The mutagenesis of nattokinase-producing strains, the construction of expression systems, and molecular modification have been used to improve the stability of nattokinase and reduce the difficulty of purification. Optimization of fermentation conditions, the enhancement of isolation and purification methods, and the use of encapsulation and immobilization techniques have been used https://riveruciou.gigswiki.com/5186387/alles_über_nattokinase_2000_fu