title: [Studies on NaNO2-induced DNA mutation by convolution spectrometry].
abstract: OBJECTIVE
  To study the sodium nitrite induced DNA mutation by convolution spectrometry (CS).
  
  
  METHODS
  The spectra of sodium nitrite-induced mutative calf thymus DNA was compared with ego criteria based on Spectra of the primary DNA within the wavelength range from 200 to 340 nm. Distilled water served as blank and normal saline served as negative control. Any difference was quantitatively expressed by differential value (delta) of convolution spectra. Near-infrared spectroscopy was employed as the reference method.
  
  
  RESULTS
  The differential value was positively correlated with the increasing time and concentration of sodium nitrite. delta values increased to 1.37%, 2.41% and 5.44% respectively within 2-hour's reaction between calf thymus DNA and 0.5, 0.05 and 0.005 microgram.mL-1 sodium nitrite, while on the contrary, changes could be hardly observed on the corresponding UV absorption spectra. The results were also confirmed by their corresponding near-infrared spectra.
  
  
  CONCLUSIONS
  The delta values can be used to represent the compound's strength of mutagenesis. Every convolution procedure takes less than one minute, so CS provides a fast, simple and inexpensive alternative method to determine chemical or medicinal DNA mutation.
authors.affiliation: School of Pharmacy, Second Military Medical University, Shanghai 200433, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Lu
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.forename: Yong-bing
authors.initials: YB
authors.lastname: Cao
authors.forename: Yu-tian
authors.initials: YT
authors.lastname: Wu
mesh_terms: D000818:Animals; D002417:Cattle; D004247:DNA / Q000737:chemistry / Q000187:drug effects*; D066298:In Vitro Techniques; D009154:Mutation / Q000187:drug effects*; D012977:Sodium Nitrite / Q000494:pharmacology*; D013057:Spectrum Analysis / Q000379:methods; D013950:Thymus Gland / Q000737:chemistry / Q000187:drug effects*
chemical_list: D004247:DNA; D012977:Sodium Nitrite