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Chen N, Zhang J, Mei L, Wang Q. Ionic Strength and pH Responsive Permeability of Soy Glycinin Microcapsules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9711-9718. [PMID: 30045619 DOI: 10.1021/acs.langmuir.8b01559] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Recently, hollow protein microcapsules have been made simply by heating the microphase separated soy glycinin microdomains. However, the properties (e.g., mechanical properties and permeability) that relate to the application of these microcapsules are unknown. In this study, the permeability of the soy glycinin microcapsules was investigated by confocal laser scanning microscopy (CLSM), as influenced by ionic strength and pH using fluorescein isothiocyanate-dextran (FITC-dextran). The glycinin microcapsules kept the integrity between pH 1 and 11.5, swelled when pH was below 3 or above pH 11, dissociated at pH above 11.5 and deswelled slightly at pH 1. When the pH increased above 11, the permeability of the microcapsule significantly increased. Remarkably, when the pH was below the isoelectric point of glycinin (≈pH 5), FITC-dextran spontaneously accumulated inside the microcapsule with a significantly higher concentration than that in bulk solution, as evidenced by the strong intensity increase of fluorescence. This unique feature significantly increased the loading amount of FITC-dextran. The permeability of microcapsules was also increased by adding salt but less significant than by adjusting pH. The surface of the microcapsules became coarser when the permeability increased, which was revealed by scanning electron microscopy. These results show that soy glycinin has a great potential to be used as a wall material to fabricate hollow microcapsules that could find applications in biomedicine and food industry.
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Affiliation(s)
- Nannan Chen
- Department of Nutrition and Food Science, University of Maryland , College Park , Maryland 20742 , United States
| | - Jinglin Zhang
- Department of Nutrition and Food Science, University of Maryland , College Park , Maryland 20742 , United States
| | - Lei Mei
- Department of Nutrition and Food Science, University of Maryland , College Park , Maryland 20742 , United States
| | - Qin Wang
- Department of Nutrition and Food Science, University of Maryland , College Park , Maryland 20742 , United States
- College of Food and Bio-engineering , Xihua University , Chengdu 610039 , China
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Li L, Lv HT, Deng RP, Liao ZK, Wu XE, Chen XD. Experimental investigation of egg ovalbumin scaling on heated stainless steel surface and scale-removal compared with that of whey protein. Colloids Surf B Biointerfaces 2013; 107:198-204. [DOI: 10.1016/j.colsurfb.2013.01.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 01/25/2013] [Accepted: 01/28/2013] [Indexed: 10/27/2022]
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Mirčeski V, Guziejewski D, Ciesielski W. Theoretical Treatment of a Cathodic Stripping Mechanism of an Insoluble Salt Coupled with a Chemical Reaction in Conditions of Square Wave Voltammetry. Application to 6-Mercaptopurine-9-D-Riboside in the Presence of Ni(II). ELECTROANAL 2011. [DOI: 10.1002/elan.201000720] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Giannakopoulos E, Deligiannakis Y. Thermodynamics of adsorption of dithiocarbamates at the hanging mercury drop. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:2453-62. [PMID: 17249700 DOI: 10.1021/la062147v] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Two dimethyldithiocarbamate (DMDTC) pesticides, thiram and ziram, are adsorbed onto a Hg drop via an entropically driven process. The adsorption isotherms are described by the Frumkin equation. For both molecules, the adsorption is characterized by a nonlinear pseudosigmoid temperature dependence of the Gibbs free energy. For the temperature range of 273-313 K, DeltaGADS varies between -43.4 and -56.71 kJ/mol for thiram and -42.60 and -55.67 kJ/mol for ziram. This variation of DeltaGADS reveals that the adsorption strength is increased at higher temperatures. During the adsorption of either molecule, strong lateral interactions are developed between neighboring adsorbates, which are severely weakened as the temperature increases. A unified reaction scheme is suggested for both ziram and thiram that predicts the formation and adsorption of a surface complex, (DMDTC)2Hg. In the case of thiram, two DMDTC molecules are formed by the cleavage of the disulfide S-S bond near the Hg electrode. The thermodynamic and structural parameters reveal that there are two limiting thermodynamic regimes for the adsorbed (DMDTC)2Hg species that originate from two limiting adsorption conformations of the adsorbates on the Hg surface. A transition occurs between these two conformations at temperatures in the region of 285-295 K. This transition is accompanied by large entropic and enthalpic changes.
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Affiliation(s)
- Evangelos Giannakopoulos
- Lab of Physical Chemistry, Department of Environmental & Natural Resources Management, University of Ioannina, Seferi 2, 30100 Agrinio, Greece
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Mercadé-Prieto R, Falconer RJ, Paterson WR, Wilson DI. Effect of gel structure on the dissolution of heat-induced beta-lactoglobulin gels in alkali. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2006; 54:5437-44. [PMID: 16848529 DOI: 10.1021/jf0605650] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The dissolution of heat-induced beta-lactoglobulin (betaLg) gels in alkaline solution plays an important role in the cleaning-in-place of fouled dairy and other food plants. The dissolution behavior is strongly influenced by the conditions under which the gel is formed. At low alkaline pH values (<13), the dissolution rate constant kg' decreases with longer gelation time and higher temperature. An inverse relationship is observed between the kg' value and the amount of covalently cross-linked proteins in the gel, which is mainly due to disulfide bonds. beta-Elimination kinetics of intramolecular cystines in betaLg have been used to estimate the amount of intermolecular disulfide bonds that are cleaved during dissolution. The results call into question current dissolution models for these systems based on external mass transfer through the fluid next to the swollen gel. At low temperatures, the amount of disulfide cleavage is estimated to be small, indicating that dissolution is likely to involve the (slow) disengagement of large protein clusters, analogous to the dissolution of synthetic polymers.
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Affiliation(s)
- Ruben Mercadé-Prieto
- Department of Chemical Engineering, University of Cambridge, Cambridge, Pembroke Street, CB2 3RA, United Kingdom
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Spãtaru N, Sarada BV, Popa E, Tryk DA, Fujishima A. Voltammetric determination of L-cysteine at conductive diamond electrodes. Anal Chem 2001; 73:514-9. [PMID: 11217755 DOI: 10.1021/ac000220v] [Citation(s) in RCA: 172] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Boron-doped diamond (BDD) electrodes were used to examine L-cysteine (CySH) oxidation in alkaline media. The results of the voltammetric and polarization measurements showed that at BDD electrodes the overall CySH oxidation reaction is controlled by the initial electrochemical step, i.e., the oxidation of the CyS- electroactive species. The same conclusion was supported by the results of a study of pH effects. Conversely, at glassy carbon (GC) electrodes, the same reaction is controlled by the desorption of the reaction products. These results account for the poor response for CySH determination at GC compared to BDD. It was found that BDD exhibits excellent behavior for CySH determination, clearly outperforming GC. The results demonstrate that measurement of the peak current for CySH oxidation can be used as a basis for simple method for determining CySH in the micromolar concentration range by the use of BDD electrodes.
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Affiliation(s)
- N Spãtaru
- Department of Applied Chemistry, School of Engineering, The University of Tokyo
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Mirčeski V, Gulaboski R, Jordanoski B, Komorsky-Lovrić Š. Square-wave voltammetry of 5-fluorouracil. J Electroanal Chem (Lausanne) 2000. [DOI: 10.1016/s0022-0728(00)00203-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mirčeski V, Lovrić M. A Cathodic Stripping Square-Wave Voltammetry of a Second-Order Redox Reaction and Its Application to the Mercury-Cysteine System. ELECTROANAL 1998. [DOI: 10.1002/(sici)1521-4109(199810)10:14<976::aid-elan976>3.0.co;2-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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B??nic?? FG, Sp??taru N, Sp??taru T. Catalytic hydrogen evolution in the presence of sulfide and cobalt ions. A study by cathodic stripping voltammetry on the hanging mercury drop electrode. ELECTROANAL 1997. [DOI: 10.1002/elan.1140091708] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Ion A, B??nic?? FG, Luca C. Catalytic cathodic stripping voltammetry of 6-mercaptopurine-9-D-riboside in the presence of nickel ion. ELECTROANAL 1997. [DOI: 10.1002/elan.1140091216] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Hidayat A, Hibbert DB, Alexander PW. Amperometric flow injection analysis of organic thiols and proteins. ELECTROANAL 1996. [DOI: 10.1002/elan.1140080513] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Lovrić M, Komorsky-Lovrić Š, Bond A. Theory of square-wave stripping voltammetry and chronoamperometry of immobilized reactants. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0022-0728(91)87064-b] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Woggon H, Macholz R, Jehle D. Folgeprodukte der Glucosinolat-Spaltung: Untersuchungen zur Identifizierung von Aminosäure-Senföl-Reaktionsprodukten unter besonderer Berücksichtigung polarographischer Arbeitstechniken. ACTA ACUST UNITED AC 1990. [DOI: 10.1002/food.19900340607] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Gruebele M, Polak M, Saykally RJ. Velocity modulation laser spectroscopy of negative ions: The infrared spectrum of hydrosulfide (SH−). J Chem Phys 1987. [DOI: 10.1063/1.452168] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hepel M, Osteryoung RA. Cathodic stripping analysis complicated by adsorption processes: Determination of 2-thiouracil at a rotating silver disk electrode. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/s0022-0728(83)80569-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bond A, Heritage I, Briggs M. A new polarographic response for ethynyloestradiol and its application to electrochemical detection associated with reverse-phase liquid chromatography. Anal Chim Acta 1982. [DOI: 10.1016/s0003-2670(01)85284-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Forsman U. Cathodic stripping voltammetric behaviour of cysteine and cystine in the presence of cupric ions. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/s0022-0728(81)80152-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Senda M, Ikeda T, Kakutani T, Kano K, Kinoshita H. 403 - Polarographic studies on proteins. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/0302-4598(81)80037-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Senda M, Ikeda T, Kakutani T, Kano K, Kinoshita H. Polarographic studies on proteins. J Electroanal Chem (Lausanne) 1981. [DOI: 10.1016/s0022-0728(81)80201-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Cathodic stripping voltammetry of penicillamine in the absence and presence of curpic ions. J Electroanal Chem (Lausanne) 1980. [DOI: 10.1016/s0022-0728(80)80053-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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