Quantitative analysis of Roussin red methyl ester in pickled vegetables

Area of Science:

• Environmental Science
• Analytical Chemistry
• Oncology

Background:

• High incidence of esophageal cancer in Linxian County, North China.
• Identification of Roussin red methyl ester in local pickled vegetables.
• Need for quantitative analysis to understand its role.

Purpose of the Study:

• To develop and apply a method for quantifying Roussin red methyl ester in pickled vegetables.
• To compare levels of Roussin red methyl ester in pickled vegetables from high-incidence and low-incidence regions.
• To investigate the potential link between Roussin red methyl ester and esophageal cancer etiology.

Main Methods:

• Gas chromatography-high-resolution mass spectrometry (GC-HRMS) with single-ion monitoring.
• Quantitative analysis of Roussin red methyl ester in pickled vegetable samples.
• Comparative analysis of samples from Linxian County and Beijing.

Main Results:

• Roussin red methyl ester was detected in pickled vegetables from Linxian County at levels of 0.1 to 4.5 mg/kg.
• Levels of Roussin red methyl ester in pickled vegetables from Beijing were below the detection limit (<0.005 mg/kg).
• Significant regional differences in Roussin red methyl ester content were observed.

Conclusions:

• A reliable method for Roussin red methyl ester quantification was established.
• The substantial difference in Roussin red methyl ester levels between Linxian and Beijing may be a contributing factor to the disparity in esophageal cancer incidence.
• Further research is warranted to confirm the etiological role of Roussin red methyl ester in esophageal cancer.