1
|
Mechanisms of novel method for removing cristobalite from montmorillonite through exfoliation of 2D montmorillonite. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
2
|
Tiwari S, Adupa V, Das DS, Anki Reddy K, Bharat TV. Structural and Dynamic Insights into SARS-CoV-2 Spike-Protein-Montmorillonite Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:9186-9194. [PMID: 35855632 PMCID: PMC9344787 DOI: 10.1021/acs.langmuir.2c00837] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 06/21/2022] [Indexed: 06/01/2023]
Abstract
The spike (S) protein of SARS-CoV-2 has been found to play a decisive role in the cell entry mechanism of the virus and has been the prime target of most vaccine development efforts. Although numerous vaccines are already in use and more than half of the world population has been fully vaccinated, the emergence of new variants of the virus poses a challenge to the existing vaccines. Hence, developing an effective drug therapy is a crucial step in ending the pandemic. Nanoparticles can play a crucial role as a drug or a drug carrier and help tackle the pandemic effectively. Here, we performed explicit all-atom molecular dynamics simulations to probe interactions between S protein and Montmorillonite (MMT) nano clay surface. We built two systems with different counterions (Na+ and Ca2+), namely Na-MMT and Ca-MMT, to investigate the effect of different ions on S protein-MMT interaction. Structural modification of S protein was observed in the presence of MMT surface, particularly the loss of helical content of S protein. We revealed that electrostatic and hydrophobic interactions synergistically govern the S protein-MMT interactions. However, hydrophobic interactions were more pronounced in the Na-MMT system than in Ca-MMT. We also revealed residues and glycans of S protein closely interacting with the MMT surface. Interestingly, N165 and N343, which we found to be closely interacting with MMT in our simulations, also have a critical role in cell entry and in thwarting the cell's immune response in recent studies. Overall, our work provides atomistic insights into S protein-MMT interaction and enriches our understanding of the nanoparticle-S protein interaction mechanism, which will help develop advanced therapeutic techniques in the future.
Collapse
Affiliation(s)
- Shivam Tiwari
- Department
of Chemical Engineering, Indian Institute
of Technology, Guwahati, Assam 781039, India
| | - Vasista Adupa
- Department
of Chemical Engineering, Indian Institute
of Technology, Guwahati, Assam 781039, India
| | - Dhanesh Sing Das
- Department
of Civil Engineering, Indian Institute of
Technology, Guwahati, Assam 781039, India
| | - K. Anki Reddy
- Department
of Chemical Engineering, Indian Institute
of Technology, Tirupati, Andhra Pradesh 517506, India
| | | |
Collapse
|
3
|
Dhasmana S, Das S, Shrivastava S. Potential nutraceuticals from the casein fraction of goat's milk. J Food Biochem 2021; 46:e13982. [PMID: 34716606 DOI: 10.1111/jfbc.13982] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 10/03/2021] [Accepted: 10/07/2021] [Indexed: 11/30/2022]
Abstract
Goat is one of the major dairy and meat providers. In terms of structure, nutrient content, and medicinal properties, goat milk is somewhat different from other milk. The differences in composition are important in determining the technical suitability of goat milk and its products for health benefits. In recent years, there has been increasing attention to the identification and molecular composition of milk proteins and the interest in caprine milk. Casein, which accounts for almost 80% of all the proteins, is the most significant protein found in goat milk. It is a pioneer in the field of nutraceutical formulation and drug production by using the goat mammary gland as a bioreactor. In goat milk, the most prevalent proteins are αS-casein, β-casein, and κ-casein. The aim of this review is to highlight the importance of goat milk casein and also focus on recent findings on their medicinal importance that may be helpful for further research on dairy products with health beneficial properties for humans as a remarkable nutraceutical. PRACTICAL APPLICATIONS: Goat milk casein is considered as a healthy nutrient as well as a therapeutic agent to control abnormal or disease conditions through some of its biologically active peptide residues. Casein fractions of goat milk have been shown to exhibit different biologic activities. Therefore, this study aims to observe the use of goat milk in various disorders and to know about the different products made from goat milk. It will be helpful in the field of medicine to be a new active constituent for the management of various disease conditions.
Collapse
Affiliation(s)
- Shruti Dhasmana
- Noida Institute of Engineering and Technology (Pharmacy Institute), Greater Noida, India
| | - Sanjita Das
- Noida Institute of Engineering and Technology (Pharmacy Institute), Greater Noida, India
| | - Shivani Shrivastava
- Noida Institute of Engineering and Technology (Pharmacy Institute), Greater Noida, India
| |
Collapse
|
4
|
Mineralogical and Physico-Chemical Characterization of the Oraşu-Nou (Romania) Bentonite Resources. MINERALS 2021. [DOI: 10.3390/min11090938] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The objective of this study is to describe the mineralogical composition and chemical properties of the Oraşu Nou bentonite, from northwestern Romania. For mineralogical determinations, the following were used: X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FR-IR), thermogravimetric analysis, scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX). The chemical compositions and physical properties of the bentonites and bentonitized rocks were also determined. Calcium type montmorillonite is the predominant mineral in this deposit. Its average mass fraction is between 35% and 75%, reaching up to 95%. A small amount of halloysite and very fine cristobalite were also identified in the fine fraction. Quartz, feldspar, and kaolinite were identified as impurities. The average pH of natural bentonite is 6.2. Its cation exchange capacity (CEC) is in the lower-middle range for smectites at 45.89 cmol/kg, absorption capacity 43.58 mL/g, swelling degree 9.41%. Because of the high amounts and purity of montmorillonite, the valuable component mineral, the way is open to an easy refinement of this important resource. This way very high-quality colloidal suspensions can be obtained which can be used in the most modern applications of micro- and nanostructured materials.
Collapse
|
5
|
Vian R, Salehi H, Lapierre M, Cuisinier F, Cavaillès V, Balme S. Adsorption of proteins on TiO 2 particles influences their aggregation and cell penetration. Food Chem 2021; 360:130003. [PMID: 33993073 DOI: 10.1016/j.foodchem.2021.130003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 04/09/2021] [Accepted: 05/01/2021] [Indexed: 12/21/2022]
Abstract
TiO2 nanoparticles known as E171 are one controversial food additive due to its potential toxicity. In this work, the main hypothesis is that the proteins adsorbed on the TiO2 nanoparticles prevent their aggregation and favor the cell penetration. To do so, the TiO2 nanoparticles were coated with gelatin and β-lactoglobulin to reach interfacial concentrations about 0.25 mg/mg and 0.32 mg/mg, respectively. The measurement of NP size showed that the protein coating improve the colloidal stability of TiO2 nanoparticles. The FTIR analysis suggests that the β-lactoglobulin structure is modified after adsorption. The penetration of TiO2 penetration inside human intestinal epithelial cells was shown and quantify by using confocal Raman microscopy. The promoting role of the protein coating on the cell penetration was demonstrated for both the gelatin and β-lactoglobulin. Finally, the results allow establishing a correlation between the ability of proteins to prevent NP aggregation and the cell penetration.
Collapse
Affiliation(s)
- Romain Vian
- IRCM, Institut de Recherche en Cancérologie de Montpellier, INSERM U1194, Université Montpellier, Montpellier F-34298, France
| | | | - Marion Lapierre
- IRCM, Institut de Recherche en Cancérologie de Montpellier, INSERM U1194, Université Montpellier, Montpellier F-34298, France
| | | | - Vincent Cavaillès
- IRCM, Institut de Recherche en Cancérologie de Montpellier, INSERM U1194, Université Montpellier, Montpellier F-34298, France
| | - Sébastien Balme
- IEM, Institut Européen des Membranes, UMR 5635 Université Montpellier, CNRS, ENSCM, Place Eugene Bataillon, F-34095 Montpellier cedex 5, France.
| |
Collapse
|
6
|
A novel paper-based and pH-sensitive intelligent detector in meat and seafood packaging. Talanta 2021; 224:121913. [DOI: 10.1016/j.talanta.2020.121913] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 11/15/2020] [Accepted: 11/16/2020] [Indexed: 12/15/2022]
|
7
|
Dong J, Cheng Z, Tan S, Zhu Q. Clay nanoparticles as pharmaceutical carriers in drug delivery systems. Expert Opin Drug Deliv 2020; 18:695-714. [PMID: 33301349 DOI: 10.1080/17425247.2021.1862792] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
INTRODUCTION Clay minerals are a class of silicates with chemical inertness, colloid, and thixotropy, which have excellent physicochemical properties, good biocompatibility, low toxicity, and have high application potential in biomedical fields. These inorganic materials have been widely used in pharmaceutical excipients and active substances. In recent years, nanoclay mineral materials have been used as drug vehicles for the delivery of a variety of drugs based on their broad specific surface area, rich porosity, diverse morphology, good adsorption performance, and high ion exchange capacity. AREAS COVERED This review introduces the structures, properties, and applications of various common natural and synthetic nanoclay materials as drug carriers. Natural nanoclays have different morphologies including nanoplates, nanotubes, and nanofibers. Synthetic materials have controllable sizes and flexible structures, where mesoporous silica nanoparticles, laponite, and imogolite are typical ones. These inorganic nanoparticles are often linked to polymers to form multifunctional drug delivery systems for better pharmaceutical performance. EXPERT OPINION The clay nanomaterials have typical properties, including enhanced solubility of insoluble drugs, targeting therapeutic sites, controlled release, and stimulation of responsive drug delivery systems.
Collapse
Affiliation(s)
- Jiani Dong
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences in Central South University, Changsha, Hunan, China
| | - Zeneng Cheng
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences in Central South University, Changsha, Hunan, China
| | - Songwen Tan
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences in Central South University, Changsha, Hunan, China
| | - Qubo Zhu
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences in Central South University, Changsha, Hunan, China
| |
Collapse
|
8
|
Vernhet A, Meistermann E, Cottereau P, Charrier F, Chemardin P, Poncet-Legrand C. Wine Thermosensitive Proteins Adsorb First and Better on Bentonite during Fining: Practical Implications and Proposition of Alternative Heat Tests. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:13450-13458. [PMID: 32142274 DOI: 10.1021/acs.jafc.0c00094] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Bentonite fining is the most popular treatment used to remove proteins in white and rosé wines. The usual heat test used to adjust the bentonite dose consists of heating the wine during 30 min at 80 °C. At this temperature, all of the proteins are unfolded, and this can lead to an overestimation of the dose. We have shown that proteins adsorb on bentonite in a specific order and, more importantly, that the proteins responsible for haze formation adsorb first. Fluorescence spectroscopy showed that this is due to the structural properties of proteins, which can be classified as hard and soft proteins. Alternative heat tests were performed at a lower temperature (40 °C) and showed a better correlation with accelerated aging. These tests were also less dependent upon the wine pH.
Collapse
Affiliation(s)
- Aude Vernhet
- Sciences pour l'Œnologie (SPO), Institut National de Recherche en Agriculture, Alimentation et Environnement (INRAE), Université de Montpellier, Montpellier SupAgro, 34060 Montpellier, France
| | - Eric Meistermann
- Institut Français de la Vigne et du Vin, 30240 Le Grau-du-Roi, France
| | | | - Frederic Charrier
- Institut Français de la Vigne et du Vin, 30240 Le Grau-du-Roi, France
| | - Patrick Chemardin
- Sciences pour l'Œnologie (SPO), Institut National de Recherche en Agriculture, Alimentation et Environnement (INRAE), Université de Montpellier, Montpellier SupAgro, 34060 Montpellier, France
| | - Céline Poncet-Legrand
- Sciences pour l'Œnologie (SPO), Institut National de Recherche en Agriculture, Alimentation et Environnement (INRAE), Université de Montpellier, Montpellier SupAgro, 34060 Montpellier, France
| |
Collapse
|
9
|
Alcântara ACS, Darder M, Aranda P, Ruiz-Hitzky E. Zein-layered hydroxide biohybrids: strategies of synthesis and characterization. MATERIALS 2020; 13:ma13040825. [PMID: 32054135 PMCID: PMC7079599 DOI: 10.3390/ma13040825] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 01/27/2020] [Accepted: 01/31/2020] [Indexed: 12/30/2022]
Abstract
This work constitutes a basic study about the first exploration on the preparation of biohybrids based on the corn protein zein and layered metal hydroxides, such as layered double hydroxides (LDH) and layered single hydroxides (LSHs). For this purpose, MgAl layered double hydroxide and the Co2(OH)3 layered single hydroxide were selected as hosts, and various synthetic approaches were explored to achieve the formation of the zein-layered hydroxide biohybrids, profiting from the presence of negatively charged groups in zein in basic medium. Zein-based layered hydroxide biohybrids were characterized by diverse physicochemical techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis/differential thermal analysis (TG/DTA), solid state 13C cross-polarization magical angle spinning nuclear magnetic resonance (CP-MAS NMR), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), etc., which suggest that the different synthesis procedures employed and the anion located in the interlayer region of the inorganic host material seem to have a strong influence on the final features of the biohybrids, resulting in mixed, single intercalated, or highly exfoliated intercalated phases. Thus, the resulting biohybrids based on zein and layered hydroxides could have interest in applications in biomedicine, biosensing, materials for electronic devices, catalysis, and photocatalysis.
Collapse
|
10
|
Coglitore D, Janot JM, Balme S. Protein at liquid solid interfaces: Toward a new paradigm to change the approach to design hybrid protein/solid-state materials. Adv Colloid Interface Sci 2019; 270:278-292. [PMID: 31306853 DOI: 10.1016/j.cis.2019.07.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 07/04/2019] [Accepted: 07/05/2019] [Indexed: 10/26/2022]
Abstract
This review gives an overview of protein adsorption at solid/liquid interface. Compared to the other ones, we have focus on three main questions with the point of view of the protein. The first question is related to the kinetic and especially the using of Langmuir model to describe the protein adsorption. The second question is about the concept of hard and soft protein. In this part, we report the protein structural modification induced by adsorption regarding their intrinsic structure. This allows formulating of a new concept to classify the protein to predict their behavior at solid/liquid interface. The last question is related to the protein corona. We give an overview about the soft/hard corona and attempt to make correlation with the concept of hard/soft protein.
Collapse
|
11
|
Akbari Alavijeh M, Sarvi MN, Ramazani Afarani Z. Modified montmorillonite nanolayers for nano-encapsulation of biomolecules. Heliyon 2019; 5:e01379. [PMID: 30963121 PMCID: PMC6434184 DOI: 10.1016/j.heliyon.2019.e01379] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 12/31/2018] [Accepted: 03/14/2019] [Indexed: 11/07/2022] Open
Abstract
Vitamin B6 was nano-encapsulated in between modified montmorillonite nanolayers. Results indicated that electrostatic interaction forces dominate the adsorption onto different sites of the nanolayers. The successful nano-encapsulation was achieved when the interlayers spaces of the nanolayer were saturated with cations of Na+ or Ca2+ resulted in adsorption of vitamin B6 in between nanosheets. At these conditions, controlled pH-responsive desorption properties were detected and vitamin B6 was released mostly from the interlayer spaces. The presented modified montmorillonite could be used for nanoencapsulation of drugs and biomolecules with high protection of carrying materials during storage and even through the digestion process.
Collapse
Affiliation(s)
| | - Mehdi Nasiri Sarvi
- Department of Mining Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | | |
Collapse
|
12
|
Caro-León FJ, Argüelles-Monal W, Carvajal-Millán E, López-Franco YL, Goycoolea-Valencia FM, San Román del Barrio J, Lizardi-Mendoza J. Production and characterization of supercritical CO2 dried chitosan nanoparticles as novel carrier device. Carbohydr Polym 2018; 198:556-562. [DOI: 10.1016/j.carbpol.2018.06.102] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 05/10/2018] [Accepted: 06/22/2018] [Indexed: 02/07/2023]
|
13
|
Trigueiro P, Pedetti S, Rigaud B, Balme S, Janot JM, dos Santos IM, Gougeon R, Fonseca MG, Georgelin T, Jaber M. Going through the wine fining: Intimate dialogue between organics and clays. Colloids Surf B Biointerfaces 2018; 166:79-88. [DOI: 10.1016/j.colsurfb.2018.02.060] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 02/01/2018] [Accepted: 02/27/2018] [Indexed: 10/17/2022]
|
14
|
|
15
|
Mesoporous calcium phosphate using casein as a template: Application to bovine serum albumin sorption. Colloids Surf B Biointerfaces 2017; 158:480-487. [PMID: 28735220 DOI: 10.1016/j.colsurfb.2017.07.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 05/31/2017] [Accepted: 07/05/2017] [Indexed: 12/28/2022]
Abstract
Mesoporous hydroxyapatites were synthesized at room temperature using casein as a template, and key experimental factors, such as casein concentration, pH and extraction of casein in the final solids by washing and thermal treatment, were systematically investigated. The X-Ray Diffraction (XRD) patterns confirmed the synthesis of well-crystallized hydroxyapatite. The N2 adsorption/desorption isotherms were in agreement with the formation of mesoporous hydroxyapatite with a maximum surface area of 106m2g-1. Infrared spectroscopy and thermogravimetry analysis were performed to investigate the extraction of casein in water in the post-synthesis stage. Pure mesoporous hydroxyapatite exhibited good BSA adsorption capacity higher than the one obtained for conventional hydroxyapatite.
Collapse
|
16
|
Felbeck T, Moss S, Botas AMP, Lezhnina MM, Ferreira RAS, Carlos LD, Kynast UH. Monitoring of nanoclay-protein adsorption isotherms via fluorescence techniques. Colloids Surf B Biointerfaces 2017. [PMID: 28623694 DOI: 10.1016/j.colsurfb.2017.06.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The investigation of nanoparticles and their interaction with bio-macromolecules have become an important issue; the widely discussed protein corona around nanoparticles and their biological fate in general have drawn particular attention. Here, we focus on nanoclay dispersions and the use of solvatochromic fluorescent dyes (Dansyl and Coumarin 153) for monitoring the interaction with two model proteins, bovine serum albumin and β-lactoglobulin. On one hand, these dyes are poorly emissive in water, but experience a boost in their fluorescence when adsorbed into the hydrophobic domains of proteins. On the other hand, (nano)clays and clay minerals have previously been investigated in terms of their individual protein adsorption isotherms and their usefulness for the solubilization of water-insoluble dyes into an aqueous environment. In the following, we have combined all three individual parts (nanoclay, fluorophore and protein) in dispersions in a wide range of concentration ratios to systematically study the various adsorption processes via fluorescence techniques. In order to clarify the extent of dye diffusion and adsorption-desorption equilibria in the investigations, nanoclay hybrids with an adsorbed dye (Coumarin 153) and a covalently conjugated dye (Dansyl) were compared. The results suggest that the fluorescence progression of protein titration curves correlate with the amount of protein adsorbed, matching their reported adsorption isotherms on hectorite clays. Furthermore, experimental data on the protein monolayer formation around the nanoclays could be extracted due to only minor alterations of the dispersions' optical quality and transparency. In this manner, a fluorescence-based monitor for the formation of the globular protein layer around the nanoclay was realized.
Collapse
Affiliation(s)
- Tom Felbeck
- Münster University of Applied Sciences, Institute for Optical Technologies, Stegerwaldstr. 39, 48565 Steinfurt, Germany; Department of Physics and CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Sebastian Moss
- Münster University of Applied Sciences, Institute for Optical Technologies, Stegerwaldstr. 39, 48565 Steinfurt, Germany
| | - Alexandre M P Botas
- Department of Physics and CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Marina M Lezhnina
- Münster University of Applied Sciences, Institute for Optical Technologies, Stegerwaldstr. 39, 48565 Steinfurt, Germany
| | - Rute A S Ferreira
- Department of Physics and CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Luís D Carlos
- Department of Physics and CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Ulrich H Kynast
- Münster University of Applied Sciences, Institute for Optical Technologies, Stegerwaldstr. 39, 48565 Steinfurt, Germany.
| |
Collapse
|
17
|
|
18
|
Schmidt MP, Martínez CE. Kinetic and Conformational Insights of Protein Adsorption onto Montmorillonite Revealed Using in Situ ATR-FTIR/2D-COS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7719-7729. [PMID: 27406925 DOI: 10.1021/acs.langmuir.6b00786] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Protein adsorption onto clay minerals is a process with wide-ranging impacts on the environmental cycling of nutrients and contaminants. This process is influenced by kinetic and conformational factors that are often challenging to probe in situ. This study represents an in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopic investigation of the adsorption of a model protein (bovine serum albumin (BSA)) onto a clay mineral (montmorillonite) at four concentrations (1.50, 3.75, 7.50, and 15.0 μM) under environmentally relevant conditions. At all concentrations probed, FTIR spectra show that BSA readily adsorbs onto montmorillonite. Adsorption kinetics follow an Elovich model, suggesting that primary limitations on adsorption rates are surface-related heterogeneous energetic restrictions associated with protein rearrangement and lateral protein-protein interaction. BSA adsorption onto montmorillonite fits the Langmuir model, yielding K = 5.97 × 10(5) M(-1). Deconvolution and curve fitting of the amide I band at the end of the adsorption process (∼120 min) shows a large extent of BSA unfolding upon adsorption at 1.50 μM, with extended chains and turns increasing at the expense of α-helices. At higher concentrations/surface coverages, BSA unfolding is less pronounced and a more compact structure is assumed. Two-dimensional correlation spectroscopic (2D-COS) analysis reveals three different pathways corresponding to adsorbed conformations. At 1.50 μM, adsorption increases extended chains, followed by a loss in α-helices and a subsequent increase in turns. At 3.75 μM, extended chains decrease and then aggregated strands increase and side chains decrease, followed by a decrease in turns. With 7.50 and 15.0 μM BSA, the loss of side-chain vibrations is followed by an increase in aggregated strands and a subsequent decrease in turns and extended chains. Overall, the BSA concentration and resultant surface coverage have a profound impact on the dynamics of BSA adsorption onto montmorillonite. These results enhance our understanding of the molecular-level protein dynamics and stabilization of organic matter at mineral surfaces.
Collapse
Affiliation(s)
- Michael P Schmidt
- Soil and Crop Sciences Section, School of Integrative Plant Science, Cornell University , Ithaca, New York 14853, United States
| | - Carmen Enid Martínez
- Soil and Crop Sciences Section, School of Integrative Plant Science, Cornell University , Ithaca, New York 14853, United States
| |
Collapse
|
19
|
Andersen A, Reardon PN, Chacon SS, Qafoku NP, Washton NM, Kleber M. Protein-Mineral Interactions: Molecular Dynamics Simulations Capture Importance of Variations in Mineral Surface Composition and Structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6194-6209. [PMID: 27243116 DOI: 10.1021/acs.langmuir.6b01198] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Molecular dynamics simulations, conventional and metadynamics, were performed to determine the interaction of model protein Gb1 over kaolinite (001), Na(+)-montmorillonite (001), Ca(2+)-montmorillonite (001), goethite (100), and Na(+)-birnessite (001) mineral surfaces. Gb1, a small (56 residue) protein with a well-characterized solution-state nuclear magnetic resonance (NMR) structure and having α-helix, 4-fold β-sheet, and hydrophobic core features, is used as a model protein to study protein soil mineral interactions and gain insights on structural changes and potential degradation of protein. From our simulations, we observe little change to the hydrated Gb1 structure over the kaolinite, montmorillonite, and goethite surfaces relative to its solvated structure without these mineral surfaces present. Over the Na(+)-birnessite basal surface, however, the Gb1 structure is highly disturbed as a result of interaction with this birnessite surface. Unraveling of the Gb1 β-sheet at specific turns and a partial unraveling of the α-helix is observed over birnessite, which suggests specific vulnerable residue sites for oxidation or hydrolysis possibly leading to fragmentation.
Collapse
Affiliation(s)
| | | | - Stephany S Chacon
- Department of Crop and Soil Science, Oregon State University , Corvallis, Oregon 97331, United States
| | | | | | - Markus Kleber
- Department of Crop and Soil Science, Oregon State University , Corvallis, Oregon 97331, United States
- Institut für Bodenlandschaftsforschung, Leibniz Zentrum für Agrarlandschaftsforschung (ZALF) , Eberswalder Straβe 84, 15374 Müncheberg, Germany
| |
Collapse
|
20
|
Thangaraj V, Bussiere J, Janot JM, Bechelany M, Jaber M, Subramanian S, Miele P, Balme S. Fluorescence Quenching of Sulforhodamine Dye over Graphene Oxide and Boron Nitride Nanosheets. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501153] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|