High sensitive fluorophotometric determination of nucleic acids with Pyronine G sensitized by N,N-dimethylformamide.
In Tris-HCl buffer (pH 8.0), the fluorescence of Pyronine G emitted at 552 nm was quenched by nucleic acids when excited at 525 nm. Adding N, N-dimethylformamide (DMF) as a sensitive media can enhance the sensitivity greatly. Based on the fluorescence reactions sensitive fluorimetric methods for nucleic acids at nanogram levels were proposed. Under the optimum conditions, the calibration curves were linear in the range of 0.0032 - 2.5 microg mL(-1) for ct DNA and 0.0024 - 2.5 microg mL(-1) for hs DNA. The limits of determination were 3.2 ng mL(-1) and 2.4 ng mL(-1) respectively. This method has good selectivity and high sensitivity. It has been applied to the determination of DNA in the synthetic samples and real samples with satisfactory results.
Wei
Qin
Q
School of Chemistry and Chemical Engineering, Jinan University, Jinan 250022, P R China. sdjndxwq@263.net
Zhang
Hui
H
Duan
Caihong
C
Li
Yan
Y
Du
Bin
B
D000818:Animals; D002417:Cattle; D004247:DNA / Q000032:analysis / Q000737:chemistry; D004126:Dimethylformamide / Q000737:chemistry*; D005399:Fishes; D005453:Fluorescence; D006863:Hydrogen-Ion Concentration; D009696:Nucleic Acids / Q000032:analysis* / Q000737:chemistry; D009994:Osmolar Concentration; D011754:Pyronine / Q000032:analysis* / Q000737:chemistry; D012313:RNA / Q000032:analysis / Q000737:chemistry; D012680:Sensitivity and Specificity; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods*; D015003:Yeasts / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
D009696:Nucleic Acids; D012997:Solvents; D012313:RNA; D004126:Dimethylformamide; D004247:DNA; C427203:calf thymus DNA; D011754:Pyronine