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Spectrophotometric determination of yeast RNA with neutral red

Author(s): Xueliang Niu | Weili Zhang | Shan Lin | Wei Sun

Journal: Bulletin of the Chemical Society of Ethiopia
ISSN 1011-3924

Volume: 22;
Issue: 3;
Start page: 441;
Date: 2008;
Original page

Keywords: Neutral red | Yeast RNA | Interaction | UV-Vis spectrophotometry

The interaction of neutral red (NR) with yeast RNA (yRNA) was studied by UV-Vis spectrophotometry to develop a simple spectrophotometric method for the determination yRNA. NR exhibited a maximum absorption peak at 528 nm in a Britton-Robinson (B-R) buffer solution of pH 4.0. After the addition of yRNA into NR solution, the absorbance value was greatly decreased and no new absorption peaks appeared. The interaction conditions such as the buffer pH, reaction time, etc. were carefully studied. Under the optimal conditions the decrease in absorbance value was proportional to the yRNA concentration in the range from 0.2 to 20.0 mg L-1 when 8.0 × 10-5 M NR was employed. The detection limit was calculated as 0.78 mg L-1 (3σ) and three synthetic samples were determined satisfactorily. A binding ratio of NR to yRNA was found to be 1:1 by the molar ratio method.
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