Faradaic Counter for Liposomes Loaded with Potassium, Sodium Ions, or Protonated Dopamine

The aqueous environment and ionic surrounding are the most important factors determining the conformation of DNA and its functioning in the cell. The specificity of the interaction between DNA and cations is especially pronounced with a decrease in water activity. In this work, we studied the B-A transition in high molecular weight DNA with a decrease of humidity in the film with different contents of Na+ ions using FTIR spectroscopy. The IR spectrum of DNA is not only very sensitive to the state of its secondary structure, but also allows us to estimate the amount of water bound to DNA. Upon dehydration of the DNA film, changes characteristic of the B-A transition were observed in the IR absorption spectrum. Using thermogravimetric analysis, it was shown that the degree of DNA hydration reaches the saturation level at a relative humidity of 60% and decreases slightly upon further drying. It has been established that with increasing Na+ concentration, the amount of water strongly bound to DNA decreases. Along with it, sodium ions destroy the hydration shell of DNA and are able to interact directly with phosphate groups.

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Chromo-ionophoric Properties of para-(5-phthalhydrazide-azo)-phenylene-N-aza-15-crown-5 in the Presence of Lithium and Sodium Ions

Revista de Chimie ◽

10.37358/rc.08.10.1972 ◽

2008 ◽

Vol 59 (10) ◽

Author(s):

Rodica Daniela Baratoiu ◽

Radu Socoteanu ◽

Radu Cristian Mutihac ◽

Anca Elena Barbu ◽

Adrian Beteringhe ◽

...

Keyword(s):

Thin Layer ◽

Thin Layer Chromatography ◽

Reversed Phase ◽

Complex Stability ◽

Sodium Ions ◽

Layer Chromatography

Investigations on the hydrophobic and ionophoric character of para-(5-phthalhydrazide-azo)-phenylene-N-aza-15-crown- (1) were carried out by reversed phase thin layer chromatography (RP-TLC) and spectrophotometric measurements. The study included complexes with Li+ and Na+ cations (as perchlorates in acetonitrile and as dibenzyldithiocarbamate salts in chloroform). In both cases, the stoichiometry of complexes was 1:1:1 (1:M+:anion pair). The complex stability (logKS ) is similar.

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Composition of Apple Juice

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/66.5.1251 ◽

1983 ◽

Vol 66 (5) ◽

pp. 1251-1255 ◽

Cited By ~ 5

Author(s):

Leonard R Mattick ◽

James C Moyer

Keyword(s):

United States ◽

Specific Gravity ◽

Data Base ◽

Apple Juice ◽

The United States ◽

Total Acid ◽

Potassium Sodium ◽

Calcium Iron

Abstract Thirty-one samples from 8 geographic growing regions of the United States and 15 varieties common to these areas were converted to apple juice and analyzed for their attributes over the 3 year period 1979, 1980, and 1981. The total of 93 samples were analyzed for ash, brix, pH, proline, specific gravity, total acid, sorbitol, sucrose, fructose, and glucose. The elements cadmium, calcium, iron, lead, phosphorus, potassium, sodium, and zinc were also determined. These data are presented to serve as a data base for the detection of fraudulent or adulterated apple juice.

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