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Bazana LCG, Carvalho ÂR, Mace M, Fuentefria AM. The influence of the microwave oven on the production of solid culture medium and quality of microbial growth. AN ACAD BRAS CIENC 2022; 94:e20211104. [PMID: 35857966 DOI: 10.1590/0001-3765202220211104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 09/18/2021] [Indexed: 11/22/2022] Open
Abstract
Numerous cultivation media currently exist, whether selective, non-selective, enrichment or identification. However, they all have a common goal, which is the growth of microorganisms; the constitution and quality of the culture medium must favor it. For this reason, an important factor that directly affects the quality of a culture medium is its production. Thus, this article investigated the use of a microwave oven in the production of Sabouraud dextrose agar (SDA), and the microbial inactivation compared to the autoclave in a microbiology laboratory. The quality of the medium, time exposure, and sterilization potential were performed using fungal strains of Candida spp., Cryptococcus spp., Microsporum spp., and Aspergillus spp. The results showed that the advantages of the use of a microwave oven for the preparation of SDA are practicality, speed, lower energy expense, pH, and constituents preservation of the culture medium, resulting in a richer growth compared to autoclaved SDA. The multivariate analysis of digital images allowed the detection of melanoidins (brownish tone of medium), which are responsible for the negative influence on the microorganisms growth. This research shows the use of the microwave oven as an efficient alternative for the production of the culture medium and maintaining their best quality.
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Affiliation(s)
- Luana C G Bazana
- Universidade Federal do Rio Grande do Sul, Programa de Pós-graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Departamento de Análises Clínicas, Rua São Luis, n° 154, Santana, Anexo 2, 90620-170 Porto Alegre, RS, Brazil
| | - Ânderson R Carvalho
- Universidade Federal do Rio Grande do Sul, Programa de Pós-graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Departamento de Análises Clínicas, Rua São Luis, n° 154, Santana, Anexo 2, 90620-170 Porto Alegre, RS, Brazil
| | - Manoela Mace
- Universidade Federal do Rio Grande do Sul, Programa de Pós-graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Departamento de Análises Clínicas, Rua São Luis, n° 154, Santana, Anexo 2, 90620-170 Porto Alegre, RS, Brazil
| | - Alexandre M Fuentefria
- Universidade Federal do Rio Grande do Sul, Programa de Pós-graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Departamento de Análises Clínicas, Rua São Luis, n° 154, Santana, Anexo 2, 90620-170 Porto Alegre, RS, Brazil
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Goh YK, Marzuki NF, Tan SY, Tan SS, Tung HJ, Goh YK, Goh KJ. Experimental mixture design as a tool to optimize the growth of various Ganoderma species cultivated on media with different sugars. Mycology 2016; 7:36-44. [PMID: 30123614 PMCID: PMC6059077 DOI: 10.1080/21501203.2015.1137985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 12/23/2015] [Indexed: 11/01/2022] Open
Abstract
The influence of different medium components (glucose, sucrose, and fructose) on the growth of different Ganoderma isolates and species was investigated using mixture design. Ten sugar combinations based on three simple sugars were generated with two different concentrations, namely 3.3% and 16.7%, which represented low and high sugar levels, respectively. The media were adjusted to either pH 5 or 8. Ganoderma isolates (two G. boninense from oil palm, one Ganoderma species from coconut palm, G. lingzhi, and G. australe from tower tree) grew faster at pH 8. Ganoderma lingzhi proliferated at the slowest rate compared to all other tested Ganoderma species in all the media studied. However, G. boninense isolates grew the fastest. Different Ganoderma species were found to have different sugar preferences. This study illustrated that the mixture design can be used to determine the optimal combinations of sugar or other nutrient/chemical components of media for fungal growth.
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Affiliation(s)
- Yit Kheng Goh
- Advanced Agriecological Research Sdn Bhd, No. 11 Jalan Teknologi 3/6, Taman Sains Selangor 1, Kota Damansara, Petaling Jaya, Selangor Darul Ehsan47810, Malaysia
| | - Nurul Fadhilah Marzuki
- Advanced Agriecological Research Sdn Bhd, No. 11 Jalan Teknologi 3/6, Taman Sains Selangor 1, Kota Damansara, Petaling Jaya, Selangor Darul Ehsan47810, Malaysia
| | - Suet Yee Tan
- Advanced Agriecological Research Sdn Bhd, No. 11 Jalan Teknologi 3/6, Taman Sains Selangor 1, Kota Damansara, Petaling Jaya, Selangor Darul Ehsan47810, Malaysia
| | - Swee Sian Tan
- Advanced Agriecological Research Sdn Bhd, No. 11 Jalan Teknologi 3/6, Taman Sains Selangor 1, Kota Damansara, Petaling Jaya, Selangor Darul Ehsan47810, Malaysia
| | - Hun Jiat Tung
- Applied Agricultural Resources Sdn Bhd (AAR), University of Nottingham Malaysia Campus (UNMC) Biotechnology Research Centre, Jalan Broga, Semenyih, Selangor43500, Malaysia
| | - You Keng Goh
- Advanced Agriecological Research Sdn Bhd, No. 11 Jalan Teknologi 3/6, Taman Sains Selangor 1, Kota Damansara, Petaling Jaya, Selangor Darul Ehsan47810, Malaysia
| | - Kah Joo Goh
- Advanced Agriecological Research Sdn Bhd, No. 11 Jalan Teknologi 3/6, Taman Sains Selangor 1, Kota Damansara, Petaling Jaya, Selangor Darul Ehsan47810, Malaysia
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Influence of oxyR on Growth, Biofilm Formation, and Mobility of Vibrio parahaemolyticus. Appl Environ Microbiol 2015; 82:788-96. [PMID: 26590276 DOI: 10.1128/aem.02818-15] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 11/12/2015] [Indexed: 12/18/2022] Open
Abstract
Vibrio parahaemolyticus is a common marine food-borne enteropathogen. In this study, we examined the antioxidative activity, growth, biofilm formation, and cell mobility of an oxyR deletion mutant and its genetically complementary strain of V. parahaemolyticus. oxyR is the regulator of catalase and ahpC genes. Protection against extrinsic H2O2 and against the organic peroxides cumene hydroperoxide and tert-butyl hydroperoxide was weaker in the deletion mutant than in its parent strain. Expression of the major functional antioxidative genes, ahpC1 and VPA1418, was markedly decreased in the oxyR mutant. Growth of this mutant on agar medium was significantly inhibited by autoclaved 0.25% glucose and by 0.25% dipotassium hydrogen phosphate, 0.5% monosaccharides (glucose, galactose, xylose, and arabinose), or 114.8 mM phosphates. The inhibition of the growth of this oxyR mutant by extrinsic peroxides, autoclaved sugars, and phosphates was eliminated by the complementary oxyR gene or by the addition of catalase to the autoclaved medium, while no inhibition of growth was observed when filter-sterilized sugars were used. The formation of biofilm and swimming mobility were significantly inhibited in the oxyR mutant relative to that in the wild-type strain. This investigation demonstrates the antioxidative function of oxyR in V. parahaemolyticus and its possible roles in biofilm formation, cell mobility, and the protection of growth in heated rich medium.
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