Physiological characteristics of Bacillus strains originated from dairy products and their impacts on rheological properties of pasteurised yoghurt

International Journal of Dairy Technology, Journal Year: 2025, Volume and Issue: 78(1)

Published: Feb. 1, 2025

Due to the strong stress resistance, causing food spoilage and toxin production of spore‐forming Bacillus species, their presence will be detrimental quality assurance dairy products. Impacts five strains ( licheniformis H1, B. H2, subtilis Z2, cereus Z6‐1 Z6‐2) originated from products on pasteurised yoghurt were investigated. Physiological characteristics strains, including growth, acid production, proteolysis, amylase extracellular polysaccharide biofilm formation, analysed. Additionally, changes in ‐contaminated during a 60‐day incubation at 28°C observed. strongly strain‐specific. Both had highest growth rate Brian Heart Infusion broth strongest proteolytic ability skimmed milk. Z2 exhibited activity, while yields polysaccharides obtained Z6‐2 H2. The acidic environment (about pH 4.2–4.4) was not suitable for Bacilli , as low survival after inoculation slow growth. Yoghurt contaminated with H1 showed resulting gel relatively elasticity. containing H2 high leading formation many interspersed holes. strain effect rheological properties yoghurt, lowest viscoelasticity. Protease mainly interferes thickness protein matrix affects size holes gel. residual may adversely affect particularly long shelf life.

Language: Английский

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Metal tolerance and biosorption capacities of bacterial strains isolated from an urban watershed

Frontiers in Microbiology, Journal Year: 2023, Volume and Issue: 14

Published: Oct. 23, 2023

Rapid industrialization and urbanization have led to widespread metal contamination in aquatic ecosystems. This study explores the tolerance biosorption characteristics of four bacterial strains ( Serratia sp. L2, Raoultella L30, Klebsiella R3, R19) isolated from Saint Clair River sediments. These effectively removed various cations (As 3+ , Pb 2+ Cu Mn Zn Cd Cr 6+ Ni ) single multi-metal solutions. Minimum inhibitory concentration (MIC) assays revealed strain-specific variations tolerance, with L2 L30 exhibiting higher tolerance. Surprisingly, R3 R19, despite lower demonstrated superior removal efficiency, challenging notion that dictates efficacy. In single-metal solutions, R19 excelled at extracting ions, while competitive binding solutions hindered removal. However, retained efficiencies, possibly due enhanced flocculation activities facilitating metal-ion contact. Comprehensive Fourier-transform infrared (FTIR) analysis highlighted strains’ metal-binding capabilities, novel peaks emerging after exposure, indicative extracellular polymeric substance (EPS) production. Scanning electron microscopy (SEM) energy-dispersive X-ray spectroscopy (EDX) confirmed accumulation on surfaces within cytoplasmic regions morphological changes adsorption patterns, emphasizing ability adapt stress. transmission (STEM) EDX uncovered cells, underscoring complexity microbial-metal interactions. also confirms simultaneous presence an aqueous solution may cause a mutual inhibition each EPS resulting reduced uptake, which emphasizes need select specific for given metal-containing effluent. The differences distribution patterns between suggest species-specific strategies driven by environmental conditions availability. heavy metal-removing capabilities grow over wide range concentrations used this offer advantage employ these organisms remediation bioreactors or situ .

Language: Английский

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Microalgal-based macro-hollow loofah fiber bio-composite for methylene blue removal: A promising step for a green adsorbent

International Journal of Biological Macromolecules, Journal Year: 2023, Volume and Issue: 253, P. 127009 - 127009

Published: Sept. 19, 2023

Language: Английский

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Different survival strategies of the phosphate-mineralizing bacterium Enterobacter sp. PMB-5 in response to cadmium stress: Biomineralization, biosorption, and bioaccumulation

Journal of Hazardous Materials, Journal Year: 2023, Volume and Issue: 465, P. 133284 - 133284

Published: Dec. 16, 2023

Language: Английский

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The halotolerant exopolysaccharide-producing Rhizobium azibense increases the salt tolerance mechanism in Phaseolus vulgaris (L.) by improving growth, ion homeostasis, and antioxidant defensive enzymes

Chemosphere, Journal Year: 2024, Volume and Issue: 360, P. 142431 - 142431

Published: May 24, 2024

Language: Английский

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N-acyl homoserine lactones (AHLs) enhanced removal of cadmium and other pollutants by algae-bacteria consortia

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 366, P. 121792 - 121792

Published: July 14, 2024

Language: Английский

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Adsorption-desorption of copper(II) by temperature-sensitive nano-biochar@PNIPAM/alginate double-network composite hydrogel: Enhanced mechanisms and application potentials

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 495, P. 153356 - 153356

Published: June 25, 2024

Language: Английский

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Biodegradation characteristics of p-Chloroaniline and the mechanism of co-metabolism with aniline by Pseudomonas sp. CA-1

Bioresource Technology, Journal Year: 2024, Volume and Issue: 406, P. 131086 - 131086

Published: July 7, 2024

Language: Английский

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Simultaneous biodegradation of polycyclic aromatic hydrocarbons and phthalates by bacterial consortium and its bioremediation for complex polluted soil and sewage sludge

Bioresource Technology, Journal Year: 2024, Volume and Issue: 408, P. 131161 - 131161

Published: July 26, 2024

Language: Английский

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To what content the chemical characteristics of sludge extracellular polymeric substances affect anaerobic digestion efficiency: A review

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 155490 - 155490

Published: Sept. 1, 2024

Language: Английский

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