ATEI Thessaloniki

Thessaloníki, Greece

ATEI Thessaloniki

Thessaloníki, Greece
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Dimopoulou M.,ATEI Thessaloniki | Dimopoulou M.,Aristotle University of Thessaloniki | Tsivintzelis I.,Aristotle University of Thessaloniki | Ritzoulis C.,ATEI Thessaloniki | And 2 more authors.
RSC Advances | Year: 2016

This is a comprehensive characterization of the bulk and interface thermodynamics of a model macromolecular hydrocolloid of interest in food, cosmetics and pharmaceutics, namely okra mucilage. Inverse gas chromatography (IGC) has been used to probe the affinity of 20 different compounds at infinite dilution to the hydrocolloid. Extensive surface characterization was conducted at three temperatures (40, 50, 60°C) for the assessment of the surface energy, the free energy of adsorption, and the related enthalpic and entropic components. Okra extract matrix is shown to be Lewis amphoteric with predominantly basic character. Bulk thermodynamic parameters such as the Flory-Huggins interaction parameter, the weight fraction activity coefficient and the total and partial solubility parameters were determined at 90, 100, 110°C. The above can form a background for the interpretation of many aspects of the hydrocolloid's structural and functional behavior. © The Royal Society of Chemistry 2016.


Temenouga V.,ATEI Thessaloniki | Charitidis T.,ATEI Thessaloniki | Avgidou M.,ATEI Thessaloniki | Karayannakidis P.D.,ATEI Thessaloniki | And 5 more authors.
Food Hydrocolloids | Year: 2016

Maillard conjugates have been prepared in situ in okra mucilage from the existing populations of protein and polysaccharide. SEC-MALLS/UV and FTIR data suggest that an initial ensemble of polysaccharide and protein changes dramatically during heating at 100 °C for 6 h. While the raw extracts and the products of milder heat treatments are inefficient emulsifiers at neutral pH, the conjugates prepared from the above heat treatment are efficient emulsifiers for n-hexadecane-in-water emulsions, both in terms of initial average droplet size (d32) and the evolution of d32 and d43 over a week's stay at ambient conditions. The emulsifying ability of these products is superior to that of the more conventional Maillard products of the reaction between bovine serum albumin (BSA) and okra extract (experiments held in parallel). The emulsifying ability of the above materials is in complete agreement with the relevant measurements of the development of their interfacial tensions. The above suggest that the intrinsic components of natural extracts can lead to Maillard products of commercial interest, and form a solid basis for the possible exploitation of okra as an emulsifier, rather as a thickening agent. © 2015 Elsevier Ltd.


Dimopoulou M.,ATEI Thessaloniki | Dimopoulou M.,Aristotle University of Thessaloniki | Ritzoulis C.,ATEI Thessaloniki | Panayiotou C.,Aristotle University of Thessaloniki
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2014

An extensive surface characterization of okra hydrocolloid extract was conducted by means of inverse gas chromatography (IGC) at infinite dilution in three temperatures (40, 50, 60°C). The specific retention volume of 14 solvents, used as probes, was utilized for the assessment of the surface energy, the free energy of adsorption, as well as the relevant enthalpy and entropic component. The contribution to the surface energy of okra extract decreases with increasing temperature. Furthermore, surface characterization demonstrated that the okra extract matrix is Lewis amphoteric with predominantly basic character, as confirmed by the acidity and basicity constants K A and K B, respectively. The above were discussed in conjunction with X-ray diffractometry (XRD), size exclusion chromatography (SEC-MALLS/UV), and Fourier transform infra-red spectroscopy (FTIR) data. © 2014 Elsevier B.V.


Ritzoulis C.,ATEI Thessaloniki | Marini E.,ATEI Thessaloniki | Aslanidou A.,ATEI Thessaloniki | Georgiadis N.,ATEI Thessaloniki | And 5 more authors.
Food Hydrocolloids | Year: 2014

Hydrocolloids were extracted from the alcohol-insoluble solids of defatted, freeze-dried and ground quince seeds using temperature-controlled aqueous solutions buffered at pH 4, pH 6, pH 8 and pH 10 (processed in parallel, named QE4, QE6, QE8, QE10 respectively). The extracts and their principal macromolecular components were characterized in terms of polysaccharide and protein content; of their macromolecular polyelectrolyte distribution using gel electrophoresis (SDS-PAGE); of their generic chemical composition using Fourier-transform infra-red (FTIR) spectroscopy; and of their macromolecular populations distribution using size exclusion chromatography (SEC), and zeta potential measurement. Their capacity toward emulsification was studied at pH 3 and at pH 7 using light scattering for droplet distribution measurement and light microscopy for coalescence/flocculation control. QE4 and QE6 are good emulsifiers under conditions, while QE8 is a good emulsifier. Their emulsifying activity is correlated to their composition and the topology of their protein content. The emulsion stabilization capacity of QE4 and QE6 has been studied, the findings being correlated to the physico-chemical data. © 2014 Elsevier Ltd. All rights reserved.


Pavlou A.,Aristotle University of Thessaloniki | Ritzoulis C.,ATEI Thessaloniki | Filotheou A.,ATEI Thessaloniki | Panayiotou C.,Aristotle University of Thessaloniki
Waste and Biomass Valorization | Year: 2016

Hydrocolloids were extracted from the alcohol insoluble solids of defatted, finely crushed and freeze-dried winery waste of the Greek variety Xinomavro, using temperature-controlled aqueous solutions buffered at pH 5, pH 7 and pH 9. The extracts were characterized in terms of their macromolecular populations distribution using size exclusion chromatography; of their generic chemical composition and homogeneity using Fourier-transform infra-red (FTIR) spectroscopy and micro-FTIR mapping; of their polymeric particle distribution using dynamic light scattering; and of their charge using zeta potential measurements. These were compared with extracts obtained from fresh grape. The capacity of the extracts toward emulsification and emulsion stabilization was studied at neutral and acidic conditions (pH 7 and pH 3) using light diffraction for droplet distribution measurement and confocal microscopy. The extracts show potential for use as emulsifiers for acidic and neutral model emulsions. © 2016, Springer Science+Business Media Dordrecht.


Rousi Z.,ATEI Thessaloniki | Ritzoulis C.,ATEI Thessaloniki | Karayannakidis P.D.,ATEI Thessaloniki
Food Digestion | Year: 2014

A simple in vitro model of swallowing–progression from mouth to stomach was used in order to study the phase behavior/aggregation of BSA-stabilized model oil-in-water emulsions. The latter were first dispersed into simulated mouth fluid (SMF); then, their droplets were collected and redispersed into simulated gastric fluid (SGF), either in the presence or not of a model gastric mucin (pig gastric mucin, PGM). Emulsions flocculate weakly due to electrostatic effects upon exposure to simulated mouth fluid (SMF). Upon progression of the droplets to the stomach-like environment, enhancement of flocculation (but no coalescence) is observed. The presence of PGM in this environment reduces the extent of flocculation, suggesting that mucins could be acting as regulators of flocculation in the gastrointestinal tract. © 2014, Springer Science+Business Media New York.


Thomidis T.,ATEI Thessaloniki
Australasian Plant Pathology | Year: 2014

Fruit rots are possibly the most important diseases of pomegranates in Greece and worldwide. One of the aims of this study was to identify the pathogens causing pre- and postharvest fruit rots of pomegranate. The results showed that Pilidella granati was isolated from about 60 % of the preharvest rotted fruits without symptoms of cracking. Fungi of the genera Penicillium and Aspergillus niger predominated in rotted fruits with symptoms of cracking. In most of the postharvest rotted fruits, the symptoms developed from the calyx of the fruits. Botrytis cinerea was mainly isolated from these fruits (45 %). P. granati was isolated in 29 % of cases. These pathogens infected all parts of the fruits. Fungi of the genera Penicillium and Phoma sp. were isolated at a low percentage. Two or more of the above pathogens were simultaneously isolated from the same fruit in 15 % of cases. Propagules of the fungi P. granati, Penicillium spp., A. niger, B. cinerea, Alternaria spp., Cladosporium cladosporioides, and Aureobasidium pullulans were detected in the mummified fruit. In the calyx and mouldy stamens, most of the fungal colonies isolated were of the genus Penicillium. A number of colonies of the fungi A. alternata and C. cladosporioides and fewer colonies of the fungi A. niger, A. pullulans, B. cinerea and P. granati were also observed. Finally, the effectiveness of the fungicides tebuconazole, thiophanate methyl, azoxystrobin, cyproconazole and the mix pyrachlostrobin:boscalid to control postharvest fruit rots on pomegranate was investigated. No fungicide was effective in preharvest applications. In prestorage application, the fruits sprayed with tebuconazole or thiophanate methyl showed the least percentage of fruit rots of all treatments. Finally, no fungicide was effective to control fruit rots on pomegranates in poststorage applications. © 2014, Australasian Plant Pathology Society Inc.


Vesyropoulos N.,University of Macedonia | Georgiadis C.K.,University of Macedonia | Ilioudis C.,A.TEI Thessaloniki
ACM International Conference Proceeding Series | Year: 2012

Over the past few years Web Services (WS) have revolutionized the way loosely coupled distributed systems communicate and interact online. The aforementioned success has led to an abundance of available WS, which makes it harder for users and businesses to discover the appropriate services to be used as standalones or as part of a domain-specific service composition. Semantics and Ontologies may certainly provide invaluable solutions to facilitate the discovery process. In addition, Quality of Service (QoS) characteristics may also be taken into consideration towards optimizing service compositions. In this paper we firstly attempt to stress the importance of properly discovering and selecting WS by reviewing recent research results and secondly to analyze and identify the current discrete dynamic service composition approaches. Our interest is both for QoSaware service compositions (system level), and for Businessdriven automated compositions (business level). We highlight the advantages, the methods and techniques involved and the challenges of each approach. Finally, we analyze their influence on designing and implementing interoperable e-commerce transactions as solutions that exploit dynamic composition scenarios. Copyright 2012 ACM.


Koukourikos K.,ATEI Thessaloniki | Tsaloglidou A.,ATEI Thessaloniki | Kourkouta L.,ATEI Thessaloniki
Acta Informatica Medica | Year: 2014

Introduction: The muscle atrophy is one of the most important and frequent problems observed in patients in Intensive Care Units. The term describes the disorder in the structure and in the function of the muscle while incidence rates range from 25-90 % in patients with prolonged hospitalization. Purpose: This is a review containing all data related to the issue of muscle atrophy and is especially referred to its causes and risk factors. The importance of early diagnosis and early mobilization are also highlighted in the study. Material and methods: a literature review was performed on valid databases such as Scopus, PubMed, Cinhal for the period 2000-2013 in English language. The following keywords were used: loss of muscle mass, ICU patients, immobilization, bed rest. Results: From the review is concluded that bed rest and immobilization in order to reduce total energy costs, are the main causes for the appearance of the problem. The results of the reduction of the muscle mass mainly affect the musculoskeletal, cardiovascular and respiratory system. The administration of the cortisone, the immobility, the sepsis and hyperglycemia are included in the risk factors. The prevention is the primary therapeutic agent and this is achieved due to the early mobilization of the patients, the use of neuromuscular electrical stimulation and the avoidance of exposure to risk factors. Conclusions: The prevention of muscle atrophy is a primary goal of treatment for the patients in the ICU, because it reduces the incidence of the disease, reduces the time spent in ICU and finally improves the quality of patients' life. © AVICENA 2014.


PubMed | ATEI Thessaloniki
Type: Journal Article | Journal: Acta informatica medica : AIM : journal of the Society for Medical Informatics of Bosnia & Herzegovina : casopis Drustva za medicinsku informatiku BiH | Year: 2015

The muscle atrophy is one of the most important and frequent problems observed in patients in Intensive Care Units. The term describes the disorder in the structure and in the function of the muscle while incidence rates range from 25-90 % in patients with prolonged hospitalization.This is a review containing all data related to the issue of muscle atrophy and is especially referred to its causes and risk factors. The importance of early diagnosis and early mobilization are also highlighted in the study.a literature review was performed on valid databases such as Scopus, PubMed, Cinhal for the period 2000-2013 in English language. The following keywords were used: loss of muscle mass, ICU patients, immobilization, bed rest.From the review is concluded that bed rest and immobilization in order to reduce total energy costs, are the main causes for the appearance of the problem. The results of the reduction of the muscle mass mainly affect the musculoskeletal, cardiovascular and respiratory system. The administration of the cortisone, the immobility, the sepsis and hyperglycemia are included in the risk factors. The prevention is the primary therapeutic agent and this is achieved due to the early mobilization of the patients, the use of neuromuscular electrical stimulation and the avoidance of exposure to risk factors.The prevention of muscle atrophy is a primary goal of treatment for the patients in the ICU, because it reduces the incidence of the disease, reduces the time spent in ICU and finally improves the quality of patients life.

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