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Ormanli E, Amca Uluturk B, Bozdogan N, Bayraktar O, Tavman S, Kumcuoglu S. Development of a novel, sustainable, cellulose-based food packaging material and its application for pears. Food Chem 2023; 429:136719. [PMID: 37454622 DOI: 10.1016/j.foodchem.2023.136719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 05/17/2023] [Accepted: 06/22/2023] [Indexed: 07/18/2023]
Abstract
This study aimed to develop a cellulose-based active food packaging material using paper, a biodegradable, sustainable, recyclable, renewable, and relatively low-cost material. For electrospray coating, fulvic acid (FA), which has antioxidant and antimicrobial properties, and sericin (S) were used as an active agent and a carrier medium, respectively. Solutions prepared at various concentrations and ratios of FA and S were analyzed, the properties of the active packaging material were examined, and the effect on the quality of pears was studied. The optimum conditions of electrospraying for minimum droplet size and maximum antibacterial effect were 0.8 g/mL concentration of solutions, 1:1 FA:S ratio, 20 kV voltage, 0.75 mL/h flow rate, and 23 cm collector-needle tip distance. FA had static, lethal, and inhibitory effects on Pseudomonas syringae and P. digitatum, the common pathogenic microorganisms on pears. The antioxidant activity of FA was higher than that of S (872.96 mM vs. 239.36 mM). At the end of the 90-day storage period, pears stored in the active packaging material at 7 °C and 90% RH showed better preserved color and texture, matured later, had a lower antimicrobial load, and were more appreciated in sensory evaluation than other samples.
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Affiliation(s)
- Ebru Ormanli
- Department of Food Engineering, Graduate School of Natural and Applied Sciences, Ege University, 35100 İzmir, Türkiye
| | - Buket Amca Uluturk
- Department of Food Engineering, Graduate School of Natural and Applied Sciences, Ege University, 35100 İzmir, Türkiye
| | - Neslihan Bozdogan
- Department of Food Engineering, Graduate School of Natural and Applied Sciences, Ege University, 35100 İzmir, Türkiye
| | - Oguz Bayraktar
- Department of Bioengineering, Faculty of Engineering, Ege University, 35100 İzmir, Türkiye
| | - Sebnem Tavman
- Department of Food Engineering, Faculty of Engineering, Ege University, 35100 İzmir, Türkiye
| | - Seher Kumcuoglu
- Department of Food Engineering, Faculty of Engineering, Ege University, 35100 İzmir, Türkiye.
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Nozawa D, Matsuyama A, Furuya T. Biocatalytic synthesis and evaluation of antioxidant and antibacterial activities of hydroxyequols. Bioorg Med Chem Lett 2022; 73:128908. [PMID: 35902062 DOI: 10.1016/j.bmcl.2022.128908] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/15/2022] [Accepted: 07/21/2022] [Indexed: 11/29/2022]
Abstract
Hydroxyequols are promising analogues of the biologically active flavonoid, equol. We recently found that the flavin-dependent monooxygenase HpaBro-3 of Rhodococcus opacus regioselectively synthesizes 3'-hydroxyequol from equol, whereas HpaBpl-1 of Photorhabdus luminescens synthesizes 6-hydroxyequol. In this study, we investigated the cascade synthesis of a dihydroxyequol compound from equol using these two enzymes. When Escherichia coli cells expressing HpaBro-3 and cells expressing HpaBpl-1 were simultaneously incubated with equol, the cells efficiently synthesized 6,3'-dihydroxyequol (8.7 mM, 2.4 g/L) via 3'- and 6-hydroxyequols in one pot. The antioxidant activity of the equol derivatives increased with an increase in the number of hydroxyl groups on the equol scaffold. 6,3'-Dihydroxyequol exhibited potent antioxidant activity. In addition, 6-hydroxyequol significantly inhibited the growth of E. coli. Cell survival studies suggested that 6-hydroxyequol is a bactericidal rather than bacteriostatic compound. To our knowledge, this is the first report describing the antibacterial activity of hydroxyequols.
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Affiliation(s)
- Daiki Nozawa
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | | | - Toshiki Furuya
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
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Hydroxy-tyrosol as a Free Radical Scavenging Molecule in Polymeric Hydrogels Subjected to Gamma-Ray Irradiation. Processes (Basel) 2021. [DOI: 10.3390/pr9030433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Biomedical engineering is employing hydrogels with increasingly exciting possibilities for the treatment and regeneration of pathologically altered, degenerated, or traumatized tissues. Still, the sterilization processes may undesirably change the chemical and physical properties of hydrogels through cross-linking reactions. This work aims to characterize a new method of producing polyethylene oxide (PEO) hydrogels exploiting hydroxy-tyrosol (HT), an anti-oxidant molecule derived from olive leaf and olive oil, as a free radical scavenger to either prevent or limit gamma-ray-induced cross-linking. For this purpose, we produced hydrogels with PEO with two different buffer solutions (phosphate and citrate), varying HT concentration. We analyzed hydrogel preparations before and after gamma-ray irradiation, assessing the viscosity through rheological analysis and the chemical changes through IR analysis. We performed high-performance liquid chromatography (HPLC) analysis to measure residual HT in hydrogels after irradiation. The obtained results show that radiation-induced cross-linking and increase in viscosity of PEO hydrogels can be prevented by tailoring the concentration of HT as a free radical scavenging agent. Irradiation only consumes small amounts of HT; its presence in polymeric hydrogels can significantly impact biomedical applications by its anti-oxidant and anti-microbial activities.
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Apak R, Güçlü K, Demirata B, Özyürek M, Çelik SE, Bektaşoğlu B, Berker KI, Özyurt D. Comparative evaluation of various total antioxidant capacity assays applied to phenolic compounds with the CUPRAC assay. Molecules 2007; 12:1496-547. [PMID: 17909504 PMCID: PMC6149428 DOI: 10.3390/12071496] [Citation(s) in RCA: 530] [Impact Index Per Article: 31.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2007] [Revised: 07/17/2007] [Accepted: 07/18/2007] [Indexed: 11/17/2022] Open
Abstract
It would be desirable to establish and standardize methods that can measure the total antioxidant capacity level directly from vegetable extracts containing phenolics. Antioxidant capacity assays may be broadly classified as electron transfer (ET)- and hydrogen atom transfer (HAT)-based assays. The majority of HAT assays are kinetics-based, and involve a competitive reaction scheme in which antioxidant and substrate compete for peroxyl radicals thermally generated through the decomposition of azo compounds. ET-based assays measure the capacity of an antioxidant in the reduction of an oxidant, which changes colour when reduced. ET assays include the ABTS/TEAC, CUPRAC, DPPH, Folin-Ciocalteu and FRAP methods, each using different chromogenic redox reagents with different standard potentials. This review intends to offer a critical evaluation of existing antioxidant assays applied to phenolics, and reports the development by our research group of a simple and low-cost antioxidant capacity assay for dietary polyphenols, vitamins C and E, and human serum antioxidants, utilizing the copper(II)-neocuproine reagent as the chromogenic oxidizing agent, which we haved named the CUPRAC (cupric ion reducing antioxidant capacity) method. This method offers distinct advantages over other ET-based assays, namely the selection of working pH at physiological pH (as opposed to the Folin and FRAP methods, which work at alkaline and acidic pHs, respectively), applicability to both hydrophilic and lipophilic antioxidants (unlike Folin and DPPH), completion of the redox reactions for most common flavonoids (unlike FRAP), selective oxidation of antioxidant compounds without affecting sugars and citric acid commonly contained in foodstuffs and the capability to assay -SH bearing antioxidants (unlike FRAP). Other similar ET-based antioxidant assays that we have developed or modified for phenolics are the Fe(III)- and Ce(IV)-reducing capacity methods.
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Affiliation(s)
- Reşat Apak
- Istanbul University, Faculty of Engineering, Department of Chemistry, Avcilar, Istanbul 34320 Turkey; e-mails: , , ,
| | - Kubilay Güçlü
- Istanbul University, Faculty of Engineering, Department of Chemistry, Avcilar, Istanbul 34320 Turkey; e-mails: , , ,
| | - Birsen Demirata
- Istanbul Technical University, Faculty of Arts & Sciences, Department of Chemistry, Maslak, Istanbul Turkey; e-mail: ,
| | - Mustafa Özyürek
- Istanbul University, Faculty of Engineering, Department of Chemistry, Avcilar, Istanbul 34320 Turkey; e-mails: , , ,
| | - Saliha Esin Çelik
- Istanbul University, Faculty of Engineering, Department of Chemistry, Avcilar, Istanbul 34320 Turkey; e-mails: , , ,
| | - Burcu Bektaşoğlu
- Istanbul University, Faculty of Engineering, Department of Chemistry, Avcilar, Istanbul 34320 Turkey; e-mails: , , ,
| | - K. Işıl Berker
- Istanbul University, Faculty of Engineering, Department of Chemistry, Avcilar, Istanbul 34320 Turkey; e-mails: , , ,
| | - Dilek Özyurt
- Istanbul Technical University, Faculty of Arts & Sciences, Department of Chemistry, Maslak, Istanbul Turkey; e-mail: ,
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