Effect of Deastringent Conditions on the Removal Ratio of Polyphenols and Flavonoids Content in Wild Hickory Meal
The deastringency treatment of wild hickory meal is an important process.This experiment took the polyphenol removal ratio and flavonoid content as indicators,and used water soaking,NaHCO3 treatment,and NaOH treatment to deastringent wild hickory meal.The results of single factor research showd that the removal of astringency by NaHCO3 treatment was the best.When the astringency removal time was 60 min,the temperature was 60 ℃,the ratio of material to liquid was 1∶20,and the mass fraction was 4％,the highest polyphenol removal rate of wild hickory meal was up to 98.37％.Therefore,NaHCO3 treatment showed better astringency removal effect than water immersion and NaOH treatment,and could effectively reduce the flavonoids content.This study can provide theoretical basis for the deastringency technology of high-quality wild hickory meal and the comprehensive utilization of walnut oil by-products.
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