Research on the Stability and Content Detection of Anthocyanin of Black Peanuts Clothing

2015 ◽  
Vol 1090 ◽  
pp. 123-129
Author(s):  
Yue Shao ◽  
Xiang Long Liu ◽  
Hong Shao ◽  
Yun Jiao Li
Keyword(s):  
Metal Ions ◽  
Ph Value ◽  
Technological Condition ◽  
Extraction Temperature ◽  
Peanut Skin ◽  
The Stability ◽  
Preservation Rate

The experiment determined the containment of anthocyanin from the black peanut skin and stability of the anthocyanin under different temperature, pH value, illumination conditions and different concentration of metal ions (including Cu2+, Mn2+, Mg2+ and Fe3+). The anthocyanin was extracted under the optimum technological condition: ratio of material to liquid 1:50, 60% ethanol as extractant, extraction temperature 60°C and time 80min. The black peanut skin contains 1.03% anthocyanin, of which the absorbance decreases when pH value lowers 5.0 but rises there after and the color turns to the trend of blue gradually. Also, the closer the pH value reaches to 7.0, the better preservation rate of anthocyanin it has. Apparently, the absorbance stays at the highest level when the concentration of Mn2+ or Mg2+ is 2.00mmol/L and it rises with the concentration of Fe3+ or Cu2+ increasing. No flocculation was found to the anthocyanin by Fe3+.

Study on Extraction Technology and Stability of Melanin from Banana Peel

2013 ◽  
Vol 815 ◽  
pp. 287-292
Author(s):  
Li Jing Min ◽  
Jing Fen Li
Keyword(s):  
Metal Ions ◽  
Light Source ◽  
Room Temperature ◽  
Ph Value ◽  
Orthogonal Test ◽  
Raw Material ◽  
Banana Peel ◽  
Extraction Temperature ◽  
Solution Ph ◽  
Extraction Technology

[Objectiv The aim is to study the extraction technology of melanin from banana peel, and discuss its stability. [Metho We used banana peel as raw material, the absorbance at 410 nm as the index, extracted melanin by base-acid method, and optimized the extraction technology by the single factor and orthogonal test. Then we discussed the melanins stability at different temperature, light source, pH value, metal ions, antioxidant and reducing agents.[Result The best extraction conditions of melanin is that, hydrochloric acid soak time 5 h, alkaline solution pH value 14, extracting time 20 min, extraction temperature 70 °C, absorbance value about 0.309 A. Melanin from banana peel is stable at high temperature, different light source irradiation, reducing agent coexist; but at room temperature, metal ions and oxidizing agent coexist, it is unstable. [Conclusio This study provided experimental basis for the optimization and development of melanin from banana peel.

Effects of Metal Ions on the Stability of Purple Sweet Potato Pigment

2011 ◽  
Vol 396-398 ◽  
pp. 1325-1328
Author(s):  
Su Hong Li ◽  
Tuo Ping Li ◽  
Wei Na Fu ◽  
Xiao Juan Yu ◽  
Zhong Shen Zhao ◽  
...  
Keyword(s):  
Metal Ions ◽  
Sweet Potato ◽  
Natural Food ◽  
Long Term Storage ◽  
Color Density ◽  
Purple Sweet Potato ◽  
The Stability ◽  
Initial Storage ◽  
Preservation Rate

Purple sweet potato pigment is a natural food pigment, the stability is important to its quality assurance. The effects of metal ions on the stability of purple sweet potato pigment were investigated. The results showed that Mg2+and Fe3+ were conductive to pigments stability in the initial storage, and with the concentration increased, the pigment was more stable. But K+, Ca2+, Na+, Cu2+, Mg2+ and Fe3+ had brought the color density, the color intensity and the preservation rate of purple sweet potato pigment down in the long-term storage.

Study on Properties of PG Separated and Purified from Actinidia arguta

2013 ◽  
Vol 850-851 ◽  
pp. 1197-1201
Author(s):  
Shu Qian Li ◽  
Chang Jiang Liu ◽  
Guang Xin ◽  
Bo Zhang
Keyword(s):  
Metal Ions ◽  
Ph Value ◽  
Michaelis Constant ◽  
Actinidia Arguta ◽  
Ph Values ◽  
Key Enzyme ◽  
Optimal Reaction Temperature ◽  
The Stability ◽  
Thermo Stability ◽  
Optimal Reaction

Polygalacturonase (PG) is key enzyme for softening consenescence mechanism of fruits. In this work, Properties of PG separated and purified from wildActinidia Argutawere studied. The result shows that the optimal reaction temperature is 40°C with a high enzyme activity around 30-50°C. PG keeps a thermo stability at the temperature ranging from 30-40°C, which decreases with increasing of temperature and PG will lose all its activity under 60-70°C for 1h. The optimal reaction pH value for this enzyme is 5.5. As far as the stability in different pH values is concerned, PG is relatively stable for preservation at pH4.5-6.5.The michaelis constant for PG is 27.31. When the concentration for EDTA is higher than 2mmol/L, it is inhibitive for PG . The metal ions of K+, Ca2+, Fe2+, Fe3+, Mg2+can activate the PG enzyme to some extent, the strength of activation:Mg2+Fe3+K+Fe2+Ca2+;The metal ions of Cu2+Zn2+Mn2+Ba2+Al3+can inhibit PG enzyme to some extent, the strength of inhibition:Al3+Ba2+Mn2+Cu2+Zn2+.

Dyeing of Mulberry Silk Using Natural Safflower Yellow Pigment

2014 ◽  
Vol 670-671 ◽  
pp. 197-200
Author(s):  
Yan Mei Jia ◽  
Hong Wu Jiang
Keyword(s):  
Metal Ions ◽  
Ph Value ◽  
Yellow Pigment ◽  
Ph Change ◽  
Spectra Analysis ◽  
Visible Spectra ◽  
Color Yield ◽  
Silk Fabrics ◽  
Silk Dyeing ◽  
The Stability

A natural yellow pigment is extracted from carthamus tinctorious and the stability of the pigment on metal ions and the pH change are studied by visible spectra analysis. The extracts are applied to dye silk fabric and the dyeing properties are tested. Results show that the maximum absorption wavelength of the extract changed with pH value and metal ions. The safflower yellow pigment has good property for silk dyeing, the mordant dyed silk fabrics can obtain a deeper color yield and a better washing and rubbing color fastness.

Study on the Stability of Fruit Bromelain

2011 ◽  
Vol 421 ◽  
pp. 19-22 ◽  
Author(s):  
Hong Yu Liang ◽  
Mei Li ◽  
Ming Shi ◽  
An Ping Liao ◽  
Ru Chun Wu
Keyword(s):  
Metal Ions ◽  
Production Process ◽  
Ph Value ◽  
Inactivation Rate ◽  
Effect Of Temperature ◽  
Reduce Activity ◽  
Activity Loss ◽  
The Stability

In order to prevent the activity loss of bromelain activity in the production process, the effect of temperature, pH value and metal ions on bromelain activity of the extraction solution was studied. In the range, inactivation rate of bromelain activity for the extraction solution would be increased significantly when temperature exceeds 60°C. The most suitable for bromelain of casein acids hydrolysate temperature was 50-60°C;the fruit bromelain was stability at original pH value; Fe3+ and Cu2+ can strongly make bromelain reduce activity; at the same time, when the extraction solution diluted times was more than 200 times, bromelain activity didn’t basically changed.

scholarly journals Effect of Activity Coefficient of Polyvalent Ionic Salt Solution on Demulsification of Soy Lecithin Based Oil-in-Water Emulsion

2019 ◽  
pp. 1-11
Author(s):  
Pragasam Antony ◽  
Shivanand S. Bhat ◽  
Preeti N. Tallur ◽  
Vinayak M. Naik
Keyword(s):  
Activity Coefficient ◽  
Metal Ions ◽  
Lewis Acid ◽  
Salt Solution ◽  
Ph Value ◽  
Soy Lecithin ◽  
Ionic Solutions ◽  
Ionic Activity ◽  
Oil In Water ◽  
The Stability

Lecithin based Oil-in-Water (O/W) emulsion finds a lot of applications in food and cosmetic industries. The stability of O/W emulsion depends on properties of the emulsifying solution and the ionic impurities present. The present experiment well explained the role of polyvalent Lewis acid salt solution in establishing the stability of emulsion. Lewis acid salts solutions of NaCl, KNO3 BaCl2 MgCl2, Al2(SO4)3 and FeCl3 were used in the preparation of lecithin based O/W emulsion. The ionic activity coefficient calculated from Debye-Hückel limiting law (DHLL) for Lewis metal ions Na+, K+, Ba2+, Mg2+, Al3+ and Fe3+ were found to be 0.955, 0.965,0.869,0.872, 0.737 and 0.737 which directly decrease the pH value of the ionic solutions to 6.9,7.0,7.14,7.04, 2.2 and 2.5 respectively. The conductance of ionic solution increases with decrease in ionic activity coefficient. These trends very strongly destabilize the lecithin O/W emulsion showing a significant order of breakup time of different emulsion systems as 3.5, 2.0,1.4,1.0, 0.5 and 0.25 minutes. The effect of ionic activity coefficient on emulsion destabilization was well projected by microscopic view. Measurement of droplet diameter was conspicuous for monovalent and divalent metal ions ranging from 14-156 micrometer and number of larger droplets increases with increasing in the valence. However, the higher valence Al3+ and Fe3+ ionic solutions totally break the emulsion with immediate separation of oil and water layer having lower activity coefficients. Thus, the increased valence and conductance, decreased ionic activity coefficient and pH value of the emulsifying solution destabilize the soy lecithin based O/W emulsion significantly by increasing the interfacial tension and retarding the binding ability of the emulsifier.

REMOVAL OF HEAVY METAL Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II) IONS FROM AQUEOUS SOLUTION BY MENTHA PIPERITA EXTRACT

2020 ◽  
pp. 15-20
Author(s):  
Ersin Yucel ◽  
Mine Yucel
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
High Efficiency ◽  
Correlation Coefficients ◽  
Langmuir Model ◽  
Mentha Piperita ◽  
Freundlich Model ◽  
Biosorption Capacity ◽  
Peppermint Extract ◽  
The Stability

In this study, the usage of the peppermint (Mentha piperita) for extracting the metal ions [Mg (II), Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II)] that exist at water was investigated. In order to analyze the stability properties, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were used at removing the metal ions and the highest correlation coefficients (R2) were obtained at Langmuir isotherm. Therefore, it is seen that the Langmuir model is more proper than the Freundlich model. However, it was found that the correlation coefficients of removing Ni and Cd is higher at Freundlich model than Langmuir and low at Dubinin-Radushkevich isotherm. It is established that the biosorption amount increase depends on the increase of biosorbent and it can be achieved high efficiency (95%) even with small amount (0.6 mg, peppermint extract) at lead ions. It is also determined that the peppermint extracted that is used at this study shows high biosorption capacity for metal ions and can be used for immobilization of metals from polluted areas.

scholarly journals Solubility Data of Potential Salts in the MgO-CaO-SO2-H2O-O2 System for Process Modeling

Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 50
Author(s):  
Barbara D. Weiß ◽  
Michael Harasek
Keyword(s):  
Process Modeling ◽  
Ph Value ◽  
Process Models ◽  
Solubility Data ◽  
Solid Base ◽  
International Union ◽  
The Stability ◽  
Experimental Values ◽  
So2 Absorption ◽  
Reliable Basis

This review studies unwanted precipitation reactions, which can occur in SO2 absorption processes using a magnesium hydroxide slurry. Solubility data of potential salts in the MgO-CaO-SO2-H2O system are evaluated. The reviewed data can serve as a reliable basis for process modeling of this system used to support the optimization of the SO2 absorption process. This study includes the solubility data of MgSO3, MgSO4, Mg(OH)2, CaSO3, CaSO4, and Ca(OH)2 as potential salts. The solubility is strongly dependent on the state of the precipitated salts. Therefore, this review includes studies on the stability of different forms of the salts under different conditions. The solubility data in water over temperature serve as a base for modeling the precipitation in such system. Furthermore, influencing factors such as pH value, SO2 content and the co-existence of other salts are included and available data on such dependencies are reviewed. Literature data evaluated by the International Union of Pure and Applied Chemistry (IUPAC) are revisited and additional and newer studies are supplemented to obtain a solid base of accurate experimental values. For temperatures higher than 100 °C the available data are scarce. For a temperature range from 0 to 100 °C, the reviewed investigations and data provide a good base to evaluate and adapt process models for processes in order to map precipitations issues accurately.

scholarly journals The stability of pH value in the waters of Jiaozhou Bay

2021 ◽  
Vol 829 (1) ◽  
pp. 012021
Author(s):  
Dongfang Yang ◽  
Danfeng Yang ◽  
Haixia Li ◽  
Dong Lin ◽  
Qi Wang
Keyword(s):  
Ph Value ◽  
Jiaozhou Bay ◽  
The Stability

Studies on the Coordination Reaction of VO2+ and Tannic Acid in the Tannin Extract Desulfurization

2012 ◽  
Vol 239-240 ◽  
pp. 1573-1576
Author(s):  
Zhu Qing Gao ◽  
Xiao Dong Cai ◽  
Kai Cheng Ling
Keyword(s):  
Stability Constants ◽  
Tannic Acid ◽  
Ph Value ◽  
Protonation Constants ◽  
Conditional Stability ◽  
Tannin Extract ◽  
Acid Effect ◽  
Different Temperatures ◽  
The Stability ◽  
Apparent Stability

At different temperatures, the protonation constants of tannic acid and the complex apparent stability constants between tannic acid and VO2+ were determined by using pH potentimetric method. The results showed that the protonation constants and the complex apparent stability constants slightly decreased with the raising temperature. In accordance with the pH value in the tannin extract technology, the conditional stability constants of the complex were calculated on the basis of the acid effect of tannic acid and the hydrolysis effect of VO2+. It was found that pH greatly affected the stability constants of the complex , so pH must be strictly controlled in the tannin extract technology.

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