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Burbano JJ, Cabezas DM, Correa MJ. Characterization and Techno-Functional Properties of High Protein Walnut Flour from an Oil by-Product. PLANT FOODS FOR HUMAN NUTRITION (DORDRECHT, NETHERLANDS) 2024:10.1007/s11130-024-01219-1. [PMID: 39141162 DOI: 10.1007/s11130-024-01219-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/27/2024] [Indexed: 08/15/2024]
Abstract
A high protein walnut flour (HPWF) was obtained by defatting walnut flour (WF), which is a by-product of the oil industry. The objective of this study was the chemical and techno-functional characterization of HPWF. Composition, amino acid content, protein secondary structure, protein solubility and thermal transitions were measured. Besides, the techno-functional properties, emulsion activity and stability, and water holding and oil absorption capacities, of HPWF were evaluated. Also, the molecular mass of proteins under denaturing conditions and the microstructure of HPWF were evaluated by electrophoresis and confocal scanning laser microscopy, respectively. HPWF had 55.4% protein content and 21.5% total dietary fibre. In terms of HPWF amino acid composition, the limiting amino acids were the sulphurated cysteine and methionine. By FTIR analysis, the main secondary structures were β-sheet (49%) followed by α-helix (24%); both structures are considered to be ordered. Likewise, HPWF soluble proteins increased at basic pH and HPWF proteins were separated in 11 bands with molecular masses ranging from 97 kDa to 18 kDa by electrophoresis. With respect to techno-functional properties, HPWF presented good emulsion activity (51%) and high thermal emulsion stability (46%). In addition, HPWF retained 571% and 242% of water and oil by weight, respectively. Finally, the micrograph showed the predominance of protein structures and fibre fragments, and the presence of few lipids mostly trapped. These results showed that HPWF is an interesting source of plant-based proteins and walnut flour can be used to obtain high protein ingredients from non-traditional sources.
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Affiliation(s)
- Juan José Burbano
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, 47 y 116, (C.P 1900), La Plata, Argentina.
| | - Darío Marcelino Cabezas
- Laboratorio de Investigación en Funcionalidad y Tecnología de Alimentos (LIFTA), Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Bernal, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), CABA, Argentina
| | - María Jimena Correa
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, 47 y 116, (C.P 1900), La Plata, Argentina.
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Gul O, Gul LB, Baskıncı T, Parlak ME, Saricaoglu FT. Influence of pH and ionic strength on the bulk and interfacial rheology and technofunctional properties of hazelnut meal protein isolate. Food Res Int 2023; 169:112906. [PMID: 37254341 DOI: 10.1016/j.foodres.2023.112906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 04/05/2023] [Accepted: 04/24/2023] [Indexed: 06/01/2023]
Abstract
The functional, bulk, and interfacial shear rheological properties of hazelnut protein isolate were studied at different pH values between 3.0 and 8.0 and ionic strength levels between 0.0 and 1.0 M. The results showed that pH significantly affected protein solubility, emulsion properties, water and oil holding capacities, foam stability, surface hydrophobicity, and free -SH groups. The highest surface hydrophobicity, free -SH groups, and better functional properties were observed at pH 8.0. Protein solubility also increased with increasing ionic strength up to 0.6 M. The emulsion and foam stability of hazelnut protein isolate showed similar changes with protein solubility. The flow behavior of hazelnut protein suspensions was found to be shear thinning with the highest consistency index at pH 3.0 and the lowest at pH 6.0, however, the ionic strength did not significantly affect the consistency coefficient but did cause a significant change in the flow behavior index, with the lowest value observed at 0.6 M. The best gel structure in hazelnut proteins was observed at pH 3.0 and 4.0. The addition of ions at 0.4 and 0.6 M concentrations resulted in an improved viscoelastic character. The hazelnut protein isolate was also found to form solid-like viscoelastic layers at both air-water and oil-water interfaces, with the interfacial adsorption behavior affected by both pH and ionic strength. Overall, these results suggest that pH and ionic strength have significant effects on the functional and rheological properties of hazelnut protein isolate, which may have the potential as an auxiliary substance in food systems.
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Affiliation(s)
- Osman Gul
- Department of Food Engineering, Faculty of Engineering and Architecture, Kastamonu University, Kastamonu, Turkey
| | - Latife Betul Gul
- Department of Food Engineering, Faculty of Engineering, Giresun University, Giresun, Turkey.
| | - Tugba Baskıncı
- Department of Food Engineering, Faculty of Engineering and Architecture, Kastamonu University, Kastamonu, Turkey
| | - Mahmut Ekrem Parlak
- Department of Food Engineering, Faculty of Engineering and Natural Sciences, Bursa Technical University, Bursa, Turkey
| | - Furkan Turker Saricaoglu
- Department of Food Engineering, Faculty of Engineering and Natural Sciences, Bursa Technical University, Bursa, Turkey
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Ceylan F, Adrar N, Günal-Köroğlu D, Gültekin Subaşı B, Capanoglu E. Combined Neutrase-Alcalase Protein Hydrolysates from Hazelnut Meal, a Potential Functional Food Ingredient. ACS OMEGA 2023; 8:1618-1631. [PMID: 36643436 PMCID: PMC9835803 DOI: 10.1021/acsomega.2c07157] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Accepted: 11/21/2022] [Indexed: 06/17/2023]
Abstract
Consumers' interest in functional foods has significantly increased in the past few years. Hazelnut meal, the main valuable byproduct of the hazelnut oil industry, is a rich source of proteins and bioactive peptides and thus has great potential to become a valuable functional ingredient. In this study, hazelnut protein hydrolysates obtained by a single or combined hydrolysis by Alcalase and Neutrase were mainly characterized for their physicochemical properties (SDS-PAGE, particle size distribution, Fourier-transform infrared (FTIR) spectroscopy, molecular weight distribution, etc.) and potential antiobesity effect (Free fatty acid (FFA) release inhibition), antioxidant activity (DPPH and ABTS methods), and emulsifying properties. The impact of a microfluidization pretreatment was also investigated. The combination of Alcalase with Neutrase permitted the highest degree of hydrolysis (DH; 15.57 ± 0.0%) of hazelnut protein isolate, which resulted in hydrolysates with the highest amount of low-molecular-weight peptides, as indicated by size exclusion chromatography (SEC) and SDS-PAGE. There was a positive correlation between the DH and the inhibition of FFA release by pancreatic lipase (PL), with a significant positive effect of microfluidization when followed by Alcalase hydrolysis. Microfluidization enhanced the emulsifying activity index (EAI) of protein isolates and hydrolysates. Low hydrolysis by Neutrase had the best effect on the EAI (84.32 ± 1.43 (NH) and 88.04 ± 2.22 m2/g (MFNH)), while a negative correlation between the emulsifying stability index (ESI) and the DH was observed. Again, the combined Alcalase-Neutrase hydrolysates displayed the highest radical scavenging activities (96.63 ± 1.06% DPPH and 98.31 ± 0.46% ABTS). FTIR results showed that the application of microfluidization caused the unfolding of the protein structure. The individual or combined application of the Alcalase and Neutrase enzymes caused a switch from the β-sheet organization of the proteins to α-helix structures. In conclusion, hazelnut meal may be a good source of bioactive and functional peptides. The control of its enzymatic hydrolysis, together with an appropriate pretreatment such as microfluidization, may be crucial to achieve the best suitable activity.
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Affiliation(s)
- Fatma
Duygu Ceylan
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469Istanbul, Turkey
| | - Nabil Adrar
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469Istanbul, Turkey
| | - Deniz Günal-Köroğlu
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469Istanbul, Turkey
| | - Büşra Gültekin Subaşı
- Biology
and Biological Engineering, Division of Food and Nutrition Science, Chalmers University of Technology, SE-412 96Gothenburg, Sweden
| | - Esra Capanoglu
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469Istanbul, Turkey
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Ceylan FD, Adrar N, Bolling BW, Capanoglu E. Valorisation of hazelnut by-products: current applications and future potential. Biotechnol Genet Eng Rev 2022:1-36. [PMID: 36576098 DOI: 10.1080/02648725.2022.2160920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 12/16/2022] [Indexed: 12/29/2022]
Abstract
Hazelnut is one of the most widely consumed nuts around the world. Considering the nutritional value of hazelnuts, a wide range of hazelnut-based food products are available in the market such as oil, chocolate, confectionery, etc. Nevertheless, the processing of hazelnuts generates a large number of by-products and waste. The most valuable by-products of the hazelnut industry are shell, skin, and meal. These by-products are rich in bioactive compounds, protein, dietary fibre, mono- and polyunsaturated fatty acids, vitamins, minerals, phytosterols, and squalene. The current utilisation of hazelnut by-products is mostly limited to animal feed supplementation of hazelnut meal and skin and use as a low-value heat source for the shells. However, disposing of these by-products or using them as a low-value heat source or animal feed supplementation results in significant waste of a natural resource rich in nutritional components. Consequently, valorising hazelnut by-products as bioactive ingredients in diverse fields such as food, pharmaceuticals and cosmetics has stimulated interest among scientists, producers, and consumers. This review provides an overview of current scientific knowledge about the main and most valuable hazelnut by-products and their actual valorisation, with a focus on their chemical composition to inspire new applications of these valuable resources and fully exploit their potential.
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Affiliation(s)
- Fatma Duygu Ceylan
- Faculty of Chemical & Metallurgical Engineering, Food Engineering Department, Istanbul Technical University, Maslak, Turkey
| | - Nabil Adrar
- Faculty of Chemical & Metallurgical Engineering, Food Engineering Department, Istanbul Technical University, Maslak, Turkey
| | - Bradley W Bolling
- Department of Food Science, University of Wisconsin-Madison, Madison, WI, USA
| | - Esra Capanoglu
- Faculty of Chemical & Metallurgical Engineering, Food Engineering Department, Istanbul Technical University, Maslak, Turkey
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Interactions between Hazelnut (Corylus avellana L.) Protein and Phenolics and In Vitro Gastrointestinal Digestibility. SEPARATIONS 2022. [DOI: 10.3390/separations9120406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
In this study, we investigated the formation of protein–phenolic complexes from dephenolized hazelnut meal protein isolates (dHPI) and hazelnut skin phenolic extracts (HSE) and their effects on the bioaccessibility of both hazelnut proteins and phenolics. The dHPI–HSE complexes were of considerable size and were dependent on HSE concentration due to aggregation. Although catechin was the main component of HSE, it did not cause aggregation, except for a slight rise in particle size. According to fluorescence quenching, the hazelnut protein–phenolic extract complex had a linear Stern–Volmer plot expressing static quenching between 0–0.5 mM concentration; the interaction was mainly dependent on hydrogen bonding and van der Waals forces (ΔH < 0 and ΔS < 0), and the reaction was spontaneous (ΔG < 0). According to Fourier transform infrared (FTIR) spectroscopy results, higher phenolic extract concentration caused an increase in irregular structures in hazelnut protein, while the lowest catechin and phenolic concentration altered the regular structure. Skin extracts did not alter the digestibility of dephenolized proteins, but dephenolization reduced the degree of hydrolysis by pancreatin. The formation of the protein–phenolic complex had a beneficial effect on the bioaccessibility of hazelnut skin phenols, predominantly those on the galloylated form of the catechins, such as gallocatechin gallate and epigallocatechin gallate. Thus, the bioaccessibility and antioxidant activity analysis results showed that protein–phenolic complexes obtained from hazelnut meal and skin may promote the transition of phenolic compounds from the gastrointestinal tract without degradation.
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Göksu AG, Çakır B, Gülseren İ. Hazelnut peptide fractions preserve their bioactivities beyond industrial manufacture and simulated digestion of hazelnut cocoa cream. Food Res Int 2022; 161:111865. [DOI: 10.1016/j.foodres.2022.111865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 08/02/2022] [Accepted: 08/21/2022] [Indexed: 11/17/2022]
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Shi C, Liu M, Zhao H, Lv Z, Liang L, Zhang B. A Novel Insight into Screening for Antioxidant Peptides from Hazelnut Protein: Based on the Properties of Amino Acid Residues. Antioxidants (Basel) 2022; 11:antiox11010127. [PMID: 35052631 PMCID: PMC8772696 DOI: 10.3390/antiox11010127] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 12/25/2021] [Accepted: 12/26/2021] [Indexed: 12/13/2022] Open
Abstract
This study used the properties of amino acid residues to screen antioxidant peptides from hazelnut protein. It was confirmed that the type and position of amino acid residues, grand average of hydropathy, and molecular weight of a peptide could be comprehensively applied to obtain desirable antioxidants after analyzing the information of synthesized dipeptides and BIOPEP database. As a result, six peptides, FSEY, QIESW, SEGFEW, IDLGTTY, GEGFFEM, and NLNQCQRYM were identified from hazelnut protein hydrolysates with higher antioxidant capacity than reduced Glutathione (GSH) against linoleic acid oxidation. The peptides having Tyr residue at C-terminal were found to prohibit the oxidation of linoleic acid better than others. Among them, peptide FSEY inhibited the rancidity of hazelnut oil very well in an oil-in-water emulsion. Additionally, quantum chemical parameters proved Tyr-residue to act as the active site of FSEY are responsible for its antioxidation. This is the first presentation of a novel approach to excavating desired antioxidant peptides against lipid oxidation from hazelnut protein via the properties of amino acid residues.
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Affiliation(s)
- Chenshan Shi
- Beijing Key Laboratory of Forest Food Processing and Safety, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China; (C.S.); (M.L.); (H.Z.); (Z.L.)
| | - Miaomiao Liu
- Beijing Key Laboratory of Forest Food Processing and Safety, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China; (C.S.); (M.L.); (H.Z.); (Z.L.)
| | - Hongfei Zhao
- Beijing Key Laboratory of Forest Food Processing and Safety, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China; (C.S.); (M.L.); (H.Z.); (Z.L.)
| | - Zhaolin Lv
- Beijing Key Laboratory of Forest Food Processing and Safety, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China; (C.S.); (M.L.); (H.Z.); (Z.L.)
| | - Lisong Liang
- Key Laboratory of Tree Breeding and Cultivation of the State Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing 100091, China
- Hazelnut Engineering and Technical Research Center of the State Forestry and Grassland Administration, Beijing 100091, China
- National Innovation Alliance of Hazelnut Industry, Beijing 100091, China
- Correspondence: (L.L.); (B.Z.); Tel.: +86-010-6288-9634 (L.L.); +86-010-6233-8221 (B.Z.)
| | - Bolin Zhang
- Beijing Key Laboratory of Forest Food Processing and Safety, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China; (C.S.); (M.L.); (H.Z.); (Z.L.)
- Correspondence: (L.L.); (B.Z.); Tel.: +86-010-6288-9634 (L.L.); +86-010-6233-8221 (B.Z.)
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8
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Geow CH, Tan MC. Pretreatment effect of osmotic dehydration on ultrasound‐assisted solvent extraction: Functional properties of defatted hazelnut meal. J FOOD PROCESS PRES 2021. [DOI: 10.1111/jfpp.16007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Chin Hong Geow
- Department of Chemical and Petroleum Engineering Faculty of Engineering, Technology and Built Environment UCSI University Cheras Kuala Lumpur Malaysia
| | - Mei Ching Tan
- Department of Chemical and Petroleum Engineering Faculty of Engineering, Technology and Built Environment UCSI University Cheras Kuala Lumpur Malaysia
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Angiotensin I-converting enzyme, dipeptidyl peptidase-IV, and α-glucosidase inhibitory potential of hazelnut meal protein hydrolysates. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2021. [DOI: 10.1007/s11694-021-00994-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Çağlar AF, Çakır B, Gülseren İ. LC-Q-TOF/MS based identification and in silico verification of ACE-inhibitory peptides in Giresun (Turkey) hazelnut cakes. Eur Food Res Technol 2021. [DOI: 10.1007/s00217-021-03700-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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11
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Spectrophotometric determination of aflatoxin B1 in food sample: Chemometric optimization and theoretical supports for reaction mechanisms and binding regions. J Food Compost Anal 2020. [DOI: 10.1016/j.jfca.2020.103646] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Zhao F, Liu X, Ding X, Dong H, Wang W. Effects of High-Intensity Ultrasound Pretreatment on Structure, Properties, and Enzymolysis of Soy Protein Isolate. Molecules 2019; 24:molecules24203637. [PMID: 31600956 PMCID: PMC6832360 DOI: 10.3390/molecules24203637] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 09/28/2019] [Accepted: 10/01/2019] [Indexed: 01/29/2023] Open
Abstract
The objective of this study was to investigate the effects of different high-intensity ultrasonication (HIU) pretreatment on the structure and properties of soybean protein isolate (SPI) as well as enzymatic hydrolysis of SPI by bromelain and antioxidant activity of hydrolysates. The HIU-treated SPI fractions showed a decrease in the proportion of α-helices and β-turns and an increase in the content of β-sheets and random coils based on Fourier-transform infrared spectroscopy. Near-infrared spectra and fluorescence spectra analyses provided support for the changes in secondary and tertiary structures of SPI after ultrasound treatment. The particle size of SPI decreased from 217.20 nm to 141.23 nm and the absolute zeta potential increased. Scanning electron microscopy showed that HIU treatment changed apparent morphology. Dynamic and static light scattering of ultrasonicated samples showed that SPI structure had changed from hard-sphere to hollow-sphere or polydisperse and monodisperse gaussian coils. HIU pretreatment significantly increased the hydroxyl-radical scavenging and the degree of hydrolysis of the SPI hydrolysates.
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Affiliation(s)
- Fei Zhao
- Department of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, China.
- Engineering and Technology Center for Grain Processing of Shandong Province, Tai'an 271018, China.
| | - Xuemei Liu
- Jinan Fruit Research Institute, All-China Federation of Supply and Marketing Co-operatives, Jinan 250014, China.
| | - Xiuzhen Ding
- Department of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, China.
- Engineering and Technology Center for Grain Processing of Shandong Province, Tai'an 271018, China.
| | - Haizhou Dong
- Department of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, China.
- Engineering and Technology Center for Grain Processing of Shandong Province, Tai'an 271018, China.
| | - Wentao Wang
- Department of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, China.
- Engineering and Technology Center for Grain Processing of Shandong Province, Tai'an 271018, China.
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
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Effect of microfluidization on the microstructure and physical properties of a novel yoghurt formulation. J FOOD ENG 2018. [DOI: 10.1016/j.jfoodeng.2018.05.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Saricaoglu FT, Gul O, Besir A, Atalar I. Effect of high pressure homogenization (HPH) on functional and rheological properties of hazelnut meal proteins obtained from hazelnut oil industry by-products. J FOOD ENG 2018. [DOI: 10.1016/j.jfoodeng.2018.04.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gul O, Saricaoglu FT, Besir A, Atalar I, Yazici F. Effect of ultrasound treatment on the properties of nano-emulsion films obtained from hazelnut meal protein and clove essential oil. ULTRASONICS SONOCHEMISTRY 2018; 41:466-474. [PMID: 29137776 DOI: 10.1016/j.ultsonch.2017.10.011] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 10/11/2017] [Accepted: 10/11/2017] [Indexed: 05/21/2023]
Abstract
Hazelnut meal protein (4% (w/v)) and clove essential oil (CEO) (3% (v/v)) were homogenized with ultrasound (US) at different times (2, 4 and 6 min) and amplitudes (50, 75 and 100%) to obtain nano-emulsion films. Film forming nano-emulsions (FFNs) were analyzed for average particle size (Dz) and zeta potential, and edible film characterization were evaluated depending on US treatment, as well as antibacterial and antioxidant activities. Dz values and zeta potential of FFNs decreased with increasing acoustic energy delivered to nano-emulsion system. Thickness and water solubility of films significantly decreased with increasing US treatment. Films became more transparent depending on US treatment probably due to particle size reduction. Tensile strength (TS) of films significantly increased with US treatment, while elongation at break (EAB) slightly increased. Microstructure of films became more homogeneous after US treatment and caused to lower water vapor permeability. Enrichment with CEO has given the films antibacterial activity against L. monocytogenes, B. subtilis, S. aureus, P. aeruginosa and E. coli, and antioxidant activity, and US application has improved these activities. US technology can be used to improve mechanical, barrier and antimicrobial properties of hazelnut meal protein based edible films enriched with CEO.
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Affiliation(s)
- Osman Gul
- Programs of Food Technology, Yesilyurt Demir-Celik Vocational School, Ondokuz Mayis University, Samsun, Turkey
| | - Furkan Turker Saricaoglu
- Department of Food Engineering, Engineering Faculty, Ondokuz Mayis University, Samsun, Turkey; Department of Food Engineering, Engineering Faculty, Bayburt University, Bayburt, Turkey.
| | - Aysegul Besir
- Department of Food Engineering, Engineering Faculty, Ondokuz Mayis University, Samsun, Turkey
| | - Ilyas Atalar
- Department of Food Engineering, Engineering Faculty, Ondokuz Mayis University, Samsun, Turkey
| | - Fehmi Yazici
- Department of Food Engineering, Engineering Faculty, Ondokuz Mayis University, Samsun, Turkey
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