scholarly journals Study of the phenolic composition of Vernaccia di San Gimignano vine

2019 ◽  
Vol 13 ◽  
pp. 04019
Author(s):  
Franco Giannetti ◽  
Anna Maria Epifani ◽  
Marco Leprini ◽  
Giordano Martini
Keyword(s):  
Aging Process ◽  
Hplc Analysis ◽  
White Wine ◽  
Hydroxycinnamic Acids ◽  
Phenolic Composition ◽  
Research Protocol ◽  
Caftaric Acid ◽  
Predominant Form ◽  
Historical Tradition ◽  
Set Up

Vernaccia di San Gimignano is a Tuscan white wine, with a great historical tradition, produced mostly from the homonymous grapevine. One of the peculiarities of the vine, apart from producing fruity and sapid young wines, is the ability to generate structured wines, suitable for the aging process of “riserva” type. For a better understanding of the Vernaccia di San Gimignano characteristics, a research protocol has been set up. It specifically concerns the phenolic composition of the grapes observed by HPLC analysis. The hydroxycinnamic acids, the flavanols and the flavonols of the skins, the flavanols of the seeds and the hydroxycinnamic acids of the juice have been determined. The trans-caftaric acid is the predominant form in the juice (70-120 mg/L) and in the skins (5-12 mg/Kg) where there are higher values of quercetin (4-20 mg/Kg) and procyanidins (18-35 mg/Kg). Catechins (30-80 mg/Kg) prevail in the seeds.

Caffeoyl Quinic and Tartaric Acids and Flavonoids from Lapsana communis L. subsp. communis (Asteraceae)

1998 ◽  
Vol 53 (11-12) ◽  
pp. 1090-1092 ◽  
Author(s):  
D. Fontanel ◽  
C. Galtier ◽  
C. Viel ◽  
A. Gueiffier
Keyword(s):  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Hydroxycinnamic Acids ◽  
First Report ◽  
Chicoric Acid ◽  
Caftaric Acid ◽  
Aerial Parts ◽  
Tartaric Acids ◽  
Dicaffeoylquinic Acid

Abstract Six hydroxycinnamic acids : caffeic acid, chlorogenic acid, 3,5-O-dicaffeoylquinic acid 2-O-caffeoyltartaric acid (caftaric acid) and 2,3-O-dicaffeoyltartaric acid (chicoric acid) have been isolated from Lapsana communis L. subsp. communis aerial parts. Among flavonoids, only isoquercitrin, luteolin and luteolin-7-O-β-glucuronide were identified. Except for chlorogenic acid, these com­ pounds represent the first report in Lapsana communis. Chicoric acid is the major phenylpropanoic constituent in this plant.

Phenolic Composition of Vinegars over an Accelerated Aging Process Using Different Wood Species (Acacia, Cherry, Chestnut, and Oak): Effect of Wood Toasting

2014 ◽  
Vol 62 (19) ◽  
pp. 4369-4376 ◽  
Author(s):  
Ana B. Cerezo ◽  
M. Antonia Álvarez-Fernández ◽  
Ruth Hornedo-Ortega ◽  
Ana M. Troncoso ◽  
M. Carmen García-Parrilla
Keyword(s):  
Wood Species ◽  
Aging Process ◽  
Accelerated Aging ◽  
Phenolic Composition

scholarly journals FRESHNESS GRADING OF SHELL EGGS USING A DIELECTRIC TECHNIQUE AND ARTIFICIAL NEURAL NETWORK METHOD

2008 ◽  
Vol 39 (3) ◽  
pp. 49
Author(s):  
Angelo Fabbri ◽  
Luigi Ragni ◽  
Annachiara Berardinelli ◽  
Chiara Cevoli ◽  
Alessandro Giunchi ◽  
...  
Keyword(s):  
Cell Size ◽  
Aging Process ◽  
Sine Wave ◽  
Dielectric Parameters ◽  
Shell Eggs ◽  
Network Method ◽  
Commission Regulation ◽  
Artificial Neural Network Method ◽  
Artificial Neural ◽  
Set Up

The increase in size of the air cell is related to the aging process of the eggs. According to the European Commission Regulation, eggs must be classified in A (air cell size higher than 4 mm), and A “extra” (air cell size lower than 4 mm) categories by candling inspection. This technique is unable to non-destructively assess the size of the air cell during egg grading. The present research studies the possibility to nondestructively grading shell eggs from dielectric parameters obtained by means of a sine wave RF oscillator, a parallel inductance and capacitance circuit. In particular, dielectric parameters and egg dimensional characteristics were used to set up multi-layer (MLP) artificial neural networks. Using MLP with two hidden layers, eggs can be correctly graded in A and A “extra” categories (test validation) within a mean performance close to 90%.

scholarly journals Phenolic Composition, Antioxidant and Anticancer Potentials of Extracts from Rosa banksiae Ait. Flowers

Molecules ◽  
2020 ◽  
Vol 25 (13) ◽  
pp. 3068 ◽  
Author(s):  
Chen Zeng ◽  
Siyuan Luo ◽  
Shiling Feng ◽  
Tao Chen ◽  
Lijun Zhou ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Antioxidant Capacity ◽  
Pharmacological Activity ◽  
Hplc Analysis ◽  
Folk Medicine ◽  
Ornamental Plant ◽  
Natural Antioxidant ◽  
Phenolic Composition ◽  
Extraction Technology ◽  
Research Papers

Rosa banksiae Ait. (R. banksiae) is a traditional Chinese folk medicine and an ornamental plant. Most previous studies have focused on cultivation and utilization while there are few research papers on the pharmacological activity of R. banksiae. This study aimed to get a better understanding of R. banksiae by extracting polyphenols with fractionated extraction technology. The results showed that ethyl acetate phase (EAP) contained the most polyphenols, while water phase (WP) had the least. HPLC analysis indicated that rutin and luteolin-4′-O-glucoside existed in the EAP and butanol phase (BP), but quercetin was only detected in the EAP. Six phenolic compositions were not detected in WB. The antioxidant and anti-tumor abilities of the EAP and BP were excellent. The results revealed that R. banksiae possessed a great antioxidant capacity and was rich in polyphenols, thus indicating R. banksiae was suitable for being a natural antioxidant and an abundant source of polyphenols.

scholarly journals The Main Ecological Characteristics of a Species Introduced to Martinique in a Dynamic of Invasion: Funtumia Elastica (Preuss) Stapf (Apocynaceae)

2019 ◽  
Vol 8 (2) ◽  
pp. 1
Author(s):  
Philippe Joseph ◽  
Kévine Baillard ◽  
Jean-Philippe Claude ◽  
Yelji Abati ◽  
Séverine Ely-Marius ◽  
...  
Keyword(s):  
Introduced Species ◽  
Global Scale ◽  
Field Observations ◽  
Floristic Diversity ◽  
Research Protocol ◽  
Tropical Africa ◽  
Functional Organisation ◽  
The Caribbean ◽  
Set Up ◽  
Ecological Dominance

Introduced species that become invasive alter the structural and functional organisation of the ecosystems of the host territories because of the absence of certain ecological locks. On a global scale, the consequences are very damaging for many key development-related sectors. Martinique, like all the islands of the Caribbean, is not immune to this phenomenon of biological invasion currently linked to greater globalisation. Among the potentially invasive introduced species and in the light of field observations, Funtumia elastica, native to tropical Africa, appears to have functional traits that could make it a species that is dangerous for local floristic diversity. Since no study exists in Martinique on the ecology of this taxon, we have set up a research protocol based on floristic surveys in various stations marked out by transects subdivided into quadrats. Using the data obtained, it has been possible to highlight the main features of the ecology of this species in terms of biodemography, ecological dominance, mesological affinities and of belonging to the different stages of vegetal succession.

Comparison of the phenolic composition of fruit juices by single step gradient HPLC analysis of multiple components versus multiple chromatographic runs optimised for individual families

2000 ◽  
Vol 32 (6) ◽  
pp. 549-559 ◽  
Author(s):  
Paul D. Bremner ◽  
Claire J. Blacklock ◽  
George Paganga ◽  
William Mullen ◽  
Catherine A. Rice-Evans ◽  
...  
Keyword(s):  
Hplc Analysis ◽  
Single Step ◽  
Fruit Juices ◽  
Phenolic Composition ◽  
Multiple Components ◽  
Gradient Hplc

scholarly journals A Novel HPLC-Based Method to Investigate on RNA after Fixation

2020 ◽  
Vol 21 (20) ◽  
pp. 7540
Author(s):  
Paolo Fattorini ◽  
Cristina Forzato ◽  
Domenico Tierno ◽  
Eleonora De Martino ◽  
Eros Azzalini ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Nucleic Acid ◽  
High Performance ◽  
Hplc Analysis ◽  
Enzymatic Digestion ◽  
Clinical Samples ◽  
Iso Standard ◽  
Set Up ◽  
Rna Preservation

RNA isolated from fixed and paraffin-embedded tissues is widely used in biomedical research and molecular pathology for diagnosis. In the present study, we have set-up a method based on high performance liquid chromatography (HPLC) to investigate the effects of different fixatives on RNA. By the application of the presented method, which is based on the Nuclease S1 enzymatic digestion of RNA extracts followed by a HPLC analysis, it is possible to quantify the unmodified nucleotide monophosphates (NMPs) in the mixture and recognize their hydroxymethyl derivatives as well as other un-canonical RNA moieties. The results obtained from a set of mouse livers fixed/embedded with different protocols as well from a set of clinical samples aged 0 to 30 years-old show that alcohol-based fixatives do not induce chemical modification of the nucleic acid under ISO standard recommendations and confirm that pre-analytical conditions play a major role in RNA preservation.

The effect of time and storage conditions on the phenolic composition and colour of white wine

2006 ◽  
Vol 39 (2) ◽  
pp. 220-229 ◽  
Author(s):  
Ángeles F. Recamales ◽  
Ana Sayago ◽  
M. Lourdes González-Miret ◽  
Dolores Hernanz
Keyword(s):  
Storage Conditions ◽  
White Wine ◽  
Phenolic Composition ◽  
And Storage
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