The effect of temperature, pH, and ionic strength on color stability of red wine

Tetrahedron ◽  
2015 ◽  
Vol 71 (20) ◽  
pp. 3027-3031 ◽  
Author(s):  
Zsuzsanna Czibulya ◽  
Ibolya Horváth ◽  
László Kollár ◽  
Martin Pour Nikfardjam ◽  
Sándor Kunsági-Máté
Keyword(s):  
Ionic Strength ◽  
Red Wine ◽  
Color Stability ◽  
Effect Of Temperature

Gel filtration studies of oxyhemerythrin. II. Effect of temperature and ionic strength on the association-dissociation equilibriums

Biochemistry ◽  
1975 ◽  
Vol 14 (19) ◽  
pp. 4286-4291 ◽  
Author(s):  
Kim Hock Tan ◽  
Steven Keresztes-Nagy ◽  
Allen Frankfater
Keyword(s):  
Ionic Strength ◽  
Gel Filtration ◽  
Effect Of Temperature

scholarly journals Modeling the effect of temperature on rheological properties of red wine

2018 ◽  
Author(s):  
Anisa Dhroso ◽  
Hasime Manaj ◽  
Ilirjan Malollari ◽  
Berisha Varvara
Keyword(s):  
Rheological Properties ◽  
Red Wine ◽  
Effect Of Temperature

scholarly journals Influence of a Bleaching Agent on the Color Stability of Indirect Composite Resins Immersed in Dyes

Ceramics ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 235-245
Author(s):  
Daniele dos Santos ◽  
Emily da Silva ◽  
Juliani Mendonça ◽  
Denis Cetrangolo ◽  
Fernanda Caxias ◽  
...  
Keyword(s):  
Red Wine ◽  
Artificial Saliva ◽  
Color Stability ◽  
Composite Resins ◽  
Bleaching Agent ◽  
Initial State ◽  
Honestly Significant Difference ◽  
Significant Difference ◽  
Indirect Composite ◽  
Bleaching Action

This study aimed to evaluate the effect of a bleaching agent on the color of extrinsically pigmented indirect composite resins. Samples of five resins (Adoro, Resilab, Cristobal, Sinfony, Epricord) were manufactured and divided into five groups: red wine, coffee, orange juice, Coca-Cola, and artificial saliva (control). The stained samples were immersed in a 38% hydrogen peroxide solution for 30 min per week, over three weeks. Color readings were performed at the initial state (L0), after 21 days of dye immersion (ΔE1, L1), and after 7 (ΔE2, L2), 14 (ΔE3, L3), and 21 days (ΔE4, L4) of bleach immersion. Data were subjected to ANOVA and Tukey’s honestly significant difference (HSD) test (α = 0.05). The color alteration was greater in ΔE1, regardless of color solution, indicating extrinsic pigmentation. The Resilab group exhibited greater ΔE1 values than the other resins. The bleaching agent promoted bleaching action on the surfaces of the materials studied, removing the previously impregnated pigments.

scholarly journals Compositional and Temperature Effects on the Rheological Properties of Polyelectrolyte–Surfactant Hydrogels

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 927 ◽  
Author(s):  
Jiří Smilek ◽  
Sabína Jarábková ◽  
Tomáš Velcer ◽  
Miloslav Pekař
Keyword(s):  
Ionic Strength ◽  
Rheological Properties ◽  
Surfactant Concentration ◽  
Background Electrolyte ◽  
Effect Of Temperature ◽  
Physical Interactions ◽  
Chain Conformations ◽  
Oppositely Charged ◽  
Electrolyte Ph ◽  
Positively Charged

The rheological properties of hydrogels prepared by physical interactions between oppositely charged polyelectrolyte and surfactant in micellar form were studied. Specifically, hyaluronan was employed as a negatively charged polyelectrolyte and Septonex (carbethopendecinium bromide) as a cationic surfactant. Amino-modified dextran was used as a positively charged polyelectrolyte interacting with sodium dodecylsulphate as an anionic surfactant. The effects of the preparation method, surfactant concentration, ionic strength (the concentration of NaCl background electrolyte), pH (buffers), multivalent cations, and elevated temperature on the properties were investigated. The formation of gels required an optimum ionic strength (set by the NaCl solution), ranging from 0.15–0.3 M regardless of the type of hydrogel system and surfactant concentration. The other compositional effects and the effect of temperature were dependent on the polyelectrolyte type or its molecular weight. General differences between the behaviour of hyaluronan-based and cationized dextran-based materials were attributed to differences in the chain conformations of the two biopolymers and in the accessibility of their charged groups.

Effect of temperature on quantifying glycated (glycosylated) hemoglobin by cation-exchange chromatography.

1985 ◽  
Vol 31 (1) ◽  
pp. 114-117 ◽  
Author(s):  
R Flückiger ◽  
T Woodtli
Keyword(s):  
Ionic Strength ◽  
Cation Exchange ◽  
High Performance ◽  
Glycated Hemoglobin ◽  
Operating Temperature ◽  
Glycosylated Hemoglobin ◽  
Regression Line ◽  
Exchange Chromatography ◽  
Effect Of Temperature ◽  
Cation Exchange Chromatography

Abstract As a consequence of nonideal chromatographic conditions, values for stable glycated hemoglobin (HbA1c) determined by cation-exchange chromatography in a commercial minicolumn system (y) or by "high-performance" liquid chromatography (x) differ markedly, yielding the regression line y = 0.82x + 0.6. With use of the protocol specified by the manufacturer, 20% of the HbA1c peak is not collected in the HbA1c fraction. Increasing the ionic strength of the eluting buffer by increasing the operating temperature to 28 degrees C increases the rate of elution from the minicolumn, making results of the two methods more closely comparable (y = 0.98x - 0.22). Because at a given pH the elution volume is determined primarily by the ionic strength, close limits on the composition of the eluting buffer are set by the temperature-dependence of its ionic strength. At a specified temperature and pH the position of a peak can be judged to within a volume of 1 mL if the conductivity of the eluent does not vary by more than +/- 0.05 mS.

scholarly journals A method for investigating the effect of temperature on the 695 nm band of insoluble cytochrome c

1975 ◽  
Vol 149 (1) ◽  
pp. 169-177 ◽  
Author(s):  
T A Moore ◽  
C Greenwood
Keyword(s):  
Ionic Strength ◽  
Cytochrome C ◽  
Computer Analysis ◽  
Standard Enthalpy ◽  
Entropy Change ◽  
Enthalpy Change ◽  
Effect Of Temperature ◽  
Standard Entropy ◽  
Ferricytochrome C ◽  
Standard Enthalpy Change

A method is described for computer analysis of simple spectrophotometric changes in particulate systems, and this has been applied to the bleaching of the 695 nm band of insoluble ferricytochrome c by temperature. The results show that insolubilization has no effect on the standard enthalpy change but lowers the value for the standard entropy change. This effect appears to be independent of the concentration of the gel matrix to which the cytochrome c is bound, but dependent on the ionic strength of the surrounding solution.

Color Stability of Heat-Cured Denture Base Resins

2015 ◽  
Vol 1088 ◽  
pp. 519-525
Author(s):  
Hua Li Huang ◽  
Dan Feng ◽  
Hai Huan Gong ◽  
Ai Yang Song ◽  
Song Zhu
Keyword(s):  
Water Absorption ◽  
Red Wine ◽  
Color Change ◽  
Artificial Saliva ◽  
Color Stability ◽  
Denture Base ◽  
Color Changes ◽  
Dental Resins ◽  
Base Resin ◽  
Storage Times

Heat-cured denture base resin is an important component in removable partial dentures and complete dentures, and has been widely used in the clinic. However, during long-term use, its appearance may be affected by varying degrees of color change, affecting the appearance and longevity of the dentures. In this study we examined the color changes and water absorption and solubility of dental base resins to investigate the color stability of four types of resin materials: New Century, Heraeus, Nissin and BASIS-HI. They were soaked in artificial saliva (as control), red wine, cola, coffee and tea separately at 37°C for 1, 4 or 12 weeks. Results are presented on which the color changes of dental base resin materials were associated with different denture base resins, soak solutions and storage times. We found that most of the dental resins became darker at prolonged immersion time. Heraeus resins showed more significant changes after soaking in red wine for 12 weeks, and its water absorption and solubility values were also greater than those of the other three types of resins. The color changes of New Century, Nissin and BASIS-HI soaked in the four solutions were relatively stable. The information obtained here will help optimize maintenance of dentures and also inform choice of denture materials.

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