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Valorization of agro-wastes for the biosynthesis and characterization of polyhydroxybutyrate by Bacillus sp. isolated from rice bran dumping yard. 3 Biotech 2021; 11:202. [PMID: 33927992 DOI: 10.1007/s13205-021-02722-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 03/10/2021] [Indexed: 11/27/2022] Open
Abstract
Investigations have been made to determine the usage of inexpensive agro-waste products as an alternative carbon source for the production of degradable bacterial polyester. Among 33 bacterial isolates, a gram-positive bacterium PPECLRB-16 isolated from rice bran dumping yard was found to accumulate a relatively higher quantity of PHB and identified as Bacillus sp. through 16S rRNA gene sequence analysis. The higher PHB producing bacterial isolate was grown with different inexpensive agro-wastes to determine the suitable carbon source for its growth and PHB production. The one-factor-at-a-time approach comparatively enhanced PHB yield (5.64 g/L) when grown for 48 h with 1.5% (w/v) of defatted oil cake at a pH of 7.0. The bacterially accumulated PHB was isolated from the cells, purified, and characterized using solid-state 13C NMR, FT-IR, Powder XRD, TGA, GPC, Tensile and HR-SEM analyses. The hydrophobicity and printing accessibility of recovered PHB were demonstrated using contact angle measurement by coating on different surfaces. The results obtained in the present investigation have thrown light on the potential usage of agro-waste by-products, mainly oil cake, as an appropriate carbon source for the commercial production of PHB by Bacillus sp. in a cost-effective way.
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Krishnan S, Chinnadurai GS, Ravishankar K, Raghavachari D, Perumal P. Statistical augmentation of polyhydroxybutyrate production by Isoptericola variabilis: Characterization, moulding, in vitro cytocompatibility and biodegradability evaluation. Int J Biol Macromol 2020; 166:80-97. [PMID: 33096176 DOI: 10.1016/j.ijbiomac.2020.10.089] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 10/02/2020] [Accepted: 10/12/2020] [Indexed: 02/08/2023]
Abstract
This study aimed to explore the production of polyhydroxybutyrate (PHB), a polyhydroxyalkanoate (PHA), which has been widely considered as a potential substitute for the synthetic polymers. Among 53 actinomycete isolates, 11 of them were found to be PHB positive and the quantity of PHB from the positive isolates varied from 10.5 to 29.82 wt% on a dry cell weight basis. A strain designated as PPLAT 012, accumulated relatively higher PHB and has been identified as Isoptericola variabilis by 16S rRNA gene sequence analysis. An effort has also been made to optimize the PHB production by the hyper-producing strain using the conventional, one-factor-at-a-time, and statistical response surface methodologies and the maximum PHB production (46.18%) in DSMZ medium, amended with 12% glucose and 9% potassium nitrate with a pH of 7.0. Further, the characteristic properties such as processability, cytocompatibility and biodegradability of the extracted PHB was also demonstrated. The physical properties of the recovered PHB was further improved by blending with PLA and the resultant blends were characterized. The present investigation has demonstrated that the isolate, Isoptericola variabilis, could be utilized as a potential source for the production of PHB with desirable characteristics, suitable for biomedical applications.
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Affiliation(s)
- Sivakumar Krishnan
- Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai 600 025, India
| | - Gandhi Shree Chinnadurai
- Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai 600 025, India
| | - Kartik Ravishankar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | | | - Palani Perumal
- Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai 600 025, India.
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Li H, Göstl R, Delgove M, Sweeck J, Zhang Q, Sijbesma RP, Heuts JPA. Promoting Mechanochemistry of Covalent Bonds by Noncovalent Micellar Aggregation. ACS Macro Lett 2016; 5:995-998. [PMID: 35614648 DOI: 10.1021/acsmacrolett.6b00579] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Optical reporting of covalent bond scission in self-assembled structures in water is an important step toward the detection of forces in biological systems. Here we show that micelles of a diblock copolymer comprising hydrophobic poly(butyl acrylate) and hydrophilic poly(acrylic acid) blocks connected by an off-center mechanoresponsive moiety are mechanochemically active when sonicated in aqueous solution. Facile optical read-out of the force-activation is warranted by formation of a blue-fluorescent anthracene cleavage from the mechanophore, an anthracene-maleimide Diels-Alder adduct. In contrast to the efficient bond scission when the block copolymers are noncovalently anchored in liquid-like micellar cores, isolated unimers in solution are not activated by ultrasonication because the dimensions and viscous drag are drastically lower. These results demonstrate that covalent mechanochemistry can be enabled by noncovalent interactions.
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Affiliation(s)
- Hui Li
- Key
Laboratory of Applied Physics and Chemistry in Space of Ministry of
Education, School of Science, Northwestern Polytechnical University, 710072 Xi’an, Shaanxi, China
| | - Robert Göstl
- Laboratory
of Supramolecular Polymer Chemistry, Institute for Complex Molecular
Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Marie Delgove
- Laboratory
of Supramolecular Polymer Chemistry, Institute for Complex Molecular
Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Joren Sweeck
- Laboratory
of Supramolecular Polymer Chemistry, Institute for Complex Molecular
Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Qiuyu Zhang
- Key
Laboratory of Applied Physics and Chemistry in Space of Ministry of
Education, School of Science, Northwestern Polytechnical University, 710072 Xi’an, Shaanxi, China
| | - Rint P. Sijbesma
- Laboratory
of Supramolecular Polymer Chemistry, Institute for Complex Molecular
Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Johan P. A. Heuts
- Laboratory
of Supramolecular Polymer Chemistry, Institute for Complex Molecular
Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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Neugebauer D, Bury K, Pendziałek K. High molecular weight diblock and ABA/ABC triblock copolymers of tert-butyl (meth)acrylate. POLYM INT 2012. [DOI: 10.1002/pi.4164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Sundaram HS, Raghavachari D. Controlled radical polymerization of tert-butyl acrylate at ambient temperature: Effect of initiator structure and synthesis of amphiphilic block copolymers. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.25856] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Munirasu S, Karunakaran RG, Rühe J, Dhamodharan R. Synthesis and morphological study of thick benzyl methacrylate-styrene diblock copolymer brushes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:13284-13292. [PMID: 21928787 DOI: 10.1021/la202855u] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We demonstrate, for the first time, the synthesis of model poly(benzyl methacrylate) [P(BnMA)] brushes of very high thickness (>300 nm) on silicon wafer. P(BnMA) brush is also synthesized from the surface of silica nanoparticles, from a covalently anchored initiator monolayer, using ambient temperature ATRP. The kinetic studies and block copolymerization from the surface anchored P(BnMA)-Br macroinitiator showed that the polymerization was controlled in nature. AFM, ellipsometry, and water contact angle were used for the characterization of the polymer brush. The grafting density of the P(BnMA) brush, formed by immersion in a dilute monomer solution, was relatively less (∼11% less) in comparison to that obtained by immersion in neat monomer under similar conditions. The P(BnMA)-Br macroinitiator brushes were used to synthesize P(BnMA-b-S) diblock copolymer brushes by the ATRP of styrene at 95 °C. The P(BnMA-b-S) brushes showed stimulus response to a selective solvent and various nanopatterns were observed according to the composition of the block copolymer.
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Affiliation(s)
- Selvaraj Munirasu
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India
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Raus V, Štěpánek M, Uchman M, Šlouf M, Látalová P, Čadová E, Netopilík M, Kříž J, Dybal J, Vlček P. Cellulose-based graft copolymers with controlled architecture prepared in a homogeneous phase. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24876] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rajendrakumar K, Dhamodharan R. Spontaneous Cu(I)Br–PMDETA‐mediated polymerization of isobornyl methacrylate in heterogeneous aqueous medium at ambient temperature. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24646] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - R. Dhamodharan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, India
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Haridharan N, Ramkumar V, Dhamodharan R. Exploration of Novel Pyrene Labeled Amphiphilic Block Copolymers: Synthesis Via ATRP, Characterization and Properties. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2010. [DOI: 10.1080/10601325.2010.501681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ren W, Jiang L, Wang W, Dan Y. The application of copper(II) deactivator on the single-electron transfer living radical polymerization of tert-butyl acrylate. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24031] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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