A flow-based procedure exploiting the lab-in-syringe approach for the determination of ester content in biodiesel and diesel/biodiesel blends

Soares, Samara; Melchert, Wanessa R.; Rocha, Fábio R.P.

doi:10.1016/j.talanta.2017.06.053

Cited by 14 publications

(2 citation statements)

References 19 publications

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“…In two works from Koscielniak's group, in-syringe mixing was integrated into FT analyzers for flexible preparation of sample solutions for iron determination studying chemometric tools for reduction of matrix effects [28,29]. Finally, the LIS-automated determination of ester content in biodiesel was reported where ethanol was used for in-syringe preparation of a homogenous phase of the hydrophobic sample and aqueous reagents to accomplish a chromogenic reaction [30].…”

Section: Modes Of Operation and Automated Methodologiesmentioning

confidence: 99%

The Automation Technique Lab-In-Syringe: A Practical Guide

Horstkotte

Solich

2020

Molecules

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About eight years ago, a new automation approach and flow technique called “Lab-In-Syringe” was proposed. It was derived from previous flow techniques, all based on handling reagent and sample solutions in a flow manifold. To date Lab-In-Syringe has evidently gained the interest of researchers in many countries, with new modifications, operation modes, and technical improvements still popping up. It has proven to be a versatile tool for the automation of sample preparation, particularly, liquid-phase microextraction approaches. This article aims to assist newcomers to this technique in system planning and setup by overviewing the different options for configurations, limitations, and feasible operations. This includes syringe orientation, in-syringe stirring modes, in-syringe detection, additional inlets, and addable features. The authors give also a chronological overview of technical milestones and a critical explanation on the potentials and shortcomings of this technique, calculations of characteristics, and tips and tricks on method development. Moreover, a comprehensive overview of the different operation modes of Lab-In-Syringe automated sample pretreatment is given focusing on the technical aspects and challenges of the related operations. We further deal with possibilities on how to fabricate required or useful system components, in particular by 3D printing technology, with over 20 different elements exemplarily shown. Finally, a short discussion on shortcomings and required improvements is given.

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Section: Modes Of Operation and Automated Methodologiesmentioning

confidence: 99%

The Automation Technique Lab-In-Syringe: A Practical Guide

Horstkotte

Solich

2020

Molecules

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“…A variety of chromatographic and spectroscopic techniques are used to assess the quality of biodiesel, including thin layer chromatography, , gas chromatography with flame ionization detector (GC-FID), − gas chromatography–mass spectrometry, − headspace-based gas chromatography, gas chromatography-differential mobility spectrometry with cluster analysis, high-performance liquid chromatography, − gel permeation chromatography, − supercritical fluid chromatography, near-infrared spectroscopy, , Fourier-transform spectroscopy, , Raman spectroscopy, 13 C NMR, H NMR, − and sequential/flow injection analysis (SIA/FIA). , …”

Section: Introductionmentioning

confidence: 99%

Analysis and Quantitation of Fatty Acid Methyl Esters in Biodiesel by High-Performance Liquid Chromatography

et al. 2018

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The aim of this study was to compare two methods for determining the fatty acid methyl ester content of biodiesel by applying high-performance liquid chromatography (HPLC-UV) and the reference method based on gas chromatography (GC). The samples of biodiesel were also analyzed by 1H NMR. External standards were used for the quantification of fatty acid methyl esters by HPLC-UV. The analytical curves of the methyl oleate, methyl linoleate, and methyl linolenate standards showed good linearity (coefficient of determination ≥ 0.995). Cochran’s test was used to assess the homoscedasticity of the analytical curves. The limits of detection and quantitation were found: 0.0018% mass and 0.0054% mass for methyl oleate, 0.0002% mass and 0.0007% mass for methyl linoleate, and 0.0001% mass and 0.0004% mass for methyl linolenate. The accuracy of the HPLC-UV method was assessed by determining recovery (%), which resulted on values between 81.7 ± 0.2 and 110.9 ± 0.1. Precision was assessed by determining repeatability (%), which was found to be between 0.2 and 1.3. The proposed HPLC-UV method proved efficient in determining the fatty acid methyl ester content of biodiesel and the paired t-test showed it to correlate well with the reference method (GC).

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