scholarly journals Effects of heat treatment and storage temperature on the use of açaí drink by nutraceutical and beverage industries

2012 ◽  
Vol 32 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Tatiane Regina Albarici ◽  
José Dalton Cruz Pessoa
Keyword(s):  
Temperature Effect ◽  
Storage Temperature ◽  
Life Time ◽  
Reaction Rate Constant ◽  
Anthocyanin Content ◽  
Order Kinetic ◽  
First Order ◽  
The Stability ◽  
And Storage ◽  
Anthocyanin Degradation

This study assesses the storage temperature effect on the anthocyanins of pasteurized and unpasteurized açaí pulp. The data was obtained using a pasteurized and lyophilized pulp (PLP) to evaluate the temperature effect (0, 25, and 40 °C). Part of non-pasteurized frozen pulp (NPP) was pasteurized (NPP-P) at 90 °C for 30 seconds; both pulps were stored at 40 °C. The anthocyanin content reduction in the drink was evaluated from the half-life time (t1/2), activation energy (Ea), temperature quotient (Q10), and the reaction rate constant (k). The t1/2 of the PLP anthocyanins stored at 40 °C was 1.8 times less than that stored at 25 °C and 15 times less than that stored at 0 °C; therefore, the higher temperatures decreased the stability of anthocyanins. The pasteurization increased the t1/2 by 6.6 times (10.14 hours for NPP and 67.28 hours for NPP-P). The anthocyanin degradation on NPP-P followed a first order kinetic, while NPP followed a second order kinetic; thus it can be said that the pasteurization process can improve the preservation of anthocyanins in the pulp.

scholarly journals Kinetics Drying of Blackberry Bagasse and Degradation of Anthocyanins and Bioactive Properties

Antioxidants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 548
Author(s):  
Dorila E. Grández-Yoplac ◽  
Diner Mori-Mestanza ◽  
Lucas D. Muñóz-Astecker ◽  
Ilse S. Cayo-Colca ◽  
Efraín M. Castro-Alayo
Keyword(s):  
Reaction Rate Constant ◽  
Convective Drying ◽  
Water Evaporation ◽  
Total Phenolic ◽  
Order Kinetic ◽  
Drying Process ◽  
Drying Time ◽  
First Order ◽  
Order Kinetic Model ◽  
Anthocyanin Degradation

The process of drying food is necessary to preserve it; however, some bioactive compounds can be degraded during drying process. In this work, the convective drying process of Peruvian blackberry bagasse and the degradation of anthocyanins, total phenolic content (TPC), and antioxidant capacity (AC) were studied. The logarithmic model fitted well to the data and could predict the process, showing that 6 h of drying at 90 °C is enough to reach equilibrium moisture. Anthocyanin degradation followed a first-order kinetic model with reaction rate constant between 5.45 × 10−2 ± 4.68 × 10−3 and 1.21 × 10−1 ± 2.31 × 10−2 h−1, and activation energy of 25.11 kJ/mol. The highest retention (84.38%) of anthocyanins was obtained in 1 h at 50 °C and the highest degradation (68.54%) in 6 h at 90 °C. The TPC and AC increased with the drying time and temperature due to the increased water evaporation.

Stability of Bortezomib 1-mg/mL Solution in Plastic Syringe and Glass Vial

2005 ◽  
Vol 39 (9) ◽  
pp. 1462-1466 ◽  
Author(s):  
Pascal André ◽  
Salvatore Cisternino ◽  
Fouad Chiadmi ◽  
Audrey Toledano ◽  
Joël Schlatter ◽  
...  
Keyword(s):  
Storage Temperature ◽  
Color Change ◽  
Hplc Method ◽  
Initial Concentration ◽  
Plastic Syringe ◽  
The Mean ◽  
The Stability ◽  
And Storage ◽  
Mean Concentration ◽  
Antineoplastic Chemotherapy

BACKGROUND: The proteasome inhibitor bortezomib (BTZ), used in antineoplastic chemotherapy, must be diluted in NaCl 0.9% for injection and stored for no more than 3 hours in a syringe or 8 hours in a vial. Better information on its stability could improve storage. OBJECTIVE: To assess the stability of BTZ solution (1 mg/mL) in syringes and vials. METHODS: BTZ 1-mg/mL solutions were prepared by adding sterile NaCl 0.9% to Velcade vials containing 3.5 mg of lyophilized BTZ. Syringes were filled with 1 mL of solution and stored in the dark at 5 °C or 60 °C; others were not protected from light and stored at 22 °C. Velcade vials containing 1 mL of solution were stored at 5 °C in the dark. Samples were taken at various times over 23 days and assayed in duplicate. An HPLC method for assaying the stability of BTZ was validated. Appearance and pH were recorded. RESULTS: There was no color change or precipitation in the samples, and the pH was stable. Oxidation, light, and storage temperature all affected the chemical stability of BTZ. The mean concentrations of BTZ in syringes stored for 2, 3, and 5 days at 60, 22, and 5 °C were >95% of the initial concentration. The mean concentration of BTZ in vials stored for 5 days at 5 °C was >95% of the initial concentration. CONCLUSIONS: BTZ stored refrigerated in vials or syringes and protected from light is chemically stable for 5 days after reconstitution.

Evaluation of different samplers and storage temperature effect on the methane carbon stable isotope analysis

2018 ◽  
Vol 190 (10) ◽  
Author(s):  
Victor H. J. M. dos Santos ◽  
Diane O. Laroque ◽  
Caroline I. Baum ◽  
Pâmela de M. Engelmann ◽  
Rogério V. Lourega ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Temperature Effect ◽  
Stable Isotope Analysis ◽  
Storage Temperature ◽  
Isotope Analysis ◽  
Carbon Stable Isotope ◽  
And Storage ◽  
Methane Carbon

scholarly journals PENANGANAN PRODUKSI BUAH PISANG PASCA PANEN MELALUI MODEL PENGENDALIAN GAS ETILEN

2018 ◽  
Vol 15 (2) ◽  
pp. 173-187 ◽  
Author(s):  
M Dafri ◽  
R Ratianingsih ◽  
Hajar Hajar
Keyword(s):  
Jacobian Matrix ◽  
Storage Temperature ◽  
Minimum Principle ◽  
Economic Value ◽  
Life Time ◽  
Pontryagin Minimum Principle ◽  
The Third ◽  
Fourth Case ◽  
The Stability ◽  
Is Design

Bananas is a kind of fruit that has many benefits and economic value. However, because it is perishable, an unappropriate post-harvest handling will decreasing the economic value. Many factors affect the ripening of bananas, one of it is ethylene gas. The ethylene gas that contained in the banana flows from the higher concentration to the lower one. The flow should be controlled in order to make it decaying properly. Temperature is a parameter that affects the flow of ethylene. This research offers storage temperature regulation such that the life time of banana could be extended. A mathematical model that represents the ethylene flow among the subpopulations is discussed. The population are devided into sub-population of unripe bananas, normal ripe bananas, ripe bananas wounds, and rotten bananas. The Stability of the model is evaluated in the critical point by Jacobian matrix and the Routh Hurwitz Criteria. The control is design by minimizing the temperature parameters using the Pontryagin Minimum Principle. Simulation is ilustrated in four cases, the firts case is no bananas wound initially, second case is no bananas rot initially, third case is no ripened normal bananas initially, and the fourth case is the bananas ripe initially exiting. The simulations shows that before controling the temperature, in the amount of 120 bananas of firts case, the proces is condcuted in sixteen days, ten days for the second case, nine days for the third case, and eight days for the fourth case. After controling the temperature, for some amount of bananas of firts case, the proces is conduted in seventeen days, eleven days for the second case, ten days for the third case, and nine days for the fourth case.

TiO2nanoparticles and CQDs co-decorated mesoporous g-C3N4and their photocatalytic properties for gaseous benzene degradation

2019 ◽  
Vol 12 (06) ◽  
pp. 1950086 ◽  
Author(s):  
Chunxia Zhao ◽  
Heng Jia ◽  
Wei Jin ◽  
Feng Li ◽  
Hang Li ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Carbon Quantum Dots ◽  
Reaction Rate Constant ◽  
Order Kinetic ◽  
Kinetic Reaction ◽  
First Order ◽  
Benzene Degradation ◽  
Visible Light Range ◽  
Carrier Separation ◽  
Gaseous Benzene

Mesoporous g-C3N4is prepared by a hard template method and is then decorated by carbon quantum dots (CQDs) and TiO2nanoparticles through an impregnation route followed by a hydrothermal method. The synthesized hybrids possess higher specific surface area up to 131[Formula: see text]cm2/g and show effective absorption of visible light range and improved instantaneous photocurrent response, which reveals the enhanced photo-generated carrier separation efficiency. The first-order kinetic reaction rate constant of photocatalytic degradation of gaseous benzene by TCPCN-2 is 5.5 times of the bulk g-C3N4. Its degradation rate is up to 96.08% with good photocatalytic stability. Thus, the TiO2nanoparticles and CQDs co-decorated g-C3N4hybrids are promising photocatalysts.

scholarly journals Stability of tetracycline residues in honey

2012 ◽  
Vol 77 (7) ◽  
pp. 879-886 ◽  
Author(s):  
Cara Cristina ◽  
Dumitrel Gabriela-Alina ◽  
Glevitzky Mirel ◽  
Perju Delia
Keyword(s):  
Life Time ◽  
Order Kinetic ◽  
First Order ◽  
Reaction Rate Constants ◽  
Veterinary Medicines ◽  
West Region ◽  
Tetracycline Degradation ◽  
Order Kinetic Model ◽  
Tetracycline Residues ◽  
Kinetics Of

The problem of availability of veterinary medicines to treat honeybees is discussed extensively worldwide. An uncontrolled administration of antibiotics may lead to contamination of beehive products and contributes to the problem of food safety. In this study, the kinetics of tetracycline (TC) degradation in honey was studied for samples provided by four sideline beekeepers located in the west region of Romania. The samples of honey were stored in the dark at room temperature for 30 days and subsamples were analyzed every 3 days by Elisa method. The results of the study revealed that the level of tetracycline decreases in time for all honey samples. The tetracycline degradation follows a first-order kinetic model with reaction rate constants between 1.2?10-3 - 2?10-3 days-1. The half-life time of tetracycline in monofloral honeys: acacia and lime was 251 and 232 days respectively. Tetracycline degradation in polyfloral honey was accelerated since ?1/2 of TC was 151 days.

scholarly journals Extraction of bioactive compounds and free radical scavenging activity of purple basil (Ocimum basilicum L.) leaf extracts as affected by temperature and time

2016 ◽  
Vol 88 (2) ◽  
pp. 1055-1068 ◽  
Author(s):  
ALESSANDRA C. PEDRO ◽  
FERNANDA MOREIRA ◽  
DANIEL GRANATO ◽  
NEIVA D. ROSSO
Keyword(s):  
Bioactive Compounds ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Ocimum Basilicum ◽  
Anthocyanin Content ◽  
Leaf Extracts ◽  
First Order ◽  
First Order Kinetics ◽  
Potential Source ◽  
The Stability

In the current study, response surface methodology (RSM) was used to assess the effects of extraction time and temperature on the content of bioactive compounds and antioxidant activity of purple basil leaf (Ocimum basilicum L.) extracts. The stability of anthocyanins in relation to temperature, light and copigmentation was also studied. The highest anthocyanin content was 67.40 mg/100 g extracted at 30 °C and 60 min. The degradation of anthocyanins with varying temperatures and in the presence of light followed a first-order kinetics and the activation energy was 44.95 kJ/mol. All the extracts exposed to light showed similar half-lives. The extracts protected from light, in the presence of copigments, showed an increase in half-life from 152.67 h for the control to 856.49 and 923.17 h for extract in the presence of gallic acid and phytic acid, respectively. These results clearly indicate that purple basil is a potential source of stable bioactive compounds.

scholarly journals Impacts of Temperature on the Stability of Tropical Plant Pigments as Sensitizers for Dye Sensitized Solar Cells

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Aiman Yusoff ◽  
N. T. R. N. Kumara ◽  
Andery Lim ◽  
Piyasiri Ekanayake ◽  
Kushan U. Tennakoon
Keyword(s):  
Storage Temperature ◽  
Low Cost ◽  
Dye Sensitized Solar Cells ◽  
Anthocyanin Content ◽  
Fruit Pulp ◽  
Melastoma Malabathricum ◽  
Tropical Plant ◽  
Photovoltaic Efficiency ◽  
Codiaeum Variegatum ◽  
The Stability

Natural dyes have become a viable alternative to expensive organic sensitizers because of their low cost of production, abundance in supply, and eco-friendliness. We evaluated 35 native plants containing anthocyanin pigments as potential sensitizers for DSSCs. Melastoma malabathricum (fruit pulp), Hibiscus rosa-sinensis (flower), and Codiaeum variegatum (leaves) showed the highest absorption peaks. Hence, these were used to determine anthocyanin content and stability based on the impacts of storage temperature. Melastoma malabathricum fruit pulp exhibited the highest anthocyanin content (8.43 mg/L) followed by H. rosa-sinensis and C. variegatum. Significantly greater stability of extracted anthocyanin pigment was shown when all three were stored at 4∘C. The highest half-life periods for anthocyanin in M. malabathricum, H. rosa-sinensis, and C. variegatum were 541, 571, and 353 days at 4∘C. These were rapidly decreased to 111, 220, and 254 days when stored at 25∘C. The photovoltaic efficiency of M. malabathricum was1.16%, while the values for H. rosa-sinensis and C. variegatum were 0.16% and 1.08%, respectively. Hence, M. malabathricum fruit pulp extracts can be further evaluated as an alternative natural sensitizer for DSSCs.

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