Concentration and Purity DNA Spectrophotometer: Sodium Monofluorophosphate forensic impended effect

Instability of Sodium Monofluorophosphate in Effervescent Tablets

Sodium monofluorophosphate (MFP, CAS 10163-15-2), widely used as an anti-caries agent and in the prevention or treatment of osteoporosis, is sensitive to moisture and acid. This research presents results of a study of the stability of MFP in tablets from four different pharmaceutical laboratories. With an initial water content of 2.9 to 4.0%, the pH of water solutions of three brands of non-eff...

Determination of DNA Concentration and Purity by Ultraviolet Spectrophotometry

Typically, the first thing one wants to know about a DNA preparation is its concentration and purity. Both can be determined by measuring the absorption of ultraviolet light. DNA absorbs UV more or less strongly depending upon the wavelength. We will be using a NanoDrop spectrophotometer, which takes measurements at wavelengths of 260 and 280 nm, and in addition determines an absorption spectru...

The International Scientific Assembly on the Comparative Anticaries Efficacy of Sodium Fluoride and Sodium Monofluorophosphate Dentifrices.

Effect of dietary sodium reduction on red blood cell sodium concentration and sodium-lithium countertransport.

A randomized, crossover trial was carried out on the effect of moderate sodium reduction on red-blood-cell sodium metabolism. The participants were healthy high school students (mean age = 16 years, n = 33). Changes in sodium-lithium countertransport and intracellular sodium concentration were evaluated 24 days after a decrease in dietary sodium from approximately 110 to 40 mEq per day. Dietary...

The effect of sodium ion concentration on intrastrand base-pairing in single-stranded DNA.

The salt-induced formation of duplex structure (primarily hairpin loops) in denatured calf thymus DNA was monitored by measuring the decrease in absorbance at 260 nm as a function of increasing sodium ion concentration. It was found that this process was noncooperative and could be accurately described by the mass-action expression for the reversible formation of a binary complex: single strand...