Ultraviolet Light-Assisted Photocatalytic Disinfection of Escherichia coli and Its Effects on the Quality Attributes of White Grape Juice

Ramesh, Tamanna; Yaparatne, Sudheera; Tripp, Carl P.; Nayak, Balunkeswar; Amirbahman, Aria

doi:10.1007/s11947-018-2182-6

Cited by 13 publications

(7 citation statements)

References 56 publications

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“…The non-significant effects of UVC-LEDs at 275 nm in batches on TSS and TA were also demonstrated in apple juice (Xiang et al., 2020). These are also similar to those of previous studies on white grape juice and apple juice which were treated by UVC at 254 nm in batches (Gayan et al., 2013; Ramesh et al., 2018; Unluturk and Atilgan, 2015).…”

Section: Resultssupporting

confidence: 90%

“…There were no significant changes in pH values for any given treatment compared to the untreated sample. Several studies have shown no effect on pH of juices following UVC treatment (Mohd-Hanif et al., 2016; Ramesh et al., 2018).…”

Section: Resultsmentioning

confidence: 99%

“…Total phenolics were measured with Folin–Ciocalteu method with some modifications (Ramesh et al., 2018; Xiang et al., 2019). Briefly, each sample (0.5 mL) was added to tubes containing 1.0 mL of Folin–Ciocalteu’s reagent with serial dilution and incubated for 10 min.…”

Section: Methodsmentioning

confidence: 99%

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Effects of ultraviolet-C light-emitting diodes at 275 nm on inactivation of Alicyclobacillusacidoterrestris vegetative cells and its spores as well as the quality attributes of orange juice

Zhai

Tian

Ping

et al. 2020

Food sci. technol. int.

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Alicyclobacillus acidoterrestris is a thermoacidophilic, spore-forming bacillus. A. acidoterrestris and its spores can survive in pasteurized juices and cause microbial spoilage. In this work, the effects of ultraviolet-C light-emitting diodes at 275 nm on the inactivation of A. acidoterrestris vegetative cells and its spores in commercial pasteurized orange juice were studied. Meanwhile, the effects of ultraviolet-C light-emitting diodes on the quality attributes of the orange juice were also investigated. The quantities of A. acidoterrestris vegetative cells and its spores inoculated in orange juice were reduced by 6.04 and 2.49 log10 CFU/mL after ultraviolet-C light-emitting diode treatment at 220 mJ/cm2, respectively. The Weibull and Weibull plus tail models were satisfactorily fitted to estimate the reductions of A. acidoterrestris vegetative cells and its spores in orange juice, respectively. Physicochemical properties (pH, titratable acidity, total soluble solids, and clarity) of orange juice did not change significantly after exposure to ultraviolet-C light-emitting diodes. However, the total phenolic content of orange juice decreased with increasing fluence. In addition, ultraviolet-C light-emitting diode treatment at a higher fluence led to a noticeable color difference. These results indicate that ultraviolet-C light-emitting diode treatment has a potential application in the juice processing industry.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

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Effects of ultraviolet-C light-emitting diodes at 275 nm on inactivation of Alicyclobacillusacidoterrestris vegetative cells and its spores as well as the quality attributes of orange juice

Zhai

Tian

Ping

et al. 2020

Food sci. technol. int.

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“…UV-A is less bactericidal than UV-C [4,22]. However, a bactericidal effect has been reported for UV-A at sufficient dosage [23,24] under laboratory conditions. Further investigation of the potential UV-A treatment of airborne pathogens is warranted, especially for indoor barn applications.…”

Section: Normalization Of the Datamentioning

confidence: 97%

Mitigation of Particulate Matter and Airborne Pathogens in Swine Barn Emissions with Filtration and UV-A Photocatalysis

Lee¹,

Kozieł²,

Macedo³

et al. 2021

Preprint

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This study evaluated the use of filtration and UV-A photocatalysis for the reduction of particulate matter (PM) and airborne bacterial pathogens in swine barns. Two MERV filters (8 and 15) were used to mitigate PM concentrations measured at the PM 1, PM 2.5, respirable PM, and PM 10 ranges. Filtration was also used to generate different levels of airborne pathogens to be treated by UV-A. Results show that MERV 8 and 15 filters effectively reduced PM concentrations (96-98%) in air exhausted from a swine barn (p ranged from < 0.01 to 0.04). UV-A photocatalysis did not mitigate PM concentrations. UV-A photocatalysis treatment reduced measured colony-forming units (CFUs) by 15-95%. The CFU percent reduction was higher when airborne PM concentration was low. The numeric results suggested a real mitigation effect despite p-values that did not meet the usual statistical cut-off of <0.05 for significance due to the large variability of the CFU control samples. Normalization of measured airborne pathogen concentrations by smaller PM size range concentrations led to emerging significant treatment differences for CFUs. A significant decrease (~60% reduction; p < 0.03) in the concentration of viable airborne bacteria was shown for all PM below the 10-micron range.

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“…However, by increasing the number of tested UV-C lamps, the inactivation efficacy was enhanced (>5 log CFU/ml) because the UV-C intensity was doubled [ 36 ]. The results summarized in Table 1 also show that an increase in the irradiation time would increase the UV-C dose/intensity, allowing greater reductions in the target microorganisms in fruit juice samples [ 19 , 25 , 26 , 28 , 33 , 37 - 40 ]. However, in some cases, further irradiation up to certain exposure times did not cause any significant increase in the microbial reduction [ 24 , 32 ].…”

Section: Efficacy Of Uv-c Varies Depending On Uv-c Decontamination Pr...mentioning

confidence: 99%

A Review of the Efficacy of Ultraviolet C Irradiation for Decontamination of Pathogenic and Spoilage Microorganisms in Fruit Juices

Mansur

Lee

2023

J. Microbiol. Biotechnol.

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Ultraviolet C (UV-C, 200–280 nm) light has germicidal properties that inactivate a wide range of pathogenic and spoilage microorganisms. UV-C has been extensively studied as an alternative to thermal decontamination of fruit juices. Recent studies suggest that the efficacy of UV-C irradiation in reducing microorganisms in fruit juices is greatly dependent on the characteristics of the target microorganisms, juice matrices, and parameters of the UV-C treatment procedure, such as equipment and processing. Based on evidence from recent studies, this review describes how the characteristics of target microorganisms ( e.g. , type of microorganism/strain, acid adaptation, physiological states, single/composite inoculum, spore, etc.) and fruit juice matrices ( e.g. , UV absorbance, UV transmittance, turbidity, soluble solid content, pH, color, etc.) affect the efficacy of UV-C. We also discuss the influences on UV-C treatment efficacy of parameters, including UV-C light source, reactor conditions ( e.g. , continuous/batch, size, thickness, volume, diameter, outer case, configuration/arrangement), pumping/flow system conditions ( e.g. , sample flow rate and pattern, sample residence time, number of cycles), homogenization conditions ( e.g. , continuous flow/recirculation, stirring, mixing), and cleaning capability of the reactor. The collective facts indicate the immense potential of UV-C irradiation in the fruit juice industry. Existing drawbacks need to be addressed in future studies before the technique is applicable at the industrial scale.

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Ultraviolet Light-Assisted Photocatalytic Disinfection of Escherichia coli and Its Effects on the Quality Attributes of White Grape Juice

Cited by 13 publications

References 56 publications

Effects of ultraviolet-C light-emitting diodes at 275 nm on inactivation of Alicyclobacillusacidoterrestris vegetative cells and its spores as well as the quality attributes of orange juice

Effects of ultraviolet-C light-emitting diodes at 275 nm on inactivation of Alicyclobacillusacidoterrestris vegetative cells and its spores as well as the quality attributes of orange juice

Mitigation of Particulate Matter and Airborne Pathogens in Swine Barn Emissions with Filtration and UV-A Photocatalysis

A Review of the Efficacy of Ultraviolet C Irradiation for Decontamination of Pathogenic and Spoilage Microorganisms in Fruit Juices

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