1
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Newson W, Capezza AJ, Kuktaite R, Hedenqvist MS, Johansson E. Green Chemistry to Modify Functional Properties of Crambe Protein Isolate-Based Thermally Formed Films. ACS OMEGA 2023; 8:20342-20351. [PMID: 37323394 PMCID: PMC10268266 DOI: 10.1021/acsomega.3c00113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 05/19/2023] [Indexed: 06/17/2023]
Abstract
Proteins are promising precursors to be used in production of sustainable materials with properties resembling plastics, although protein modification or functionalization is often required to obtain suitable product characteristics. Here, effects of protein modification were evaluated by crosslinking behavior using high-performance liquid chromatography (HPLC), secondary structure using infrared spectroscopy (IR), liquid imbibition and uptake, and tensile properties of six crambe protein isolates modified in solution before thermal pressing. The results showed that a basic pH (10), especially when combined with the commonly used, although moderately toxic, crosslinking agent glutaraldehyde (GA), resulted in a decrease in crosslinking in unpressed samples, as compared to acidic pH (4) samples. After pressing, a more crosslinked protein matrix with an increase in β-sheets was obtained in basic samples compared to acidic samples, mainly due to the formation of disulfide bonds, which led to an increase in tensile strength, and liquid uptake with less material resolved. A treatment of pH 10 + GA, combined either with a heat or citric acid treatment, did not increase crosslinking or improve the properties in pressed samples, as compared to pH 4 samples. Fenton treatment at pH 7.5 resulted in a similar amount of crosslinking as the pH 10 + GA treatment, although with a higher degree of peptide/irreversible bonds. The strong bond formation resulted in lack of opportunities to disintegrate the protein network by all extraction solutions tested (even for 6 M urea + 1% sodium dodecyl sulfate + 1% dithiothreitol). Thus, the highest crosslinking and best properties of the material produced from crambe protein isolates were obtained by pH 10 + GA and pH 7.5 + Fenton, where Fenton is a greener and more sustainable solution than GA. Therefore, chemical modification of crambe protein isolates is effecting both sustainability and crosslinking behavior, which might have an effect on product suitability.
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Affiliation(s)
- William
R. Newson
- Department
of Plant Breeding, Swedish University of
Agricultural Sciences, P.O. Box 190, SE-234 22 Lomma, Sweden
| | - Antonio J. Capezza
- Department
of Plant Breeding, Swedish University of
Agricultural Sciences, P.O. Box 190, SE-234 22 Lomma, Sweden
- Department
of Fibre and Polymer Technology, Royal Institute
of Technology, SE-10044 Stockholm, Sweden
| | - Ramune Kuktaite
- Department
of Plant Breeding, Swedish University of
Agricultural Sciences, P.O. Box 190, SE-234 22 Lomma, Sweden
| | - Mikael S. Hedenqvist
- Department
of Fibre and Polymer Technology, Royal Institute
of Technology, SE-10044 Stockholm, Sweden
| | - Eva Johansson
- Department
of Plant Breeding, Swedish University of
Agricultural Sciences, P.O. Box 190, SE-234 22 Lomma, Sweden
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2
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Qiao F, Chen X, Yan H. Fabrication of superparamagnetic bovine haemoglobin surface-imprinted core-shell nanocomposite adsorbent via emulsion-free sol-gel polymerization. J Chromatogr A 2023; 1695:463956. [PMID: 37019061 DOI: 10.1016/j.chroma.2023.463956] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/25/2023] [Accepted: 03/27/2023] [Indexed: 03/31/2023]
Abstract
A new strategy has been developed to fabricate a bovine haemoglobin surface-imprinted core-shell nanocomposite adsorbent, demonstrating superparamagnetism via emulsion-free and sol-gel techniques. The obtained magnetic surface-imprinted polymers (MSIPs) possess a porous core-shell nanocomposite structure with a remarkable imprinted recognition ability for template protein in aqueous medium. The MSIPs display higher affinity, adsorption efficiency and selectivity, for template protein compared to the non-target protein. The morphology, adsorption, and recognition properties of the MSIPs have been evaluated by using several characterisation techniques, such as scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and vibrating sample magnetometry. The results show the average diameter of MSIPs ranging between 400 and 600 nm with a saturation magnetization value of 52.6 emu/g and adsorption capacity of 43.75 mg/g. And because the obtained MSIPs possessed easily accessible recognition sites and performed fast kinetics for template immobilization, it could achieve equilibrium within 60 min. All this revealed the potential application of this approach as an alternative methodology for the generation of protein imprinted biomaterials.
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Affiliation(s)
- Fengxia Qiao
- College of Biochemistry and Environmental Engineering, Baoding University, Baoding 071000, China; Key Laboratory of Public Health Safety of Hebei Province, School of Public Health, Hebei University, Baoding 071002, China.
| | - Xiaojing Chen
- College of Biochemistry and Environmental Engineering, Baoding University, Baoding 071000, China
| | - Hongyuan Yan
- Key Laboratory of Public Health Safety of Hebei Province, School of Public Health, Hebei University, Baoding 071002, China; Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, College of Pharmaceutical Sciences, Hebei University, Baoding 071002, China
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3
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Aguzin A, Luque GC, Ronco LI, Del Agua I, Guzmán-González G, Marchiori B, Gugliotta A, Tomé LC, Gugliotta LM, Mecerreyes D, Minari RJ. Gelatin and Tannic Acid Based Iongels for Muscle Activity Recording and Stimulation Electrodes. ACS Biomater Sci Eng 2022; 8:2598-2609. [PMID: 35649235 DOI: 10.1021/acsbiomaterials.2c00317] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Iongels are soft ionic conducting materials, usually composed of polymer networks swollen with ionic liquids (ILs), which are being investigated for applications ranging from energy to bioelectronics. The employment of iongels in bioelectronic devices such as bioelectrodes or body sensors has been limited by the lack of biocompatibility of the ILs and/or polymer matrices. In this work, we present iongels prepared from solely biocompatible materials: (i) a biobased polymer network containing tannic acid as a cross-linker in a gelatin matrix and (ii) three different biocompatible cholinium carboxylate ionic liquids. The resulting iongels are flexible and elastic with Young's modulus between 11.3 and 28.9 kPa. The morphology of the iongels is based on a dual polymer network system formed by both chemical bonding due to the reaction of the gelatin's amines with the polyphenol units and physical interactions between the tannic acid and the gelatin. These biocompatible iongels presented high ionic conductivity values, from 0.003 and up to 0.015 S·cm-1 at room temperature. Furthermore, they showed excellent performance as a conducting gel in electrodes for electromyography and electrocardiogram recording as well as muscle stimulation.
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Affiliation(s)
- Ana Aguzin
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), CONICET, Güemes 3450, Santa Fe 3000, Argentina
| | - Gisela C Luque
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), CONICET, Güemes 3450, Santa Fe 3000, Argentina.,Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, Santa Fe 3000, Argentina
| | - Ludmila I Ronco
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), CONICET, Güemes 3450, Santa Fe 3000, Argentina.,Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, Santa Fe 3000, Argentina
| | | | - Gregorio Guzmán-González
- POLYMAT University of the Basque Country UPV/EHU, Joxe Mari Korta Center, Avda. Tolosa 72, 20018 Donostia-San Sebastian, Spain
| | | | - Agustina Gugliotta
- UNL, CONICET, FBCB (School of Biochemistry and Biological Sciences), CBL (Biotechnological Center of Litoral), Ciudad Universitaria, Ruta Nacional 168 Km 472.4, C.C. 242., S3000ZAA Santa Fe, Argentina
| | - Liliana C Tomé
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, FCT NOVA, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Luis M Gugliotta
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), CONICET, Güemes 3450, Santa Fe 3000, Argentina.,Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, Santa Fe 3000, Argentina
| | - David Mecerreyes
- POLYMAT University of the Basque Country UPV/EHU, Joxe Mari Korta Center, Avda. Tolosa 72, 20018 Donostia-San Sebastian, Spain.,Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
| | - Roque J Minari
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), CONICET, Güemes 3450, Santa Fe 3000, Argentina.,Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, Santa Fe 3000, Argentina
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4
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Carmona P, Tasici AM, Sande SA, Knudsen KD, Nyström B. Glyceraldehyde as an Efficient Chemical Crosslinker Agent for the Formation of Chitosan Hydrogels. Gels 2021; 7:186. [PMID: 34842656 PMCID: PMC8628775 DOI: 10.3390/gels7040186] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/20/2021] [Accepted: 10/26/2021] [Indexed: 12/05/2022] Open
Abstract
The rheological changes that occur during the chemical gelation of semidilute solutions of chitosan in the presence of the low-toxicity agent glyceraldehyde (GCA) are presented and discussed in detail. The entanglement concentration for chitosan solutions was found to be approximately 0.2 wt.% and the rheological experiments were carried out on 1 wt.% chitosan solutions with various amounts of GCA at different temperatures (25 °C and 40 °C) and pH values (4.8 and 5.8). High crosslinker concentration, as well as elevated temperature and pH close to the pKa value (pH ≈ 6.3-7) of chitosan are three parameters that all accelerate the gelation process. These conditions also promote a faster solid-like response of the gel-network in the post-gel region after long curing times. The mesh size of the gel-network after a very long (18 h) curing time was found to contract with increasing level of crosslinker addition and elevated temperature. The gelation of chitosan in the presence of other chemical crosslinker agents (glutaraldehyde and genipin) is discussed and a comparison with GCA is made. Small angle neutron scattering (SANS) results reveal structural changes between chitosan solutions, incipient gels, and mature gels.
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Affiliation(s)
- Pierre Carmona
- Department of Chemistry, University of Oslo, N-0315 Oslo, Norway;
- Department of Physics, Division of Nano-and BioPhysics, Chalmers University of Technology, Fysikgränd 3, 412 96 Gothenburg, Sweden
| | - Anca M. Tasici
- Department of Pharmacy, Section for Pharmaceutics and Social Pharmacy, University of Oslo, N-0316 Oslo, Norway; (A.M.T.); (S.A.S.)
| | - Sverre A. Sande
- Department of Pharmacy, Section for Pharmaceutics and Social Pharmacy, University of Oslo, N-0316 Oslo, Norway; (A.M.T.); (S.A.S.)
| | | | - Bo Nyström
- Department of Chemistry, University of Oslo, N-0315 Oslo, Norway;
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5
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Mi X, Chang Y, Xu H, Yang Y. Valorization of keratin from food wastes via crosslinking using non-toxic oligosaccharide derivatives. Food Chem 2019; 300:125181. [DOI: 10.1016/j.foodchem.2019.125181] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 06/06/2019] [Accepted: 07/12/2019] [Indexed: 10/26/2022]
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6
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Ghosh A, Grosvenor AJ, Dyer JM. Marine Spongia collagens: Protein characterization and evaluation of hydrogel films. J Appl Polym Sci 2019. [DOI: 10.1002/app.47996] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Arun Ghosh
- Food and Bio‐based Products Group, AgResearch Ltd 1365 Springs Road, Lincoln 7674 New Zealand
| | - Anita J. Grosvenor
- Food and Bio‐based Products Group, AgResearch Ltd 1365 Springs Road, Lincoln 7674 New Zealand
| | - Jolon M. Dyer
- Food and Bio‐based Products Group, AgResearch Ltd 1365 Springs Road, Lincoln 7674 New Zealand
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7
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Modification of peanut protein isolate in glucose-containing solutions during simulated industrial thermal processes and gastric-duodenal sequential digestion. Food Chem 2019; 295:120-128. [DOI: 10.1016/j.foodchem.2019.04.115] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 04/28/2019] [Accepted: 04/29/2019] [Indexed: 11/21/2022]
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8
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Yang B, Hou Z, Sun M, Xu J. Influence of Surfactants on the Microstructure and Performance of PDMS-E Grafted Gelatin Films. RUSS J APPL CHEM+ 2018. [DOI: 10.1134/s1070427218020143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Lu J, Xu D, Wei J, Yan S, Xiao R. Superoleophilic and Flexible Thermoplastic Polymer Nanofiber Aerogels for Removal of Oils and Organic Solvents. ACS APPLIED MATERIALS & INTERFACES 2017; 9:25533-25541. [PMID: 28665576 DOI: 10.1021/acsami.7b07004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Chemical cross-linked poly(vinyl alcohol-co-ethylene) (EVOH) nanofiber aerogels (NFAs) were fabricated employing an economical and facile freeze-drying process. The manufactured chemical cross-linking nanofiber aerogel was successfully confirmed by scanning electron microscopy, attenuated total reflection-Fourier transform infrared spectrometer, and X-ray diffraction. The resulting aerogels showed high porosity (>99%), superior elasticity, elastic durability, high hydrophobicity, and superoleophilicity without any other hydrophobic modification. The cross-linked EVOH NFAs exhibited excellent absorption capacity (ranging from 45 to 102 times their own weight) when exposed to various oils and organic solvents, which was observed to be higher than that for most sorbents reported in the literature. Consequently, it is envisaged that the cross-linked EVOH NFA would play an important role in many fields of pollution removal.
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Affiliation(s)
- Jianwei Lu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University , Shanghai 2016, PR China
| | - Dandan Xu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University , Shanghai 2016, PR China
| | - Junkan Wei
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University , Shanghai 2016, PR China
| | - Shan Yan
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University , Shanghai 2016, PR China
| | - Ru Xiao
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University , Shanghai 2016, PR China
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10
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Geh KJ, Hubert M, Winter G. Optimisation of one-step desolvation and scale-up of gelatine nanoparticle production. J Microencapsul 2016; 33:595-604. [PMID: 27556342 DOI: 10.1080/02652048.2016.1228706] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Gelatine nanoparticles (GNPs) are biodegradable and biocompatible drug delivery systems with excellent clinical performances. A two-step desolvation is commonly used for their preparation, although this methodology has several shortcomings: lack of reproducibility, small scales and low yields. A straightforward and more consistent GNP preparation approach is presented here focusing on the development of a one-step desolvation with the use of a commercially available gelatine type. Controlled stirring conditions and ultrafiltration are used to achieve large-scale production of nanoparticles of up to 2.6 g per batch. Particle size distributions are conserved and comparable to those determined for two-step desolvation on small scale. Additionally, a range of cross-linking agents is examined for their effectiveness in stabilising GNPs as an alternative to glutaraldehyde. Glyceraldehyde demonstrated outstanding properties, which led to high colloidal stability. This approach optimises the manufacturing process and the scale-up of the production capacity, providing a clear potential for future applications.
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Affiliation(s)
- Katharina J Geh
- a Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics , Ludwig-Maximilians Universität München , Munich , Germany
| | - Madlen Hubert
- a Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics , Ludwig-Maximilians Universität München , Munich , Germany
| | - Gerhard Winter
- a Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics , Ludwig-Maximilians Universität München , Munich , Germany
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11
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Xu J, Zhang Y, Zeng L, Liu J, Kinsella JM, Sheng R. A simple naphthalene-based fluorescent probe for high selective detection of formaldehyde in toffees and HeLa cells via aza-Cope reaction. Talanta 2016; 160:645-652. [PMID: 27591661 DOI: 10.1016/j.talanta.2016.08.010] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/26/2016] [Accepted: 08/02/2016] [Indexed: 10/21/2022]
Abstract
A simple naphthalene-based fluorescent probe (AENO) for formaldehyde (FA) was successfully synthesized, which exhibited a significant fluorescence turn-on response towards FA in aqueous solution. The probe could quantitatively determine the concentration of FA (0-1.0mM) with excellent selectivity, high sensitivity and low limit of detection (0.57µM). The sensing mechanism was proposed as 2-aza-Cope rearrangement for AENO after reaction with FA, which was confirmed by (1)H NMR, HR-MS, FT-IR, UV-vis and fluorescence spectra. The probe has been employed to determine the FA contents in several commercially available toffee samples with satisfactory performance. Thus, AENO might be used as a promising tool for quantitative detection of FA in food. Furthermore, fluorescence imaging of HeLa cells indicated that the probe was cell membrane permeable and could be used for visualizing/imaging the FA trace/transportation in cancer cells.
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Affiliation(s)
- Junchao Xu
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin, 300384 PR China
| | - Yue Zhang
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin, 300384 PR China
| | - Lintao Zeng
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin, 300384 PR China.
| | - Jinbiao Liu
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin, 300384 PR China
| | - Joseph M Kinsella
- Department of Bioengineering, McGill University, 817 Sherbrook Street, Montreal, Quebec, Canada H3A0C3
| | - Ruilong Sheng
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032 PR China; Department of Chemistry, Université de Montréal, Succursale Centre-ville, Montreal, Quebec, Canada H3C3J7.
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12
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The Effects of Scleral Collagen Cross-Linking Using Glyceraldehyde on the Progression of Form-Deprived Myopia in Guinea Pigs. J Ophthalmol 2016; 2016:3526153. [PMID: 27504195 PMCID: PMC4967684 DOI: 10.1155/2016/3526153] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 06/19/2016] [Indexed: 12/04/2022] Open
Abstract
To investigate the effects of collagen cross-linking using glyceraldehyde on the biomechanical properties of the sclera and the axial elongation of form-deprived myopia in the guinea pig. Thirty-six guinea pigs were randomly assigned to four groups: FDM (form-deprived myopia); FDMG (form-deprived myopia treated with glyceraldehyde); FDMS (form-deprived myopia treated with 0.9% isotonic sodium chloride); and normal control (free of form-deprivation). FDM was achieved in the right eye using a latex facemask. The right eye in FDMG was treated with a posterior subtenon injection of 0.5 M glyceraldehyde; 0.9% isotonic sodium chloride was administered to the right eye in FDMS group using the same method. Axial length, refraction, and stress-strain of the sclera were measured at scheduled time points. The treated eyes were also examined histologically by light microscopy. It was found that glyceraldehyde treatment significantly increased the stiffness of the sclera in the FDM eyes and abnormalities have not been observed in the retina and optic nerve of the treated eyes. But the development of myopia was not affected.
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13
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Azeredo HM, Waldron KW. Crosslinking in polysaccharide and protein films and coatings for food contact – A review. Trends Food Sci Technol 2016. [DOI: 10.1016/j.tifs.2016.04.008] [Citation(s) in RCA: 191] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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14
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Protein Modification During Ingredient Preparation and Food Processing: Approaches to Improve Food Processability and Nutrition. FOOD BIOPROCESS TECH 2014. [DOI: 10.1007/s11947-014-1326-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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15
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Monti S, Bramanti E, Porta VD, Onor M, D'Ulivo A, Barone V. Interaction of collagen with chlorosulphonated paraffin tanning agents: Fourier transform infrared spectroscopic analysis and molecular dynamics simulations. Phys Chem Chem Phys 2013; 15:14736-47. [DOI: 10.1039/c3cp52404c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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16
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Rombouts I, Lagrain B, Brijs K, Delcour JA. Polymerization Reactions of Wheat Gluten: The Pretzel Case. CEREAL FOOD WORLD 2012. [DOI: 10.1094/cfw-57-5-0203] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- I. Rombouts
- Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Katholieke Universiteit Leuven, Leuven, Belgium
| | - B. Lagrain
- Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Katholieke Universiteit Leuven, Leuven, Belgium
| | - K. Brijs
- Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Katholieke Universiteit Leuven, Leuven, Belgium
| | - J. A. Delcour
- Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Katholieke Universiteit Leuven, Leuven, Belgium
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17
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18
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Aspects of physical and chemical alterations to proteins during food processing – some implications for nutrition. Br J Nutr 2012; 108 Suppl 2:S288-97. [DOI: 10.1017/s000711451200236x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In this paper, we give an overview of our research exploring the impact of physical and chemical processing on food proteins. There are three themes, applied to the proteins of wheat, soya, egg and dairy foods. Firstly, the impact of the Maillard reaction on food proteins is discussed, with a particular focus on how the reactions might be harnessed to manipulate food texture. Secondly, the potential of enzymatic protein-protein crosslinking is considered, especially the enzyme transglutaminase. Thirdly, the broader question of how the aggregation of proteins within a food is altered by chemical and physical modification and how, in turn, this might impact on the overall nutritional quality of the food is considered.
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19
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Dinu CZ, Borkar IV, Bale SS, Campbell AS, Kane RS, Dordick JS. Perhydrolase-nanotube-paint sporicidal composites stabilized by intramolecular crosslinking. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcatb.2011.11.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Li Y, Yang Y. Formaldehyde-Free Chemical and Enzymatic Crosslinking of Plant Proteins. ACTA ACUST UNITED AC 2011. [DOI: 10.1108/rjta-15-04-2011-b001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Nasiri R, Zahedi M, Jamet H, Moosavi-Movahedi AA. Theoretical studies on models of lysine-arginine cross-links derived from α-oxoaldehydes: a new mechanism for glucosepane formation. J Mol Model 2011; 18:1645-59. [DOI: 10.1007/s00894-011-1161-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Accepted: 06/21/2011] [Indexed: 11/30/2022]
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22
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Wollensak G. Thermomechanical stability of sclera after glyceraldehyde crosslinking. Graefes Arch Clin Exp Ophthalmol 2010; 249:399-406. [DOI: 10.1007/s00417-010-1504-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2010] [Revised: 07/28/2010] [Accepted: 08/26/2010] [Indexed: 11/24/2022] Open
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23
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Pojanavaraphan T, Magaraphan R, Chiou BS, Schiraldi DA. Development of Biodegradable Foamlike Materials Based on Casein and Sodium Montmorillonite Clay. Biomacromolecules 2010; 11:2640-6. [DOI: 10.1021/bm100615a] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tassawuth Pojanavaraphan
- Polymer Processing and Polymer Nanomaterials Research Unit, The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand, Bioproduct Chemistry and Engineering, USDA/WRRC/ARS, 800 Buchanan Street, Albany, California 94710, and Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202
| | - Rathanawan Magaraphan
- Polymer Processing and Polymer Nanomaterials Research Unit, The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand, Bioproduct Chemistry and Engineering, USDA/WRRC/ARS, 800 Buchanan Street, Albany, California 94710, and Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202
| | - Bor-Sen Chiou
- Polymer Processing and Polymer Nanomaterials Research Unit, The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand, Bioproduct Chemistry and Engineering, USDA/WRRC/ARS, 800 Buchanan Street, Albany, California 94710, and Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202
| | - David A. Schiraldi
- Polymer Processing and Polymer Nanomaterials Research Unit, The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand, Bioproduct Chemistry and Engineering, USDA/WRRC/ARS, 800 Buchanan Street, Albany, California 94710, and Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202
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Zhang X, Do MD, Casey P, Sulistio A, Qiao GG, Lundin L, Lillford P, Kosaraju S. Chemical cross-linking gelatin with natural phenolic compounds as studied by high-resolution NMR spectroscopy. Biomacromolecules 2010; 11:1125-32. [PMID: 20235576 DOI: 10.1021/bm1001284] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cross-linking gelatin with natural phenolic compound caffeic acid (CA) or tannic acid (TA) above pH 9 resulted in formation of insoluble hydrogels. The cross-linking reactivity was controlled by variation of pH, the concentration of the gelatin solution, or the amount of CA or TA used in the reaction. The cross-linking chemistry was studied by high-resolution NMR technique in both solution and solid state via investigation on small molecular model systems or using (13)C enriched caffeic acid (LCA) in the reaction with gelatin. Direct evidence was obtained to confirm the chemical reactions occurring between the phenolic reactive sites of the phenolic compounds and the amino groups in gelatin to form C-N covalent bonds as cross-linking linkages in gelatin matrix. The cross-linked network was homogeneous on a scale of 2-3 nm. The cross-linking resulted in a significant decrease in the molecular mobility of the hydrogels, while the modulus of the films remained at high values at high temperatures.
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Affiliation(s)
- Xiaoqing Zhang
- CSIRO Materials Science and Engineering, Private Bag 33, Clayton South MDC, Clayton South, Victoria 3169, Australia.
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Flocea P, Verestiuc L, Popa M, Sunel V, Lungu A. Crosslinked Networks Based on Polysaccharides and Collagen for Pilocarpine Sustained Release. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2010. [DOI: 10.1080/10601321003742196] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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26
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Buchert J, Ercili Cura D, Ma H, Gasparetti C, Monogioudi E, Faccio G, Mattinen M, Boer H, Partanen R, Selinheimo E, Lantto R, Kruus K. Crosslinking Food Proteins for Improved Functionality. Annu Rev Food Sci Technol 2010; 1:113-38. [DOI: 10.1146/annurev.food.080708.100841] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Johanna Buchert
- VTT Technical Research Center of Finland, Espoo, FI-02044 Finland;
| | | | - Hairan Ma
- VTT Technical Research Center of Finland, Espoo, FI-02044 Finland;
| | | | | | - Greta Faccio
- VTT Technical Research Center of Finland, Espoo, FI-02044 Finland;
| | - Maija Mattinen
- VTT Technical Research Center of Finland, Espoo, FI-02044 Finland;
| | - Harry Boer
- VTT Technical Research Center of Finland, Espoo, FI-02044 Finland;
| | - Riitta Partanen
- VTT Technical Research Center of Finland, Espoo, FI-02044 Finland;
| | | | - Raija Lantto
- VTT Technical Research Center of Finland, Espoo, FI-02044 Finland;
| | - Kristiina Kruus
- VTT Technical Research Center of Finland, Espoo, FI-02044 Finland;
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Gan CY, Latiff AA, Cheng LH, Easa AM. Gelling of microbial transglutaminase cross-linked soy protein in the presence of ribose and sucrose. Food Res Int 2009. [DOI: 10.1016/j.foodres.2009.07.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Sisson K, Zhang C, Farach-Carson MC, Chase DB, Rabolt JF. Evaluation of cross-linking methods for electrospun gelatin on cell growth and viability. Biomacromolecules 2009; 10:1675-80. [PMID: 19456101 DOI: 10.1021/bm900036s] [Citation(s) in RCA: 193] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The creation of a tissue engineering scaffold via electrospinning that has minimal toxicity and uses a solvent system composed of solvents with low toxicity and different cross-linking agents was investigated. First, a solvent system of acetic acid/ethyl acetate/water (50:30:20) with gelatin as a solute was evaluated. The optimum system for electrospinning a scaffold with the desired properties resulted from a gelatin concentration of 10 wt %. Several different methods were used to cross-link the electrospun gelatin fibers, including vapor-phase glutaraldehyde, aqueous phase genipin, and glyceraldehyde, as well as reactive oxygen species from a plasma cleaner. Because glutaraldehyde at high concentrations has been shown to be toxic, we explored other cross-linking methods. Using reactive oxygen species from a plasma cleaner is an easy alternative; however, the degradation reaction dominated the cross-linking reaction and the scaffolds degraded after only a few hours in aqueous medium at 37 °C. Glyceraldehyde and genipin were established as good options for cross-linking agents because of the low toxicity of these cross-linkers and the resistance to dissolution of the cross-linked fibers in cell culture medium at 37 °C. MG63 osteoblastic cells were grown on each of the cross-linked scaffolds. A proliferation assay showed that the cells proliferated as well or better on the cross-linked scaffolds than on traditional two-dimensional polystyrene culture plates.
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Affiliation(s)
- Kristin Sisson
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, USA
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29
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Ghosh A, Ali MA, Dias GJ. Effect of Cross-Linking on Microstructure and Physical Performance of Casein Protein. Biomacromolecules 2009; 10:1681-8. [DOI: 10.1021/bm801341x] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arun Ghosh
- AgResearch Limited, Lincoln Research Centre, Springs Road and Gerald Street, Lincoln, Canterbury 8140, New Zealand, and Department of Anatomy and Structural Biology, University of Otago, 270 Great King Street, Dunedin 9016, New Zealand
| | - M. Azam Ali
- AgResearch Limited, Lincoln Research Centre, Springs Road and Gerald Street, Lincoln, Canterbury 8140, New Zealand, and Department of Anatomy and Structural Biology, University of Otago, 270 Great King Street, Dunedin 9016, New Zealand
| | - George J. Dias
- AgResearch Limited, Lincoln Research Centre, Springs Road and Gerald Street, Lincoln, Canterbury 8140, New Zealand, and Department of Anatomy and Structural Biology, University of Otago, 270 Great King Street, Dunedin 9016, New Zealand
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Wollensak G, Iomdina E. Long-term biomechanical properties after collagen crosslinking of sclera using glyceraldehyde. Acta Ophthalmol 2008; 86:887-93. [PMID: 18537936 DOI: 10.1111/j.1755-3768.2007.01156.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
PURPOSE Chemical crosslinking by glyceraldehyde has been shown to increase significantly the biomechanical rigidity of sclera. It might therefore become an option for a sclera-based treatment of progressive myopia. The present pilot study was designed to test the long-term biomechanical efficiency of the new crosslinking method. METHODS Six Chinchilla rabbits were treated with sequential sub-Tenon's injections of 0.15 ml 0.5 m glyceraldehyde, which were given in the supero-nasal quadrant of the right eye (OD) five times over 14 days. The rabbits were killed 4 months and 8 months after crosslinking treatment, respectively. Biomechanical stress-strain measurements of scleral strips from the treatment area were performed and compared to non-treated contralateral control sclera using a microcomputer-controlled biomaterial testing device. In addition, the eyes were examined histologically by light microscopy to evaluate possible side-effects. RESULTS Following the crosslinking treatment, the ultimate stress was 10.2 +/- 2.3 MPa after 4 months and 8.5 +/- 2.2 MPa after 8 months versus 2.4 +/- 0.3 MPa in the controls (increases of 325% and 254.17%, respectively); Young's modulus was 104.6 +/- 13.7 MPa after 4 months and 53.2 +/- 5.2 MPa after 8 months versus 9.6 +/- 1.3 MPa in the controls (increases of 989.6% and 554.17%, respectively); and ultimate strain was 15.8 +/- 1.5% after 4 months and 24.1 +/- 0.7% after 8 months versus 38.4 +/- 4.6% in the controls (decreases of 58.84% and 37.24%, respectively). Histologically, no side-effects were found. CONCLUSION Our new method of scleral collagen crosslinking proved very efficient in increasing scleral biomechanical strength over a period of up to 8 months. Glyceraldehyde can be applied easily by sequential parabulbar injections. Before clinical application in myopic patients, a study in an animal myopia model is recommended.
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Affiliation(s)
- Gregor Wollensak
- Department of Ophthalmology, Martin-Luther-University, Halle, Germany.
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Sessa DJ, Mohamed A, Byars JA. Chemistry and physical properties of melt-processed and solution-cross-linked corn zein. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:7067-7075. [PMID: 18636736 DOI: 10.1021/jf800712k] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Corn zein was cross-linked with glutaraldehyde (GDA) using glacial acetic acid (HAc) as catalyst. The objectives are to evaluate the swelling characteristics of GDA cross-linked zein gels in water, ethanol, and their combinations. Similar formulations, upon solvent evaporation, form films. The mechanical properties of the films are compared to compression molded tensile bars from GDA melt-processed zein as a second objective. Chemistry of the cross-linking reaction was based on the aldehyde binding characteristics defined by use of fluorescence spectroscopy; sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) to demonstrate the cross-linking reaction; FTIR to observe absorption differences of the cross-linked product; differential scanning calorimetry, dynamic mechanical analysis and thermogravimetric analysis to assess thermal properties; and the use of Instron Universal Testing Machine to evaluate mechanical properties. A reaction mechanism for acid catalyzed GDA cross-linking of zein is proposed. Thermal and mechanical properties of tensile bars cut from either film or formed by compression molding were similar, where both showed increased tensile strengths, ductility and stiffness when compared with unmodified controls. Samples that were reacted with 8% GDA by weight based on weight of zein from either process retained their integrity when tensile bars from each were subjected to boiling water for 10 min or soaking in either water or HAc for 24 h. The melt-processed, cross-linked zein is a more environmentally friendly method that would eliminate the need for HAc recovery.
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Affiliation(s)
- David J Sessa
- Plant Polymer Research Unit, National Center for Agricultural Utilization Research, United States Department of Agriculture, Agricultural Research Service, 1815 North University Street, Peoria, Illinois 61604, USA.
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Caillard R, Remondetto G, Mateescu M, Subirade M. Characterization of Amino Cross-Linked Soy Protein Hydrogels. J Food Sci 2008; 73:C283-91. [DOI: 10.1111/j.1750-3841.2008.00780.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wollensak G, Redl B. Gel electrophoretic analysis of corneal collagen after photodynamic cross-linking treatment. Cornea 2008; 27:353-6. [PMID: 18362667 DOI: 10.1097/ico.0b013e31815cf66a] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE Photodynamic collagen cross-linking by using ultraviolet A (UVA) irradiation and the photosensitizer riboflavin has been recently introduced as a new possible treatment of progressive keratoconus. This is the first study, to our knowledge, investigating biochemical aspects of the new procedure. Its aim was to analyze the possible changes in the electrophoretic pattern of corneal collagen type I after collagen cross-linking treatment. METHODS Twenty fresh postmortem porcine corneas were cross-linked; another 20 porcine corneas treated with physiologic saline were used as controls. After removal of the central 10 mm of the epithelium, the corneas were treated with the photosensitizer riboflavin and UVA irradiation for 30 minutes by using a double UVA diode (370 nm, 3 mW/cm). For biochemical analysis, the central 10-mm corneal buttons were trephined, tissue was homogenized, and collagen type I was extracted. Subsequently, the collagen extracts were separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. RESULTS In the controls, the typical collagen pattern of normal cornea was found with 1 gamma trimer band, 2 beta dimer bands, and 2 alpha monomer bands. In the cross-linked samples, there was an additional intense polymer band in the stacking gel that was resistant to mercaptoethanol, heat, and pepsin treatment. Its molecular size was estimated to be at least 1000 kDa. CONCLUSIONS In the cross-linked corneas, a strong band of high-molecular-weight collagen polymers was shown as the biochemical correlate of the cross-linking effect, showing the efficiency of the new cross-linking procedure. This polymer band complies well with the morphologic correlate of an increased fiber diameter after cross-linking treatment. Its chemical stability supports hopes of a long-term effect of the new treatment.
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Affiliation(s)
- Gregor Wollensak
- Department of Ophthalmology, Vivantes-Klinikum Neukölln, Berlin, Germany.
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Wollensak G, Iomdina E. Crosslinking of scleral collagen in the rabbit using glyceraldehyde. J Cataract Refract Surg 2008; 34:651-6. [PMID: 18361989 DOI: 10.1016/j.jcrs.2007.12.030] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2007] [Accepted: 12/06/2007] [Indexed: 10/22/2022]
Abstract
PURPOSE To strengthen rabbit sclera in vivo using chemical crosslinking with glyceraldehyde for a scleral-based treatment of progressive myopia. SETTING Department of Ophthalmology, Martin-Luther-University, Halle, Germany. METHODS Five chinchilla rabbits were treated with sequential sub-Tenon injections of 0.15 mL 0.5 M glyceraldehyde into the superonasal quadrant of the right eye 5 times during 14 days. The rabbits were humanely killed and biomechanical stress-strain measurements of scleral strips from the treatment area were performed and compared with nontreated contralateral control sclera using a microcomputer-controlled biomaterial tester. The treated eyes were examined histologically by light microscopy to exclude possible adverse effects. RESULTS Following the crosslinking treatment, the ultimate stress was 15.8 MPa +/- 6.0 (SD) versus 3.1 +/- 0.3 MPa in the controls (increase of 409.7%; P<.02), the Young modulus was 129.6 +/- 53.7 MPa versus 11.5 +/- 1.8 MPa in the controls (increase of 1027%, P<.01), and ultimate strain was 19.8% +/- 2.6% MPA versus 38.2% +/- 5.1% MPA in the controls (decrease of 48.2% P<.05). Histologically, mild side effects were found in the peripheral cornea adjacent to the treatment area, with some inflammatory infiltrate and moderate loss of keratocytes. CONCLUSIONS Glyceraldehyde crosslinking of scleral collagen increased the scleral biomechanical rigidity efficiently. Glyceraldehyde can be easily applied by sequential parabulbar injections. There were no side effects on the retina, so the new method might become a treatment modality for strengthening scleral tissue to prevent progressive myopia.
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Affiliation(s)
- Gregor Wollensak
- Department of Ophthalmology, Martin-Luther-University, Halle, Germany.
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Todorova SB, Silva CJ, Simeonov NP, Cavaco-Paulo A. Cotton fabric: A natural matrix suitable for controlled release systems. Enzyme Microb Technol 2007. [DOI: 10.1016/j.enzmictec.2007.02.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Romoscanu AI, Mezzenga R. Emulsion-templated fully reversible protein-in-oil gels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:7812-8. [PMID: 16922568 DOI: 10.1021/la060878p] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We have developed a new method allowing us to transform low-viscous apolar fluids into elastic solids with a shear elastic modulus of the order of 10(3)-10(5) Pa. The elasticity of the elastic solid is provided by a percolating 3D network of proteins, which are originally adsorbed at the interface of an oil-in-water emulsion template. By cross-linking the protein films at the interface and upon removal of water, the template is driven into a structure resembling a dry foam where the protein interfaces constitute the walls of the foam and the air is replaced by oil confined within polyhedral, closely packed droplets. Depending on the density of the protein network, the final material consists of chemically unmodified oil in a proportion of 95 to 99.9%. The physical properties of the elastic solid obtained can be tuned by changing either the average diameter size of the emulsion template or the cross-linking process of the protein film. However, the original low-viscosity emulsion can be restored by simply rehydrating the solidified fluid. Therefore, the present procedure offers an appealing strategy to build up solid properties for hydrophobic liquids while preserving the low viscosity and ease of manufacturing.
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37
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Howell N. Interaction of Proteins with Selected Small Molecules. FOOD SCIENCE AND TECHNOLOGY 2005. [DOI: 10.1201/9781420028133.ch9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Chen JP, Yang L. Chemical Modification ofSargassum sp. for Prevention of Organic Leaching and Enhancement of Uptake during Metal Biosorption. Ind Eng Chem Res 2005. [DOI: 10.1021/ie050678t] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Romoscanu AI, Mezzenga R. Cross linking and rheological characterization of adsorbed protein layers at the oil-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:9689-97. [PMID: 16207053 DOI: 10.1021/la051241t] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The dilatational rheological properties of cross-linked protein layers adsorbed at the oil-water interface were investigated with help of a modified drop tensiometer allowing successive replacements of the external phase. This setup enables one to perform cross-linking reactions at the interface only, that is, without any contact between the cross-linking agent and protein molecules in solution, under continuous monitoring of the interfacial tension. The mechanical properties of the resulting interface were investigated with dilatational large strain experiments. Measured rheological properties were related to the expected stability of an emulsion against disproportionation by considering the ratio of the interfacial elasticity to the interfacial tension. In an attempt to increase this ratio to improve the resistance against disproportionation, experiments were performed with densified protein layers obtained via reduction of the droplet area prior to cross linking. To highlight the influence of the protein morphology on the dilatational rheological properties of the cross-linked adsorbed layers, experiments were performed with random coil (beta-casein) as well as globular (beta-lactoglobulin) proteins. Glutaraldehyde was used as a cross-linking agent. Experiments were performed at 55 degrees C and pH 7.0 in 20 mM imidazole buffer for later comparison with enzymatically cross-linked adsorbed protein layers. The present work demonstrated substantial qualitative and quantitative differences in the interfacial rheological properties of cross-linked random coil and globular proteins.
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Viljanen K, Kylli P, Hubbermann EM, Schwarz K, Heinonen M. Anthocyanin antioxidant activity and partition behavior in whey protein emulsion. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2005; 53:2022-2027. [PMID: 15769130 DOI: 10.1021/jf047975d] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The antioxidant activities of anthocyanins and anthocyanin fractions isolated from blackcurrants, raspberries, and lingonberries were investigated in whey protein-stabilized emulsion. The extent of protein oxidation was measured by determining the loss of tryptophan fluorescence and formation of protein carbonyl compounds and that of lipid oxidation by conjugated diene hydroperoxides and hexanal analyses. The antioxidant activity of berry anthocyanins increased with an increase in concentration. Blackcurrant anthocyanins were the most potent antioxidants toward both protein and lipid oxidation at all concentrations due to the beneficial combination of delphinidin and cyanidin glycosides. Most berry anthocyanins (69.4-72.8%) partitioned into the aqueous phase of the emulsion, thus being located favorably for antioxidant action toward protein oxidation. The presence of the lipid decreased the share of anthocyanin in the aqueous phase. Thus, the structure of food affects the antioxidant activity by influencing the partitioning of the antioxidant.
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Affiliation(s)
- Kaarina Viljanen
- Department of Applied Chemistry and Microbiology, Division of Food Chemistry, University of Helsinki, P.O. Box 27, FIN-00014 Helsinki, Finland.
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Rasiah I, Sutton K, Low F, Lin HM, Gerrard J. Crosslinking of wheat dough proteins by glucose oxidase and the resulting effects on bread and croissants. Food Chem 2005. [DOI: 10.1016/j.foodchem.2004.02.052] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Viljanen K, Kylli P, Kivikari R, Heinonen M. Inhibition of protein and lipid oxidation in liposomes by berry phenolics. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2004; 52:7419-7424. [PMID: 15563229 DOI: 10.1021/jf049198n] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The antioxidant activity of berry phenolics (at concentrations of 1.4, 4.2, and 8.4 mug of purified extracts/mL of liposome sample) such as anthocyanins, ellagitannins, and proanthocyanidins from raspberry (Rubus idaeus), bilberry (Vaccinium myrtillus), lingonberry (Vaccinium vitis-idaea), and black currant (Ribes nigrum) was investigated in a lactalbumin-liposome system. The extent of protein oxidation was measured by determining the loss of tryptophan fluorescence and formation of protein carbonyl compounds and that of lipid oxidation by conjugated diene hydroperoxides and hexanal analyses. The antioxidant protection toward lipid oxidation was best provided by lingonberry and bilberry phenolics followed by black currant and raspberry phenolics. Bilberry and raspberry phenolics exhibited the best overall antioxidant activity toward protein oxidation. Proanthocyanidins, especially the dimeric and trimeric forms, in lingonberries were among the most active phenolic constituents toward both lipid and protein oxidation. In bilberries and black currants, anthocyanins contributed the most to the antioxidant effect by inhibiting the formation of both hexanal and protein carbonyls. In raspberries, ellagitannins were responsible for the antioxidant activity. While the antioxidant effect of berry proanthocyanidins and anthocyanins was dose-dependent, ellagitannins appeared to be equally active at all concentrations. In conclusion, berries are rich in monomeric and polymeric phenolic compounds providing protection toward both lipid and protein oxidation.
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Affiliation(s)
- Kaarina Viljanen
- Department of Applied Chemistry and Microbiology, Division of Food Chemistry, University of Helsinki, P.O. Box 27, FIN-00014 Helsinki, Finland.
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Jing H, Kitts DD. Chemical characterization of different sugar-casein Maillard reaction products and protective effects on chemical-induced cytotoxicity of Caco-2 cells. Food Chem Toxicol 2004; 42:1833-44. [PMID: 15350681 DOI: 10.1016/j.fct.2004.06.019] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2003] [Accepted: 06/18/2004] [Indexed: 11/21/2022]
Abstract
This study examined the chemical modification of casein with three monosaccharides [e.g., glucose (Glc), fructose (fru), and ribose (Rib)], following prolonged gentle heating to product the Maillard reaction (MR). Changes in chemical modification of casein in different sugar-casein MR was monitored using temporal patters of change in fluorescence development, UV absorbance and casein molecular mass, which was studied using SDS-PAGE and MALDI-TOF mass spectrometry. Rib-casein MRP exhibited significantly (p<0.05) advanced fluorescence development at three days, compared to Glc- and Fru-casein MRPs, which corresponded to marked (p<0.05) differences in greater UV absorption of Rib-casein MRPs later on after 15 days of processing. These results were associated with the generation of different high molecular weight complexes generated from the Rib-casein MR, compared to Glu- and Fru-casein MRPs, respectively. Antioxidant activity of all three sugar-modified caseins was also assessed when cultured with Caco-2 cells. A significant, but similar protective effect against 2,2'-azobis-(2-amidinopropane)dihydrochloride (AAPH) radical-induced cytotoxicity, and ferrous- and cupric-induced toxicity of Caco-2 cells was observed for all three sugar-casein MRPs. However, these protective effects were not significantly different among the sugar-modified caseins and native casein. The results suggest that protection of Caco-2 cells from free radical-ferrous- and cupric-induced cytotoxicity by casein was not altered by modification by MR, regardless of source of monosaccharide involved in the reaction.
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Affiliation(s)
- Hao Jing
- Department of Food, Nutrition and Health, Faculty of the Agricultural Sciences, The University of British Columbia, 6640 N.W. Marine Drive, Vancouver, BC, Canada V6T 1Z4
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Viljanen K, Kivikari R, Heinonen M. Protein-lipid interactions during liposome oxidation with added anthocyanin and other phenolic compounds. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2004; 52:1104-1111. [PMID: 14995106 DOI: 10.1021/jf034785e] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Oxidation of bovine serum albumin, casein, and lactalbumin and the effect of different procyanidins, anthocyanins, and their aglycons (10 and 20 microM) on lactalbumin oxidation were investigated in a liposome system. Samples were incubated in the dark at 37 degrees C with copper, and the extent of oxidation was measured by determining the loss of tryptophan fluorescence and the formation of protein carbonyls, conjugated diene hydroperoxides, and hexanal. The correlation between different protein and lipid oxidation measurements was good and statistically significant. Casein was the most stable protein in the liposome model, and it was also the best inhibitor of liposome oxidation. All tested anthocyanins and other phenolic compounds inhibited both lipid and protein oxidation. There were no systematic differences with anthocyanins and their aglycons in relation to the concentrations used or glycosylation with either glucose or rutinose. Procyanidins B1 and B2 and ellagic acid were potentially better antioxidants than anthocyanins due to their several hydroxyl groups as measured by both protein and lipid oxidation. In conclusion, oxidative deterioration of liposomes due to protein-lipid interaction is inhibited by anthocyanins, procyanidins, and ellagitannin present, for example, in berries.
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Affiliation(s)
- Kaarina Viljanen
- Department of Applied Chemistry and Microbiology, Division of Food Chemistry, University of Helsinki, P.O. Box 27, FIN-00014 Helsinki, Finland.
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Meade SJ, Miller AG, Gerrard JA. The role of dicarbonyl compounds in non-enzymatic crosslinking: a structure-activity study. Bioorg Med Chem 2003; 11:853-62. [PMID: 12614870 DOI: 10.1016/s0968-0896(02)00564-3] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The Maillard reaction is a complex network of reactions that has been shown to result in the non-enzymatic crosslinking of proteins. Recent attention has focussed on the role of alpha-dicarbonyl compounds as important in vivo contributors to protein crosslinking but, despite extensive research, the molecular mechanisms of the crosslinking reaction remain open to conjecture. In particular, no relationship between the structure of the carbonyl-containing compounds and their activity as crosslinking agents has been established. In an effort to elucidate a structure-reactivity relationship, a wide range of dicarbonyl compounds, including linear, cyclic, di-aldehyde and di-ketone compounds, were reacted with the model protein ribonuclease A and their crosslinking activity assessed. Methylglyoxal and glutaraldehyde were found to be the most efficient crosslinkers, whilst closely related molecules effected crosslinking at a much lower rate. Cyclopentan-1,2-dione was also shown to be a reactive crosslinking agent. The efficiency of methylglyoxal and glutaraldehyde at crosslinking is thought to be related to their ability to form stable heterocyclic compounds that are the basis of protein crosslinks. The reasons for the striking reactivity of these two compounds, compared to closely related structures is explained by subtle balances between competing pathways in a complex reaction network.
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Affiliation(s)
- Susie J Meade
- Department of Plant and Microbial Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
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