scholarly journals Preliminary Results for Improving the Colloidal Stability of Sunflower Tahini and Halva Products by Wax Based Oleogelation Mechanism

2021 ◽  
Vol 78 (2) ◽  
pp. 84
Author(s):  
Anda Elena TANISLAV ◽  
Andreea PUȘCAȘ ◽  
Andruța MUREȘAN ◽  
Georgiana MARȚIȘ (PETRUȚ) ◽  
Romina MARC (VLAIC) ◽  
...  
Keyword(s):  
Storage Time ◽  
Colloidal Stability ◽  
Natural Phenomenon ◽  
Current Trends ◽  
Textural Parameters ◽  
Textural Changes ◽  
The Stability ◽  
Main Effects ◽  
And Storage ◽  
Confectionery Product

Halva is a confectionery product based on nougat and different oilseeds paste called tahini.  The oil separation during storage has been considered a normal and natural phenomenon, but current trends consider this process a defect that gives a depreciated commercial appearance. Thus, the aim of this work was to assess the influence of edible waxes addition on the stability, textural changes, and sensorial acceptance of sunflower halva. Firstly, tahini samples containing several waxes (sunflower, carnauba, rice bran and beeswax) in different concentrations (1%, 2%, 3%) were prepared and their textural parameters and colloidal stability (CS) during storage was determined. The samples (excepting the 1% containing beeswax) demonstrated higher CS (p<0.05) as compared to the reference  prepared without wax. The main effects: wax type and storage time, accounted 51.64%, and 18.58%, respectively of the tahini CS variability. When it comes for the halva, the CS of all samples containing different waxes (excepting the sample with 1% beeswax) showed statistically significant (p<0.05) higher values in comparison to the reference which registered the lowest CS (94.06%).

scholarly journals Stilbenes in grapes and wines of Tannat, Marselan and Syrah from Uruguay

OENO One ◽  
2020 ◽  
Vol 54 (1) ◽  
pp. 27-36
Author(s):  
Guzmán Favre ◽  
Diego Piccardo ◽  
Gómez-Alonso Sergio ◽  
José Pérez-Navarro ◽  
Esteban García-Romero ◽  
...  
Keyword(s):  
Storage Time ◽  
Solid Phase ◽  
Multiple Reaction Monitoring ◽  
Grape Cultivar ◽  
Grape Berries ◽  
Harvest Dates ◽  
Degree Of Maturity ◽  
The Stability ◽  
And Storage ◽  
Do So

Aim: The aim of the study was to investigate the stilbene composition of grapes and wines of the Vitis vinifera cultivars Tannat, Marselan and Syrah cultivated in Uruguay. The effects of delaying the harvest on stilbene concentrations were determined, and the stability of stilbenes during wine storage was assessed.Methods and results: Stilbene concentrations were determined in the grapes and wines of two vintages (2015 and 2016) and two harvest dates for each cultivar. Vinification was carried out by traditional maceration, and samples of the wines of each vintage were analysed in the period from 3 months after devatting to up to 24 months later. After solid-phase extraction, stilbenes were identified and quantified by HPLC-ESI-MS/MS using a multiple reaction-monitoring approach. In the grape berries, stilbene concentrations were between 1.6 and 7.7 mg/kg, depending on grape cultivar, growing season, and in Syrah, harvest date. In the wines, stilbene concentrations were initially between 0.9 and 5.0 mg/L, being highest in Syrah, lowest in Marselan, and intermediate in Tannat. Stilbene concentrations in the Marselan wines were lower than expected based on stilbene concentrations in the grapes from which they were produced, suggesting poor extraction during winemaking. Total stilbene concentrations remained very stable during the analytical period.Conclusions: Delaying the harvest does not necessarily increase the stilbene content of grapes, but it can do so significantly, as shown for Syrah. For some grape cultivars, such as Marselan, poor extraction of stilbenes during winemaking can limit their concentrations in the resulting wines.Significance and impact of the study: The results of this study show the relevance of grape cultivar, degree of maturity and storage time may have into stilbenes. They provide reference data on the stilbene composition of grapes and wines produced under Uruguayan winegrowing conditions. The high stability of stilbenes during wine storage is relevant for consumers interested in red wine as a source of bioactive compounds. In memory of Prof. Isidro Hermosín-Gutiérrez.

scholarly journals Evaluation of an ELISA for metanephrines in feline urine

2018 ◽  
Vol 30 (6) ◽  
pp. 887-893
Author(s):  
Thanikul Srithunyarat ◽  
Anna Svensson ◽  
Sofia Hanås ◽  
Odd V. Höglund ◽  
Ragnvi Hagman ◽  
...  
Keyword(s):  
Neuroendocrine Tumors ◽  
Home Environment ◽  
Human Urine ◽  
Room Temperature ◽  
Storage Time ◽  
Stability Study ◽  
Urine Samples ◽  
Urine Sampling ◽  
The Stability ◽  
And Storage

Catecholamines can be used to evaluate neuroendocrine tumors, stress, and potentially pain, but catecholamines degrade rapidly. Their metabolites normetanephrine (NME) and metanephrine (ME) have better stability in urine. In cats, urine sampling in a home environment would be beneficial to reduce effects of clinical stress and simplify sampling. We evaluated a human urine ELISA for analysis of NME and ME in feline urine, and investigated the effects of acidification, cat tray pellets, and storage time at room temperature up to 8.5 h. In 26 feline urine samples, mean NME concentration was 192 ± 80 ng/mL, mean intra- and inter-assay CV was 6.5% and 4.2%, respectively, and spike recovery was 98–101%, but dilutional recovery was unsatisfactory. For ME, mean intra- and inter-assay CV was 10.2% and 4.1%, respectively. Mean urine ME concentration was 32.1 ± 18.3 ng/mL, close to the kit’s lowest standard, and spike recovery was 65–90%; the ELISA could not be validated for ME. The stability study, performed for NME on 12 urine samples, did not identify differences between acidified and non-acidified samples, cat tray pellets, or storage time, and no interaction effects. The ME ELISA was not suitable for feline urine; performance of the NME ELISA was acceptable, except for dilution recovery. For analysis of NME, feline urine can be sampled at home using cat tray pellets and stored at room temperature up to 8.5 h without acidification.

Polyphenol antioxidants from cocoa pods: Extraction optimization, effect of the optimized extract, and storage time on the stability of palm olein during thermoxidation

2018 ◽  
Vol 42 (5) ◽  
pp. e13592 ◽  
Author(s):  
Gires Boungo Teboukeu ◽  
Fabrice Tonfack Djikeng ◽  
Mathilde Julie Klang ◽  
Serge Houketchang Ndomou ◽  
Mallampalli Sri Lakshmi Karuna ◽  
...  
Keyword(s):  
Storage Time ◽  
Palm Olein ◽  
Extraction Optimization ◽  
The Stability ◽  
And Storage

Qualitative and Textural Changes in Fresh Okra Pods (Hibiscus esculentus L.) under Modified Atmosphere Packaging in Perforated Film Packages

2009 ◽  
Vol 15 (2) ◽  
pp. 131-138 ◽  
Author(s):  
D.R. Rai ◽  
S. Balasubramanian
Keyword(s):  
Modified Atmosphere Packaging ◽  
Modified Atmosphere ◽  
Green Color ◽  
High Loss ◽  
Textural Parameters ◽  
Hibiscus Esculentus ◽  
Bright Green ◽  
Textural Changes ◽  
And Storage ◽  
Loss Of Strength

Improper post-harvest handling and storage under room temperature lead to high loss of moisture resulting in loss of strength and development of flaccidity in okra tissues, apart from the loss of its characteristic green color. In this study, different weights of freshly harvested okra pods (Hibiscus esculentus L.) were stored at 15°C and 75% relative humidity packaged under modified atmosphere (MAP) in 35 μm thick polypropylene film packages to assess the effect of different in-pack gaseous compositions of O2 and CO2 on the properties of okra. During storage, the normal freshness indicators of okra namely, the bright green color and ease of snapping at the tip served as the prominent qualitative and textural parameters, indicative of the acceptability of okra. Results indicated that an in-pack gaseous range for O2 (6.3-8.4%) and CO2 (10.7-11.8%) under MAP resulted in maintenance of green color and β-carotene in the pericarp, and ascorbic acid in the seeds as well as other qualitative parameters. Further, the texture analysis of okra at the pre-determined snapping point at the tip and also along the longitudinal portion showed that MAP stored okra were snapping easily at the tips and had a very slight increase in the other mechanical properties which were considered to be within acceptable limits.

scholarly journals IMMOBILIZATION AND APPLICATION OF PARTIAL PURIFIED LOVASTATIN PRODUCED FROM LOCAL ISOLATE ASPERGILLUS TERREUS A50 USING SOLID STATE FERMENTATION

2021 ◽  
Vol 52 (2) ◽  
Author(s):  
A. J. R. Al-Sa'ady ◽  
G. M. Aziz
Keyword(s):  
Cell Line ◽  
Storage Time ◽  
Specific Activity ◽  
Dependent Manner ◽  
Hmg Coa Reductase ◽  
Minimum Fungicidal Concentration ◽  
E Coli ◽  
The Stability ◽  
Coa Reductase ◽  
And Storage

This work was designed to study the free and immobilized partial purified lovastatin in various applications. The results of HMG-CoA reductase inhibition showed enzyme inhibition at 10 mM of standard and partial purified lovastatin with specific activity 0.056 and 0.062 U/mg protein respectively, compared with specific activity 0.277 U/mg protein without inhibitor. The results of the thermal stability and storage time on lovastatin for inhibition of HMG-CoA reductase demonstrated that the standard and partial purified lovastatin were stabled in temperatures between 20-40 ᵒC, then the stability begun to decrease at 45 ᵒC, while lovastatin was stable in storage time between 1- 8 hours, then the stability begun to decrease after ten hours at 40 ºC. The results of MIC for lovastatin were demonstrated that most tested concentration were showed antibacterial activity of free and immobilized partial purified lovastatin against Candida albicans, Escherichia coli, and Staphylococcus aureus with MIC values ranging from 15 to 75 µg/ml. Whereas the results of minimum bactericidal concentration (MBC) and minimum fungicidal concentration (MFC) showed that C. albicans, E. coli, and S. aureus had no growth with concentration ranging from 55 to 75, 55 to 75, and 30 to 75 µg/ml, respectively. As well as the results of the cytotoxic impact using MTT experiment indicated that partial purified lovastatin caused a reduction in cells viability (p ≤ 0.05) at a dose-dependent manner on MCF-7 cell lines, with a calculating IC50 of 138.1 µg/ml, compare with normal cell line (WRL 68 Cell Line) at IC50 of 198.7 µg/ml.

scholarly journals 020 UNICONAZOLE TREATMENT IN PROPAGATION AFFECTS ELONGATION OF CHRYSANTHEMUM CUTTINGS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 430d-430
Author(s):  
Richard Kent Schoellhorn ◽  
James E. Barrett ◽  
Terril A. Nell
Keyword(s):  
Significant Interaction ◽  
Storage Time ◽  
Quadratic Relationship ◽  
Main Effects ◽  
And Storage

Treatments were cultivar, uniconazole concentrations (0, 2, 4, or 8ppm), and time between dip and placement under mist (0, 10, or 60 minutes). Unrooted chrysanthemum cuttings of cultivars `Tara' and `Boaldi' were dipped in uniconazole solutions for 10 seconds. Data were taken 16 days after treatment. A quadratic relationship was found for the interaction between concentration and cultivar. `Tara': (y = 6.7277-1.532(x) + 0.119409(x2)) and `Boaldi': (y= 6.4676-0.884(x)+0.060020(x 2). Time had no significant interaction with either cultivar or uniconazole concentration. In a second study, with uniconazole concentrations and storage time (10 minutes or 12 hours), main effects and the cultivar concentration interaction were significant.

scholarly journals The Stability of Vitamin A from Different Sources in Vitamin Premixes and Vitamin-Trace Mineral Premixes

2021 ◽  
Vol 11 (8) ◽  
pp. 3657
Author(s):  
Pan Yang ◽  
Huakai Wang ◽  
Longxian Li ◽  
Nan Zhang ◽  
Yongxi Ma
Keyword(s):  
Vitamin A ◽  
Room Temperature ◽  
Storage Time ◽  
Sampling Point ◽  
Finishing Pigs ◽  
Trace Mineral ◽  
Main Effect ◽  
The Stability ◽  
Main Effects ◽  
Different Sources

This study was conducted to investigate the stability of five commercial vitamin A products in vitamin premixes and vitamin-trace mineral premixes. The five commercial products used were: Xinhecheng, Zhejiang medicine, Kingdomway, DSM, and BASF. The vitamin A products were stored in three vitamin premixes (for suckling, weanling, and finishing pigs) or in vitamin-trace mineral (VTM) premixes (for suckling, weanling, and finishing pigs). Vitamin premixes were stored in an environmentally controlled chamber set at 25 °C and 60% humidity. The VTM premixes were stored at room temperature (approximately 22 °C). Sampling was performed on d 0, 90, 180, 270, and 360. Stability was reported as the residual vitamin A activity (% of initial) at each sampling point. For the stability of vitamin premixes, all interactive and main effects of storage time and vitamin A product were not significant. For the stability of VTM premixes, there was no significant interaction effects between storage time, vitamin A product and main effect of vitamin A product, but the main effect of storage time was significant (p < 0.01). In conclusion, a longer storage time reduced vitamin A activity in VTM premixes but there was no difference in the stability of commercially available vitamin A.

scholarly journals Impact of storage conditions and storage time on silver nanoparticles' physicochemical properties and implications for their biological effects

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 84172-84185 ◽  
Author(s):  
E. Izak-Nau ◽  
A. Huk ◽  
B. Reidy ◽  
H. Uggerud ◽  
M. Vadset ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Physicochemical Properties ◽  
Storage Time ◽  
Biological Effects ◽  
Storage Conditions ◽  
Capping Agent ◽  
The Stability ◽  
The Impact ◽  
And Storage

A multi-parametric assessment of the impact of storage time/conditions and capping agent charge on the stability and toxicity of AgNPs showed agglomeration, dissolution, oxidation, capping agent degradation and attachment of Ag+ ions all play a role.

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