Thermal and Rheological Properties of a Family of Botryosphaerans Produced by Botryosphaeria rhodina MAMB-05
Abstract
:1. Introduction
2. Results and Discussion
2.1. DSC Studies
2.2. Thermogravimetric Studies
2.3. FT-IR Spectroscopy Studies
2.4. Rheological Analysis
Concentration (g/L) | EPSGLC | EPSSUC | EPSFRU | |||
---|---|---|---|---|---|---|
k * | a | k * | a | k * | a | |
1 | 0.005 | 0.863 | 0.002 | 0.891 | 0.002 | 0.966 |
2 | 0.006 | 0.860 | 0.003 | 0.900 | 0.002 | 0.960 |
3 | 0.008 | 0.833 | 0.003 | 0.921 | 0.003 | 0.891 |
4 | 0.180 | 0.560 | 0.015 | 0.736 | 0.006 | 0.834 |
5 | 0.265 | 0.533 | 0.084 | 0.621 | 0.018 | 0.730 |
Samples | Extent of branching (%) * | Proportion of branches (%) * | Elution volume (mL) ** | η0 of EPS solution (mPa.s) at substrate concentration of (g/L) | ||
---|---|---|---|---|---|---|
Glucose | Gentiobiose | 1 | 5 | |||
EPSGLC | 22 | 6 | 16 | 20.8 | 3.27 | 120.52 |
EPSSUC | 21 | 12 | 9 | 21.3 | 2.08 | 33.24 |
EPSFRU | 31 | 16 | 15 | 22.4 | 1.34 | 6.96 |
2.5. Capillary Viscometry
3. Experimental
3.1. Production of Botryosphaeran
3.2. Differential Scanning Calorimetry (DSC)
3.3. Thermogravimetric (TG) Analysis
3.4. Fourier-Transform Infra-red Spectroscopy (FT-IR)
3.5. Gel permeation Chromatography
3.6. Rheology
4. Conclusions
Acknowledgements
Conflict of Interest
- Sample Availability: Samples of the different botryosphaerans are available from the authors (Contact: Dr. Aneli M. Barbosa, E-Mail: [email protected]).
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Fonseca, P.R.M.S.; Dekker, R.F.H.; Barbosa, A.M.; Silveira, J.L.M.; Vasconcelos, A.F.D.; Monteiro, N.K.; Aranda-Selverio, G.; Da Silva, M.d.L.C. Thermal and Rheological Properties of a Family of Botryosphaerans Produced by Botryosphaeria rhodina MAMB-05. Molecules 2011, 16, 7488-7501. https://doi.org/10.3390/molecules16097488
Fonseca PRMS, Dekker RFH, Barbosa AM, Silveira JLM, Vasconcelos AFD, Monteiro NK, Aranda-Selverio G, Da Silva MdLC. Thermal and Rheological Properties of a Family of Botryosphaerans Produced by Botryosphaeria rhodina MAMB-05. Molecules. 2011; 16(9):7488-7501. https://doi.org/10.3390/molecules16097488
Chicago/Turabian StyleFonseca, Paulo R.M.S., Robert F.H. Dekker, Aneli M. Barbosa, Joana L.M. Silveira, Ana F.D. Vasconcelos, Nilson K. Monteiro, Gabriel Aranda-Selverio, and Maria de Lourdes Corradi Da Silva. 2011. "Thermal and Rheological Properties of a Family of Botryosphaerans Produced by Botryosphaeria rhodina MAMB-05" Molecules 16, no. 9: 7488-7501. https://doi.org/10.3390/molecules16097488