3.3. Total polyphenol content
The total polyphenol content in control and ginger oleoresin samples obtained with enzyme treatment is presented in Table 2. Extraction of ginger with ethanol resulted in higher extraction of polyphenols (33 mg/g) compared to conventional acetone extraction (31 mg/g). Pre-treatment of ginger with cellulase followed by extraction with ethanol afforded the resin with maximum amount of polyphenols (37.5 mg/g). Pre-treatment of ginger with pectinase, amylase and viscozyme followed by extraction with ethanol gave resins with polyphenols in the range of 33–34.2%. Higher content of polyphenols in the resin could be an advantage because of the health benefits of polyphenols.