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Van Binh N, Quynh TM, An TX, Thao HP, Diep TB. Effects of EB irradiation on the properties of xanthan in solid state for utilization as adjuvant to improve foliar applications. VIETNAM JOURNAL OF CHEMISTRY 2024. [DOI: 10.1002/vjch.202300238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 11/21/2023] [Indexed: 07/05/2024]
Abstract
AbstractIn this study, xanthan was irradiated by electron beam accelerator (EB) in solid state and the viscosity and molecular weight of the irradiated xanthan were investigated to provide a better understanding on the EB radiation effect on molecular properties of xanthan. Both viscosity and molecular weight of xanthan were greatly decreased by EB at 25 kGy then slowly decreased with further increase of irradiation dose to 200 kGy. Contact angles and adhesion degrees of the irradiated xanthan solutions were rather smaller than those of commercial xanthan. These results suggested that the xanthan was EB irradiated at 100 kGy can be utilized as a good adjuvant to improve spraying application of foliar fertilizer for promoting the growth and yield of water spinach.
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Affiliation(s)
- Nguyen Van Binh
- Hanoi Irradiation Center Vietnam Atomic Energy Institute Km12 Minh Khai, Bac Tu Liem Hanoi Vietnam
| | - Tran Minh Quynh
- Hanoi Irradiation Center Vietnam Atomic Energy Institute Km12 Minh Khai, Bac Tu Liem Hanoi Vietnam
| | - Tran Xuan An
- Hanoi Irradiation Center Vietnam Atomic Energy Institute Km12 Minh Khai, Bac Tu Liem Hanoi Vietnam
| | - Hoang Phuong Thao
- Hanoi Irradiation Center Vietnam Atomic Energy Institute Km12 Minh Khai, Bac Tu Liem Hanoi Vietnam
| | - Tran Bang Diep
- Hanoi Irradiation Center Vietnam Atomic Energy Institute Km12 Minh Khai, Bac Tu Liem Hanoi Vietnam
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Nnyigide OS, Hyun K. Charge-induced low-temperature gelation of mixed proteins and the effect of pH on the gelation: A spectroscopic, rheological and coarse-grained molecular dynamics study. Colloids Surf B Biointerfaces 2023; 230:113527. [PMID: 37659199 DOI: 10.1016/j.colsurfb.2023.113527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 08/25/2023] [Accepted: 08/26/2023] [Indexed: 09/04/2023]
Abstract
We report the gelation of mixed proteins consisting of oppositely charged lysozyme and serum albumins at various pH. The results from rheological tests showed that at a pH of 7, the gelation temperature (Tgel) of the oppositely charged proteins was lower than the melting temperature (Tm) of the individual protein. To ascertain the conformational state of the proteins at the observed Tgel, the attenuated total-reflectance Fourier-transform infrared (ATR-FTIR) spectra of the proteins were acquired. The recorded spectra showed that the proteins were predominantly alpha helical, suggesting that the observed gelation was electrostatically triggered. However, as the solution pH was changed to acid or alkaline regime, all the proteins became similarly charged and showed Tgel < Tm which was attributed to pH-induced denaturation. Surprisingly, however, the serum albumins were remarkably stable at the alkaline pH of 9 and 10 but very labile at the acidic pH. In contrast, the LYZ was more stable at the acidic than alkaline pH. To understand the role of the opposite charges in the gelation, coarse-grained molecular dynamics (CGMD) simulations revealed an increase in the aggregation of the oppositely charged proteins compared with the pure or similarly charged protein mixture.
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Affiliation(s)
| | - Kyu Hyun
- School of Chemical Engineering, Pusan National University, Busan 46241, South Korea.
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Xiao YY, Zhang JT, Dong YH, Li SL, Zhi GY, Zhang YF, Zhang DH. Improving the Encapsulation Efficiency of Lipase in Molecular Cages and Its Application. Bioconjug Chem 2023. [PMID: 37097628 DOI: 10.1021/acs.bioconjchem.3c00127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
Abstract
Here, lipase encapsulation is constructed by locking enzyme molecules in nanomolecular cages on the surface of SH-PEI@PVAC magnetic microspheres. To improve the encapsulation efficiency in enzyme loading, the thiol group is efficiently modified on the grafted polyethyleneimine (PEI) using 3-mercaptopropionic acid. N2 adsorption-desorption isotherms reveal the existence of mesoporous molecular cages on the microsphere surface. The robust immobilizing strength of carriers to lipase demonstrates the successful encapsulation of enzymes in nanomolecular cages. The encapsulated lipase shows high enzyme loading (52.9 mg/g) and high activity (51.4 U/mg). Different sizes of molecular cages are established, and the cage size showed important effects on lipase encapsulation. It shows that enzyme loading is low at a small size of molecular cages, which is attributed to that the nanomolecular cage is too small to house lipase. The investigation in lipase conformation suggests that the encapsulated lipase retains its active conformation. Compared with the adsorbed lipase, the encapsulated lipase shows higher thermal stability (4.9 times) and higher resistance to denaturants (5.0 times). Encouragingly, the encapsulated lipase shows high activity and reusability in lipase-catalyzed synthesis of propyl laurate, suggesting the potential application value of encapsulated lipase.
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Affiliation(s)
- Yun-Yan Xiao
- College of Pharmaceutical Science, Hebei University, Baoding 071002, China
| | - Jiang-Tao Zhang
- College of Pharmaceutical Science, Hebei University, Baoding 071002, China
| | - Yong-Hua Dong
- College of Pharmaceutical Science, Hebei University, Baoding 071002, China
| | - Shu-Li Li
- College of Pharmaceutical Science, Hebei University, Baoding 071002, China
| | - Gao-Ying Zhi
- Department of Computer Teaching, Hebei University, Baoding 071002, China
| | - Ya-Fang Zhang
- Pharmacy Department, Baoding Children's Hospital, Baoding 071000, China
| | - Dong-Hao Zhang
- College of Pharmaceutical Science, Hebei University, Baoding 071002, China
- Key Laboratory of Pharmaceutical Quality Control of Hebei Province, College of Pharmaceutical Science, Hebei University, Baoding 071002, China
- Institute of Life Science and Green Development, Hebei University, Baoding 071002, China
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Valente ÉC, Polêto MD, de Oliveira TV, Soares LDS, dos Reis Coimbra JS, Guimarães AP, de Oliveira EB. Effects of the Cations Li+, Na+, K+, Mg2+, or Ca2+ on Physicochemical Properties of Xanthan Gum in Aqueous Medium – A view from Computational Molecular Dynamics Calculations. FOOD BIOPHYS 2022. [DOI: 10.1007/s11483-022-09773-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Xanthan gum in aqueous solutions: Fundamentals and applications. Int J Biol Macromol 2022; 216:583-604. [DOI: 10.1016/j.ijbiomac.2022.06.189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 06/24/2022] [Accepted: 06/28/2022] [Indexed: 11/24/2022]
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Wang Y, Selomulya C. Food rheology applications of large amplitude oscillation shear (LAOS). Trends Food Sci Technol 2022. [DOI: 10.1016/j.tifs.2022.05.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Dzionek A, Wojcieszyńska D, Guzik U. Use of xanthan gum for whole cell immobilization and its impact in bioremediation - a review. BIORESOURCE TECHNOLOGY 2022; 351:126918. [PMID: 35231596 DOI: 10.1016/j.biortech.2022.126918] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/23/2022] [Accepted: 02/24/2022] [Indexed: 06/14/2023]
Abstract
Xanthan gum is one of the exo-polysaccharides produced by bacteria and is characterized by unique non-Newtonian properties. Its structure and conformation strongly depend on the fermentation conditions and such factors as temperature and ions concentration. The properties of the xanthan gum were appreciated in the controlled drug delivery but in the crosslinked form. Due to its ability to enhance the survival rate of immobilized bacteria, the potential of a crosslinked form is promising. Unfortunately, xanthan gum crosslinking procedures often require toxic substances or harsh environmental conditions, which cannot be used in the entrapment of living cells. In this study, we summarised a crosslinking method that could potentially be modified to reduce its toxicity to living cells. Moreover, this review also includes using xanthan gum in bioremediation studies and possible utilization methods to avoid carrier accumulation in the environment.
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Affiliation(s)
- Anna Dzionek
- University of Silesia in Katowice, Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, Jagiellońska 28, 40-032 Katowice, Poland.
| | - Danuta Wojcieszyńska
- University of Silesia in Katowice, Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, Jagiellońska 28, 40-032 Katowice, Poland
| | - Urszula Guzik
- University of Silesia in Katowice, Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, Jagiellońska 28, 40-032 Katowice, Poland
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Song HY, Park SY, Kim S, Youn HJ, Hyun K. Linear and nonlinear oscillatory rheology of chemically pretreated and non-pretreated cellulose nanofiber suspensions. Carbohydr Polym 2022; 275:118765. [PMID: 34742451 DOI: 10.1016/j.carbpol.2021.118765] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 09/24/2021] [Accepted: 10/06/2021] [Indexed: 11/02/2022]
Abstract
Linear and nonlinear rheological properties of cellulose nanofiber (CNF) suspensions were measured under small and large amplitude oscillatory shear (SAOS and LAOS) flow. Four different CNFs were produced, two by only mechanical disintegration and two with chemical pretreatments. Linear viscoelastic properties distinguished chemically treated CNFs from two untreated fibers via a different scaling exponent of the elastic modulus. However, different mechanical fibrillation degree was not characterized via linear viscoelastic properties. In contrast, nonlinear viscoelastic properties reflected both effects of chemical pretreatments and mechanical fibrillation. More fibrillated CNFs exhibited nonlinear rheological phenomena at larger deformations. In addition, chemically treated CNFs exhibited greater network stiffness and higher network recovery rates due to the presence of charged functional groups on the fiber surfaces. A material-property co-plot showed that network stiffness and recovery rate were in a trade-off relationship.
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Affiliation(s)
- Hyeong Yong Song
- Institute for Environment and Energy, Pusan National University, Busan 46241, Republic of Korea
| | - Shin Young Park
- Department of Forest Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Sunhyung Kim
- Platform Technology, Corporate R&D, LG Chem. Ltd., Gwacheon-si, Gyeonggi-do 13818, Republic of Korea
| | - Hye Jung Youn
- Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul 08826, Republic of Korea; Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Kyu Hyun
- Institute for Environment and Energy, Pusan National University, Busan 46241, Republic of Korea; School of Applied Chemical Engineering, Pusan National University, Busan 46241, Republic of Korea.
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