Agustín Acquaviva

• PhD
• Research Associate at National University of La Plata

The rapid growth in the use of two dimensional liquid chromatography (2D-LC) applied to the analysis of moderately to highly complex mixtures, has been fueled by continuous improvements in performance and robustness of the instrument components, as well as the ease-of-use of software necessary for controlling the 2D-LC instrument hardware, and anal...

A simple, sensitive and reproducible solid-phase extraction method using plastic cartridges containing a monolithic sorbent (m-SPE), coupled to reverse phase liquid chromatography analysis, aiming to determine fifteen polycyclic aromatic hydrocarbons in surface water samples, was developed. The sorbent was easily prepared through a thermal polymeri...

This work demonstrates the potential of two-dimensional liquid chromatography (2D-LC) to increase the resolution capacity of multiple pesticides in a single analysis of samples that contain both chiral and achiral compounds. The setup is based on the combination of a chiral column in the first dimension and an achiral column in the second dimension...

Analytical method validation is the first step for quantitative analysis, and both validation and quantitation are usual and fundamental tasks in analytical work; hence it is extremely important to perform them in the most rigorous way to obtain quality results. Then, in this sense, are we able to answer the question: is standard addition calibrati...

Reaction flow (RF) chromatography is a powerful and efficient approach that utilizes conventional high-performance liquid chromatography (HPLC)–ultraviolet (UV)–visible detection. This technique exploits a novel column end-fitting and an extra HPLC pump that delivers a reagent specific for selective detection, in particular the antioxidant profilin...

A novel and simple analytical methodology including solid-phase extraction using a monolithic sorbent (m-SPE), coupled to reverse phase liquid chromatography analysis, to determine seven non-steroidal anti-inflammatory drugs in surface water samples, is proposed. The sorbent was easily prepared though a thermal polymerization reaction by using a mi...

An established ferric reducing antioxidant power (FRAP) assay was optimised by preparation of the derivatisation reagent in 300 mM formate instead of 300 mM acetate conditions, resulting in increased sensitivity signal to noise responses by up to five to ten times. The quantitative protocol for selective detection of antioxidants via a HPLC post co...

Most HPLC enantiomer separations are performed with columns packed with a chiral stationary phase (CSP) operated with an achiral mobile phase. The intrinsically limited chemical selectivity of most CSPs to the simultaneous resolution of several pairs of enantiomers means that complex mixtures of diverse pairs of enantiomers cannot be resolved in a...

This study is based upon a recently established method for quantification of the antioxidant capacity of natural samples via a HPLC separation and a hyphenated selective detection (post-column derivatization with cupric reducing antioxidant capacity reagent) technique. This protocol demonstrated the main improvements to transform the quantitative p...

This study highlights the capability to conduct a post column derivatisation (PCD) process with a narrow bore, low volume column. A reaction flow (RF) HPLC column (30 mm × 2.1 mm internal diameter (i.d.), 3 μm particle diameter) enabled the selective detection of phenols for both a simple standard mixture and a complex sample represented by green t...

This communication is the first to demonstrate the high throughput power of a 30 mm in length reaction flow (RF) column to conduct a targeted analysis of phenolics in a complex sample matrix (tea) utilising post-column derivatisation (PCD). Sensitivity, speed and efficiency could be tuned via the selection of the RF column separation flow rate. RF-...

In drug design experimental characterization of acidic groups in candidate molecules is one of the more important steps prior to the in-vivo studies. Potentiometry combined with Yasuda-Shedlovsky extrapolation is one of the more important strategy to study drug candidates with low solubility in water, although, it requires a large number of sequenc...

The study of two commonly used post-column derivatisation (PCD) approaches for the selective detection of “bioactive” compounds in natural products were investigated – the ‘phenolic’ assay as the name suggests was responsive to phenolic compounds, while the Ferric Reducing Antioxidant Power (FRAP) assay was responsive to antioxidants. Detailed asse...

A novel approach for the analysis of phenolics in tea was developed using multiplexed simultaneous detection. This is the first study employing a short reaction flow (RF) chromatography column (length 50 mm) for the analysis of phenolics in complex samples (not a standard mixture of compounds). RF separation efficiency was high as the detectors are...

This is the first study to employ a reaction flow (RF) HPLC column of a short 5 cm length to identify antioxidants in a variety of complex samples represented by tea, utilising simultaneous multiplexed detection techniques. The detection responses included: underivatised UV at 280 nm, underivatised fluorescence detection (FLD) and a post column der...

We propose to apply the extrapolative internal standard calibration method (EISM) for quantitative analysis of citrulline and other metabolically related amino acids in plasma by pre-column derivatization, liquid chromatographic and UV detection. Whenever derivatization is required and an amino acid-free matrix is nonexistent, the analytical challe...

We describe the development of a high-performance liquid chromatography (HPLC) method for the determination of citrulline and other amino acids relevant to intestinal diseases. The amino acids were derivatized with 9 -fluorenylmethylchloroformate (FMOC-Cl) and their derivatives were separated on two different columns, a core shell column (Halo C18)...

The synchronization of injection valve operation and gradient elution in capillary liquid chromatography (cHPLC) is studied. Focus is placed on the cHPLC systems which rely on the splitting of a primary flow to provide the much smaller secondary flow required at the injection device and analytical column. Owing to the tiny secondary flow rates, syn...

This study focused on an investigation into the experimental quantities inherent in the determination of partition coefficients from gas-liquid chromatographic measurements through the use of capillary columns. We prepared several squalane - (2,6,10,15,19,23-hexamethyltetracosane) - containing columns with very precisely known phase ratios and dete...

A new automated and rapid potentiometric method for determining the effect of organic-solvent composition on pK(a) has been developed. It is based on the measurements of pH values of buffer solutions of variable solvent compositions using a combined glass electrode. Additions of small volumes of one precisely thermostated solution into another, bot...