Perimetric Distributed UV Reactor and Its Validation and the Decontamination of Fresh Broccolis

Oliveira, Bruno L.; Pérez, Shirly Lara; Chianfrone, Daniel José; Blanco, Kate Cristina; Bagnato, Vanderlei Salvador

doi:10.11648/j.ajac.20190706.12

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…This absorbed radiation results in an excited state; in other words, the energy that remains in the ground state becomes excited to a singlet state. To achieve equilibrium, the system decays, emitting waves of lower energy that are acquired by the photodiode detector in device 10 .…”

Section: Resultsmentioning

confidence: 99%

Brewed coffee sensorial classification with fluorescence spectroscopy by chemometric analysis

Oliveira,

Yasuoka,

Neto

2024

Photonic Instrumentation Engineering XI

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The analysis of the quality and selection of green coffee beans is currently performed using sensory methods, following the SCAA cupping protocol, which yields qualitative results. Evaluators assess 11 different sensory attributes of the coffee, using a 300 g sample roasted lightly for 10-15 minutes over a direct flame. The roasted sample is then ground and divided equally into 5 pots, infused with water, and allowed to rest for 5 minutes. Following this resting period, sensory analysis is conducted, with scores assigned to each attribute on a scale of 0 -10. This procedure is carried out independently and in triplicated. In the day-to-day operations of a coffee roasting plant, it is important to maintain control over each batch of raw coffee and ensure that the roasting process is followed accurately. Currently, this evaluation process requires a complex and comprehensive infrastructure. However, advancements in optical and computational capabilities have opened new possibilities. Consequently, this research aims to explore the application of fluorescence spectroscopy on raw coffee samples and utilize chemometric techniques to separate and classify the beverage profiles.

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Section: Resultsmentioning

confidence: 99%

Brewed coffee sensorial classification with fluorescence spectroscopy by chemometric analysis

Oliveira,

Yasuoka,

Neto

2024

Photonic Instrumentation Engineering XI

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Enhanced vegetable production in hydroponic systems using decontamination of closed circulating fluid

Perez,

Ferro,

Corrêa

et al. 2024

Sci Rep

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While plant microorganisms can promote plants by producing natural antibiotics, they can also be vectors for disease transmission. Contamination from plant management practices and the surrounding environment can adversely affect plants, leading to infections and hindered growth due to microbial competition for nutrients. The recirculation of nutrient-rich fluids can facilitate the transport of microorganisms between vegetables in the hydroponic production system. This issue can be addressed through the application of the decontamination method in the hydroponic liquid. Ultraviolet light (UV-C) has been employed for microbiology, and its effects on lettuce were evaluated in this study. This study aims to assess the effectiveness of a decontamination system using UV-C in hydroponic solutions during nutrient recirculation in hydroponics. We evaluated the time required for lettuce plants to reach their maximum height, as well as their pigment content, phenolic compounds, antioxidant capacity, and micro and macronutrient levels. The evaluation was conducted under two photoperiods (18 and 20 hours) in lettuce samples exposed to UV-C in the hydroponic fluid, with control groups not exposed to UV-C. The application of the UV-C decontamination system in hydroponic circulation water containing nutrients accelerated plant growth while maintaining nutritional values equal to or higher than those in the control groups without such a system. The results of microorganism control highlight the potential application of this technique for enhancing and expediting vegetable production. This approach reduces production time and enhances nutrient absorption and the content of certain compounds and minerals.

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Assembly of UV-Ozone Reactor to Combat of Coronavirus and Other Pathogenic Microorganisms

Santos

Vendrami²,

Duarte

et al. 2021

RBAV

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The contamination on the surface of objects caused by: fungi, microbes, bacteria and viruses (and also coronavirus) can be solved using UV rays and/or ozone gas. For this reason, a UV-Ozone reactor apparatus with low cost was mounted to test two different types of HID (high intensity discharge) lamps: high pressure mercury vapor lamp (HPMVL) and metal halide lamp (MHL), both with nominal power of 400 watts and E-40 (base, screw) were studied as possible method of disinfection. Each lamp used the respective electromagnetic ballasts and both were manufactured by Osram Company. These lamps have two bulb types: the outer bulb which was removed and it is responsible for filtering the ultraviolet wavelengths and the internal bulb (where there is mercury, argon or metal halide confined at high pressure) that is the main source of ultraviolet rays. The complete apparatus was assembled using: aluminum reflector (used as a chamber), two microcomputer fans and a wooden base covered by an aluminum foil. A rubber strip was placed at the edge of the reflector for better adhesion on the aluminum foil (for better confinement ozone gas). The ozone concentration inside the reactor was measured with a monitor, the temperatures were measured near lamps with a thermocouple and a spectroradiometer with optical fiber was used to obtain the wavelengths. The results revealed to the elapsed time of 2 minutes a maximum peak of ozone concentration of 23 ppm for LVMAP, while the MHL presented 4.5 ppm only. The temperature obtained by HPMVL was lower with 31.5 ºC, while the MHL presented 48.0 ºC. The HPMVL presented higher amount of wavelengths at the ranges: UV-A, UV-B and UV-C, while the MHL presented only UV-A. For these reasons, it is suggested to be most promissory the use of HPMVL to combat the coronavirus and other pathogenic microorganisms.

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Perimetric Distributed UV Reactor and Its Validation and the Decontamination of Fresh Broccolis

Cited by 3 publications

References 19 publications

Brewed coffee sensorial classification with fluorescence spectroscopy by chemometric analysis

Brewed coffee sensorial classification with fluorescence spectroscopy by chemometric analysis

Enhanced vegetable production in hydroponic systems using decontamination of closed circulating fluid

Assembly of UV-Ozone Reactor to Combat of Coronavirus and Other Pathogenic Microorganisms

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