公开(公告)号：US5801034A

公开(公告)日：1998-09-01

申请号：US356042

申请日：1994-12-14

申请人： Virgil B. Lawlis, Jr. ,  Henry G. Heinsohn ,  Enrique F. Baliu

发明人： Virgil B. Lawlis, Jr. ,  Henry G. Heinsohn ,  Enrique F. Baliu

IPC分类号： C12N1/00 ,  C12N9/00 ,  C12P21/00

CPC分类号： C12N1/005 ,  Y10S435/814 ,  Y10S435/911 ,  Y10S435/917 ,  Y10S435/942 ,  Y10S530/823 ,  Y10S530/824

摘要： This invention provides a method for killing cells in fermentation mixtures in order to prepare the fermentation mixture for processing to recover or extract a desired product from the fermentation mixture. A preferred method of this invention comprises in either order, adjusting the pH of the fermentation mixture to a value equal to or less than about two pH units below the pK.sub.a of the compatible organic acid using a mineral acid, and adding a sufficient amount of a compatible organic acid and/or organic acid salt to the mixture to effect a substantially complete cell kill. The method of this invention is useful for killing microorganisms such as yeast, bacteria or fungi in any culture or fermentation mixture and is particularly useful in systems where it is desired to kill the cells without lysing them.

摘要翻译： 本发明提供了一种杀死发酵混合物中的细胞的方法，以便制备用于从发酵混合物中回收或提取所需产物的加工的发酵混合物。 本发明的优选方法包括以下任一顺序：使用无机酸将发酵混合物的pH调节至等于或小于相容有机酸的pKa的约两个pH单位的值，并加入足量的 相容的有机酸和/或有机酸盐，以实现基本上完全的细胞杀灭。 本发明的方法可用于在任何培养物或发酵混合物中杀死微生物如酵母，细菌或真菌，并且特别适用于希望在不裂解细胞的情况下杀死细胞的系统。

公开(公告)号：US5378621A

公开(公告)日：1995-01-03

申请号：US57851

申请日：1993-05-07

申请人： Virgil B. Lawlis, Jr. ,  Henry G. Heinsohn ,  Enrique F. Baliu

发明人： Virgil B. Lawlis, Jr. ,  Henry G. Heinsohn ,  Enrique F. Baliu

IPC分类号： C12N1/00 ,  C12N1/36 ,  C12P1/00 ,  C12N9/00 ,  C12P21/00

CPC分类号： C12N1/005 ,  Y10S435/814 ,  Y10S435/911 ,  Y10S435/917 ,  Y10S435/942 ,  Y10S530/823 ,  Y10S530/824

摘要： This invention provides a method for killing fungal cells without lysing in fermentation processes in order to prepare the fermentation mixture for processing to recover or extract an extracellularly expressed enzyme from the fermentation mixture. A preferred method of this invention comprises adjusting the pH of the fermentation mixture to less than 2.79 using a mineral acid, then adding sufficient acetic acid to the mixture to affect a substantially complete cell kill in mixture. A salt of the acetic acid can be used. The organic acid or salt can be added, then the pH adjusted to the desired level. Other organic acids can be used, in which case the pH of the mixture is adjusted to the pK.sub.a of the selected organic acid before the organic acid is added to the mixture. The method of this invention is useful for stopping the growth and killing the cells in any micro-organism, culture or fermentation such as those containing yeast, bacteria or fungi and is particularly useful in systems where it is desired to kill the cells without lysing them.

摘要翻译： 本发明提供了一种杀死真菌细胞而不在发酵过程中裂解的方法，以便制备用于从发酵混合物中回收或提取细胞外表达的酶的发酵混合物。 本发明的优选方法包括使用无机酸将发酵混合物的pH调节至小于2.79，然后向混合物中加入足够的乙酸以影响混合物中基本上完全的细胞杀灭。 可以使用乙酸的盐。 可以加入有机酸或盐，然后将pH调节至所需水平。 可以使用其它有机酸，在这种情况下，在将有机酸加入到混合物中之前，将混合物的pH调节至所选有机酸的pKa。 本发明的方法可用于阻止生长和杀死任何微生物，培养或发酵中的细胞，例如含有酵母，细菌或真菌的细胞，并且特别适用于希望在不裂解细胞的情况下杀死细胞的系统 。