Special Issue "Polyphenols and Foods: Authentication, Analysis and Characterization. Antioxidant and Antimicrobial Activity"

A special issue of Foods (ISSN 2304-8158). This special issue belongs to the section "Food Function and Nutrition".

Deadline for manuscript submissions: closed (15 August 2018)

Special Issue Editors

Guest Editor
Prof. Dr. Charalampos Proestos

Laboratory of Food Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece
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Interests: food chemistry; food analysis; food antioxidants; foodomics; food technology
Guest Editor
Dr. Panagiotis Zoumpoulakis

National Hellenic Research Foundation; 48 Vas. Constantinou Ave.11635 Athens; Greece
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Phone: 00302107273854
Guest Editor
Prof. Dr. Vassilia Sinanoglou

Technological Educational Institute of Athens(TEIATH); Department of Food Technology; Athens, Greece
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Phone: 302105385553

Special Issue Information

Dear Colleagues,

Secondary metabolites, including polyphenols, alkaloids and terpenoids, provide food products with pigmentation, health benefits, and sensory attributes. These compounds may lend disease protection to botanicals and supplements, and, specifically in the case of polyphenols, enhance the quality of foods and beverages, such as tea, wine, beer, etc.  Polyphenols significance for the human diet and antimicrobial activity has been recently established. In this special issue extraction and isolation of polyphenols by conventional and high energy techniques such as ultrasound and microwave assisted will be discussed. Additionally, current trends in mass spectrometry (multiple quadrupole (LC-MSn), time of flight (QTOF) LTQ-Orpitrap), metabolomic analyses by QTOF, LC-LTQ-Orbitrap-MS. LTQ-Orbitrap, with two-stage mass analysis (MS/MS) and multi-stage mass analysis (MSn), GC-MS after silylation and NMR spectroscopy (i.e., 2D Diffusion Ordered Spectroscopy) for the identification and chemical characterization of polyphenols will be discussed. Metabolomics have been increasingly applied during the last five years to food and plant matrices and have been correlated mainly to fraud and authenticity issues.  Last but not least, the antioxidant and antimicrobial (antifungal) activity of naturally occurring polyphenols will be presented.

Prof. Dr. Proestos Charalampos
Dr. Panagiotis Zoumpoulakis
Prof. Dr. Vassilia Sinanoglou
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Foods is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 550 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • polyphenols
  • food authenticity
  • analysis
  • antioxidants
  • antimicrobial activity

Published Papers (2 papers)

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Research

Open AccessArticle Using Sensory Evaluation to Determine the Highest Acceptable Concentration of Mango Seed Extract as Antibacterial and Antioxidant Agent in Fresh-Cut Mango
Received: 6 July 2018 / Revised: 19 July 2018 / Accepted: 25 July 2018 / Published: 30 July 2018
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Abstract
Plant extracts have the potential to be used as food additives; however, their use have been limited by causing undesirable changes in the sensory attributes of foods. We characterized the mango seed extract as a preserving agent for fresh-cut mangoes. We established the
[...] Read more.
Plant extracts have the potential to be used as food additives; however, their use have been limited by causing undesirable changes in the sensory attributes of foods. We characterized the mango seed extract as a preserving agent for fresh-cut mangoes. We established the maximum concentration of extract that, while increasing the antioxidant activity, and limiting microbial contamination of the fruit, did not negatively affect fruit sensory acceptability. The extract contained 277.4 g gallic acid equivalent (GAE)/kg dw (dry weight) of polyphenols and 143.7 g quercetin equivalent (QE)/kg dw of flavonoids. Antioxidant capacity values were 2034.1 and 4205.7 μmol Trolox equivalent (TE)/g against 2,2-diphenyl-1-picryl-hydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radicals, respectively. Chromatographic analysis revealed the presence of gallic and chlorogenic acids. The extract (16 g/L) inhibited the growth of Escherichia coli, Salmonella Typhimurium, Staphylococcus aureus and Listeria monocytogenes. The highest concentration with sensory acceptability was 6.25 g/L. At such concentration, the extract preserved fresh-cut fruits, increasing polyphenols (0.427 g GAE/kg fw (fresh weight)), flavonoid content (0.234 g QE/kg fw) and antioxidant activity (DPPH = 2.814 and ABTS = 0.551 mol TE/kg fw). It also reduced inoculated bacteria (range: 5.50 × 103 to 1.44 × 105 colony forming units (CFU)/g). These results showed the importance of considering consumer acceptability to determine the effective concentration of plant extracts as additives. Full article
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Open AccessArticle HPLC-ED Analysis of Phenolic Compounds in Three Bosnian Crataegus Species
Received: 20 March 2018 / Revised: 18 April 2018 / Accepted: 19 April 2018 / Published: 24 April 2018
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Abstract
The aim of this work was the qualitative and quantitative determination of selected phenolic compounds in three Crataegus species grown in Bosnia. Crataegus plants are consumed for medicinal purposes and as foodstuff in the form of canned fruit, jam, jelly, tea, and wine.
[...] Read more.
The aim of this work was the qualitative and quantitative determination of selected phenolic compounds in three Crataegus species grown in Bosnia. Crataegus plants are consumed for medicinal purposes and as foodstuff in the form of canned fruit, jam, jelly, tea, and wine. Two samples of plant material, dry leaves with flowers, and berries of three Crataegus species—Crataegus rhipidophylla Gand., Crataegus x subsphaericea Gand., and Crataegus x macrocarpa Hegetschw.—were analyzed. Twelve ethanolic extracts were isolated from the selected plant material using Soxhlet and ultrasound extraction, respectively. Soxhlet extraction proved to be more effective than ultrasound extraction. A simple and sensitive method, high-performance liquid chromatography with electrochemical detection, HPLC-ED, was used for the simultaneous determination of phenolic acids and flavonoids in Crataegus species. The content of gallic acid in the extracts ranged from 0.001 to 0.082 mg/g dry weight (DW), chlorogenic acid from 0.19 to 8.70 mg/g DW, and rutin from 0.03 to 13.49 mg/g DW. Two flavonoids, vitexin and hyperoside, commonly found in chemotaxonomic investigations of Crataegus species, were not detected in the examined extracts. In general, leaves with flowers samples are richer in gallic acid and rutin, whereas the berries samples are richer in chlorogenic acid. Distinct similarities were found in the relative distribution of gallic acid among the three species. Extracts of C. x macrocarpa had the highest content of all detected compounds, while significant differences were found in rutin content, depending on the plant organ. To the best of our knowledge, this is the first study reporting content of phenolic compounds in Crataegus rhipidophylla Gand., Crataegus x subsphaericea, and Crataegus x macrocarpa from Bosnia. Full article
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