, Himayari Nufus Mirah Surya Dewi, Ni Putu Pande N. G. Indriyaningsih N. P. Widya Astuti N. P. Widya Astuti N. W. Bogoriani Nadya Hartasiwi Ni G. A. M. Dwi Adhi Suastuti Ni Komang Ariati Ni Luh Kasih Ariani Ni Luh Rustini Ni Made Meryana Utari Ni Made Puspawati Ni Made Rai Suarni Ni Made Sukma Sanjiwani Ni Nyoman Nadia Angela Kusuma P. Ni Pt. Pande Mirah Surya Dewi Ni Putu Diantariani Ni Putu Widya Astuti Ni Wayan Sri Sukmarianti Noviyanti, Ni Putu O. Ratnayani O. Ratnayani Oka Ratnayani Oka Ratnayani Oktavia, Fadilla Raisyah Anjani Riyadi, T. Rr. Anisa Hernindya S. A. Sari Sagung Ngurah Mayuni Setianingsih, Ni Luh Putu Putri Turmuzi Tammi Wahyu Dwijani Sulihingtyas Wira Adi Capayanti WIWIK SUSANAH RITA