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Zhang M, Wei T, Mai Q, Hayat K, Hou Y, Xia S, Cui H, Yu J. Microwave-induced heterogeneity in protein conformation and water mobility interferes with the distribution pattern and migration pathway of sodium ion in myofibrillar protein gel. Food Chem 2024; 460:140503. [PMID: 39053279 DOI: 10.1016/j.foodchem.2024.140503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Revised: 06/26/2024] [Accepted: 07/16/2024] [Indexed: 07/27/2024]
Abstract
The aim of this study was to investigate the distribution pattern and migration pathway of sodium ion in the myofibrillar protein (MP) gel matrix during microwave heating. The results showed that the content of sodium ions in the outer layer of MP gel increased by 47.85% compared with that in the inner layer. In the inner layer of protein gel, the non-covalent disulfide bonds (mainly ε(γ-Glu)-Lys) increased (P < 0.05), which contributed to the formation of a better rigid structure of the protein. The free water content was significantly higher than that of the inner layer (P < 0.05), which was related to the higher mobility of sodium ions. The results of microstructure analysis showed that the outer layer of the MP gel formed a more porous network than the inner layer. This work is expected to give some insights into the development of promising salt-reduced meat products by microwave heating.
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Affiliation(s)
- Min Zhang
- State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu, 214122, PR China; School of Food Science and Technology, Collaborative Innovation Center of Food Safety and Quality Control, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, PR China
| | - Tianyi Wei
- Guangdong Midea Kitchen Appliances Manufacturing Co., Ltd, 6 Yongan Road, Foshan, Guangdong, 528311, PR China
| | - Qianting Mai
- Guangdong Midea Kitchen Appliances Manufacturing Co., Ltd, 6 Yongan Road, Foshan, Guangdong, 528311, PR China
| | - Khizar Hayat
- Department of Kinesiology, Nutrition, and Health, Miami University, Oxford, OH 45056, United States
| | - Yaqi Hou
- State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu, 214122, PR China; School of Food Science and Technology, Collaborative Innovation Center of Food Safety and Quality Control, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, PR China
| | - Shuqin Xia
- State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu, 214122, PR China; School of Food Science and Technology, Collaborative Innovation Center of Food Safety and Quality Control, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, PR China.
| | - Heping Cui
- State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu, 214122, PR China; School of Food Science and Technology, Collaborative Innovation Center of Food Safety and Quality Control, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, PR China
| | - Jingyang Yu
- State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu, 214122, PR China; School of Food Science and Technology, Collaborative Innovation Center of Food Safety and Quality Control, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, PR China
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2
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Jiao X, Chen W, Fan D. Behind the Veil: A multidisciplinary discussion on protein–microwave interactions. Curr Opin Food Sci 2022. [DOI: 10.1016/j.cofs.2022.100936] [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]
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3
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Monitoring the Process of Anaerobic Digestion of Native and Microwave Pre-Treated Sludge by Dielectric and Rheological Measurements. WATER 2022. [DOI: 10.3390/w14081294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The anaerobic digestion (AD) of wastewater sludge presents a promising and efficient method of wastewater and sludge treatment, as it can lower the organic content of sludge while producing a renewable source of energy—biogas—at the same time. However, using native, non-treated industrial wastewater sludge as a substrate for AD may present difficulties, hence we focused our research primarily on the applicability of measuring techniques—viscosity and dielectric measurement. One of our research goals was to investigate the presence of any connection between the aforementioned properties and the overall biogas production, in order to prove whether these measurement techniques were capable of monitoring the process of AD. Our other aim was to investigate how microwave (MW) pre-treatment affected the anaerobic fermentation. Our results revealed that in terms of total biogas yield, microwave irradiation could enhance fermentation by 14%, and also reduced the viscosity of the fermentation media by 13%. However, microwave irradiation did not change the overall tendencies of the AD process regarding these aspects. Moreover, it was discovered that dielectric and absolute viscosity measurements were effective methods for monitoring the fermentation. Additionally, a correlation was found between the accumulating biogas yield, the dielectric constant and loss factor, and the absolute viscosity of the digested media—each of these share a similarity in tendency and can indicate the occurrence of different phases during batch anaerobic fermentation.
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4
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Do non-thermal effects exist in microwave heating of glucose aqueous solutions? Evidence from molecular dynamics simulations. Food Chem 2021; 375:131677. [PMID: 34865928 DOI: 10.1016/j.foodchem.2021.131677] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 11/20/2021] [Accepted: 11/22/2021] [Indexed: 11/23/2022]
Abstract
The existence of microwave non-thermal effects in food processing is still debated. In this study, molecular dynamics (MD) simulations were performed to investigate the conformation, electrostatic profiles, and intramolecular hydrogen bonds (intra-HB) of glucose in aqueous solution under alternating electric fields of microwaves ranging from 0 to 109 V/m at 2.45 GHz. The results showed a field-induced threshold of 109 V/m. At the threshold, alternating microwaves reoriented the flexible moieties and thus enhanced the intra-HB. The conformational transition among gg, gt, and tg conformers at 109 V/m possibly resulted from the uneven electrostatic potential and the increased intra-HB. In practice, the maximum electric field of microwaves is several times weaker than the threshold, verifying the absence of microwave non-thermal effects for glucose molecules in food processing. This study provides a novel strategy to evaluate the potential non-thermal effects of microwaves in food processing and the related underlying food safety issues.
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Costa HCDB, Siguemoto ÉS, Cavalcante TABB, de Oliveira Silva D, Vieira LGM, Gut JAW. Effect of microwave-assisted processing on polyphenol oxidase and peroxidase inactivation kinetics of açai-berry (Euterpe oleracea) pulp. Food Chem 2020; 341:128287. [PMID: 33059272 DOI: 10.1016/j.foodchem.2020.128287] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 09/28/2020] [Accepted: 09/29/2020] [Indexed: 10/23/2022]
Abstract
Microwave heating has been considered a promising technology for continuous flow thermal processing of fluid foods due to better retention of quality. Considering the importance of açai-berry pulp and its perishability, the inactivation kinetics of peroxidase (POD) and polyphenol oxidase (PPO) were investigated under conventional and microwave heating. First-order two-component model was well fitted to the data, indicating the presence of at least two fractions with different resistances. POD was more thermally resistant (90% inactivation for 40 s at 89 °C) and could be considered as a processing target. Inactivation curves dependency on heating technology suggests specific effects of microwaves on the protein structure. Additionally, the dielectric properties of açai-berry pulp were evaluated at 915 and 2,450 MHz for temperatures up to 120 °C. Power penetration depth dropped with temperature at 915 MHz (from 29 to 11 mm), but was less affected at 2,450 MHz (between 8 and 11 mm).
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Affiliation(s)
- Henrique Coutinho de Barcelos Costa
- Department of Food Engineering. Universidade Federal de São João del Rei, Sete Lagoas, Brazil; School of Chemical Engineering. Universidade Federal de Uberlândia, Uberlândia, Brazil
| | - Érica Sayuri Siguemoto
- Department of Chemical Engineering, Escola Politécnica, Universidade de São Paulo, São Paulo, Brazil
| | | | | | | | - Jorge Andrey Wilhelms Gut
- Department of Chemical Engineering, Escola Politécnica, Universidade de São Paulo, São Paulo, Brazil; FoRC - Food Research Center, Universidade de São Paulo, São Paulo, Brazil.
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7
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Kubo MTK, Siguemoto ÉS, Funcia ES, Augusto PED, Curet S, Boillereaux L, Sastry SK, Gut JAW. Non-thermal effects of microwave and ohmic processing on microbial and enzyme inactivation: a critical review. Curr Opin Food Sci 2020. [DOI: 10.1016/j.cofs.2020.01.004] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Rivera-Albarran ME, Ray SJ. A Novel Combined Microstrip Resonator/Nanospray Ionization Source for Microwave-Assisted Trypsin Digestion of Proteins. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2020; 31:1684-1696. [PMID: 32573245 DOI: 10.1021/jasms.0c00115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Enzymatic digestion of proteins is a critical step in bottom-up and middle-down proteomics. Here, we demonstrate a method for decreasing the time required for proteolytic digestion of proteins from multiple hours to minutes by using an in-line microstrip cavity for programmed microwave heating. When a nanospray emitter tip, containing a digestion sample, is exposed to a region of highly focused microwave field, the rate of proteolytic digestion is enhanced and the time required for digestion greatly decreased. The design is advantageous for mass spectrometry because the solution-based digestion can then be directly sprayed from a nanoelectrospray tip emitter, decreasing sample transfer loss and allowing the system to be used in a flow-through proteolytic workflow. Microwave-assisted digestion using this method is evaluated against standard overnight digestion protocols using a variety of proteins, evaluating sequence coverage and observed peptide location, digestion rate, and overall efficacy. The influence of applied microwave power is investigated, and enzymatic kinetic parameters are evaluated to estimate temperature within the microreactor. Finally, the modulation of the proteolytic digestion of proteins based upon the modulation of applied microwave power is demonstrated on a time scale of seconds in a flow-through system.
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Affiliation(s)
- Maria E Rivera-Albarran
- Department of Chemistry, The State University of New York at Buffalo, Buffalo, New York 14260, United States
| | - Steven J Ray
- Department of Chemistry, The State University of New York at Buffalo, Buffalo, New York 14260, United States
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9
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Liu X, Cheng K, Jia G. Investigation of nonlinear dielectric response of DMSO-methanol mixture by molecular dynamics simulation. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111678] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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10
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11
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Horikoshi S, Nakamura K, Yashiro M, Kadomatsu K, Serpone N. Probing the effect(s) of the microwaves' electromagnetic fields in enzymatic reactions. Sci Rep 2019; 9:8945. [PMID: 31221996 PMCID: PMC6586677 DOI: 10.1038/s41598-019-45152-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 05/29/2019] [Indexed: 11/30/2022] Open
Abstract
This paper examines the effects that electromagnetic fields from microwave radiation have in enzymatic reactions. Hydrolysis of proteins in beef (in vivo case) and casein (in vitro case) by the papain enzyme, a major industrial enzyme, is used herein as a model reaction to assess, under highly controlled conditions, the various parameters of microwave radiation (electric field, magnetic field, pulsed microwave irradiation, continuous microwave irradiation) as they might influence these in vivo and in vitro enzymatic reactions. The effect(s) of the microwaves’ electromagnetic fields was clearly evidenced in the in vivo case, contrary to the in vitro case where no such effect was observed, likely due to the nature of the hydrolysis reaction and to the autolysis (self-digestion) of the papain enzyme. Additionally, the effect of pulsed versus continuous microwave irradiation was further assessed by examining the catalase-assisted decomposition of hydrogen peroxide.
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Affiliation(s)
- Satoshi Horikoshi
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioicho, Chiyodaku, Tokyo, 102-8554, Japan.
| | - Kota Nakamura
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioicho, Chiyodaku, Tokyo, 102-8554, Japan
| | - Mikio Yashiro
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioicho, Chiyodaku, Tokyo, 102-8554, Japan
| | - Kanae Kadomatsu
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioicho, Chiyodaku, Tokyo, 102-8554, Japan
| | - Nick Serpone
- PhotoGreen Laboratory, Dipartimento di Chimica, Universita di Pavia, Via Taramelli 12, Pavia, 27100, Italy
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12
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Martysiak-Żurowska D, Puta M, Kiełbratowska B. The effect of convective heating and microwave heating on antioxidant enzymes in pooled mature human milk. Int Dairy J 2019. [DOI: 10.1016/j.idairyj.2018.12.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Jákói Z, Hodúr C, László Z, Beszédes S. Detection of the efficiency of microwave-oxidation process for meat industry wastewater by dielectric measurement. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 78:2141-2148. [PMID: 30629542 DOI: 10.2166/wst.2018.491] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Our experimental work focused on the applicability of a quite novel process for wastewater treatment, i.e. a microwave (MW) irradiation-enhanced Fenton-like method. The aim of our research was to detect and evaluate the efficiency of this oxidation process, during the treatment of meat industry wastewater containing a high concentration of organic material. The efficiency was defined by the measurement of the change in COD (chemical oxygen demand, with an initial COD value of 1,568 mg L-1), and with the determination of dielectric parameters during the process. It can be summarized that MW irradiation could assist in a Fenton-like oxidation process to achieve higher organic matter removal. Furthermore, our experimental results and statistical analysis show that there can be found a correlation between the effects of applied MW energy and the dosage of H2O2/FeSO4. If the intensity of MW irradiation and the amount of FeSO4 were set higher, the decrease of COD and the increase of tanδ (the dielectric loss tangent) were definitely more significant. With the application of 60 kJ MWE and a 0.14 mgFe2+/mgCOD dosage, the COD removal efficiency was more than 40%, and the increment of tanδ was nearly threefold. Considering the effects of MW-specific process parameters, it can be concluded that the power intensity of MW-oxidation treatment has a significant effect on COD decrease, if the irradiated MW energy was set at lower (30-45 kJ) levels.
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Affiliation(s)
- Zoltán Jákói
- Department of Process Engineering, Faculty of Engineering, University of Szeged, Moszkvai krt. 9., HU-6725 Szeged, Hungary E-mail:
| | - Cecilia Hodúr
- Institute of Environmental Science and Technology, University of Szeged, Közép fasor 52, HU-6726 Szeged, Hungary
| | - Zsuzsanna László
- Department of Process Engineering, Faculty of Engineering, University of Szeged, Moszkvai krt. 9., HU-6725 Szeged, Hungary E-mail:
| | - Sándor Beszédes
- Department of Process Engineering, Faculty of Engineering, University of Szeged, Moszkvai krt. 9., HU-6725 Szeged, Hungary E-mail:
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14
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Combined microwave processing and enzymatic proteolysis of bovine whey proteins: the impact on bovine β-lactoglobulin allergenicity. Journal of Food Science and Technology 2018; 56:177-186. [PMID: 30728559 DOI: 10.1007/s13197-018-3471-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 10/09/2018] [Accepted: 10/19/2018] [Indexed: 10/27/2022]
Abstract
The main aim of this study was to develop a continuous microwave treatment system of whey proteins and then apply this process at 37 °C, 50 °C, 65 °C and 70 °C to achieve pepsinolysis and produce extensively hydrolysed bovine whey protein hydrolysates with low allergenic properties. The microwave process was compared to a conventional thermal treatment with similar temperature set points. Both processes were deeply analysed in terms of the thermal kinetics and operating conditions. The pepsin hydrolysates obtained by the continuous microwave treatment and conventional heating were characterized by SDS-PAGE and RP-HPLC. The allergenicity of the whey protein hydrolysates was explored using a human IgE sensitized rat basophil leukaemia cell assay. The results indicate that extensively hydrolysed whey protein hydrolysates were obtained by microwave only at 65 °C and in a shorter time compared with the conventional thermal treatment. In the same temperature conditions under conventional heating, β-lactoglobulin was resistant to pepsinolysis, and 37% of it remained intact. As demonstrated by an in vitro degranulation assay using specific human IgE-sensitized rat basophils, the extensively hydrolysed whey protein obtained by microwave showed maximum degranulation values of 6.53% compared to those of the native whey protein isolate (45.97%) and hence elicited no more allergenic reactions in basophils. This work emphasizes the potential industrial use of microwave heating specific to milk protein processing to reduce their allergenicity and improve their end-use properties.
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15
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Cao H, Fan D, Jiao X, Huang J, Zhao J, Yan B, Zhou W, Zhang W, Ye W, Zhang H, Chen W. Intervention of transglutaminase in surimi gel under microwave irradiation. Food Chem 2018; 268:378-385. [PMID: 30064772 DOI: 10.1016/j.foodchem.2018.06.067] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 05/19/2018] [Accepted: 06/14/2018] [Indexed: 10/28/2022]
Abstract
Transglutaminase (TGase) was selected as model enzyme to investigate the effects of microwave (MW) heating on its activity and structure compared to water bath (WB) heating. MW heating can enhance the activity of TGase and reach the maximum at 20 min, whereas conduction heating has little effect on the activity of TGase. The difference of dielectric properties between MW heating and WB heating were not obvious, but MW heating had higher conductivity than WB heating. The results of ultraviolet and fluorescence spectra show that MW heating can change the enzyme activity by changing the conformation of TGase. The decrease of α-helix and an increase of β-sheet and β-turn investigated by circular dichroism (CD) indicated the secondary structures of TGase were changed when treated by MW heating. Further gel properties test confirmed that TGase treated by MW could improve the functional and mechanical properties of surimi gel.
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Affiliation(s)
- Hongwei Cao
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Daming Fan
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Key Laboratory of Refrigeration and Conditioning Aquatie Products Processing, Ministry of Agriculture and Rural Affairs, Xiamen 361022, China; National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Wuxi 214122, China.
| | - Xidong Jiao
- National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Jianlian Huang
- Key Laboratory of Refrigeration and Conditioning Aquatie Products Processing, Ministry of Agriculture and Rural Affairs, Xiamen 361022, China
| | - Jianxin Zhao
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Wuxi 214122, China
| | - Bowen Yan
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Wenguo Zhou
- Key Laboratory of Refrigeration and Conditioning Aquatie Products Processing, Ministry of Agriculture and Rural Affairs, Xiamen 361022, China
| | - Wenhai Zhang
- Key Laboratory of Refrigeration and Conditioning Aquatie Products Processing, Ministry of Agriculture and Rural Affairs, Xiamen 361022, China
| | - Weijian Ye
- Key Laboratory of Refrigeration and Conditioning Aquatie Products Processing, Ministry of Agriculture and Rural Affairs, Xiamen 361022, China
| | - Hao Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Wuxi 214122, China
| | - Wei Chen
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Wuxi 214122, China
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16
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Zhou M, Cheng K, Sun H, Jia G. Investigation of Nonlinear Output-Input Microwave Power of DMSO-Ethanol Mixture by Molecular Dynamics Simulation. Sci Rep 2018; 8:7186. [PMID: 29739957 PMCID: PMC5940686 DOI: 10.1038/s41598-018-21846-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 02/06/2018] [Indexed: 11/14/2022] Open
Abstract
The nonlinear response of output-input microwave power for DMSO-ethanol mixture, which was exhibited as the direct evidence of non-thermal effect in experiment, was investigated by molecular dynamics simulation. Effects of microwave field on the mixture were evaluated from the alteration in structure, transport, hydrogen bonding dynamics and intermolecular interaction energy. Increasing the strength of the microwave field did not lead to any markedly conformational change, but decrease the diffusion coefficient. Prolonged hydrogen bonding lifetimes, which caused by the redistribution of microwave energy, was also detected. Distinct threshold effect was observed, which was consistent with the behavior in the experiment.
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Affiliation(s)
- Min Zhou
- College of Physical and Electronics Engineering, Sichuan Normal University, Chengdu, 610101, China
| | - Ke Cheng
- College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu, 610103, China
| | - Haoran Sun
- College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu, 610103, China
| | - Guozhu Jia
- College of Physical and Electronics Engineering, Sichuan Normal University, Chengdu, 610101, China.
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17
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Wang H, Drake SK, Youn JH, Rosenberg AZ, Chen Y, Gucek M, Suffredini AF, Dekker JP. Peptide Markers for Rapid Detection of KPC Carbapenemase by LC-MS/MS. Sci Rep 2017; 7:2531. [PMID: 28566732 PMCID: PMC5451396 DOI: 10.1038/s41598-017-02749-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 04/19/2017] [Indexed: 12/18/2022] Open
Abstract
Carbapenemase producing organisms (CPOs) represent an urgent public health threat, and the need for new rapid methods to detect these organisms has been widely recognized. CPOs carrying the Klebsiella pneumoniae carbapenemase (blaKPC) gene have caused outbreaks globally with substantial attributable mortality. Here we describe the validation of a rapid MS method for the direct detection of unique tryptic peptides of the KPC protein in clinical bacterial isolates with an isolate-to-result time of less than 90 minutes. Using a genoproteomic discovery approach that combines theoretical peptidome analysis and liquid chromatography-tandem MS (LC-MS/MS), we selected three high abundance peptide markers of the KPC protein that can be robustly detected following rapid tryptic digestion. Protein BLAST analysis confirmed that the chosen peptide markers were unique to KPC. A blinded validation set containing 20 KPC-positive and 80 KPC-negative clinical isolates, performed in triplicate (300 runs) demonstrated 100% sensitivity and 100% specificity (60/60 positive identifications, 240/240 negative identifications) using defined rules for positive calls. The most robust tryptic peptide marker in the validation was LTLGSALAAPQR. The peptide discovery and detection methods validated here are general and should be broadly applicable to allow the direct and rapid detection of other resistance determinants.
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Affiliation(s)
- Honghui Wang
- Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Steven K Drake
- Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Jung-Ho Youn
- Microbiology Service, Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Avi Z Rosenberg
- Kidney Disease Section, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA.,Department of Pathology, Johns Hopkins University, Baltimore, Maryland, USA
| | - Yong Chen
- Proteomics Core Facility, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Marjan Gucek
- Proteomics Core Facility, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Anthony F Suffredini
- Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - John P Dekker
- Microbiology Service, Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA.
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18
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Montowska M, Pospiech E. Processed Meat Protein and Heat-Stable Peptide Marker Identification Using Microwave-Assisted Tryptic Digestion. Food Technol Biotechnol 2016; 54:482-488. [PMID: 28115907 DOI: 10.17113/ftb.54.04.16.4540] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
New approaches to rapid examination of proteins and peptides in complex food matrices are of great interest to the community of food scientists. The aim of the study is to examine the influence of microwave irradiation on the acceleration of enzymatic cleavage and enzymatic digestion of denatured proteins in cooked meat of five species (cattle, horse, pig, chicken and turkey) and processed meat products (coarsely minced, smoked, cooked and semi-dried sausages). Severe protein aggregation occurred not only in heated meat under harsh treatment at 190 °C but also in processed meat products. All the protein aggregates were thoroughly hydrolyzed after 1 h of trypsin treatment with short exposure times of 40 and 20 s to microwave irradiation at 138 and 303 W. There were much more missed cleavage sites observed in all microwave-assisted digestions. Despite the incompleteness of microwave-assisted digestion, six unique peptide markers were detected, which allowed unambiguous identification of processed meat derived from the examined species. Although the microwave-assisted tryptic digestion can serve as a tool for rapid and high-throughput protein identification, great caution and pre-evaluation of individual samples is recommended in protein quantitation.
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Affiliation(s)
- Magdalena Montowska
- Institute of Meat Technology, Poznan University of Life Sciences, Wojska Polskiego 31,
PL-60-624 Poznan, Poland
| | - Edward Pospiech
- Institute of Meat Technology, Poznan University of Life Sciences, Wojska Polskiego 31,
PL-60-624 Poznan, Poland
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19
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Ahirwar R, Tanwar S, Bora U, Nahar P. Microwave non-thermal effect reduces ELISA timing to less than 5 minutes. RSC Adv 2016. [DOI: 10.1039/c5ra27261k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Microwave-mediated ELISA, which occurs in less than 5 minutes, is due to a microwave non-thermal effect. We postulate that the microwave non-thermal effect is a microwave catalytic effect acting by lowering the activation energy of reactants.
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Affiliation(s)
- Rajesh Ahirwar
- CSIR-Institute of Genomics and Integrative Biology
- Mall Road Delhi
- India-110007
- Academy of Scientific and Innovative Research
- CSIR-IGIB
| | - Swati Tanwar
- CSIR-Institute of Genomics and Integrative Biology
- Mall Road Delhi
- India-110007
| | - Utpal Bora
- Department of Biosciences and Bioengineering
- Indian Institute of Technology
- Guwahati
- India
| | - Pradip Nahar
- CSIR-Institute of Genomics and Integrative Biology
- Mall Road Delhi
- India-110007
- Academy of Scientific and Innovative Research
- CSIR-IGIB
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20
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Horikoshi S, Nakamura K, Kawaguchi M, Kondo J, Serpone N. Effect of microwave radiation on the activity of catalase. decomposition of hydrogen peroxide under microwave and conventional heating. RSC Adv 2016. [DOI: 10.1039/c6ra04532d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The effect of microwave heating on the activity of a well-known enzyme (catalase) was elucidated by examining the catalase-assisted decomposition of hydrogen peroxide at various heating times (0 to 12 min).
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Affiliation(s)
- Satoshi Horikoshi
- Department of Materials & Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Kota Nakamura
- Department of Materials & Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Mari Kawaguchi
- Department of Materials & Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Jiro Kondo
- Department of Materials & Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Nick Serpone
- PhotoGreen Laboratory
- Dipartimento di Chimica
- Universita di Pavia
- Pavia 27100
- Italy
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21
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Farhadpour M, Hashempour H, Talebpour Z, A-Bagheri N, Shushtarian MS, Gruber CW, Ghassempour A. Microwave-assisted extraction of cyclotides from Viola ignobilis. Anal Biochem 2015; 497:83-9. [PMID: 26706804 DOI: 10.1016/j.ab.2015.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 11/10/2015] [Accepted: 12/03/2015] [Indexed: 01/15/2023]
Abstract
Cyclotides are an interesting family of circular plant peptides. Their unique three-dimensional structure, comprising a head-to-tail circular backbone chain and three disulfide bonds, confers them stability against thermal, chemical, and enzymatic degradation. Their unique stability under extreme conditions creates an idea about the possibility of using harsh extraction methods such as microwave-assisted extraction (MAE) without affecting their structures. MAE has been introduced as a potent extraction method for extraction of natural compounds, but it is seldom used for peptide and protein extraction. In this work, microwave irradiation was applied to the extraction of cyclotides. The procedure was performed in various steps using a microwave instrument under different conditions. High-performance liquid chromatography (HPLC) and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) results show stability of cyclotide structures on microwave radiation. The influential parameters, including time, temperature, and the ratio of solvents that are affecting the MAE potency, were optimized. Optimal conditions were obtained at 20 min of irradiation time, 1200 W of system power in 60 °C, and methanol/water at the ratio of 90:10 (v/v) as solvent. The comparison of MAE results with maceration extraction shows that there are similarities between cyclotide sequences and extraction yields.
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Affiliation(s)
- Mohsen Farhadpour
- Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Evin, Tehran, Iran
| | - Hossein Hashempour
- Department of Chemistry, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, Tabriz, Iran
| | - Zahra Talebpour
- Department of Chemistry, Alzahra University, Vanac, Tehran, Iran
| | - Nazanin A-Bagheri
- Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Evin, Tehran, Iran
| | | | - Christian W Gruber
- Center for Physiology and Pharmacology, Medical University of Vienna, 1090 Vienna, Austria
| | - Alireza Ghassempour
- Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Evin, Tehran, Iran.
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22
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Beyond classical derivatization: analyte ‘derivatives’ in the bioanalysis of endogenous and exogenous compounds. Bioanalysis 2015; 7:2501-13. [DOI: 10.4155/bio.15.171] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The analysis of endogenous and exogenous analytes in biological matrices presents several challenges to the bioanalyst. These analytes are often present at low concentrations, typically in complex matrices, and may have physicochemical properties that are not amenable to LC–MS analysis. The bioanalyst thus relies heavily on the formation of analyte derivatives for the efficient quantification of these compounds. These derivatives are also critically employed to derive information on the biology of living systems, potential drug or disease targets, and biomarkers of drug efficacy, safety, or disease progression. In this perspective, we demonstrate how analyte derivatives are applied in modern bioanalytical workflows and we discuss the potential use of these derivatives in the future.
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23
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Ma C, Qu J, Meisner J, Zhao X, Li X, Wu Z, Zhu H, Yu Z, Li L, Guo Y, Song J, Wang PG. Convenient and Precise Strategy for Mapping N-Glycosylation Sites Using Microwave-Assisted Acid Hydrolysis and Characteristic Ions Recognition. Anal Chem 2015; 87:7833-9. [PMID: 26161579 DOI: 10.1021/acs.analchem.5b02177] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
N-glycosylation is one of the most prevalence protein post-translational modifications (PTM) which is involved in several biological processes. Alternation of N-glycosylation is associated with cellular malfunction and development of disease. Thus, investigation of protein N-glycosylation is crucial for diagnosis and treatment of disease. Currently, deglycosylation with peptide N-glycosidase F is the most commonly used technique in N-glycosylation analysis. Additionally, a common error in N-glycosylation site identification, resulting from protein chemical deamidation, has largely been ignored. In this study, we developed a convenient and precise approach for mapping N-glycosylation sites utilizing with optimized TFA hydrolysis, ZIC-HILIC enrichment, and characteristic ions of N-acetylglucosamine (GlcNAc) from higher-energy collisional dissociation (HCD) fragmentation. Using this method, we identified a total of 257 N-glycosylation sites and 144 N-glycoproteins from healthy human serum. Compared to deglycosylation with endoglycosidase, this strategy is more convenient and efficient for large scale N-glycosylation sites identification and provides an important alternative approach for the study of N-glycoprotein function.
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Affiliation(s)
| | - Jingyao Qu
- §National Glycoengineering Research Center and The State Key Laboratory of Microbial Technology, Shandong University, Jinan, Shandong 250100, People's Republic of China
| | | | - Xinyuan Zhao
- ‡National Institute of Biological Sciences, Beijing 102206, People's Republic of China
| | | | | | | | | | | | | | | | - Peng George Wang
- §National Glycoengineering Research Center and The State Key Laboratory of Microbial Technology, Shandong University, Jinan, Shandong 250100, People's Republic of China
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24
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Application of Microwave Irradiation and Heat to Improve Gliadin Detection and Ricin ELISA Throughput with Food Samples. Toxins (Basel) 2015; 7:2135-44. [PMID: 26110503 PMCID: PMC4488694 DOI: 10.3390/toxins7062135] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 06/03/2015] [Accepted: 06/04/2015] [Indexed: 11/17/2022] Open
Abstract
The utility of microwave irradiation to accelerate the onset of equilibrium and improve ELISA performance was examined using ELISAs for the detection of the plant toxin ricin and gliadin. The ricin ELISA normally requires several one hour incubations at 37 °C, a total assay time of approximately five hours, and employs a complex buffer containing PBS, Tween-20®, and non-fat milk. Different energy levels and pulse designs were compared to the use of abbreviated incubation times at 37 °C for the detection of ricin in food. The use of microwave irradiation had no significant advantage over the application of heat using an oven incubator and performed worse with some foods. In contrast, a gliadin ELISA that relied on 30 min incubation steps at room temperature and a salt-based buffer performed better upon irradiation but also displayed improvement upon incubating the microtiter plate at 37 °C. Whether microwave irradiation was advantageous compared to incubation in an oven was inconclusive. However, by abbreviating the incubation time of the ricin ELISA, it was possible to cut the assay time to less than 2 hours and still display LOD values < 10 ppb and recoveries of 78%–98%.
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25
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Wang H, Schütte C. Building Markov State Models for Periodically Driven Non-Equilibrium Systems. J Chem Theory Comput 2015; 11:1819-31. [DOI: 10.1021/ct500997y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Han Wang
- CAEP Software Center for High Performance Numerical Simulation, Beijing, China
- Zuse Institute Berlin (ZIB), Berlin, Germany
| | - Christof Schütte
- Zuse Institute Berlin (ZIB), Berlin, Germany
- Institute
for Mathematics, Freie Universität Berlin, Berlin, Germany
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26
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Dittrich J, Becker S, Hecht M, Ceglarek U. Sample preparation strategies for targeted proteomics via proteotypic peptides in human blood using liquid chromatography tandem mass spectrometry. Proteomics Clin Appl 2014; 9:5-16. [PMID: 25418444 DOI: 10.1002/prca.201400121] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Revised: 10/29/2014] [Accepted: 11/18/2014] [Indexed: 11/07/2022]
Abstract
The simultaneous quantification of protein concentrations via proteotypic peptides in human blood by liquid chromatography coupled to quadrupole MS/MS is an important field of bioanalytical research with a high potential for routine diagnostic applications. This review summarizes currently available sample preparation procedures and trends for absolute protein quantification in blood using LC-MS/MS. It discusses approaches of transferring established qualitative protocols to a quantitative analysis regarding their reliability and reproducibility. Techniques used to enhance method sensitivity such as the depletion of high-abundant proteins or the immunoaffinity enrichment of proteins and peptides are described. Furthermore, workflows for (i) protein denaturation, (ii) disulfide bridge reduction and (iii) thiol alkylation as well as (iv) enzymatic digestion for absolute protein quantification are presented. The main focus is on the tryptic digestion as a bottleneck of protein quantification via proteotypic peptides. Conclusively, requirements for a high-throughput application are discussed.
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Affiliation(s)
- Julia Dittrich
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Hospital Leipzig, Leipzig, Germany; LIFE - Leipzig Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany
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27
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da Costa JP, Oliveira-Silva R, Daniel-da-Silva AL, Vitorino R. Bionanoconjugation for Proteomics applications — An overview. Biotechnol Adv 2014; 32:952-70. [DOI: 10.1016/j.biotechadv.2014.04.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 03/15/2014] [Accepted: 04/26/2014] [Indexed: 12/29/2022]
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28
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Beyer C, Christen P, Jelesarov I, Fröhlich J. Real-time assessment of possible electromagnetic-field-induced changes in protein conformation and thermal stability. Bioelectromagnetics 2014; 35:470-8. [PMID: 25123495 DOI: 10.1002/bem.21865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 06/12/2014] [Indexed: 01/20/2023]
Abstract
Previous studies on possible interactions of radiofrequency electromagnetic fields (RF EMFs) with proteins have suggested that RF EMFs might affect protein structure and folding kinetics. In this study, the isolated thermosensor protein GrpE of the Hsp70 chaperone system of Escherichia coli was exposed to EMFs of various frequencies and field strengths under strictly controlled conditions. Circular dichroism spectroscopy was used to monitor possible structural changes. Simultaneously, temperature was recorded at each point of observation. The coiled-coil part of GrpE has been reported to undergo a well-defined and fully reversible folding/unfolding transition, thus facilitating the differentiation between thermal and non-thermal effects of RF EMFs. Any direct effect of EMF on the conformation and/or stability would result in a shift of the conformational equilibrium of the protein at a given temperature. Possible immediate (t ≤ 0.1 s) and delayed (t ≥ 30 s) effects of RF EMFs were investigated with sinusoidal signals of 0.1, 1.0, and 1.9 GHz at various field strengths up to 5.0 kV/m and with GSM signals at 0.3 kV/m in the protein solution. Taking the overall uncertainty of the experimental system into account, possible RF EMF-induced shifts in the conformational equilibrium of less than 1% of its total range might have been detected. The results obtained with the different experimental protocols indicate, however, that the conformational equilibrium of GrpE is insensitive to electromagnetic fields in the tested range of frequency and field strength.
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Affiliation(s)
- Christian Beyer
- Laboratory for Electromagnetics Fields and Microwave Electronics (IFH), ETH Zurich, Zurich, Switzerland
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29
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Plagemann R, Langermann J, Kragl U. Microwave‐assisted covalent immobilization of enzymes on inorganic surfaces. Eng Life Sci 2014. [DOI: 10.1002/elsc.201300115] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
| | - Jan Langermann
- Institute of Chemistry University of Rostock Rostock Germany
| | - Udo Kragl
- Institute of Chemistry University of Rostock Rostock Germany
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30
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Astrakas LG, Gousias C, Tzaphlidou M. Electric field effects on alanine tripeptide in sodium halide solutions. Electromagn Biol Med 2014; 34:361-9. [PMID: 25006865 DOI: 10.3109/15368378.2014.936065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The electric field effects on conformational properties of trialanine in different halide solutions were explored with long-scale molecular dynamics simulations. NaF, NaCl, NaBr and NaI solutions of low (0.2 M) and high (2 M) concentrations were exposed to a constant electric field of 1000 V/m. Generally, the electric field does not disturb trialanine's structure. Large structural changes appear only in the case of the supersaturated 2.0 M NaF solution containing NaF crystals. Although the electric field affects in a complex way, all the ions-water-peptide interactions, it predominantly affects the electroselectivity effect, which describes specific interactions such as the ion-pair formation.
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Affiliation(s)
- Loukas G Astrakas
- a Laboratories of Medical Physics , Medical School, University of Ioannina , Ioannina , Greece
| | - Christos Gousias
- a Laboratories of Medical Physics , Medical School, University of Ioannina , Ioannina , Greece
| | - Margaret Tzaphlidou
- a Laboratories of Medical Physics , Medical School, University of Ioannina , Ioannina , Greece
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31
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Wang X, Li Y, He X, Chen S, Zhang JZH. Effect of strong electric field on the conformational integrity of insulin. J Phys Chem A 2014; 118:8942-52. [PMID: 24796962 DOI: 10.1021/jp501051r] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A series of molecular dynamics (MD) simulations up to 1 μs for bovine insulin monomer in different external electric fields were carried out to study the effect of external electric field on conformational integrity of insulin. Our results show that the secondary structure of insulin is kept intact under the external electric field strength below 0.15 V/nm, but disruption of secondary structure is observed at 0.25 V/nm or higher electric field strength. Although the starting time of secondary structure disruption of insulin is not clearly correlated with the strength of the external electric field ranging between 0.15 and 0.60 V/nm, long time MD simulations demonstrate that the cumulative effect of exposure time under the electric field is a major cause for the damage of insulin's secondary structure. In addition, the strength of the external electric field has a significant impact on the lifetime of hydrogen bonds when it is higher than 0.60 V/nm. The fast evolution of some hydrogen bonds of bovine insulin in the presence of the 1.0 V/nm electric field shows that different microwaves could either speed up protein folding or destroy the secondary structure of globular proteins deponding on the intensity of the external electric field.
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Affiliation(s)
- Xianwei Wang
- State Key Laboratory of Precision Spectroscopy, Department of Physics, Institute of Theoretical and Computational Science, East China Normal University , Shanghai 200062, China
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32
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Wang H, Schütte C, Ciccotti G, Delle Site L. Exploring the Conformational Dynamics of Alanine Dipeptide in Solution Subjected to an External Electric Field: A Nonequilibrium Molecular Dynamics Simulation. J Chem Theory Comput 2014; 10:1376-86. [DOI: 10.1021/ct400993e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Han Wang
- Institute
for Mathematics, Freie Universität Berlin, 14195 Berlin, Germany
| | - Christof Schütte
- Institute
for Mathematics, Freie Universität Berlin, 14195 Berlin, Germany
- Zuse Institute Berlin, 14195 Berlin, Germany
| | - Giovanni Ciccotti
- School
of Physics, University College Dublin, Belfield, Dublin 4, Ireland
- Dipartimento
di Fisica, Università “La Sapienza” and CNISM, Piazzale Aldo Moro 5, 00185 Roma, Italy
| | - Luigi Delle Site
- Institute
for Mathematics, Freie Universität Berlin, 14195 Berlin, Germany
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33
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Evaluating the potential nonthermal microwave effects of microwave-assisted proteolytic reactions. J Proteomics 2013; 80:160-70. [DOI: 10.1016/j.jprot.2013.01.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 01/09/2013] [Accepted: 01/09/2013] [Indexed: 11/18/2022]
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