Eduardo Rossini - Academia.edu (original) (raw)

Papers by Eduardo Rossini

Journal of the Brazilian Chemical Society, 2022

A green methodology was developed for the extraction and determination of lauryl ether sulfate in... more A green methodology was developed for the extraction and determination of lauryl ether sulfate in raw materials and commercial liquid soap and shower gel samples. The method avoids the use of organic solvents, offering a simple, cheap, and safe analysis. The methodology is based on the sorption of an ionic pair consisting of a cationic dye and an anionic surfactant onto polyurethane foam. The experimental variables were optimized by chemometry to obtain the conditions that maximized extraction of the ionic pair. Digital imaging and spectrophotometry were used for quantification in the linear concentration range from 10.0 to 100 mg L-1. The limits of detection and quantification were, respectively, 2.71 and 9.28 mg L-1 for digital imaging, and 1.74 and 5.83 mg L-1 for spectrophotometry. The methods showed good results when applied to commercial samples, with recoveries in the range 96.8-103%.

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2021

h i g h l i g h t s Easy and non-invasive sample collection using saliva. A low-cost sample treat... more h i g h l i g h t s Easy and non-invasive sample collection using saliva. A low-cost sample treatment using a cotton-paper-syringe filtration system. LODs as low as 10 À6 mol L À1 and 10 À7 mol L À1 were achieved. Simple, fast, low cost and highly sensitive method to analyze glucose and lactate.

Food Control, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2019

This paper describes the development and application of a paper-based analytical device (μPAD) fo... more This paper describes the development and application of a paper-based analytical device (μPAD) for the determination of hydrogen peroxide, an important adulterant in milk. The method employs the reaction between hydrogen peroxide and guaiacol, catalyzed by peroxidase, producing a red product, which is then quantified by digital imaging. Experimental design methodology was used to optimize the experimental conditions. The linear concentration range was from 12.5 × 10 −4 to 150 × 10 −4 mol L −1 , resulting in the regression equation A B = 0.02466 (±0.00192) + 17.053 (±0.750) C, with an excellent correlation coefficient (r = 0.986). The relative standard deviations obtained were 1.1 and 1.3% (intra-day), and 4.8 and 2.9% (inter-day), for 25.0 × 10 −4 and 100 × 10 −4 mol L −1 of hydrogen peroxide, respectively. The limits of detection and quantification were 3.54 × 10 −4 and 11.8 × 10 −4 mol L −1 , respectively, with standard deviation of the blank of 0.002012. The proposed method was successfully applied for the determination of peroxide in milk samples, with recoveries between 92.2 and 109%. The proposed device constitutes a valuable analytical tool for the identification of hydrogen peroxide adulteration and offers advantages including low cost, simplicity, portability, and no (or minimal) requirement for sample pretreatment.

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2018

A simple, fast, low-cost, portable, and eco-friendly method using a spot test on a paper platform... more A simple, fast, low-cost, portable, and eco-friendly method using a spot test on a paper platform, together with diffuse reflectance spectroscopy, was developed and validated for the quantification of aluminum hydrochloride, a potential neurotoxic agent, in antiperspirant samples. The determination of aluminum hydrochloride was performed at a wavelength of 615 nm, by measuring consumption of the purple colorimetric reagent Alizarin S, due to reaction with aluminum. The linear range was from 10.0 to 125.0 mg L −1 and could be described by the equation: A R = 0.4479 − 0.002543 C Al (R = 0.999). The limits of detection (LOD) and quantification (LOQ) were 3.06 and 10.2 mg L −1 , respectively. The method was specific, accurate, and repeatable, with relative standard deviation (RSD) b5.0%. The recovery was between 92.2 and 103.4%. The method was successfully used for the determination of aluminum hydrochloride in commercial antiperspirant samples, revealing concentrations below the maximum permitted by current legislation.

Microchemical Journal, 2019

Development and application of a new, simple, inexpensive, and eco-friendly method is presented f... more Development and application of a new, simple, inexpensive, and eco-friendly method is presented for the quantification of bumetanide in human urine samples for the detection of doping in sports. The method involves the use of a paper platform and digital image detection and is based on the reaction between bumetanide, pdimethylaminocinnamaldehyde (p-DAC), and HCl in a methanolic medium, yielding a colored compound in a delimited area on a qualitative filter paper. The concentrations of p-DAC and HCl were optimized by a chemometric experimental design. After the addition of the reagents to the paper, digital images were obtained by scanning in a multifunctional printer and analyzed using the RGB pattern. The linear bumetanide concentration range was 6.90 × 10 −5-1.37 × 10 −3 mol L −1 with R 2 = 0.993 and the limits of detection (LOD) and quantification (LOQ) were 3.60 × 10 −4 and 1.09 × 10 −4 mol L −1 , respectively. A SPE clean-up step for the samples were required to eliminate the interference of urinary urea. The recoveries obtained varied from 94% to 105%, indicating the absence of significant matrix effects or interferences in urine samples after clean-up step. The proposed method was successfully applied to the analysis of bumetanide in human urine samples.

Analytica chimica acta, Jan 2, 2018

In this paper, we describe a validated paper-based microfluidic analytical device for the simulta... more In this paper, we describe a validated paper-based microfluidic analytical device for the simultaneous quantification of two important biomarkers of renal function in urine. This paper platform provides an inexpensive, simple, and easy to use colorimetric method for the quantification of creatinine (CRN) and uric acid (UA) in urine samples. The microfluidic paper-based analytical device (μPAD) consists of a main channel with three identical arms, each containing a circular testing zone and a circular uptake zone. Creatinine detection is based on the Jaffé reaction, in which CRN reacts with picrate to form an orange-red product. Uric acid quantification is based on the reduction of Feto Feby UA, which is detected in a colorimetric reaction using 1,10-phenanthroline. Under optimum conditions, obtained through chemometrics, the concentrations of the analytes showed good linear correlations with the effective intensities, and the method presented satisfactory repeatability. The limits o...

Microchemical Journal, 2017

Cachaça is the popular name of sugarcane liquor obtained from fermented sugarcane mash broth. Thi... more Cachaça is the popular name of sugarcane liquor obtained from fermented sugarcane mash broth. This is one of the most popular alcoholic beverages in Brazil and is gaining ground in the global market. One of the quality parameters established by Brazilian law is the sum of the concentrations of furfural and hydroxymethylfurfural, two compounds that give the beverage an unpleasant taste and have mutagenic potential. These two substances are usually determined by chromatographic techniques that employ toxic organic solvents that can be damaging to the health of the operator and to the environment. This paper describes the development of a new methodology to determine furfural and hydroxymethylfurfural in sugarcane liquor using a diffuse reflectance technique coupled with limited-area spot-testing on a paper platform. The new method presented LOQ values of 0.74 mg L −1 for furfural and 1.27 mg L −1 for hydroxymethylfurfural. Recoveries in the ranges 89.5-108% (furfural) and 96.3-106% (hydroxymethylfurfural) indicated that there was no significant influence of the matrix in determination of the analytes. The method was applied using eleven sugarcane liquor samples from different locations in Brazil.

Anal. Methods, 2016

A green analytical methodology was developed employing diffuse reflectance spectroscopy for the a... more A green analytical methodology was developed employing diffuse reflectance spectroscopy for the analysis of amaranth in foodstuffs without clean-up steps.

Analytical Sciences, 2016

One of the quality indicators for honey is 5-(hydroxymethyl)-2-furaldehyde (HMF), which is formed... more One of the quality indicators for honey is 5-(hydroxymethyl)-2-furaldehyde (HMF), which is formed during the heating or aging of honey. The International Honey Commission recommends three methods for the determination of HMF in honey: the Winkler method, the White method, and determination by HPLC. The Winkler method uses the carcinogenic substance p-toluidine, which is not in accordance with the principles of Green Chemistry. The present work describes the determination of HMF in honey by flow injection analysis (FIA) using a modified Winkler method, replacing p-toluidine with p-aminobenzoic acid. The linear range was 1.00 to 40.0 mg L-1 , the limit of detection (LOD) was 0.43 mg L-1 , and the limit of quantification (LOQ) was 1.32 mg L-1. The method is an efficient and environmentally friendly technique for the analysis of HMF in honey. Keywords 5-(Hydroxymethyl)-2-furaldehyde (HMF), flow injection analysis, p-aminobenzoic acid, honey

Anal. Methods, 2015

A green analytical methodology was developed employing ultrasound-assisted extraction to analyze ... more A green analytical methodology was developed employing ultrasound-assisted extraction to analyze sodium in pet foods without the need for corrosive acids.

Scientia Agricola, 2008

Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) has become a key pest in the sugarcane (Sacc... more Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) has become a key pest in the sugarcane (Saccharum officinarum) fields of center-south Brazil. Although some control technologies have shown to be efficient, the damage promoted by this spittlebug species and its interaction with sugarcane are poorly characterized. At high infestation levels the symptoms are similar to those of severe water restriction. This work was conducted to determine whether the stress promoted by spittlebug infestation can be measured in terms of free proline accumulation. The water restriction tolerance of two sugarcane genotypes was also compared. Two experiments were set up in a greenhouse and arranged in a completely randomized design in a 2 x 2 x 4 factorial, with two cultivars (SP80-1816 and RB72454), two stress levels (control and ten nymphs per plant or 50% water restriction), and four sampling dates. The water deficit caused by spittlebug nymphs sucking xylem sap does not result in proline accumulat...

Scientia Agricola, 2005

The increased rate of sugarcane harvest without previous burn has provided a very favorable envir... more The increased rate of sugarcane harvest without previous burn has provided a very favorable environment to the froghopper Mahanarva fimbriolata (Stal, 1854), with high moisture and low temperature variation. Few works have studied the response of sugarcane to this pest, so little is known about resistant cultivars. Plant phenolics are widely studied compounds because of their known antiherbivore effect. This research aims to determine if the attack of M. fimbriolata nymphs stimulates the accumulation of total phenolics in sugarcane. The experiment was carried out in greenhouse and arranged in completely randomized design, in a 3 X 2 X 4 factorial with three replications. Second instar nymphs of M. fimbriolata were infested at the following rates: control, 2-4 and 4-8 nymphs per pot (first-second infestations, respectively). Pots were covered with nylon net and monitored daily to isolate the effect of leaf sucking adults. Leaf and root samples were collected and kept frozen in liquid...