Enhancement in physicochemical parameters and microbial populations of mushrooms as influenced by nano-coating treatments

AbstractWhite button mushrooms are greatly high perishable and can deteriorate within a few days after harvesting due to physicomechanical damage, respiration, microbial growth of the delicate epidermal structure. For that reason, the present research work was applied to evaluate the effect of chitosan combination with nano-coating treatments on physicochemical parameters and microbial populations on button mushrooms at chilling storage. Nano coating with the addition of nisin 1% (CHSSN/M) established the minimum value for weight loss 12.18%, maintained firmness 11.55 N, and color index profile. Moreover, O2% rate of (CHSSN/M) mushrooms was the lowest at 1.78%; while the highest rate was reported for CO2 24.88% compared to the untreated samples (Control/M) on day 12. Both pH and total soluble solid concentrations increased during storage. Results reported that the (CHSS/M) mushroom significantly (P < 0.05) reduced polyphenol oxidase activity (24.31 U mg−1 Protein) compared with (Control/M) mushrooms that increased faster than the treated samples. (CHSSN/M) treatment was the most efficient in the reduction of yeast and mold, aerobic plate microorganisms (5.27–5.10 log CFU/g), respectively. The results established that nano-coating film might delay the aging degree and accompany by marked prolongation of postharvest mushroom freshness.

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Investigating the Nano-Films Effect on Physical, Mechanical Properties, Chemical Changes, and Microbial Load Contamination of White Button Mushrooms during Storage

Coatings ◽

10.3390/coatings11010044 ◽

2021 ◽

Vol 11 (1) ◽

pp. 44

Author(s):

Sami Rokayya ◽

Ebtihal Khojah ◽

Abeer Elhakem ◽

Nada Benajiba ◽

Murthy Chavali ◽

...

Keyword(s):

Mechanical Properties ◽

Weight Loss ◽

Storage Period ◽

Microbial Load ◽

Nano Silica ◽

Chemical Changes ◽

Preservation Method ◽

Nano Coating ◽

Button Mushrooms ◽

White Button Mushrooms

Nutrient-rich edible white button mushrooms were coated with Chitosan (1%), Chitosan/nano-silica, and Chitosan/nano-titanium and then stored at 4 °C toinvestigate the physical, mechanical properties, chemical changes, and microbial load contamination at an interval of 3 days up to a 12 day storage period. It was noticed that Chitosan/nano-titanium and Chitosan/nano-silica preserved the weight loss percentages as 11.80% and 12.69%, respectively. Treatment with Chitosan/nano-silica coating was found to havepositive impacts on the overall color parameters. Both of the nano-coating films enhanced headspace gas compositions and firmness. Chitosan/nano-silica samples recorded the least electrolyte leakage value (24.44%), as low oxygen gas concentration can reduce the respiration rate, weight loss, and cap opening. Chitosan/nano-titanium treatment showed the lowest cap opening value (19.58%), PPO activity (16.98 mg−1 protein), and microbial load contamination (6.12 log CFU/g) at the end of the whole storage period, suggesting that nano-films are a promising preservation method forprolonging the white button mushroom’s shelf-life.

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The influence of some physicochemical parameters on the microbial growth in soils

Thermochimica Acta ◽

10.1016/s0040-6031(02)00245-9 ◽

2002 ◽

Vol 394 (1-2) ◽

pp. 123-131 ◽

Cited By ~ 21

Author(s):

Lisardo Núñez-Regueira ◽

O Núñez-Fernández ◽

J.A Rodrı́guez Añón ◽

J Proupı́n Castiñeiras

Keyword(s):

Physicochemical Parameters ◽

Microbial Growth

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Effects of Replacing Extruded Maize by Dried Citrus Pulp in a Mixed Diet on Ruminal Fermentation, Methane Production, and Microbial Populations in Rusitec Fermenters

Animals ◽

10.3390/ani10081316 ◽

2020 ◽

Vol 10 (8) ◽

pp. 1316

Author(s):

Jairo García-Rodríguez ◽

Cristina Saro ◽

Iván Mateos ◽

Jesús S. González ◽

María Dolores Carro ◽

...

Keyword(s):

Methane Production ◽

Microbial Growth ◽

Microbial Populations ◽

Mixed Diet ◽

Ruminal Fermentation ◽

Citrus Industry ◽

Ph Values ◽

Citrus Pulp ◽

Liquid Phases ◽

Fermentation Parameters

Citrus pulp is a highly abundant by-product of the citrus industry. The aim of this study was to assess the effects of replacing extruded maize (EM; 20% of total diet) by dried citrus pulp (DCP; 20%) in a mixed diet on rumen fermentation and microbial populations in Rusitec fermenters. The two diets contained 50% alfalfa hay and 50% concentrate, and the same protein level. Four Rusitec fermenters were used in a cross-over design with two 13-d incubation runs. After 7-d of diet adaptation, diet disappearance, fermentation parameters, microbial growth, and microbial populations were assessed. Fermenters receiving the DCP showed greater pH values and fiber disappearance (p < 0.001) and lower methane production (p = 0.03) than those fed EM. Replacing EM by DCP caused an increase in the proportions of propionate and butyrate (p < 0.001) and a decrease in acetate (p = 0.04). Microbial growth, bacterial diversity, and the quantity of bacteria and protozoa DNA were not affected by the diet, but the relative abundances of fungi and archaea were greater (p < 0.03) in solid and liquid phases of DCP fermenters, respectively. Results indicate that DCP can substitute EM, promoting a more efficient ruminal fermentation.

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Sodium reduction strategies through use of meat extenders (white button mushrooms vs. textured soy) in beef patties

Food Science & Nutrition ◽

10.1002/fsn3.824 ◽

2019 ◽

Vol 7 (2) ◽

pp. 506-518 ◽

Cited By ~ 6

Author(s):

Kristin M. Wong ◽

Maria G. Corradini ◽

Wesley Autio ◽

Amanda J. Kinchla

Keyword(s):

Sodium Reduction ◽

Beef Patties ◽

Reduction Strategies ◽

Button Mushrooms ◽

White Button Mushrooms

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Succession of microbial populations and nitrogen-fixation associated with the biodegradation of sediment-oil-agglomerates buried in a Florida sandy beach

Scientific Reports ◽

10.1038/s41598-019-55625-6 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 3

Author(s):

Boryoung Shin ◽

Ioana Bociu ◽

Max Kolton ◽

Markus Huettel ◽

Joel E. Kostka

Keyword(s):

Nitrogen Fixation ◽

Petroleum Hydrocarbons ◽

Microbial Growth ◽

Sandy Beach ◽

Sandy Beaches ◽

Beach Sand ◽

Microbial Populations ◽

In Situ Experiment ◽

Potential Threat ◽

Nitrogenase Genes

AbstractThe Deepwater Horizon (DWH) oil spill contaminated coastlines from Louisiana to Florida, burying oil up to 70 cm depth in sandy beaches, posing a potential threat to environmental and human health. The dry and nutrient-poor beach sand presents a taxing environment for microbial growth, raising the question how the biodegradation of the buried oil would proceed. Here we report the results of an in-situ experiment that (i) characterized the dominant microbial communities contained in sediment oil agglomerates (SOAs) of DWH oil buried in a North Florida sandy beach, (ii) elucidated the long-term succession of the microbial populations that developed in the SOAs, and (iii) revealed the coupling of SOA degradation to nitrogen fixation. Orders of magnitude higher bacterial abundances in SOAs compared to surrounding sands distinguished SOAs as hotspots of microbial growth. Blooms of bacterial taxa with a demonstrated potential for hydrocarbon degradation (Gammaproteobacteria, Alphaproteobacteria, Actinobacteria) developed in the SOAs, initiating a succession of microbial populations that mirrored the evolution of the petroleum hydrocarbons. Growth of nitrogen-fixing prokaryotes or diazotrophs (Rhizobiales and Frankiales), reflected in increased abundances of nitrogenase genes (nifH), catalyzed biodegradation of the nitrogen-poor petroleum hydrocarbons, emphasizing nitrogen fixation as a central mechanism facilitating the recovery of sandy beaches after oil contamination.

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PREDOMINANT MICROORGANISMS ON RAW PLANT FOODS1,2

Journal of Milk and Food Technology ◽

10.4315/0022-2747-33.11.500 ◽

1970 ◽

Vol 33 (11) ◽

pp. 500-505 ◽

Cited By ~ 13

Author(s):

D. F. Splittstoesser

Keyword(s):

Microbial Growth ◽

Microbial Populations ◽

Green Beans ◽

Plant Foods ◽

Microbial Counts ◽

Equipment Contamination ◽

Growth History

Considerable variation was observed in the microbial populations present on raw plant foods. Equipment contamination and microbial growth on the product following harvest often were responsible for high microbial counts. Because of these factors, vegetables protected by a pod or husk frequently were more heavily contaminated than those exposed to soil and air throughout their growth history. Similar types of microorganisms were isolated from raw and post-blanch samples of peas and green beans. The samples recontaminated after the blanch generally contained a higher proportion of catalase-negative cocci. Some of the properties of the more numerous groups are presented. Many of the isolates were sufficiently different from “type” cultures that they could not be readily placed into described species.

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