scholarly journals Preliminary Study of Microelements, Phenolics as well as Antioxidant Activity in Local, Homemade Wines from North-East Greece

Foods ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1607
Author(s):  
Adriana Skendi ◽  
Maria Papageorgiou ◽  
Stefanos Stefanou
Keyword(s):  
Antioxidant Activity ◽  
Toxic Metals ◽  
Inductively Coupled Plasma ◽  
Principal Component ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Total Phenolic ◽  
Inductively Coupled ◽  
North East ◽  
Plasma Optical Emission Spectrometry

The present study is aimed to analyze the composition of microelements in wines prepared by amateur winemakers in Drama region (recognized as Protected Geographical Indication (PGI)), especially the toxic ones, as well as the phenolic content and antioxidant activity of these wines since moderate wine consumption may contribute to health benefits to the consumers. A total of twenty-four wines, comprising sixteen red and eight white, were tested. The micro and macroelements were determined with ICP-OES (Inductively coupled plasma-optical emission spectrometry). Chromatic characteristics of wines and total phenolic and flavonoid compounds as well as their antioxidant activity with three different assays were determined spectrophotometrically. The amateur’s wines showed levels of contaminants with toxic metals less than the limits set from the International Organization of Vine and Wine (OIV). Moreover, toxic metals concentrations were comparable to those of European wines. The Principal Component Analysis discriminated wines into white and red and further distinguished the red wine into two groups depending on the Total Flavonoid content, antioxidant activity and color intensity. The moderate consumption of amateur wines can be recommended since their consumption is not harmful to the health, and they contain high amount of phenolics and flavonoids comparable or even higher to that of commercial wines.

scholarly journals Caracterização estratigráfica dos depósitos sedimentares cenozoicos da Bacia do Ribeirão Sardinha, porção sul do Quadrilátero Ferrífero (MG), e estabelecimento de background geoquímico

2018 ◽  
Vol 18 (2) ◽  
pp. 129-148
Author(s):  
Rayme Loureiro dos Santos ◽  
Adivane Terezinha Costa
Keyword(s):  
Principal Component Analysis ◽  
Inductively Coupled Plasma ◽  
Principal Component ◽  
Optical Emission ◽  
Optical Emission Spectrometry ◽  
Emission Spectrometry ◽  
Icp Oes ◽  
Inductively Coupled ◽  
Quadrilátero Ferrífero ◽  
Plasma Optical Emission Spectrometry

Este trabalho apresenta os resultados de levantamentos sedimentológicos e geoquímicos realizados na Bacia do Ribeirão Sardinha, porção sul do Quadrilátero Ferrífero, estado de Minas Gerais, Brasil. O estudo fundamentou-se na caracterização faciológica de perfis verticais de depósitos de barrancos e terraços e em dados mineralógicos e químicos relacionados às fácies identificadas e aos sedimentos atuais do afluente principal (barras e canal). A amostragem das fácies reconhecidas e dos sedimentos atuais totalizaram 54 amostras. A mineralogia foi obtida via difração de raios X e os dados geoquímicos, através da espectrometria de emissão óptica por plasma acoplado indutivamente (inductively coupled plasma optical emission spectrometry — ICP-OES). Os dados químicos foram submetidos a análises de componentes principais (principal component analysis — PCA) e utilizados para a aplicação da técnica Tukey inner fence (TIF), que possibilitou o estabelecimento de valores de background dos seguintes elementos: Fe, Mn, Al, Ba, Cu, Zn, As, Ni, Cr e Co. Os resultados de PCA indicam uma forte relação entre o Mn e os sedimentos atuais do Ribeirão Sardinha. Outros padrões geoquímicos foram realçados pelas altas concentrações de Fe e Mn, relacionadas aos sedimentos arenosos e cascalhosos de barras e canal, e pelos elevados teores de Al e K vinculados aos sedimentos finos constituintes dos depósitos de planícies de inundação e de lagoas de cheia. Os cálculos dos valores de background mostram um valor de referência elevado para o As (32,89 mg/kg) e anomalias referentes às altas concentrações de Al, Cu, Zn, Ni e Cr, sugerindo fontes geogênicas. Por outro lado, anomalias referentes aos valores elevados de Co, Ba e Mn estão relacionadas a fontes antropogênicas. 

scholarly journals Geochemistry of Fe3+ in the hydrothermal dickite from Jedlina Zdroj (Lower Silesia, Poland)

2009 ◽  
Vol 74 (12) ◽  
pp. 1477-1489 ◽  
Author(s):  
Pavle Premovic ◽  
Justyna Ciesielczuk ◽  
Bratislav Todorovic ◽  
Dragan Djordjevic ◽  
Nenad Krstic
Keyword(s):  
Inductively Coupled Plasma ◽  
Principal Component ◽  
Optical Emission ◽  
Total Sample ◽  
Oxidation Potential ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Spin Resonance ◽  
Plasma Optical Emission Spectrometry ◽  
Lower Silesia

Geochemical analysis for Fe was made on a representative sample of dickite-rich hydrothermal clay from Jedlina Zdroj. The mineralogy of the sample is comparatively simple, dickite being the principal component (>95 wt. % of the total sample), with lesser amounts of goethite and barite. Geochemical fractionation and inductively coupled plasma-optical emission spectrometry indicated that most of the Fe (ca. 97 wt. % of the total metal) resides in the dickite. Electron spin resonance showed that some of the Fe in the dickite structure is in the form of Fe3+. A substantial proportion of these ions (as well as Fe) in the dickite matrix were probably contained in the original hydrothermal dickite-forming solution. From the geochemistry of Fe3+, it was deduced that the oxidation potential (Eh) and pH of the solution during the formation of dickite from the Jedlina Zdroj were approximately 0.45-0.95 V (highly oxygenated) and 0-4 (highly acidic), respectively.

Sign in / Sign up

Export Citation Format

Share Document