Waste cider yeast is a natural by-product generated through the production of fermentable beverages. In this work, the biosorption of patulin (PAT) from apple juice using waste cider yeast was investigated. The yeast cells were treated with caustic, ethanol and heats. Among the treatments, the highest PAT uptake (58.29%) was obtained with the caustic treated waste yeast. The effects of pH and initial concentration of PAT were assessed. The results showed that the adsorption percentage of PAT increased simultaneously with the increase of pH and approached equilibrium at pH 4.5. The removal In this paper, a new mechanism is proposed to describe the degradation of patulin using UV radiation from a midpressure
lamp with emission wavelengths between 250 and 740 nm. The mechanism consists of three stages:
excitation of the patulin molecule that can desorb the energy to its fundamental state or degrade to photoproducts.
It is shown that this mechanism is in line with a first-order kinetic that best describes the process.
Considering the linear spherical emission model and using the Simpson integration method, the spectral radiant
power absorbed by the whole solution is evaluated, and also its dependence on patulin concentration and the
incident spectral radiant power at different depths.
Previous works studied the degradation of patulin using UV radiation, but using exclusively the germicidal wavelength
of 254 nm. Moreover, none of them proposed a reaction mechanism, nor evaluated the spectral radiant
power absorbed by the whole solution.
First of all, the absorption spectrum of patulin was obtained. It was concluded that both the absorption by patulin
and emission from the lamp coexist in the range between 255 and 350 nm.
The kinetic constants for aqueous solutions of 500 μg/L of patulin at pH = 4 and pH = 7 and temperatures of 8,
25, 45, and 65 °C were obtained. In order to know the effect of the juice matrix on the photodegradation process,
the kinetic constants for clarified 12 °Brix apple juice containing 500 μg/L of patulin were obtained at the same pH
and temperature values.
Waste cider yeast is a natural by-product generated through the production of fermentable beverages. In this work, the biosorption of patulin (PAT) from apple juice using waste cider yeast was investigated. The yeast cells were treated with caustic, ethanol and heats. Among the treatments, the highest PAT uptake (58.29%) was obtained with the caustic treated waste yeast. The effects of pH and initial concentration of PAT were assessed. The results showed that the adsorption percentage of PAT increased simultaneously with the increase of pH and approached equilibrium at pH 4.5. The removal In this paper, a new mechanism is proposed to describe the degradation of patulin using UV radiation from a midpressurelamp with emission wavelengths between 250 and 740 nm. The mechanism consists of three stages:excitation of the patulin molecule that can desorb the energy to its fundamental state or degrade to photoproducts.It is shown that this mechanism is in line with a first-order kinetic that best describes the process.Considering the linear spherical emission model and using the Simpson integration method, the spectral radiantpower absorbed by the whole solution is evaluated, and also its dependence on patulin concentration and theincident spectral radiant power at different depths.Previous works studied the degradation of patulin using UV radiation, but using exclusively the germicidal wavelengthof 254 nm. Moreover, none of them proposed a reaction mechanism, nor evaluated the spectral radiantpower absorbed by the whole solution.First of all, the absorption spectrum of patulin was obtained. It was concluded that both the absorption by patulinand emission from the lamp coexist in the range between 255 and 350 nm.The kinetic constants for aqueous solutions of 500 μg/L of patulin at pH = 4 and pH = 7 and temperatures of 8,25, 45, and 65 °C were obtained. In order to know the effect of the juice matrix on the photodegradation process,the kinetic constants for clarified 12 °Brix apple juice containing 500 μg/L of patulin were obtained at the same pHand temperature values.
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