Biorefining of filter tea factory by-products: Classical and ultrasound-assisted extraction of bioactive compounds from wild apple fruit dust

摘要

In this study, two methods of extraction (classical and ultrasound assisted) have been applied to utilize the wild apple fruit dust-by product from a filter tea factory. According to the results obtained, the total phenols content in the wild apple fruit dust ranged from 777.003 to 1,148.030 mg GAE/100 g of investigated material. These results indicate the high potential for utilization of wild apple fruit dust in terms of extraction and production of extracts with a high concentration of phenolic constituents. For optimization of a more efficient method of extraction, in this case ultrasound-assisted, a response surface methodology was applied. Temperature and time interaction proved to be the most dominant and highly significant factor for the extraction of total phenolics from this kind of raw material. On the other hand, linear terms of temperature and the interaction of time and ultrasonic power had a significant effect on the extraction of total flavonoids. The antioxidant activity of the extracts obtained was particularly high: in the range of .0211 to .0279 mg/mL.