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Hao G, Qi Z, Li L, Xu ZP. Investigation of the mucin-nanoparticle interactions via real-time monitoring by microbalance and kinetic model simulation. J Colloid Interface Sci 2024; 661:588-597. [PMID: 38308897 DOI: 10.1016/j.jcis.2024.01.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 12/15/2023] [Accepted: 01/11/2024] [Indexed: 02/05/2024]
Abstract
Interactions between nanoparticles and the mucus layer are crucial to understand the behaviours in biological environments and design drug delivery systems. In this study, we developed a kinetic deposition model for the dynamic mucin-nanoparticle interactions using quartz crystal microbalance with dissipation (QCM-D). We investigated the effects of the physiochemical properties of several nanoparticles (including size, charge, and shape) and the physiological conditions on the mucin-nanoparticle interaction. Interestingly, layered double hydroxide (LDH) nanoparticles showed stronger interactions with the mucus layer compared to other types of nanoparticles due to their unique plate-like morphology. In specific for sheet-like LDH nanoparticles, our model found that their equilibrium adsorption capacity (Qe) followed the Langmuir adsorption isotherm, and the adsorption rate (k1) increased proportionally with the nanoparticle concentration. In addition, the particle size and thickness affected Qe and the surface coverage. Furthermore, bovine serum albumin (BSA) coating dramatically increased k1 of LDH nanoparticles. We proposed a novel mechanism to elucidate mucin-nanoparticle interactions, shedding light on the synergistic roles of drag force (Fd), repulsive force (Fr), and adsorptive force (Fa). These findings offer valuable insights into the complex mucin-nanoparticle interactions and provide guidance for the design of drug delivery systems.
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Affiliation(s)
- Guanyu Hao
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Zhi Qi
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Li Li
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia.
| | - Zhi Ping Xu
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia.
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2
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Luo X, Chen B, Li J, Zhou C, Guo M, Peng K, Dai H, Lan B, Xiong W, Liu Y. Zwitterion modified chitosan as a high-performance corrosion inhibitor for mild steel in hydrochloric acid solution. Int J Biol Macromol 2024; 267:131429. [PMID: 38583828 DOI: 10.1016/j.ijbiomac.2024.131429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 03/14/2024] [Accepted: 04/04/2024] [Indexed: 04/09/2024]
Abstract
Herein, a novel chitosan Schiff base (CS-FGA) as a sustainable corrosion inhibitor has been successfully synthesized via a simple amidation reaction by using an imidazolium zwitterion and chitosan (CS). The corrosion inhibition property of CS-FGA for mild steel (MS) in a 1.0 M HCl solution was studied by various electrochemical tests and physical characterization methods. The findings indicate that the maximum inhibition efficiency of CS-FGA as a mixed-type inhibitor for MS in 1.0 M HCl solution with 400 mg L-1 reaches 97.6 %, much much higher than the CS and the recently reported chitosan-based inhibitors. Scanning electron microscopy (SEM), atomic force microscopy (AFM), and water contact angle (WCA) results reveal that the CS-FGA molecules firmly adsorb on the MS surface to form a protective layer. The adsorption of CS-FGA on the MS surface belongs to the Langmuir adsorption isotherm containing both the physisorption and chemisorption. According to the X-ray photoelectron spectroscopy (XPS) and UV-vis spectrum, FeN bonds presented on the MS surface further prove the chemisorption between CS-FGA and Fe to generate the stable protective layer. Additionally, theoretical calculations from quantum chemical calculation (DFT) and molecular simulations (MD) were performed to reveal the inhibition mechanism of CS-FGA.
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Affiliation(s)
- Xiaohu Luo
- School of Chemistry and Environment, Jiaying University, Meizhou 514015, PR China; Engineering Research Center of Loss Efficacy and Anticorrosion of Materials of Guizhou, School of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun 558000, PR China; State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China
| | - Bo Chen
- School of Chemistry and Environment, Jiaying University, Meizhou 514015, PR China; State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China
| | - Ji Li
- SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, PR China
| | - Chengliang Zhou
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China
| | - Meng Guo
- Engineering Research Center of Loss Efficacy and Anticorrosion of Materials of Guizhou, School of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun 558000, PR China
| | - Kaimei Peng
- Engineering Research Center of Loss Efficacy and Anticorrosion of Materials of Guizhou, School of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun 558000, PR China
| | - Hong Dai
- Engineering Research Center of Loss Efficacy and Anticorrosion of Materials of Guizhou, School of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun 558000, PR China.
| | - Bang Lan
- School of Chemistry and Environment, Jiaying University, Meizhou 514015, PR China
| | - Wentao Xiong
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China
| | - Yali Liu
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China.
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3
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Bayram A, Arkan E, Sutcu M. Toxic gas removal with kaolinite, metakaolinite, radiolarite, and diatomite. Chemosphere 2023; 314:137707. [PMID: 36592829 DOI: 10.1016/j.chemosphere.2022.137707] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/21/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
In this study, some clays and dead microorganisms were compared in terms of their adsorption ability against special toxic gases. To this end, an experimental investigation was conducted to explore the adsorption kinetics of kaolinite, metakaolinite, radiolarite, and diatomite to ammonia (NH3), ethylene (C2H4), and carbon dioxide (CO2). Numerous analyses, such as x-ray fluorescence (XRF), x-ray diffraction (XRD), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM), and particle size distribution, have been performed for mineralogical and structural characterization of studied materials. Also, adsorption characteristics were investigated with the help of an ultra-precision scale and computer-controlled multi-gas control system. Since ammonia has the highest dipole moment among all studied gases, its removal efficiency was found as the highest in all materials. Regarding clay substances, metakaolinite indicated a lower response than kaolinite due to phase transformation. But, considering the microorganisms, diatomite toxic gas uptake is at least five times better than examined clays while the gas uptake behavior of radiolarite is analog to metakaolinite. Moreover, the adsorption behaviors of proposed materials are clarified with Langmuir isotherms, The results could facilitate improvements in applying microorganisms to the toxic gas environment as a natural adsorbent material.
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Affiliation(s)
- Abdullah Bayram
- Agricultural and Biological Engineering, Purdue University, West Lafayette, 47907, Indiana, USA
| | - Emre Arkan
- Institute of Chemistry, University of Silesia in Katowice, Szkolna 9, Katowice 40-006, Poland
| | - Mucahit Sutcu
- Department of Metallurgical and Materials Engineering, Izmir Katip Celebi University, 35620 İzmir, Turkiye.
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4
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Bayram A, Farzaneh A, Esrafili MD, Okur S, Ozdemir E. Hollow nano-CaCO3's VOC sensing properties: A DFT calculation and experimental assessments. Chemosphere 2023; 313:137334. [PMID: 36427584 DOI: 10.1016/j.chemosphere.2022.137334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/08/2022] [Accepted: 11/17/2022] [Indexed: 06/16/2023]
Abstract
Air is the most critical and necessary for life, and air quality significantly impacts people's health. Both indoor and outdoor pollution frequently contain volatile organic compounds (VOCs). Such contaminants provide immediate or long-term health risks to the living system. The present study investigates sorption characteristics of VOCs on hollow nano calcite (CaCO3) particles with 250 nm and 40 nm pore sizes to remove from the air ambient using the quartz crystal microbalance (QCM) technique at room temperature both experimentally and theoretically. The results were supported by density functional theory (DFT), and adsorption-desorption characteristics were studied with Langmuir adsorption isotherms. The QCM measurements showed a stable signal without having hysteresis, and the response of polar VOCs on hollow nano-CaCO3 particles such as ethanol, propanol, and humidity with higher polarity was less compared to solvents such as chloroform and dichloromethane, which revealed that the surfaces of CaCO3 particles have mostly non-polar properties. CaCO3 surface and VOC molecule interactions overlap with the Langmuir model. With DFT calculations, VOC and water molecule adsorption changes the CaCO3 Egap. Our findings show that the ΔEgap values increase as chloroform > dichloromethane > propanol > ethanol > water. This order suggests that the sensing response of the hollow CaCO3 structure is linearly proportional to the adsorption energies of VOC and water. The linear adsorption characteristics, high sensing response, and short recovery time illustrated that the newly synthesized nano-CaCO3 could be implemented as a new VOC adsorbent material for health, environmental sustainability, and in vitro microbiome cultures.
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Affiliation(s)
- Abdullah Bayram
- Material Science and Engineering, Katip Celebi University, Izmir, Turkey
| | - Amir Farzaneh
- Laboratory of Theoretical Chemistry, Department of Chemistry, University of Maragheh, Maragheh, Iran
| | - Mehdi D Esrafili
- Laboratory of Theoretical Chemistry, Department of Chemistry, University of Maragheh, Maragheh, Iran
| | - Salih Okur
- Material Science and Engineering, Katip Celebi University, Izmir, Turkey.
| | - Ekrem Ozdemir
- Department of Chemical Engineering, Izmir Institute of Technology, Izmir, 35430, Turkey.
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5
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Li Y, Zhou Y, Wang R, Chen Z, Luo X, Wang L, Zhao X, Zhang C, Yu P. Removal of aflatoxin B 1 from aqueous solution using amino-grafted magnetic mesoporous silica prepared from rice husk. Food Chem 2022; 389:132987. [PMID: 35489257 DOI: 10.1016/j.foodchem.2022.132987] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 04/12/2022] [Accepted: 04/12/2022] [Indexed: 11/16/2022]
Abstract
It is urgent to solve the contamination of aflatoxin B1 (AFB1) in food and water. In this study, the mesoporous silica was prepared from rice husk, which was then magnetized using the precipitation technique, followed by amino-modification with 3-aminopropyltriethoxysilane, forming amino-grafted magnetic mesoporous silica (NMMS). X-ray diffraction, Fourier transformed infrared spectra, and thermogravimetric analysis showed the successful grafting of amino groups on NMMS with a percentage of grafting up to 13.33%. The NMMS had an adsorption capacity of 169.88 μg/g and a removal rate of 93.43% for AFB1 in aqueous solutions at 20 °C, pH 7.0 for 2.0 h. The adsorption of AFB1 by NMMS followed a quasi-second-order kinetics and fitted well with the Langmuir model. Furthermore, the removal rate of AFB1 by NMMS remained 72.43% after repeating the adsorption-desorption process for five times. This study provided a facile approach to prepare NMMS for effective removal of AFB1.
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Affiliation(s)
- Ya'nan Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Yunyu Zhou
- School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Wuxi Zodolabs Biotech Co., Ltd, Yanxin Road 311, Wuxi 214174, China
| | - Ren Wang
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China.
| | - Zhengxing Chen
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Xiaohu Luo
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Li Wang
- School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Xiuping Zhao
- School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Chen Zhang
- Wuxi Xinwu Environmental Protection Technology Co., Ltd, Tianshan Road 8-2116, Wuxi 214028, China
| | - Peibin Yu
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
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Verma C, Quraishi MA. Gum Arabic as an environmentally sustainable polymeric anticorrosive material: Recent progresses and future opportunities. Int J Biol Macromol 2021; 184:118-134. [PMID: 34119540 DOI: 10.1016/j.ijbiomac.2021.06.050] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 06/06/2021] [Accepted: 06/07/2021] [Indexed: 11/18/2022]
Abstract
Gum Arabic (GA) is a plant exudate, consisting of glycoproteins (proteins with carbohydrate co-factor or prosthetic group) and polysaccharides mainly consisting of galactose and arabinose. Because of its polymeric nature and tendency to dissolve in water, GA is widely used as anticorrosive materials, especially in the aqueous electrolytes. GA contains various electron rich polar sites through which they easily get adsorbed on metallic surface and behaves as effective anticorrosive materials. Because of its natural and biological origin, GA is regarded as one of the environmental sustainable and edible alternatives to traditional toxic corrosion inhibitors. Present review piece of writing aims to illustrate the assortment of literatures on gum Arabic as a corrosion inhibitor. Limitation of traditional organic corrosion inhibitors and advantages of using GA as an environmental sustainable alternative have also been described along with the mechanism of corrosion inhibition.
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Affiliation(s)
- Chandrabhan Verma
- Interdisciplinary Research Center for Advanced Materials, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - M A Quraishi
- Interdisciplinary Research Center for Advanced Materials, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
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7
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Deng S, Li D, Yang X, Xing W, Li J, Zhang Q. Iron [Fe(0)]-rich substrate based on iron-carbon micro-electrolysis for phosphorus adsorption in aqueous solutions. Chemosphere 2017; 168:1486-1493. [PMID: 27927281 DOI: 10.1016/j.chemosphere.2016.11.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 11/02/2016] [Accepted: 11/09/2016] [Indexed: 06/06/2023]
Abstract
The phosphorus (P) adsorption properties of an iron [Fe(0)]-rich substrate (IRS) composed of iron scraps and activated carbon were investigated based on iron-carbon micro-electrolysis (IC-ME) and compared to the substrates commonly used in constructed wetlands (CWs) to provide an initial characterization of the [Fe(0)]-rich substrate. The results showed that P was precipitated by Fe(III) dissolved from the galvanic cell reactions in the IRS and the reaction was suppressed by the pH and stopped when the pH exceeded 8.90 ± 0.09. The adsorption capacity of the IRS decreased by only 4.6% in the second round of adsorption due to Fe(0) consumption in the first round. Substrates with high Ca- and Mg-oxide contents and high Fe- and Al-oxide contents had higher P adsorption capacities at high and low pH values, respectively. Substrates containing high Fe and Al concentrations and low Ca concentrations were more resistant to decreases in the P adsorption capacity resulting from organic matter (OM) accumulation. The IRS with an iron scrap to activated carbon volume ratio of 3:2 resulted in the highest P adsorption capacity (9.34 ± 0.14 g P kg-1), with minimal pH change and strong adaptability to OM accumulation. The Fe(0)-rich substrate has the considerable potential for being used as a CW substrate.
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Affiliation(s)
- Shihai Deng
- School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China.
| | - Desheng Li
- School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China.
| | - Xue Yang
- School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China
| | - Wei Xing
- School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China
| | - Jinlong Li
- School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China
| | - Qi Zhang
- School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China
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8
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Bénarouche A, Sams L, Bourlieu C, Vié V, Point V, Cavalier JF, Carrière F. Studying Gastric Lipase Adsorption Onto Phospholipid Monolayers by Surface Tensiometry, Ellipsometry, and Atomic Force Microscopy. Methods Enzymol 2016; 583:255-278. [PMID: 28063494 DOI: 10.1016/bs.mie.2016.09.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The access to kinetic parameters of lipolytic enzyme adsorption onto lipids is essential for a better understanding of the overall catalytic process carried out by these interfacial enzymes. Gastric lipase, for instance, shows an apparent optimum activity on triglycerides (TAG) at acidic pH, which is controlled by its pH-dependent adsorption at lipid-water interfaces. Since gastric lipase acts on TAG droplets covered by phospholipids, but does not hydrolyze these lipids, phospholipid monolayers spread at the air-water interfaces can be used as biomimetic interfaces to study lipase adsorption and penetration through the phospholipid layer, independently from the catalytic activity. The adsorption of recombinant dog gastric lipase (rDGL) onto 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC) monolayers can be monitored by surface tensiometry at various enzyme concentrations, pHs, and surface pressures (Π). These experimental data and the use of Langmuir adsorption isotherm and Verger-de Haas' lipase kinetics models further allow estimating various parameters including the adsorption equilibrium constant (KAds), the interfacial concentration [Formula: see text] , the molar fraction [Formula: see text] (ΦE*(%), mol%), and the molecular area [Formula: see text] of rDGL adsorbed onto the DLPC monolayer under various conditions. Additional insight into rDGL adsorption/insertion on phospholipid monolayers can be obtained by combining ellipsometry, Langmuir-Blodgett film transfer, and atomic force microscopy. When using multicomponent phospholipid monolayers with phase separation, these techniques allow to visualizing how rDGL preferentially partitions toward liquid expanded phase and at phase boundaries, gets adsorbed at various levels of insertion and impacts on the lateral organization of lipids.
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Affiliation(s)
- A Bénarouche
- CNRS, Aix Marseille Université, Enzymologie Interfaciale et de Physiologie de la Lipolyse, Marseille, France
| | - L Sams
- CNRS, Aix Marseille Université, Enzymologie Interfaciale et de Physiologie de la Lipolyse, Marseille, France
| | - C Bourlieu
- INRA CIRAD, UMR1208 IATE, Montpellier, France
| | - V Vié
- Université Rennes 1, Institut de Physique de Rennes, UMR CNRS 6251, Rennes cedex, France
| | - V Point
- CNRS, Aix Marseille Université, Enzymologie Interfaciale et de Physiologie de la Lipolyse, Marseille, France
| | - J F Cavalier
- CNRS, Aix Marseille Université, Enzymologie Interfaciale et de Physiologie de la Lipolyse, Marseille, France
| | - F Carrière
- CNRS, Aix Marseille Université, Enzymologie Interfaciale et de Physiologie de la Lipolyse, Marseille, France.
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Zhang N, Zang GL, Shi C, Yu HQ, Sheng GP. A novel adsorbent TEMPO-mediated oxidized cellulose nanofibrils modified with PEI: Preparation, characterization, and application for Cu(II) removal. J Hazard Mater 2016; 316:11-18. [PMID: 27208612 DOI: 10.1016/j.jhazmat.2016.05.018] [Citation(s) in RCA: 137] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 04/19/2016] [Accepted: 05/05/2016] [Indexed: 06/05/2023]
Abstract
This study describes the preparation of a novel adsorbent based on cellulose nanofibrils by first TEMPO mediated oxidation and then PEI grafting (TOCN-PEI) for heavy metal removal. FTIR results demonstrated the successful introduction of the adsorption functional groups (carboxyl and amino groups), and the elemental analysis and acid base titration were used to quantify the contents of these introduced groups. The kinetics curve suited the pseudo-second-order model better and the equilibrium data well fitted the Langmuir model, with the maximum Cu(II) uptake of 52.32mgg(-1). Kinetic study showed that the PEI grafting increased the initial adsorption rate of the TOCN-PEI compared with the adsorbents without PEI. Thermodynamic study was carried out through isothermal titration calorimetry (ITC) measurement and the binding reaction was found to be exothermic and driven by enthalpy change. The adsorption process by TOCN-PEI was pH dependent, and decreasing pH would lead to desorption of Cu(II) ions, thus make the reuse of the absorbent more convenient through adsorption-desorption cycles.
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Affiliation(s)
- Nan Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Guo-Long Zang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Chen Shi
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Guo-Ping Sheng
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
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10
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Savoy JD, Baird JK, Lang JR. Ion exchange at the critical point of solution. J Chromatogr A 2016; 1437:58-66. [PMID: 26884137 DOI: 10.1016/j.chroma.2016.01.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Revised: 01/07/2016] [Accepted: 01/10/2016] [Indexed: 11/23/2022]
Abstract
A mixture of isobutyric acid (IBA)+water has an upper critical point of solution at 26.7°C and an IBA concentration of 4.40M. We have determined the Langmuir isotherms for the hydroxide form of Amberlite IRN-78 resin in contact with mixtures of IBA+water at temperatures, 27.0, 29.0, 31.0 and 38.0°C, respectively. The Langmuir plot at 38.0°C forms a straight line. At the three lower temperatures, however, a peak in the Langmuir plot is observed for IBA concentrations in the vicinity of 4.40M. We regard this peak to be a critical effect not only because it is located close to 4.40M, but also because its height becomes more pronounced as the temperature of the isotherm approaches the critical temperature. For concentrations in the vicinity of the peak, the data indicate that the larger isobutyrate ion is rejected by the resin in favor of the smaller hydroxide ion. This reversal of the expected ion exchange reaction might be used to separate ions according to size. Using the Donnan theory of ion exchange equilibrium, we link the swelling pressure to the osmotic pressure. We show that the peak in the Langmuir plot is associated with a maximum in the "osmotic" energy. This maximum has its origin in the concentration derivative of the osmotic pressure, which goes to zero as the critical point is approached.
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11
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Patel DD, Anderson BD. Adsorption of Polyvinylpyrrolidone and its Impact on Maintenance of Aqueous Supersaturation of Indomethacin via Crystal Growth Inhibition. J Pharm Sci 2015. [PMID: 26037309 DOI: 10.1002/jps.24493.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This study explored the adsorption and crystal growth inhibitory effects of polyvinylpyrrolidone (PVP) on indomethacin crystals in an aqueous medium. A solution depletion method was used to construct adsorption isotherms of PVPs with different molecular weights and N-vinylpyrrolidone onto indomethacin crystals. The affinity for and extent of maximum adsorption of PVP on indomethacin crystals were significantly higher than that of N-vinylpyrrolidone, which was attributed to cooperative interactions between PVP and the surface of indomethacin. The extent of PVP adsorption onto indomethacin crystals in terms of mg/m(2) was greater for higher molecular weight PVP but less on a molar basis indicating an increased percentage of loops and tails for the higher molecular weight PVP. PVP significantly inhibited the crystal growth of indomethacin at a high degree of supersaturation as compared with N-vinylpyrrolidone, which was attributed to a change in indomethacin crystal growth mechanism leading to a change in the rate limiting step from bulk diffusion to surface integration. Higher molecular weight PVPs are better inhibitors of the crystal growth of indomethacin than lower molecular weight PVPs, which was attributed in part to a greater barrier for surface diffusion of indomethacin provided by a thicker adsorption layer of PVP.
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Affiliation(s)
- Dhaval D Patel
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky, 40506
| | - Bradley D Anderson
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky, 40506
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Lai C, Tu M, Shi Z, Zheng K, Olmos LG, Yu S. Contrasting effects of hardwood and softwood organosolv lignins on enzymatic hydrolysis of lignocellulose. Bioresour Technol 2014; 163:320-7. [PMID: 24835744 DOI: 10.1016/j.biortech.2014.04.065] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2014] [Revised: 04/17/2014] [Accepted: 04/19/2014] [Indexed: 05/02/2023]
Abstract
Identifying an appropriate parameter to elucidate effects of lignin on enzymatic hydrolysis is essential to understand the interactions between enzymes and lignin. Contrasting effects of hardwood organosolv lignin (EOL-SG) and softwood organosolv lignin (EOL-LP) on enzymatic hydrolysis were observed. The addition of EOL-SG (8 g/L) significantly improved the 72 h hydrolysis yields of organosolv pretreated sweetgum (OPSG) and loblolly pine (OPLP) from 49.3% to 68.6% and from 41.2% to 60.8%, respectively. In contrast, the addition of EOL-LP decreased the 72 h hydrolysis yields of OPSG and OPLP to 42.0% and 38.1%, respectively. A strong correlation between the distribution coefficients of cellulase enzymes on lignins and the changes of hydrolysis yields indicated that the inhibitory or stimulatory effects of organosolv lignins on enzymatic hydrolysis were governed by the distribution coefficients (R). The different R values probably were related to the electrostatic interactions, hydrophobic interactions and hydrogen bondings between enzymes and lignin.
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Affiliation(s)
- Chenhuan Lai
- College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing, Jiangsu 210037, China; Forest Products Laboratory and Center for Bioenergy and Bioproducts, Auburn University, 520 Devall Drive, Auburn, AL 36849, United States
| | - Maobing Tu
- Forest Products Laboratory and Center for Bioenergy and Bioproducts, Auburn University, 520 Devall Drive, Auburn, AL 36849, United States.
| | - Zhiqiang Shi
- Forest Products Laboratory and Center for Bioenergy and Bioproducts, Auburn University, 520 Devall Drive, Auburn, AL 36849, United States
| | - Ke Zheng
- College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing, Jiangsu 210037, China
| | - Luis G Olmos
- Department of Chemical and Natural Gas Engineering, Texas A&M University, 700 University Blvd, Kingsville, TX 78363, United States
| | - Shiyuan Yu
- College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing, Jiangsu 210037, China
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Lai C, Tu M, Li M, Yu S. Remarkable solvent and extractable lignin effects on enzymatic digestibility of organosolv pretreated hardwood. Bioresour Technol 2014; 156:92-9. [PMID: 24495536 DOI: 10.1016/j.biortech.2014.01.030] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 01/06/2014] [Accepted: 01/08/2014] [Indexed: 05/02/2023]
Abstract
Low solvent concentration effect on substrate digestibility of ethanol organosolv pretreated sweetgum was examined. Surprisingly, lower ethanol concentration in organosolv pretreatments resulted in faster initial rates and higher 72h hydrolysis yields in pretreated substrates. A strong correlation (r(2)=0.96) between pretreatment combined severity factor and residual xylan/glucan ratio was observed. The residual xylan/glucan ratio was associated with the initial hydrolysis rate closely. Furthermore, it was found that preserving extractable lignin in the pretreated substrates could improve enzymatic hydrolysis yield by 33%. This has an important implication in reducing the pretreatment and enzyme cost, because the typical solvent washing after pretreatment could be eliminated and preserving extractable lignin could reduce enzyme loading. Finally, we observed that xylan removal by xylanase could improve the initial rate by 53% and increase the 72h hydrolysis yield by 21%. The extractable lignin precipitation on pretreated substrates increased the 72h hydrolysis yield by 10%.
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Affiliation(s)
- Chenhuan Lai
- College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing, Jiangsu 210037, China; Forest Products Laboratory and Center for Bioenergy and Bioproducts, Auburn University, 520 Devall Drive, Auburn, AL 36849, United States
| | - Maobing Tu
- Forest Products Laboratory and Center for Bioenergy and Bioproducts, Auburn University, 520 Devall Drive, Auburn, AL 36849, United States.
| | - Mi Li
- Forest Products Laboratory and Center for Bioenergy and Bioproducts, Auburn University, 520 Devall Drive, Auburn, AL 36849, United States
| | - Shiyuan Yu
- College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing, Jiangsu 210037, China
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Das A, Ghosh U, Mohapatra PKD, Pati BR, Mondal KC. Study on thermodynamics and adsorption kinetics of purified endoglucanase (CMCase) from Penicillium notatum NCIM NO-923 produced under mixed solid-state fermentation of waste cabbage and bagasse. Braz J Microbiol 2012; 43:1103-11. [PMID: 24031934 PMCID: PMC3768859 DOI: 10.1590/s1517-838220120003000037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Revised: 10/09/2011] [Accepted: 06/07/2012] [Indexed: 03/19/2024] Open
Abstract
In the current study, one thermostable endoglucanase was purified from Penicillium notatum NCIM NO-923 through mixed solid state fermentation of waste cabbage and bagasse. The molecular weight of the purified enzyme was 55kDa as determined by SDS polyacrylamide gel electrophoresis (SDS-PAGE). The enzyme had low activation energy (Ea) of 36.39KJ mol(-1) for carboxymethyl cellulose hydrolysis and the enthalpy and entropy for irreversible inactivation was 87 kJ mol (-1) and 59.3 J mol (-1) K(-1) respectively. The enzyme was quite thermostable with a Tm value of 62.2°C. The pKa1 and pKa2 of ionizable groups of the active sites were 2.5 and 5.3 respectively. Apparent Km, Vmax and Kcat of the enzyme were found to be 5.2 mg mL(-1), 80 U/gds and 322.4 sec(-1) respectively. The enzyme showed about 1.4 fold increased activity in presence of 10mM MgSO4. Adsorption of endoglucanase on Avicel at wide pH range was studied at different temperatures. Langmuir type adsorption isotherm at 10°C showed maximum adsorption strength of enzyme at pH 3.0, which was in a range of optimum pH of the enzyme.
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Affiliation(s)
- Arpan Das
- Department of Microbiology, Vidyasagar University, Midnapore – 721102, West Bengal, India
| | - Uma Ghosh
- Food Technology and Biochemical Engineering Department, Jadavpur University Kolkata-700032, West Bengal, India
| | | | - Bikas Ranjan Pati
- Department of Microbiology, Vidyasagar University, Midnapore – 721102, West Bengal, India
| | - Keshab Chandra Mondal
- Department of Microbiology, Vidyasagar University, Midnapore – 721102, West Bengal, India
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