Effect of ultraviolet-C light and mild thermal treatment on the storage life of orange juice

This study aimed to evaluate the effect of low-dosage treatment with ultraviolet-C light (19.75 J L<sup>–1</sup> for 5 min), mild thermal treatment (40 °C for 5 min), or their combination on the native microflora (mesophiles and moulds plus yeast) and consumer acceptance of orange juice at the beginning and after storage (5 or 22 °C). Results indicated that UV-C light and mild thermal treatments reduce 0.19 ± 0.03 and 0.25 ± 0.02 log cycles (both kinds of microorganisms), respectively. The combination of treatments displays an additive effect against mesophiles (0.47 ± 0.01 log) and moulds plus yeasts (0.42 ± 0.02 log). After 9 days of storage at 5 °C, combined treatment did not present any microbial increases (P > 0.05), while consumer acceptance was similar (P > 0.05) to the fresh orange juice. Although several studies about the use of hurdle technology using UV-C light in orange juice have to be conducted, the results obtained in this study are promising, and they can be used for further studies.

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Bacterial Spore Inactivation in Orange Juice and Orange Peel by Ultraviolet-C Light

Foods ◽

10.3390/foods10040855 ◽

2021 ◽

Vol 10 (4) ◽

pp. 855

Author(s):

Pilar Colás-Medà ◽

Iolanda Nicolau-Lapeña ◽

Inmaculada Viñas ◽

Isma Neggazi ◽

Isabel Alegre

Keyword(s):

Orange Juice ◽

Fruit Juice ◽

Microbiological Quality ◽

Orange Peel ◽

Bacillus Coagulans ◽

Fruit Juices ◽

Bacterial Spores ◽

Quality And Safety ◽

Ultraviolet C ◽

Uv C

Spore-forming bacteria are a great concern for fruit juice processors as they can resist the thermal pasteurization and the high hydrostatic pressure treatments that fruit juices receive during their processing, thus reducing their microbiological quality and safety. In this context, our objective was to evaluate the efficacy of Ultraviolet-C (UV-C) light at 254 nm on reducing bacterial spores of Alicyclobacillus acidoterrestris, Bacillus coagulans and Bacillus cereus at two stages of orange juice production. To simulate fruit disinfection before processing, the orange peel was artificially inoculated with each of the bacterial spores and submitted to UV-C light (97.8–100.1 W/m2) with treatment times between 3 s and 10 min. The obtained product, the orange juice, was also tested by exposing the artificially inoculated juice to UV-C light (100.9–107.9 W/m2) between 5 and 60 min. A three-minute treatment (18.0 kJ/m2) reduced spore numbers on orange peel around 2 log units, while more than 45 min (278.8 kJ/m2) were needed to achieve the same reduction in orange juice for all evaluated bacterial spores. As raw fruits are the main source of bacterial spores in fruit juices, reducing bacterial spores on fruit peels could help fruit juice processors to enhance the microbiological quality and safety of fruit juices.

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Effect of Combined Treatment of Ultraviolet-C with Aqueous Chlorine Dioxide or Fumaric Acid on the Postharvest Quality of Strawberry Fruit "Flamengo" during Storage

Journal of the Korean Society of Food Science and Nutrition ◽

10.3746/jkfn.2010.39.1.138 ◽

2010 ◽

Vol 39 (1) ◽

pp. 138-145 ◽

Cited By ~ 21

Author(s):

Ju-Yeon Kim ◽

Hyun-Jin Kim ◽

Geum-Ok Lim ◽

Sung-Ae Jang ◽

Kyung-Bin Song

Keyword(s):

Chlorine Dioxide ◽

Fumaric Acid ◽

Combined Treatment ◽

Postharvest Quality ◽

Strawberry Fruit ◽

Ultraviolet C

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A multilevel investigation supported by multivariate analysis for tomato product formulation

European Food Research and Technology ◽

10.1007/s00217-021-03794-y ◽

2021 ◽

Author(s):

Fatma Boukid ◽

Elena Curti ◽

Agoura Diantom ◽

Eleonora Carini ◽

Elena Vittadini

Keyword(s):

Thermal Treatment ◽

Color Change ◽

Water Molecules ◽

Thermal Treatments ◽

Industrial Processing ◽

H Nmr ◽

Mobile Populations ◽

Product Formulation ◽

Tomato Product ◽

The Impact

AbstractIndustrial processing of tomato includes its cutting and mincing, thermal treatments, and the addition of ingredients, which might induce changes in physicochemical properties of the final products. In this frame, the impact of texturing/thickening [xanthan gum (X) or potato fiber (F)] on the macroscopic, mesoscopic and molecular properties of tomato double concentrate (TDC) was investigated to determine if F can efficiently substitute X, in association with small solutes (sugar and salt) and thermal treatment (cold and hot). At a macroscopic level, multivariate statistics (MANOVA) underlined that color change (ΔE) was increased by X and F addition contrary to heating and the addition of salt and sugar. MANOVA revealed that texture was greatly enhanced through the use of F over X. 1H NMR molecular mobility changes were more controlled by texturing agents (F and X) than thermal treatment and small solutes. Particularly F increased the more rigid population indicating stronger interaction with water molecules resulting in shear-thinning flow. However, adding X contributed into the increase of the dynamic and mobile populations. Therefore, F can be a valid “clean label” substitute of X in modulating tomato products properties.

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Effectiveness of Ultraviolet-C Room Disinfection on Preventing Healthcare-Associated Clostridioides difficile Infection

Infection Control and Hospital Epidemiology ◽

10.1017/ice.2020.512 ◽

2020 ◽

Vol 41 (S1) ◽

pp. s33-s33

Author(s):

Michihiko Goto ◽

Erin Balkenende ◽

Gosia Clore ◽

Rajeshwari Nair ◽

Loretta Simbartl ◽

...

Keyword(s):

Acute Care ◽

Acute Care Hospitals ◽

Incidence Rates ◽

Positive Test ◽

Negative Binomial Regression Model ◽

Test Results ◽

Clostridioides Difficile ◽

Ultraviolet C ◽

Healthcare Associated ◽

Uv C

Background: Enhanced terminal room cleaning with ultraviolet C (UVC) disinfection has become more commonly used as a strategy to reduce the transmission of important nosocomial pathogens, including Clostridioides difficile, but the real-world effectiveness remains unclear. Objectives: We aimed to assess the association of UVC disinfection during terminal cleaning with the incidence of healthcare-associated C. difficile infection and positive test results for C. difficile within the nationwide Veterans Health Administration (VHA) System. Methods: Using a nationwide survey of VHA system acute-care hospitals, information on UV-C system utilization and date of implementation was obtained. Hospital-level incidence rates of clinically confirmed hospital-onset C. difficile infection (HO-CDI) and positive test results with recent healthcare exposures (both hospital-onset [HO-LabID] and community-onset healthcare-associated [CO-HA-LabID]) at acute-care units between January 2010 and December 2018 were obtained through routine surveillance with bed days of care (BDOC) as the denominator. We analyzed the association of UVC disinfection with incidence rates of HO-CDI, HO-Lab-ID, and CO-HA-LabID using a nonrandomized, stepped-wedge design, using negative binomial regression model with hospital-specific random intercept, the presence or absence of UVC disinfection use for each month, with baseline trend and seasonality as explanatory variables. Results: Among 143 VHA acute-care hospitals, 129 hospitals (90.2%) responded to the survey and were included in the analysis. UVC use was reported from 42 hospitals with various implementation start dates (range, June 2010 through June 2017). We identified 23,021 positive C. difficile test results (HO-Lab ID: 5,014) with 16,213 HO-CDI and 24,083,252 BDOC from the 129 hospitals during the study period. There were declining baseline trends nationwide (mean, −0.6% per month) for HO-CDI. The use of UV-C had no statistically significant association with incidence rates of HO-CDI (incidence rate ratio [IRR], 1.032; 95% CI, 0.963–1.106; P = .65) or incidence rates of healthcare-associated positive C. difficile test results (HO-Lab). Conclusions: In this large quasi-experimental analysis within the VHA System, the enhanced terminal room cleaning with UVC disinfection was not associated with the change in incidence rates of clinically confirmed hospital-onset CDI or positive test results with recent healthcare exposure. Further research is needed to understand reasons for lack of effectiveness, such as understanding barriers to utilization.Funding: NoneDisclosures: None

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High Pressure Processing Impact on Alternariol and Aflatoxins of Grape Juice and Fruit Juice-Milk Based Beverages

Molecules ◽

10.3390/molecules26123769 ◽

2021 ◽

Vol 26 (12) ◽

pp. 3769

Author(s):

Noelia Pallarés ◽

Albert Sebastià ◽

Vicente Martínez-Lucas ◽

Mario González-Angulo ◽

Francisco J. Barba ◽

...

Keyword(s):

High Pressure ◽

Thermal Treatment ◽

Orange Juice ◽

Grape Juice ◽

Good Alternative ◽

High Pressure Processing ◽

Life Extension ◽

Food Contaminants ◽

Dispersive Liquid Liquid Microextraction ◽

Strawberry Juice

High-pressure processing (HPP) has emerged over the last 2 decades as a good alternative to traditional thermal treatment for food safety and shelf-life extension, supplying foods with similar characteristics to those of fresh products. Currently, HPP has also been proposed as a useful tool to reduce food contaminants, such as pesticides and mycotoxins. The aim of the present study is to explore the effect of HPP technology at 600 MPa during 5 min at room temperature on alternariol (AOH) and aflatoxin B1 (AFB1) mycotoxins reduction in different juice models. The effect of HPP has also been compared with a thermal treatment performed at 90 °C during 21 s. For this, different juice models, orange juice/milk beverage, strawberry juice/milk beverage and grape juice, were prepared and spiked individually with AOH and AFB1 at a concentration of 100 µg/L. After HPP and thermal treatments, mycotoxins were extracted from treated samples and controls by dispersive liquid–liquid microextraction (DLLME) and determined by HPLC-MS/MS-IT. The results obtained revealed reduction percentages up to 24% for AFB1 and 37% for AOH. Comparing between different juice models, significant differences were observed for AFB1 residues in orange juice/milk versus strawberry juice/milk beverages after HPP treatment. Moreover, HPP resulted as more effective than thermal treatment, being an effective tool to incorporate to food industry in order to reach mycotoxins reductions.

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Ultraviolet-C as a Viable Reprocessing Method for Disposable Masks and Filtering Facepiece Respirators

Polymers ◽

10.3390/polym13050801 ◽

2021 ◽

Vol 13 (5) ◽

pp. 801

Author(s):

Talita Nicolau ◽

Núbio Gomes Filho ◽

Andrea Zille

Keyword(s):

Literature Review ◽

Systematic Literature Review ◽

Personal Protective Equipment ◽

State Of The Art ◽

Protective Equipment ◽

Multiple Methods ◽

Ultraviolet C ◽

Single Use ◽

Uv C ◽

New Strategies

In normal conditions, discarding single-use personal protective equipment after use is the rule for its users due to the possibility of being infected, particularly for masks and filtering facepiece respirators. When the demand for these protective tools is not satisfied by the companies supplying them, a scenario of shortages occurs, and new strategies must arise. One possible approach regards the disinfection of these pieces of equipment, but there are multiple methods. Analyzing these methods, Ultraviolet-C (UV-C) becomes an exciting option, given its germicidal capability. This paper aims to describe the state-of-the-art for UV-C sterilization in masks and filtering facepiece respirators. To achieve this goal, we adopted a systematic literature review in multiple databases added to a snowball method to make our sample as robust as possible and encompass a more significant number of studies. We found that UV-C’s germicidal capability is just as good as other sterilization methods. Combining this characteristic with other advantages makes UV-C sterilization desirable compared to other methods, despite its possible disadvantages.

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Modelling inactivation of wild‐type and clinical Escherichia coli O26 strains using UV‐C and thermal treatment and subsequent persistence in simulated gastric fluid

Journal of Applied Microbiology ◽

10.1111/jam.14397 ◽

2019 ◽

Vol 127 (5) ◽

pp. 1564-1575 ◽

Cited By ~ 5

Author(s):

V.S. Castro ◽

D.K.A. Rosario ◽

Y.S. Mutz ◽

A.C.C. Paletta ◽

E.E.S. Figueiredo ◽

...

Keyword(s):

Escherichia Coli ◽

Thermal Treatment ◽

Gastric Fluid ◽

Simulated Gastric Fluid ◽

Wild Type ◽

Uv C

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Inactivation of Candida auris and Candida albicans by Ultraviolet-C

Infection Control and Hospital Epidemiology ◽

10.1017/ice.2020.868 ◽

2020 ◽

Vol 41 (S1) ◽

pp. s292-s292

Author(s):

William Rutala ◽

Hajime Kanamori ◽

Maria Gergen ◽

Emily Sickbert-Bennett ◽

David Jay Weber

Keyword(s):

Infection Prevention ◽

Antifungal Drugs ◽

Candida Auris ◽

Healthcare Facilities ◽

Environmental Surfaces ◽

Route Of Transmission ◽

Indirect Exposure ◽

Ultraviolet C ◽

Severe Infections ◽

Uv C

Background:Candida auris is an emerging fungal pathogen that is often resistant to major classes of antifungal drugs. It is considered a serious global health threat because it has caused severe infections with frequent mortality in over a dozen countries. C. auris can survive on healthcare environmental surfaces for at least 7 days, and it causes outbreaks in healthcare facilities. C. auris has an environmental route of transmission. Thus, infection prevention strategies, such as surface disinfection and room decontamination technologies (eg, ultraviolet [UV-C] light), will be essential to controlling transmission. Unfortunately, data are limited regarding the activity of UV-C to inactivate this pathogen. In this study, a UV-C device was evaluated for its antimicrobial activity against C. auris and C. albicans. Methods: We tested the antifungal activity of a single UV-C device using the vegetative bacteria cycle, which delivers a reflected dose of 12,000 µW/cm2. This testing was performed using Formica sheets (7.6 × 7.6 cm; 3 × 3 inches). The carriers were inoculated with C. auris or C. albicans and placed horizontal on the surface or vertical (ie, perpendicular) to the vertical UV-C lamp and at a distance from 1. 2 m (~4 ft) to 2.4 m (~8 ft). Results: Direct UV-C, with or without FCS (log10 reduction 4.57 and 4.45, respectively), exhibited a higher log10 reduction than indirect UV-C for C. auris (log10 reduction 2.41 and 1.96, respectively), which was statistically significant (Fig. 1 and Table 1). For C. albicans, although direct UV-C had a higher log10 reduction (log10 reduction with and without FCS, 5.26 and 5.07, respectively) compared to indirect exposure (log10 reduction with and without FCS, 3.96 and 3.56, respectively), this difference was not statistically significant. The vertical UV had statistically higher log10 reductions than horizontal UV against C. auris and C. albicans with FCS and without FCS. For example, for C. auris with FCS the log10 reduction for vertical surfaces was 4.92 (95% CI 3.79, 6.04) and for horizontal surfaces the log10 reduction was 2.87 (95% CI, 2.36–3.38). Conclusions:C. auris can be inactivated on environmental surfaces by UV-C as long as factors that affect inactivation are optimized (eg, exposure time). These data and other published UV-C data should be used in developing cycle parameters that prevent contaminated surfaces from being a source of acquisition by staff or patients of this globally emerging pathogen.Funding: NoneDisclosures: None

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