scholarly journals Degradation kinetics of vitamins in premixes for pig: effects of choline, high concentrations of copper and zinc, and storage time

2020 ◽  
Author(s):  
Pan Yang ◽  
Hua Kai Wang ◽  
Min Zhu ◽  
Long Xian Li ◽  
Yong Xi Ma
Keyword(s):  
Storage Time ◽  
Degradation Kinetics ◽  
Copper And Zinc ◽  
High Concentrations ◽  
And Storage ◽  
Kinetics Of

scholarly journals Photocatalytic degradation of reactive black 5 on the surface of tin oxide microrods

2018 ◽  
Vol 16 (5) ◽  
pp. 773-781 ◽  
Author(s):  
Shanza Rauf Khan ◽  
Muhammad Umar Khalid ◽  
Saba Jamil ◽  
Songnan Li ◽  
Aiman Mujahid ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Tin Oxide ◽  
Degradation Kinetics ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Reactive Black 5 ◽  
Unit Cells ◽  
High Concentrations ◽  
Co Precipitation ◽  
Kinetics Of

Abstract A simple co-precipitation technique is proposed for synthesis of tin oxide (SnO2) microrods. Stannous chloride and urea were used during synthesis. X-ray powder diffraction (XRD) analysis revealed that the annealed product consists of SnO2 microrods having tetragonal unit cells, while scanning electron microscopy (SEM) analysis revealed the rod-like morphology of a synthesized product. These synthesized microrods are used as photocatalyst for the degradation of reactive black 5 (RB5). Degradation kinetics of RB5 are monitored under daylight in different concentrations of hydrogen peroxide (H2O2) and catalyst. The percentage of RB5 conversion is also calculated at various concentrations of hydrogen peroxide and catalyst which demonstrate that RB5 shows high catalytic degradation at high concentrations of hydrogen peroxide and catalyst.

Study of kinetics of degradation of cyclohexane carboxylic acid by acclimated activated sludge

2016 ◽  
Vol 73 (10) ◽  
pp. 2552-2558 ◽  
Author(s):  
Chunhua Wang ◽  
Shuian Shi ◽  
Hongyan Chen
Keyword(s):  
Carboxylic Acid ◽  
Activated Sludge ◽  
Degradation Kinetics ◽  
Experimental Conditions ◽  
First Order Kinetics ◽  
Effects Of Ph ◽  
High Concentrations ◽  
Cyclohexane Carboxylic Acid ◽  
Kinetics Of ◽  
Acclimated Activated Sludge

Activated sludge contains complex microorganisms, which are highly effective biodegrading agents. In this study, the kinetics of biodegradation of cyclohexane carboxylic acid (CHCA) by an acclimated aerobic activated sludge were investigated. The results showed that after 180 days of acclimation, the activated sludge could steadily degrade >90% of the CHCA in 120 h. The degradation of CHCA by the acclimated activated sludge could be modeled using a first-order kinetics equation. The equations for the degradation kinetics for different initial CHCA concentrations were also obtained. The kinetics constant, kd, decreased with an increase in the CHCA concentration, indicating that, at high concentrations, CHCA had an inhibiting effect on the microorganisms in the activated sludge. The effects of pH on the degradation kinetics of CHCA were also investigated. The results showed that a pH of 10 afforded the highest degradation rate, indicating that basic conditions significantly promoted the degradation of CHCA. Moreover, it was found that the degradation efficiency for CHCA increased with an increase in temperature and concentration of dissolved oxygen under the experimental conditions.

scholarly journals Biodegradation of Allethrin by a Novel Fungus Fusarium proliferatum Strain CF2, Isolated from Contaminated Soils

2020 ◽  
Vol 8 (4) ◽  
pp. 593 ◽  
Author(s):  
Pankaj Bhatt ◽  
Wenping Zhang ◽  
Ziqiu Lin ◽  
Shimei Pang ◽  
Yaohua Huang ◽  
...  
Keyword(s):  
Microbial Degradation ◽  
Contaminated Soils ◽  
Degradation Kinetics ◽  
Fusarium Proliferatum ◽  
Minimal Salt Medium ◽  
Optimum Conditions ◽  
Uninoculated Control ◽  
High Concentrations ◽  
Continuous Use ◽  
Kinetics Of

Continuous use of allethrin has resulted in heavy environmental contamination and has raised public concern about its impact on human health, yet little is known about the kinetics and microbial degradation of this pesticide. This study reported the degradation kinetics in a novel fungal strain, Fusarium proliferatum CF2, isolated from contaminated agricultural fields. Strain CF2 utilized 50 mg·L−1 of allethrin as the sole carbon source for growth in minimal salt medium and tolerated high concentrations of allethrin of up to 1000 mg·L−1. The optimum degradation conditions for strain CF2 were determined to be a temperature of 26 °C and pH 6.0 using response surface methodology. Under optimum conditions, strain CF2 completely degraded allethrin within 144 hours. The degradation kinetics of allethrin followed first order reaction kinetics. Kinetics analysis showed that its half-life was substantially reduced by 507.1 hours, as compared to the uninoculated control. This study provides new insights into the microbial degradation of allethrin with fungal F. proliferatum CF2.

scholarly journals Thermal degradation kinetics of monomeric anthocyanins, colour changes and storage effect in elderberry juices

2015 ◽  
Vol 5 (1) ◽  
pp. 29-39 ◽  
Author(s):  
Carolina Busso Casati ◽  
Rosa Baeza ◽  
Virginia Sanchez ◽  
Alejandra Catalano ◽  
Paula López ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Degradation Kinetics ◽  
Thermal Degradation Kinetics ◽  
Storage Effect ◽  
Colour Changes ◽  
And Storage ◽  
Kinetics Of ◽  
Monomeric Anthocyanins

scholarly journals Kinetics of Lycopene Degradation in Sunflower and Grape Seed Oils

2018 ◽  
Vol 34 (5) ◽  
pp. 2229-2235 ◽  
Author(s):  
Antonio Zuorro ◽  
Roberto Lavecchia ◽  
Erenio González ◽  
Viatcheslav Kafarov
Keyword(s):  
Seed Oil ◽  
Storage Temperature ◽  
Degradation Kinetics ◽  
Grape Seed ◽  
Antioxidant Compounds ◽  
First Order Kinetics ◽  
Grape Seed Oil ◽  
The Stability ◽  
And Storage ◽  
Kinetics Of

The stability of lycopene in two vegetable oils, sunflower seed oil (SSO) and grape seed oil (GSO), was investigated by analysing the carotenoid degradation kinetics in the temperature range of 10–40°C. A tomato oleoresin containing 6% (w/w) of lycopene was used to prepare lycopene-enriched oil samples. Analysis of kinetic data showed that lycopene degradation follows first-order kinetics, with an apparent activation energy of 70.7 kJ mol–1 in SSO and 69 kJ mol–1 in GSO. The estimated half-life of lycopene was found to depend on oil type and storage temperature. At 20°C, it varied between 59 and 122 days, while at 4°C it was comprised between 302 and 650 days. At all temperatures, lycopene was more stable in SSO than in GSO, which is likely due to the higher content of antioxidant compounds in SSO.

scholarly journals Degradation Kinetics of Betacyanins during the Pasteurization and Storage of Cactus Pear (Opuntia dillenii Haw.) Juice Using the Arrhenius, Eyring, and Ball Models

Beverages ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 2
Author(s):  
Joseph Bassama ◽  
Abdoulaye Tamba ◽  
Moussa Ndong ◽  
Khakhila Dieu Donnée Sarr ◽  
Mady Cissé
Keyword(s):  
Degradation Kinetics ◽  
The Other ◽  
Cactus Pear ◽  
Maximum Loss ◽  
Estimated Parameters ◽  
Treatment Conditions ◽  
Isothermal Kinetic ◽  
And Storage ◽  
Kinetics Of ◽  
Opuntia Dillenii

Betacyanin stability was assessed over temperatures ranging from 60 to 90 °C for cactus pear (Opuntia dillenii Haw.) juice. The juice showed a betacyanin content of 0.76 g/kg. The rate constants for the betacyanin degradation and isothermal kinetic parameters were calculated according to the following three models: Arrhenius, Eyring, and Ball. The fittings of the models were found to be close to one other with SSE values of 0.0964, 0.0964, and 0.0974, respectively. However, because the estimated parameters for the Ball equation happened to be less correlated than the parameters of the other models, this equation was then used for the simulations. The parameters for z and D0 were 42.21 °C and 6.79 × 104 s, respectively. Betacyanins were found to resist typical heat treatment conditions (F70°C values between 100 and 200 min), with a maximum loss of 10% when the temperature was above 80 °C. The time/temperature combinations that could assure both the safety of the product and the preservation of the betacyanins were identified. With Enterococcus faecalis as the reference, when the temperature was 100 °C, the pasteurization time satisfying these two conditions was 0.6 min, whereas it was 180 min when the temperature was 62 °C. The degradation of betacynins during storage was positively correlated with temperature and was accompanied by the appearance of a brown shade.

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