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All Journal Journal of Aceh Physics Society Jurnal Natural JURNAL REKAYASA KIMIA & LINGKUNGAN
Lelifajri Lelifajri
Chemistry Department, Faculty Of Mathematics And Natural Sciences, Universitas Syiah Kuala, Banda Aceh, Indonesia 23111
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Immunology & microbiology Neuroscience Physics

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Instrumentation of realtime monitoring system towards level of C6H12O6, C2H5OH, CO2, temperature in tapai fermentation process Yuliani Yuliani; Khairi Suhud; Dedi Satria; Lelifajri Lelifajri; Binawati Ginting; Yuliani Aisyah; Fauzi Fauzi; Muhammad Syukri Surbakti
Journal of Aceh Physics Society Volume 10, Number 3, July 2021
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v10i3.19161

Abstract

Abstrak. Tapai merupakan makanan yang dihasilkan dari hasil fermentasi, salah satunya berbahan dasar dari ubi kayu. Fermentasi oleh ragi (saccharomyces serevesiae) menjadikan perubahan kimia pada substrat karena aktivitas enzim yang dihasilkan mikroorganisme. Parameter-parameter yang ditinjau adalah perubahan kadar C6H12O6, gas C2H5OH, gas CO2, suhu dan kelembapan dalam proses fermentasi melalui sistem pengukuran elektronik berbasis mikrokontroller Arduino Uno. Rangkaian sensor mengandung modul input yaitu sensor FC-28, sensor MQ-3, sensor MG-811, sensor DHT-11 dan modul pemroses mikrokontroler ATMEGA238 dengan sistem Arduino Uno dan pada komponen output menggunakan layar LCD 2X16. Kadar karakterisasi berdasarkan keluaran ADC (Analog to Digital Converter) untuk C6H12O6 adalah 535 untuk tapai ubi kayu. Kadar C6H12O6 akan terus menurun dari hari pertama sampai hari keempat yang mencapai 175 pada tapai ubi kayu. Diperoleh nilai akhir kadar gas C2H5OH yaitu 582. Kadar gas CO2 406 untuk tapai ubi. Selanjutnya nilai suhu 31oC untuk tapai ubi dengan nilai kelembaban 95RH. Waktu panen tapai dapat dipersingkat yaitu dari 7 hari menjadi 4 hari. Penelitian ini diharapkan dapat memberikan informasi pemakaian yang dapat dipergunakan untuk tampilan komposisi tapai secara komersial atau untuk tujuan kesehatan. Abstract. Tapai is food produced from fermentation, one of which is made from cassava. Fermentation by yeast (Saccharomyces serevesiae) causes chemical changes in the substrate due to the activity of enzymes produced by microorganisms. The parameters reviewed are changes in levels of C6H12O6, C2H5OH gas, CO2 gas, temperature and humidity in the fermentation process through an electronic measurement system based on the Arduino Uno microcontroller. The sensor circuit contains an input module, namely FC-28 sensor, MQ-3 sensor, MG-811 sensor, DHT-11 sensor and ATMEGA238 microcontroller processing module with the Arduino Uno system and the output component uses a 2X16 LCD screen. The grade based on the ADC (Analog to Digital Converter) output for the C6H12O6 is 535 for cassava tapai. Levels of C6H12O6 will continue to decline from the first day to the fourth day reaching 175 in cassava tapai. Obtained the final value of C2H5OH gas content is 582. CO2 gas content of 406 for cassava tapai. Furthermore, the temperature value of 31oC for cassava tapai with a humidity value of 95RH. The harvest time for tapai can be shortened from 7 days to 4 days. This research is expected to provide usage information that can be used to display tapai composition commercially or for health purposes. Keywords: fermentation, tapai, cassava, FC-28, MQ-3, MG-811, DHT11, Microcontroller.
PREPARATION OF CHITOSAN-CELLULOSE COMPOSITE BEADS USING CELLULOSE ISOLATED FROM SUGARCANE BAGASSE Rahmi Rahmi; Alfahmizar Alfahmizar; Lelifajri Lelifajri
Jurnal Natural Volume 19 Number 2, June 2019
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (445.479 KB) | DOI: 10.24815/jn.v19i2.12734

Abstract

Chitosan-cellulose composite beads had been prepared using cellulose isolated from sugarcane bagasse. Sugarcane bagasse was hydrolyzed with H2SO4 with various concentrations (30, 40, and 50%). Cellulose obtained was characterized using Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). FTIR analysis results inform the existence of typical functional groups of cellulose in the sample. XRD patterns show H2SO4 concentration on the hydrolysis process influence the crystallinity of cellulose. Cellulose was used as a filler in the preparation of chitosan-cellulose composite beads. The results show that cellulose decrease the crystallinity of chitosan. 
PREPARATION OF CHITOSAN-CELLULOSE COMPOSITE BEADS USING CELLULOSE ISOLATED FROM SUGARCANE BAGASSE Rahmi Rahmi; Alfahmizar Alfahmizar; Lelifajri Lelifajri
Jurnal Natural Volume 19 Number 2, June 2019
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v19i2.12734

Abstract

Chitosan-cellulose composite beads had been prepared using cellulose isolated from sugarcane bagasse. Sugarcane bagasse was hydrolyzed with H2SO4 with various concentrations (30, 40, and 50%). Cellulose obtained was characterized using Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). FTIR analysis results inform the existence of typical functional groups of cellulose in the sample. XRD patterns show H2SO4 concentration on the hydrolysis process influence the crystallinity of cellulose. Cellulose was used as a filler in the preparation of chitosan-cellulose composite beads. The results show that cellulose decrease the crystallinity of chitosan. 
Adsorpsi Ion Logam Cu(II) Menggunakan Lignin dari Limbah Serbuk Kayu Gergaji Lelifajri Lelifajri
Jurnal Rekayasa Kimia & Lingkungan Vol 7, No 3 (2010): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Adsorption of heavy metal ion Cu(II) onto modified lignin from sawdust waste have been presented. The ability of lignin from sawdust waste to adsorb the copper ion has been evaluated by varying adsorption time, pH of solution, and adsorption capacity. The concentration of copper ion was measured by atomic adsorption spectrometer. The result showed that the optimum condition of ion Cu(II) by lignin were achieved at adsorption time of 15 minutes, pH of solution of 6, and copper concentration of 20 mg/L with adsorption efficiency of 99,3 %. In this study, the maximum capacity of 15,43 mg/g and equilibrium constant of 754,96 were achieved.Keywords: adsorpsi, ion tembaga, lignin, limbah serbuk kayu gergaji
Analisis Logam Berat Pb dan Cd dalam Sampel Ikan dan Kerang secara Spektrofotometri Serapan Atom Supriatno Supriatno; Lelifajri Lelifajri
Jurnal Rekayasa Kimia & Lingkungan Vol 7, No 1 (2009): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

The analysis of heavy metals Pb and Cd concentrations in fish and oyster have been carried out by atomic absorption spectrophotometer (AAS) method. The wet digestion method was used for preparation sample prior to AAS detection. Sample was collected from three different location rivers at Lamnyong, Pantee Pirak and Lumbago. The result showed that the Pb and Cd concentration in fish and oyster at difference location were obtained not difference significantly. Pb and Cd contents in fish and oyster were found below lethal concentration. The AAS instrument was still valid to use as the instrument which is obtained of accuration of 0.65% and precise of 0,019 ppm still lower than threshold value of 1% and 0.04 ppm.Keywords: atomic absorbance spektrophootometry, fish, kerang, heavy metal
Co-Authors Alfahmizar Alfahmizar Binawati Ginting Dedi Satria Fauzi Fauzi KHAIRI SUHUD Rahmi Rahmi Supriatno Supriatno Surbakti, Muhammad Syukri Yuliani Aisyah Yuliani Yuliani