Previous physicochemical stress exposures influence subsequent resistance of Escherichia coli O157:H7, Salmonella enterica, and Listeria monocytogenes to ultraviolet-C in coconut liquid endosperm beverage

Gabriel, Alonzo A.

doi:10.1016/j.ijfoodmicro.2015.02.003

Cited by 30 publications

(3 citation statements)

References 32 publications

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“…highest dose tested). Gabriel (2015) observed that stress induction (acid treatment followed by desiccation stress) prior to UVC treatment increased the dose required to inactivate 1 log 10 of the bacteria from 8·4 to 18·4 mJ/cm 2 for a food-borne E. coli O157 strain. Huang et al (2016) observed that among a small sample of E. coli isolates (n = 5) collected from secondary treated waste water, considerable and variable resistance to lowpressure UV was observed, with doses as high as 40 mJ/cm 2 , leading to E. coli inactivation levels between 2·9 log 10 and 5·7 log 10 among these isolates.…”

Section: Discussionmentioning

confidence: 99%

Stress resistance in naturalised waste water E. coli strains

Zhi

BantingGraham

RueckerNorma³

et al. 2017

Journal of Environmental Engineering and Science

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The authors recently demonstrated that naturalised strains of Escherichia coli exist in municipal waste water, characterised by (a) biomarker patterns in intergenic regions distinct from human and animal E. coli strains and (b) an insertion element (IS30) located in the uspC-flhDC intergenic region of the genome. Remarkably, these strains are naturally adapted to survival and growth in waste water and differentially survive the treatment process. The authors sought to explore the adaptive mechanisms used by these strains for survival. A serial stress experiment (nutrient deprivation and osmotic stress followed by chlorine treatment) was performed and survival was measured using culture. Waste water strains were shown to be approximately 100 times more resistant to chlorine treatment than a wild-type human faecal strain. Naturalised waste water strains were also more robust at producing biofilmsan adaptive strategy for surviving environmental stressors. Since biofilm formation has been linked to increased motility, the authors examined the expression of the flagellar regulator gene, flhDC, under serial stress conditions. Chlorine was a potent inducer of flhDC expression in waste water strains. The results demonstrate that waste water strains possess adaptive genotypic/phenotypic properties related to their survival in waste water and challenge the understanding of treatment reduction based on E. coli as an indicator of treatment performance.

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Section: Discussionmentioning

confidence: 99%

Stress resistance in naturalised waste water E. coli strains

Zhi

BantingGraham

RueckerNorma³

et al. 2017

Journal of Environmental Engineering and Science

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“…Technological advancements have resulted in the development of UV-C irradiation devices that create a turbulent flow which allows for effective irradiation of opaque fluids of high viscosity. These UV devices have been widely used in the food industry for the treatment of complex opaque liquids or other substances including juices [49][50][51][52][53], tea [54], milk [55][56][57], cheese [58], wine [51], egg [59], dried seafood [60] and sliced fruits and vegetables [61][62][63][64]. UV-C irradiation technology has also been used for the inactivation of several viruses in human plasma products [65][66][67][68][69][70][71].…”

Section: Ultraviolet Light Irradiationmentioning

confidence: 99%

Biosafety steps in the manufacturing process of spray-dried plasma: a review with emphasis on the use of ultraviolet irradiation as a redundant biosafety procedure

et al. 2020

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Spray dried plasma (SDP) is a functional protein source obtained from blood of healthy animals, approved by the veterinary authorities from animals declared to be fit for slaughter for human consumption. Blood of these animals is collected at the slaughterhouse, treated with an anticoagulant, chilled and transported to industrial facilities in which blood is centrifuged to separate the red blood cells from the plasma fraction. Plasma is then concentrated, and spray dried at high temperatures (80°C throughout its substance) to convert it in a powder. Such method preserves the biological activity of its proteins, mainly albumins and globulins. SDP is mainly used in pig feed diets to significantly improve daily gain, feed intake, production efficiency, and to reduce post-weaning lag caused by the appearance of post-weaning diarrhea. Although SDP is considered a safe product and its manufacturing process consists of several biosafety steps, the security of the SDP is often questioned due to its nature as raw blood by-product, especially when emergent or re-emergent pathogens appear. This review provides an evaluation and validation of the different safety steps present in the manufacturing process of SDP, with special focus on a new redundant pathogen inactivation step, the UV-C irradiation, that may be implemented in the manufacturing process of the SDP. Overall results showed that the manufacturing process of SDP is safe and the UV-C radiation was effective in inactivating a wide range of bacteria and viruses spiked and naturally present in commercially collected liquid animal plasma and it can be implemented as a redundant biosafety step in the manufacturing process of the SDP. Background Spray-dried plasma (SDP) is a functional protein source obtained from blood of healthy animals approved to be sacrificed for human consumption after veterinary inspection. Blood of these animals is collected at the slaughterhouse, treated with an anticoagulant, chilled and transported to industrial facilities where the blood is centrifuged to separate the red blood cells (RBC) from the plasma fraction. Alternatively, the blood may be centrifuged in the abattoir and then the chilled plasma transported to the manufacturing plant. Plasma is subsequently concentrated either by membrane filtration or vacuum evaporation and spray-dried at high temperatures (80°C throughout its substance) to convert it to powder. This process preserves the biological activity of

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“…CS consist mainly cellulose, hemicellulose, lignin and moisture which are a potential source of Si-based refractory [3]. Coconut serves as a byeproduct for beverages, some medicine, cosmetics, natural fiber, fuel and also for much other commercialization [4][5][6][7][8]. Silicon carbide (SiC) is an essential ceramics material possessing a wide range of application.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Si-Based Refractory Compounds from Coconut Shell by Carbothermal Method

Adediran

Alaneme

Oladele

2019

JERA

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The synthesis of Si-based refractory compounds from coconut shells (CS) by carbothermal treatment was investigated. Coconut shells, an agro-waste was utilised in the processing of the Si-based refractory compounds in a single stage carbothermal processing route. The treatment scheduled was carried out in a conventional heat treatment furnace at a temperature window of (900-1900 °C) at 10 °C/min heating rate in a controlled atmosphere. X-ray Diffractometer (XRD) was used to analyzed and quantify the crystalline and amorphous phases in the reaction products. The results from Fourier transform infrared spectroscopy (FTIR) revealed that, the dominant functional groups present after the carbothermal treatment were mainly Si-O-Si and Si-C groups. Also, the XRD results showed that the polytypes are mainly of α-SiC type precipitating as hexagonal symmetry of 6H-SiC and 4H-SiC type. The silica polytypes amount to about 8-14 wt.% of the silica polytypes as observed for different processing temperatures adopted. However, the total yield of SiC-made up between 11 to 40 wt.% of the crystalline phases as identified by XRD from the process. It is evident that the adoption of this processing route is a viable option for the synthesis of coconut shells as potential reinforcement for composites design.

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Previous physicochemical stress exposures influence subsequent resistance of Escherichia coli O157:H7, Salmonella enterica, and Listeria monocytogenes to ultraviolet-C in coconut liquid endosperm beverage

Cited by 30 publications

References 32 publications

Stress resistance in naturalised waste water E. coli strains

Stress resistance in naturalised waste water E. coli strains

Biosafety steps in the manufacturing process of spray-dried plasma: a review with emphasis on the use of ultraviolet irradiation as a redundant biosafety procedure

Synthesis of Si-Based Refractory Compounds from Coconut Shell by Carbothermal Method

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