Contents determination of Vitamin C,Nitrate,Nitrite in varied Zingiber officinale

In order to determine the contents of Vitamin C,Nitrate,and Nitrite in varied Zingiber officinale and evaluate the quality of Zingiber officinale,ultraviolet spectrophotometer is used to measure the absorbency of Zingiber officinale at special wavelength.The final result points out that VitC content was 111.4 mg/kg in fresh Zingiber officinale and the VitC content was 23.0 mg/kg in cooked Zingiber officinale.But VitC was 58.6 mg/kg in pickled Zingiber officinale;the Nitrate content was 393385.0 mg/kg in fresh Zingiber officinale,2350.2 mg/kg in cooked Zingiber officinale,and 1042.2 mg/kg in pickled Zingiber officinale;and the content of Nitrite was 3.046 mg/kg in fresh Zingiber officinale,0.780 mg/kg in cooked Zingiber officinale,and 1.347 mg/kg in pickled Zingiber officinale.