초록
<P><B>Abstract</B></P> <P>Two clean pretreatments, ozonolysis (OZ) and planetary ball milling (BM) were applied separately and in combination to improve the enzymatic hydrolysis of corn straw. Pretreatment of corn straw by OZ and BM alone improved the enzymatic hydrolysis significantly, primarily through delignification and decrystallization of cellulose, respectively. When combined, OZ–BM and BM–OZ pretreatments made the enzymatic hydrolysis more efficient. The glucose and xylose yield of corn straw treated with OZ for 90min followed by BM for 8min (OZ90–BM8) reached to 407.8 and 101.9mg/g-straw, respectively under cellulase loading of 15FPU/g-straw, which was fivefold more than that of untreated straw. Under much lower cellulase loading of 1.5FPU/g-straw, the glucose and xylose yield of treated straw OZ90–BM8 remained at 416.0 and 108.4mg/g-straw, respectively, while the yield of untreated straw decreased. These findings indicate that the combined OZ–BM can be used as a promising pretreatment for corn straw.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Combination of OZ and BM for the more effective pretreatment of corn straw. </LI> <LI> BM after OZ resulted in obviously higher saccharification yield than mere OZ or BM. </LI> <LI> OZ after BM sometimes resulted in higher saccharification yield than mere OZ or BM. </LI> <LI> Cellulase loading for effective hydrolysis decreased after OZ and/or BM treatment. </LI> </UL> </P>