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Multivariate optimization by exploratory analysis applied to the determination of microelements in fruit juice by inductively coupled plasma optical emission spectrometry
Abstract A method for the direct determination (without sample pre-digestion) of microelements in fruit juice by inductively coupled plasma optical emission spectrometry has been developed. TheExpand
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Degradation of caffeine by photo-Fenton process: optimization of treatment conditions using experimental design.
The degradation of caffeine in different kind of effluents, via photo-Fenton process, was investigated in lab-scale and in a solar pilot plant. The treatment conditions (caffeine, Fe(2+) and H(2)O(2)Expand
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Liquid–Liquid Equilibrium Data for Reactional Systems of Ethanolysis at 298.3 K
The objective of this work was to determine liquid–liquid equilibrium data at (298.3 ± 0.2) K for systems of interest in biodiesel production, such systems being composed of vegetable oils +Expand
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Electrospray ionization mass spectrometry fingerprinting of Brazilian artisan cachaça aged in different wood casks.
We have investigated the capability of direct infusion electrospray ionization mass spectrometry in the negative ion mode, ESI(-)-MS, to differentiate representative samples of artisan cachaça, aExpand
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Extra virgin (EV) and ordinary (ON) olive oils: distinction and detection of adulteration (EV with ON) as determined by direct infusion electrospray ionization mass spectrometry and chemometric
Extra virgin (EV), the finest and most expensive among all the olive oil grades, is often adulterated by the cheapest and lowest quality ordinary (ON) olive oil. A new methodology is described hereinExpand
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Fast Quantitative and Qualitative Monitoring of Mafurra Biodiesel Content Using Fourier Transform Mid-Infrared Spectroscopy, Chemometric Tools, and Variable Selection
This paper presents a feasible methodology to quantify and classify the mafurra methyl biodiesel content in a diesel blend using Fourier transform mid-infrared spectroscopy (FT-MIR) in combinationExpand
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Quantification of Inorganic Constituents in Brazilian Human Milk by ICP OES
A fast procedure to determine essential and toxic metals in Brazilian human milk by ICP OES is proposed. Mature and colostrum human milk samples were mineralized using closed-pressurized andExpand
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Quantification of Ethanol in Biodiesels Using Mid-Infrared Spectroscopy and Multivariate Calibration
In this work, we developed a method to quantify ethanol in ethyl soybean biodiesel and ethyl biodiesel from waste frying oil using mid-infrared spectroscopy in association with multivariateExpand
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Homogeneous catalysis of soybean oil transesterification via methylic and ethylic routes: Multivariate comparison
An experiment to establish the best reaction conditions for the transesterification of soybean oil is described. We conducted the ethylic and methylic routes using two different protocols, andExpand
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Application of Factorial Design and Response Surface Methods to Optimize Ethyl Biodiesel Production from Corn Oil
In this study were investigated, by applying fractional factorial and central composite, and the variables of the reaction of transesterification of corn oil using ethyl alcohol: (i) reaction time,Expand
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