The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte Microcapsules
Polyelectrolyte microcapsules, which are obtained by the method of alternate adsorption of oppositely charged polyelectrolytes onto colloidal particles of micron size, are widely used in science and industry. Nevertheless, the properties of microcapsules are still poorly understood. In particular, t...
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| Format: | Article |
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MDPI AG
2021-11-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/22/4026 |
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| author | Alexey V. Dubrovskii Aleksandr L. Kim Egor V. Musin Bulat R. Ramazanov Sergey A. Tikhonenko |
| author_facet | Alexey V. Dubrovskii Aleksandr L. Kim Egor V. Musin Bulat R. Ramazanov Sergey A. Tikhonenko |
| author_sort | Alexey V. Dubrovskii |
| collection | DOAJ |
| description | Polyelectrolyte microcapsules, which are obtained by the method of alternate adsorption of oppositely charged polyelectrolytes onto colloidal particles of micron size, are widely used in science and industry. Nevertheless, the properties of microcapsules are still poorly understood. In particular, there is no information in the literature on the buffer capacity. However, information on the presence of a buffer capacity and an understanding of its mechanisms can both simplify the use of microcapsules and expand the scope of their application. In this regard, the buffer capacity of various types of microcapsules was studied. It was found that polyelectrolyte microcapsules consisting of polyallylamine, and polystyrene sulfonate have a buffer capacity. In addition, in an acidic medium, the buffer capacity of microcapsules containing BSA is significantly greater than that of microcapsules without protein. This is due to the fact that BSA contributes to the buffering of microcapsules. Differences in the behaviour of the buffer capacity of microcapsules with the composition (PAH/PSS)<sub>3</sub> and (PSS/PAH)<sub>3</sub> were found. In addition, a hypothesis has been proposed that regions of unbound polyallylamine are responsible for the buffering properties of polyelectrolyte microcapsules. This hypothesis is confirmed by the fact that incubation of microcapsules in 0.5 M NaCl increases the amount of unbound polyallylamine, which leads to an increase in the buffer capacity of microcapsules at alkaline pH values higher than the buffer capacity of capsules in an aqueous solution. |
| first_indexed | 2024-03-10T05:07:08Z |
| format | Article |
| id | doaj.art-959de3786bfc4c418fe1d47575d88214 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T05:07:08Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-959de3786bfc4c418fe1d47575d882142023-11-23T01:10:40ZengMDPI AGPolymers2073-43602021-11-011322402610.3390/polym13224026The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte MicrocapsulesAlexey V. Dubrovskii0Aleksandr L. Kim1Egor V. Musin2Bulat R. Ramazanov3Sergey A. Tikhonenko4Institute of Theoretical and Experimental Biophysics Russian Academy of Science, Institutskaya st., 3, 142290 Puschino, RussiaInstitute of Theoretical and Experimental Biophysics Russian Academy of Science, Institutskaya st., 3, 142290 Puschino, RussiaInstitute of Theoretical and Experimental Biophysics Russian Academy of Science, Institutskaya st., 3, 142290 Puschino, RussiaFaculty of Biology, M. V. Lomonosov Moscow State University, 119991 Moscow, RussiaInstitute of Theoretical and Experimental Biophysics Russian Academy of Science, Institutskaya st., 3, 142290 Puschino, RussiaPolyelectrolyte microcapsules, which are obtained by the method of alternate adsorption of oppositely charged polyelectrolytes onto colloidal particles of micron size, are widely used in science and industry. Nevertheless, the properties of microcapsules are still poorly understood. In particular, there is no information in the literature on the buffer capacity. However, information on the presence of a buffer capacity and an understanding of its mechanisms can both simplify the use of microcapsules and expand the scope of their application. In this regard, the buffer capacity of various types of microcapsules was studied. It was found that polyelectrolyte microcapsules consisting of polyallylamine, and polystyrene sulfonate have a buffer capacity. In addition, in an acidic medium, the buffer capacity of microcapsules containing BSA is significantly greater than that of microcapsules without protein. This is due to the fact that BSA contributes to the buffering of microcapsules. Differences in the behaviour of the buffer capacity of microcapsules with the composition (PAH/PSS)<sub>3</sub> and (PSS/PAH)<sub>3</sub> were found. In addition, a hypothesis has been proposed that regions of unbound polyallylamine are responsible for the buffering properties of polyelectrolyte microcapsules. This hypothesis is confirmed by the fact that incubation of microcapsules in 0.5 M NaCl increases the amount of unbound polyallylamine, which leads to an increase in the buffer capacity of microcapsules at alkaline pH values higher than the buffer capacity of capsules in an aqueous solution.https://www.mdpi.com/2073-4360/13/22/4026polyelectrolyte microcapsulesmicrocapsulesbuffer capacitypolyelectrolyte |
| spellingShingle | Alexey V. Dubrovskii Aleksandr L. Kim Egor V. Musin Bulat R. Ramazanov Sergey A. Tikhonenko The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte Microcapsules Polymers polyelectrolyte microcapsules microcapsules buffer capacity polyelectrolyte |
| title | The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte Microcapsules |
| title_full | The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte Microcapsules |
| title_fullStr | The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte Microcapsules |
| title_full_unstemmed | The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte Microcapsules |
| title_short | The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte Microcapsules |
| title_sort | discovery of the buffer capacity of various types of polyelectrolyte microcapsules |
| topic | polyelectrolyte microcapsules microcapsules buffer capacity polyelectrolyte |
| url | https://www.mdpi.com/2073-4360/13/22/4026 |
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