scholarly journals Sintesis dan Karakterisasi Molecularly Imprinted Polymer Untuk Kloramfenikol Menggunakan Polimerisasi Fasa Ruah

2018 ◽  
Vol 3 (1) ◽  
pp. 40-46
Author(s):  
Rosita Dwi Chrisnandari
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Molecularly Imprinted Polymer ◽  
Fourier Transform Infrared ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Ft Ir ◽  
Cross Linker

Kloramfenikol adalah antibiotik yang memiliki aktivitas untuk melawan bakteri gram positif dan gram negatif yang pemakaiannya dibatasi dan diawasi oleh lembaga pemerintahan karena memiliki efek samping yang membahayakan kesehatan manusia dan lingkungan. Metode analisis kloramfenikol yang digunakan umumnya kurang selektif dan kurang spesifik terhadap kloramfenikol. Pada penelitian ini dikembangkan teknik preparasi sampel berbasis molecularly imprinted polymer (MIP) yang dapat digunakan sebagai adsorben selektif dan spesifik terhadap kloramfenikol. MIP disintesis menggunakan kloramfenikol sebagai template, asam metakrilat (MAA) sebagai monomer, etilen glikol dimetakrilat (EGDMA) sebagai cross-linker dan kloroform sebagai porogen dengan perbandingan mol rasio template:monomer:cross-linker sebesar 1:4:20 secara polimerisasi fasa ruah pada suhu 70 ºC selama 11 jam. Elusi template dilakukan melalui ekstraksi pelarut menggunakan metanol:asam asetat 9:1 (v/v). Non-imprinted polymer (NIP) dan polimer kontrol juga disintesis sebagai pembanding. Hasil polimerisasi dikarakterisasi menggunakan fourier transform infrared spectroscopy (FT-IR) dan adsorpsi-desorpsi N2. Spektra FT-IR menunjukkan gugus fungsi spesifik kloramfenikol pada MIP tidak tampak bila dibandingkan dengan spektra NIP. Luas permukaan MIP diketahui sebesar 106,609 m2/g dan 41,860 m2/g untuk polimer kontrol. Hal ini membuktikan bahwa MIP memiliki sisi pengenal yang lebih banyak dan spesifik dibandingkan dengan polimer kontrol. MIP hasil sintesis dapat digunakan untuk meningkatkan selektivitas metode analisis kloramfenikol secara kromatografi.Kata kunci: Kloramfenikol, Molecularly Imprinted Polymer (MIP), Polimerisasi Fasa Ruah

scholarly journals Revealing electrolyte oxidation via carbonate dehydrogenation on Ni-based oxides in Li-ion batteries by in situ Fourier transform infrared spectroscopy

2020 ◽  
Vol 13 (1) ◽  
pp. 183-199 ◽  
Author(s):  
Yirui Zhang ◽  
Yu Katayama ◽  
Ryoichi Tatara ◽  
Livia Giordano ◽  
Yang Yu ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Li Ion Batteries ◽  
Ft Ir ◽  
Li Ion ◽  
Electrolyte Oxidation

Carbonate oxidation via dehydrogenation on LiNi0.8Co0.1Mn0.1O2 at voltages as low as 3.8 VLi was revealed by in situ FT-IR measurements.

Identification of Large Isotope Anomalies in Quartz by Infrared Spectroscopy

2019 ◽  
Vol 73 (7) ◽  
pp. 767-773
Author(s):  
Ryan C. Ogliore ◽  
Cosette Dwyer ◽  
Michael J. Krawczynski ◽  
Hélène Couvy ◽  
Max Eisele ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Isotope Composition ◽  
Fourier Transform Infrared ◽  
Spectroscopic Technique ◽  
Far Field ◽  
Ft Ir ◽  
Ir Spectroscopic ◽  
Quartz Grains

We report an infrared (IR) spectroscopic technique to detect quartz grains with large isotope anomalies. We synthesized isotopically doped quartz and used Fourier transform infrared spectroscopy (FT-IR) in two different instruments: a traditional far-field instrument and a neaSpec nanoFT-IR, to quantify the shift in the peak of the Si–O stretch near 780 cm−1 as a function of isotope composition, and the uncertainty in this shift. From these measurements, we estimated the minimum detectable isotope anomaly using FT-IR. The described technique can be used to nondestructively detect very small (30 nm) presolar grains. In particular, supernova grains, which can have very large isotope anomalies, are detectable by this method.

scholarly journals Application of Fourier Transform Infrared Spectroscopy for the Oxidation and Peroxide Value Evaluation in Virgin Walnut Oil

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Pengjuan Liang ◽  
Chaoyin Chen ◽  
Shenglan Zhao ◽  
Feng Ge ◽  
Diqiu Liu ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Peroxide Value ◽  
Edible Oils ◽  
Fourier Transform Infrared ◽  
Calibration Model ◽  
Walnut Oil ◽  
Value Evaluation ◽  
Ft Ir

Recent developments in Fourier transform infrared spectroscopy-partial least squares (FTIR-PLSs) extend the application of this strategy to the field of the edible oils and fats research. In this work, FT-IR spectroscopy was used as an effective analytical tool to determine the peroxide value of virgin walnut oil (VWO) samples undergone during heating. The spectra were recorded from a film of pure oil between two disks of KBr for each sample at frequency regions of 4000–650 cm−1. Changes in the values of the frequency of most of the bands of the spectra were observed and used to build the calibration model. PLS model correlates the actual and FT-IR estimated value of peroxide value with a correlation coefficient of 0.99, and the root mean square error of the calibration (RMSEC) value is 0.4838. The methodology has potential as a fast and accurate way for the quantification of peroxide value of the edible oils.

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