Quality Characteristics of Dolsan Leaf Mustard according to Various Blanching Conditions and Liquid Chromatography with Photodiode Array and Tandem Mass Spectrometry Analysis

Abstract

This study aims to examine the optimum blanching conditions as a pretreatment condition to improve the storage stability of Dolsan leaf mustard pickle. The effects of the blan-ching temperature and time were investigated at a temperature range of 80-100 o C. Sampling was done for 1 month after a 5 days interval. The L value of the Dolsan leaf mustard was found to be the highest at 80 o C. The cutting force increased as the blanching temperature increased. The tensile strength decreased at 95 o C and 100 o C. In addition, the sensory evaluation scores were the best at 80 o C. The storage stability was assessed at various blanching temperatures to increase the sinigrin content during storage. Liquid chromatography with photodiode array and tandem mass spectrometry (LC-PDA/MS/MS) analysis was conducted to identify and quantify the sinigrin content in the Dolsan leaf mustard. Sinigrin as an internal standard was co-injected into each sample solution. The sample was monitored by recording the ultraviolet absorbance at 228 nm and by electrospray ionization (ESI) positive ion mode in the m/z 50-1,500 range. Blanching the sample at 80 o C showed the highest sinigrin concentration during storage among various temperatures and the maximum concentration was 350 ppm at 15 days storage. Study on utilization of vegetable from food processing of leaf mustard and preservation conservation results suggest that blanching at 80 o C is expected to improve the palatability of the pickle.