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Borjan D, Knez Marevci M, Knez Ž. P-x,y Equilibrium Data of the Binary Systems of 2-Propanol, 1-Butanol and 2-Butanol with Carbon Dioxide at 313.15 K and 333.15 K. Molecules 2022; 27:molecules27238352. [PMID: 36500443 PMCID: PMC9739634 DOI: 10.3390/molecules27238352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/17/2022] [Accepted: 11/29/2022] [Indexed: 12/03/2022]
Abstract
The ability to predict the behaviour of high-pressure mixtures of carbon dioxide and alcohol is important for industrial purposes. The equilibrium composition of three binary carbon dioxide-alcohol systems was measured at temperatures of 313.15 K and 333.15 K and at pressures of up to 100 bar for carbon dioxide-2-propanol, up to 160 bar for carbon dioxide-1-butanol and up to 150 bar for carbon dioxide-2-butanol. Different equilibrium compositions of carbon dioxide in alcohols were observed despite their similar molecular weight (M2-propanol = 60.100 g mol-1, M1-butanol = 74.121 g mol-1 and M2-butanol = 74.122 g mol-1) and place in the functional hydroxyl group (first or second carbon molecule). It is assumed that the differences in the phase equilibria are due to different vapor pressures, polarities and solute-solute interactions.
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Affiliation(s)
- Dragana Borjan
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, 2000 Maribor, Slovenia
| | - Maša Knez Marevci
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, 2000 Maribor, Slovenia
| | - Željko Knez
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, 2000 Maribor, Slovenia
- Laboratory for Chemistry, Faculty of Medicine, University of Maribor, 2000 Maribor, Slovenia
- Correspondence:
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Borjan D, Šeregelj V, Andrejč DC, Pezo L, Šaponjac VT, Knez Ž, Vulić J, Marevci MK. Green Techniques for Preparation of Red Beetroot Extracts with Enhanced Biological Potential. Antioxidants (Basel) 2022; 11:antiox11050805. [PMID: 35624669 PMCID: PMC9138100 DOI: 10.3390/antiox11050805] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 04/14/2022] [Accepted: 04/19/2022] [Indexed: 11/16/2022] Open
Abstract
Red beetroot is well known for its high proportion of betalains, with great potential as functional food ingredients due to their health-promoting properties. The objective of this study was to investigate the influence of processing techniques such as Soxhlet, cold, ultrasound and supercritical fluid extraction on the betalains content and its antioxidant, anti-inflammatory and antihyperglycemic activities. Whilst Soxhlet extraction with water has provided the highest yield, the highest content of total phenolics was found in an extract prepared using Soxhlet extraction with 50% ethanol. Amongst eight phenolic compounds detected in the extracts, protocatechuic acid was the most abundant. The concentrations of total phenolics ranged from 12.09 mg/g (ultrasound extraction with 30% methanol) to 18.60 mg/g (Soxhlet extraction with 50% ethanol). The highest anti-inflammatory activity was observed for cold extraction with 50% methanol extract. The high radical scavenging activity of supercritical fluid extracts could be a consequence of nonphenolic compounds. The chemometrics approach was further used to analyse the results to find the “greenest” method for further possible application in the processing of beetroot in the food and/or pharmaceutical industry. According to the standard score, the best extraction method was determined to be Soxhlet extraction with 50% ethanol.
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Affiliation(s)
- Dragana Borjan
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia; (D.B.); (D.C.A.); (Ž.K.)
| | - Vanja Šeregelj
- Faculty of Technology Novi Sad, University of Novi Sad, Bulevar cara Lazara 1, 21000 Novi Sad, Serbia; (V.Š.); (V.T.Š.); (J.V.)
| | - Darija Cör Andrejč
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia; (D.B.); (D.C.A.); (Ž.K.)
| | - Lato Pezo
- Institute of General and Physical Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia;
| | - Vesna Tumbas Šaponjac
- Faculty of Technology Novi Sad, University of Novi Sad, Bulevar cara Lazara 1, 21000 Novi Sad, Serbia; (V.Š.); (V.T.Š.); (J.V.)
| | - Željko Knez
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia; (D.B.); (D.C.A.); (Ž.K.)
- Laboratory for Chemistry, Faculty of Medicine, University of Maribor, Taborska Ulica 8, 2000 Maribor, Slovenia
| | - Jelena Vulić
- Faculty of Technology Novi Sad, University of Novi Sad, Bulevar cara Lazara 1, 21000 Novi Sad, Serbia; (V.Š.); (V.T.Š.); (J.V.)
| | - Maša Knez Marevci
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia; (D.B.); (D.C.A.); (Ž.K.)
- Correspondence:
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Borjan D, Knez Ž, Knez M. Recycling of Carbon Fiber-Reinforced Composites-Difficulties and Future Perspectives. Materials (Basel) 2021; 14:ma14154191. [PMID: 34361384 PMCID: PMC8347574 DOI: 10.3390/ma14154191] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/21/2021] [Accepted: 07/23/2021] [Indexed: 11/23/2022]
Abstract
Carbon fiber-reinforced composites present an exciting combination of properties and offer clear advantages that make them a perfect replacement for a spread of materials. Consequently, in recent years, their production has dramatically increased as well as the quantity of waste materials. As future legislations are likely to prevent the use of landfills and incineration to dispose of composite waste, alternative solutions such as recycling are considered as one of the urgent problems to be settled. This study presents the leading technologies for recycling carbon fiber-reinforced composites, focusing on chemical recycling using sub- and supercritical fluids. These new reaction media have been demonstrated to be more manageable and efficient in recovering clean fibers with good mechanical properties. The conventional technologies of carbon fibers recycling have also been reviewed and described with both advantages and drawbacks.
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Affiliation(s)
- Dragana Borjan
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia; (D.B.); (Ž.K.)
| | - Željko Knez
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia; (D.B.); (Ž.K.)
- Laboratory for Chemistry, Faculty of Medicine, University of Maribor, Taborska ulica 8, 2000 Maribor, Slovenia
| | - Maša Knez
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia; (D.B.); (Ž.K.)
- Correspondence:
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Borjan D, Leitgeb M, Knez Ž, Hrnčič MK. Microbiological and Antioxidant Activity of Phenolic Compounds in Olive Leaf Extract. Molecules 2020; 25:molecules25245946. [PMID: 33334001 PMCID: PMC7765412 DOI: 10.3390/molecules25245946] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 12/14/2020] [Indexed: 01/18/2023] Open
Abstract
According to many reports, phenolic compounds isolated from olive leaves have very good biological activities, especially antimicrobial. Presently, the resistance of microorganisms to antibiotics is greater than ever. Therefore, there are numerous recent papers about alternative solutions for inhibiting their influence on human health. Olive leaf is studied as an important source of antimicrobials with low cost and used in medicine. Numerous publications on involving green technologies for isolation of active compounds from olive leaves have appeared over the past few decades. The present review reports on current knowledge of the most isolated phenolic compounds from olive leaf extract as well as methods for their isolation and characterization. This paper uses recent research findings with a wide range of study models to describe the antimicrobial potential of phenolic compounds. It also describes the vast range of information about methods for determination of antimicrobial potential focusing on effects on different microbes. Additionally, it serves to highlight the role of olive leaf extract as an antioxidants and presents methods for determination of antioxidant potential. Furthermore, it provides an overview of presence of enzymes. The significance of olive leaves as industrial and agricultural waste is emphasized by means of explaining their availability, therapeutic and nutritional effects, and research conducted on this field.
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Affiliation(s)
- Dragana Borjan
- Faculty of Chemistry and Chemical Engineering, University of Maribor, SI-2000 Maribor, Slovenia; (D.B.); (M.L.); (Ž.K.)
| | - Maja Leitgeb
- Faculty of Chemistry and Chemical Engineering, University of Maribor, SI-2000 Maribor, Slovenia; (D.B.); (M.L.); (Ž.K.)
| | - Željko Knez
- Faculty of Chemistry and Chemical Engineering, University of Maribor, SI-2000 Maribor, Slovenia; (D.B.); (M.L.); (Ž.K.)
- Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia
| | - Maša Knez Hrnčič
- Faculty of Chemistry and Chemical Engineering, University of Maribor, SI-2000 Maribor, Slovenia; (D.B.); (M.L.); (Ž.K.)
- Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia
- Correspondence: ; Tel.: +386-2229-4477; Fax: +386-2229-4401
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