Polyphasic, Including MALDI-TOF MS, Evaluation of Freeze-Drying Long-Term Preservation on <i>Aspergillus</i> (Section <i>Nigri</i>) Strains
This study aims to evaluate the effect of freeze-drying and long-term storage on the biotechnological potential of <i>Aspergillus</i> section <i>Nigri</i> strains. Twelve selected strains were freeze-dried and aged by accelerated storage, at 37 °C in the dark, for 2...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-08-01
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| Series: | Microorganisms |
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| Online Access: | https://www.mdpi.com/2076-2607/7/9/291 |
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| author | Rodrigo Rodriguez Carla Santos Marta F. Simões Célia Soares Cledir Santos Nelson Lima |
| author_facet | Rodrigo Rodriguez Carla Santos Marta F. Simões Célia Soares Cledir Santos Nelson Lima |
| author_sort | Rodrigo Rodriguez |
| collection | DOAJ |
| description | This study aims to evaluate the effect of freeze-drying and long-term storage on the biotechnological potential of <i>Aspergillus</i> section <i>Nigri</i> strains. Twelve selected strains were freeze-dried and aged by accelerated storage, at 37 °C in the dark, for 2 and 4 weeks. To assess possible changes as a consequence of the ageing in the freeze-drying ampoules, morphological characteristics, mycotoxins and enzymes production, matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALTI-TOF MS) spectra, and M13 phage probe fingerprinting were used as part of a polyphasic approach. Phenotypical changes were observed; nevertheless, they did not substantially affect the potential biotechnological use of these strains. The activity of hydrolytic enzymes (protease, carboxymethylcellulase, xylanase, pectinase and mannanase) was maintained or increased after freeze-drying. MALDI-TOF MS data originated spectra that grouped, for the majority of samples, according to strain independently of preservation time point. M13 profiles revealed the presence of some genetic polymorphisms after preservation. However, the three studied times still clustered for more than 50% of strains. Our results show that the studied strains maintain their biotechnological potential after preservation, with minimal phenotypic alterations. These findings provide evidence that freeze-drying preservation is a suitable option to preserve biotechnologically relevant aspergilli strains from section <i>Nigri</i>, and one should consider that the observed effects might be species/strain-dependent. |
| first_indexed | 2024-12-19T03:22:34Z |
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| id | doaj.art-1cb1dd91a33843ec9ae493d8fb8530c8 |
| institution | Directory Open Access Journal |
| issn | 2076-2607 |
| language | English |
| last_indexed | 2024-12-19T03:22:34Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Microorganisms |
| spelling | doaj.art-1cb1dd91a33843ec9ae493d8fb8530c82022-12-21T20:37:44ZengMDPI AGMicroorganisms2076-26072019-08-017929110.3390/microorganisms7090291microorganisms7090291Polyphasic, Including MALDI-TOF MS, Evaluation of Freeze-Drying Long-Term Preservation on <i>Aspergillus</i> (Section <i>Nigri</i>) StrainsRodrigo Rodriguez0Carla Santos1Marta F. Simões2Célia Soares3Cledir Santos4Nelson Lima5CEB-Centre of Biological Engineering, Micoteca da Universidade do Minho, University of Minho, 4710-057 Braga, PortugalCEB-Centre of Biological Engineering, Micoteca da Universidade do Minho, University of Minho, 4710-057 Braga, PortugalState Key Laboratory of Lunar and Planetary Sciences, Space Science Institute. Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau SAR 999078, ChinaCEB-Centre of Biological Engineering, Micoteca da Universidade do Minho, University of Minho, 4710-057 Braga, PortugalDepartment of Chemical Sciences and Natural Resources, BIOREN-UFRO Scientific and Technological Bioresource Nucleus, Universidad de La Frontera, Temuco 4811-230, ChileCEB-Centre of Biological Engineering, Micoteca da Universidade do Minho, University of Minho, 4710-057 Braga, PortugalThis study aims to evaluate the effect of freeze-drying and long-term storage on the biotechnological potential of <i>Aspergillus</i> section <i>Nigri</i> strains. Twelve selected strains were freeze-dried and aged by accelerated storage, at 37 °C in the dark, for 2 and 4 weeks. To assess possible changes as a consequence of the ageing in the freeze-drying ampoules, morphological characteristics, mycotoxins and enzymes production, matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALTI-TOF MS) spectra, and M13 phage probe fingerprinting were used as part of a polyphasic approach. Phenotypical changes were observed; nevertheless, they did not substantially affect the potential biotechnological use of these strains. The activity of hydrolytic enzymes (protease, carboxymethylcellulase, xylanase, pectinase and mannanase) was maintained or increased after freeze-drying. MALDI-TOF MS data originated spectra that grouped, for the majority of samples, according to strain independently of preservation time point. M13 profiles revealed the presence of some genetic polymorphisms after preservation. However, the three studied times still clustered for more than 50% of strains. Our results show that the studied strains maintain their biotechnological potential after preservation, with minimal phenotypic alterations. These findings provide evidence that freeze-drying preservation is a suitable option to preserve biotechnologically relevant aspergilli strains from section <i>Nigri</i>, and one should consider that the observed effects might be species/strain-dependent.https://www.mdpi.com/2076-2607/7/9/291freeze-dryingaccelerated ageingmass spectrometryDNA fingerprintingbiotechnological potential |
| spellingShingle | Rodrigo Rodriguez Carla Santos Marta F. Simões Célia Soares Cledir Santos Nelson Lima Polyphasic, Including MALDI-TOF MS, Evaluation of Freeze-Drying Long-Term Preservation on <i>Aspergillus</i> (Section <i>Nigri</i>) Strains Microorganisms freeze-drying accelerated ageing mass spectrometry DNA fingerprinting biotechnological potential |
| title | Polyphasic, Including MALDI-TOF MS, Evaluation of Freeze-Drying Long-Term Preservation on <i>Aspergillus</i> (Section <i>Nigri</i>) Strains |
| title_full | Polyphasic, Including MALDI-TOF MS, Evaluation of Freeze-Drying Long-Term Preservation on <i>Aspergillus</i> (Section <i>Nigri</i>) Strains |
| title_fullStr | Polyphasic, Including MALDI-TOF MS, Evaluation of Freeze-Drying Long-Term Preservation on <i>Aspergillus</i> (Section <i>Nigri</i>) Strains |
| title_full_unstemmed | Polyphasic, Including MALDI-TOF MS, Evaluation of Freeze-Drying Long-Term Preservation on <i>Aspergillus</i> (Section <i>Nigri</i>) Strains |
| title_short | Polyphasic, Including MALDI-TOF MS, Evaluation of Freeze-Drying Long-Term Preservation on <i>Aspergillus</i> (Section <i>Nigri</i>) Strains |
| title_sort | polyphasic including maldi tof ms evaluation of freeze drying long term preservation on i aspergillus i section i nigri i strains |
| topic | freeze-drying accelerated ageing mass spectrometry DNA fingerprinting biotechnological potential |
| url | https://www.mdpi.com/2076-2607/7/9/291 |
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