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¡¾ÕªÒª¡¿  ÒÔù·ÓËá²úÉú¾ú1321#Ϊ³ö·¢¾úÖ꣬²ÉÓÃ×ÏÍâÏßÓձ䲢¸´ºÏÖØ½ðÊôCr6+¡¢Cu2+¿¹ÐÔÖêɸѡ£¬»ñµÃÒ»ÖêÒÅ´«ÐÔ×´Îȶ¨ÇÒÒ¡Æ¿·¢½ÍˮƽÌá¸ß86.6%µÄ164#¸ß²ú¾úÖê¡£¾­·¢½ÍÅä·½ÓÅ»¯£¬¸Ã¾úÖêµÄÒ¡Æ¿µ¥Î»ÔÙ¶ÈÌáÉýÁË5.5%£¬ÏÔʾ³öÁ˸߲úDZÁ¦¡£

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    ABSTRACT  A mycophenoilc acid (MPA) producing strain Penicillium brevicompactum #1321 was treated by UV, followed by resistance selection with heavy metal Cr6+ and Cu2+. A stable strain #164 was obtained with the potency of MPA higher by 86.6% than starting strain in shaking culture. The potency was further improved by 5.5% in the optimized fermentation medium.

    KEY WORDS  Mycophenoilc acid;  Mutagenesis;  Heavy metal ion;  Resistant screening

     Ã¹·ÓËá(mycophenoilc acid£¬MPA)Ϊ¶ÌÃÜÇàù(Penicillium brevicompactum)²úÉúµÄ¿¹Õæ¾ú¡¢¿¹Ö×Áö²¢¾ßÃâÒßÒÖÖÆ×÷ÓõĿ¹ÉúËØ£Û1£Ý¡£MPAÊǴλÆàÑßʵ¥ºËÜÕËáÍÑÇâøµÄ¿ÉÄæÐÔÒÖÖÆ¼Á£¬ÄÜÑ¡ÔñÐÔµØÒÖÖÆÁܰÍϸ°û»îÐÔ£¬ËüµÄ2-ÒÒ»ùõ¥ÀàÑÜÉúÎ¡ªÃ¹·ÓËáõ¥(MMF)ÊÇÐÂÒ»´úÃâÒßÒÖÖÆ¼Á£¬ÔÚÁÙ´²Æ÷¹ÙÒÆÖ²ºÍ×ÔÉíÃâÒßÐÔ¼²²¡µÄÖÎÁÆ·½ÃæÕ¹Ê¾ÁËÁ¼ºÃµÄÓ¦ÓÃǰ¾°¡£×öΪºÏ³ÉMMFµÄǰÌ廯ºÏÎÌá¸ßMPAµÄ¹¤Òµ»¯Ë®Æ½¶ÔÓÚÉú²úÆóÒµÀ´ËµÊ®·ÖÖØÒª¡£

    MPA²úÉú¾úԭʼ¾úÖêµÄ²úÁ¿ÓÐÏÞ£¬Æä¸ß²ú¾úÖêµÄÑ¡ÓýÑо¿½üÄêÀ´½¥³ÉÈȵ㡣ÕÅÇٵȣÛ2£Ý±¨µÀ²ÉÓÃ×ÏÍâÏß¼°ÑÇÏõ»ùëÒÓÕ±ä²úÉú¾ú£¬ÒÔMPAºÍÈý·úÒÒËáΪ¿¹ÐÔɸѡ±ê¼Ç£¬É¸Ñ¡µ½Á˸߲úÍ»±äÖꣻÑîÑÇÓµȣÛ3£Ý±¨µÀ×ÏÍâÏߺÍÑÇÏõËḴºÏÓÕ±äMPA²úÉú¾úµÄÔ­ÉúÖÊÌ壬¾­Ô­ÉúÖÊÌåÔÙÉú»ñµÃÁ˸߲ú¾úÖê¡£±¾Îı¨µÀÁËÓ¦ÓÃ×ÏÍâÓÕ±äÓ붨ÏòÉ¸Ñ¡ÖØ½ðÊôÀë×Ó¿¹ÐÔÖêÏà½áºÏµÄ·½Ê½£¬½øÐÐMPAÓýÖÖÑо¿£¬²¢»ñµÃÁ˸߲úÎȶ¨µÄÍ»±äÖê¡£

    1  ²ÄÁÏÓë·½·¨

    1.1  ³ö·¢¾úÖÖ

    ¶ÌÃÜÇàù(Penicillium brevicompactum)1321#¡£

    1.2  ÅàÑø»ù¼°ÅàÑøÌõ¼þ

    (1)·ÖÀë¼°Ð±ÃæÅàÑø  ÂíÁåÊíÆÏÌÑÌÇÇíÖ¬(PDA)ÅàÑø»ù£¬26¡æÅàÑø5d¡«7d¡£

    (2)ÖÖ×ÓÅàÑø  µí·Û10g£¬ÆÏÌÑÌÇ5g£¬½Íĸ·Û3g£¬ÂÈ»¯ÄÆ1g£¬ÁòËáþ0.5g£¬Ì¼Ëá¸Æ1g£¬×ÔÀ´Ë®1000ml£¬×ÔÈ»pH¡£26¡æ£¬220r/minÒ¡´²£¬ÅàÑø2d¡£

    (3)·¢½ÍÅàÑø  µí·Û12g£¬ÕáÌÇ50g£¬ÓñÃ×½¬50g£¬Óã·Ûµ°°×ëË2g£¬½Íĸ·Û13g£¬ÁòËáï§4g£¬Á×Ëá¶þÇâ¼Ø1g£¬ÂÈ»¯¸Æ2g£¬Ì¼Ëá¸Æ0.5g£¬×ÔÀ´Ë®1000ml£¬×ÔÈ»pH¡£26¡æ£¬220r/minÒ¡´²£¬ÅàÑø7d¡£

    1.3  ¾úÖÖÓÕ±äÓëɸѡ

    (1)×ÏÍâÕÕÉäµ¥Òò×Ó´¦Àí  Óɳö·¢¾úÖêµÄ³ÉÊìÐ±ÃæÖÆµÃµ¥æß×ÓÐüÒºÖÃÆ½ÃóÖУ¬×ÏÍâµÆ(30W£¬²¨³¤254nm£¬ ¾àÀë40cm)ÕÕÉä4¡«5min£¬ æß×ÓÒºÊʵ±Ï¡ÊͺóÍ¿²¼ÓÚPDAƽ°åÅàÑø»ùÉÏ¡£ÅàÑø5dºóÌôÈ¡µ¥¾úÂä½øÐÐҡƿɸѡ¡£

    (2)×ÏÍâÕÕÉ临ºÏCr6+¡¢Cu2+ƽ°å¿¹ÐÔ´¦Àí  ÖÆ±¸º¬ÓÐ0.6%¡¢0.7%ºÍ0.8%¸õËáÄÆÒÔ¼°0.02%¡¢0.05%ºÍ0.1%ÁòËáÍ­µÄPDAƽ°å£¬½«UV´¦Àí¹ýµÄæß×ÓÒºÊʵ±Ï¡ÊͲ¢Í¿²¼ÓÚº¬Cr6+¡¢Cu2+ƽ°åÅàÑø»ùÉÏ£¬ÅàÑø5d¡«7dºóÌôÑ¡æß×ӷḻ¡¢¾úÂäÖ±¾¶Ïà¶Ô½Ï´óµÄ¿¹ÐÔ¾úÂä½øÐÐҡƿɸѡ¡£

    1.4  ·¢½ÍÒºµ¥Î»¼ì²â

    ÑùÆ·´¦Àí  ¶¨Á¿ÎüÈ¡·¢½ÍÒº£¬¼ÓÈë1.5±¶µÄÎÞË®ÒÒ´¼£¬³ä·ÖÕñµ´1h£¬3000r/minÀëÐÄ10min¡£È¡ÉÏÇåÒºÓÉHPLC²âЧ¼Û¡£

    HPLC²â¶¨  É«Æ×ÖùAgilent Extend-C18(4.6mm¡Á250mm)£»Á÷¶¯ÏàΪ¼×´¼¡Ã0.1%´×Ëá(70¡Ã30)£»¼ì²â²¨³¤250nm£»ÖùÎÂ40¡æ¡£

    MPA¶ÔÕÕÆ·ÎªSigma¹«Ë¾²úÆ·¡£

2  ½á¹û

    2.1  ¾úÖÖÓÕ±äϵÆ×

    2.2  Ò¡Æ¿É¸Ñ¡½á¹û

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    Óɱí1¿É¼û£¬UV+Na2CrO4¸´ºÏ´¦Àíɸѡµ½µÄ942#¾úÖêµÄ²úÁ¿Ìá¸ß·ù¶È×î´ó£¬Ëæºó½øÐеÄUV+CuSO4¸´ºÏ´¦ÀíµÃµ½µÄ164#¾úÖêÆä·¢½Íµ¥Î»½øÒ»²½ÌáÉý¡£

    2.3  ¸ß²úÍ»±äÖêµÄ¾úÂäÐÎ̬±ä»¯

    164#¸ß²úÍ»±äÖêµÄ¾úÂäÐÎ̬Óëԭʼ¾úÖê1321#Ïà±ÈÓÐÁ˽ϴó±ä»¯¡£1321#ΪԲÐÎ±âÆ½×´¾úÂ䣬¶ø164#µÄ¾úÂäÖÐÑë͹Æð£¬³Ê¶Ô³ÆÐÔ·ÅÉäñÞÖå×´¡£ÇÒÓÐÖ±¾¶±äС¡¢æß×ÓÁ¿¼õÉÙµÄÇ÷ÊÆ¡£±í1    ÈýÖÖÓÕ±äɸѡ·½Ê½»ñµÃÕý±äÖê(ϵÆ×¾úÖê)µÄÏà¶ÔÒ¡Æ¿²úÁ¿ÒÔ³ö·¢¾úÖêCK1321#Ò¡Æ¿²úÁ¿Îª100%¼Æ¡£2.4  ¸ß²ú¾úÖêÒÅ´«Îȶ¨ÐÔ¿¼²ì

    164#¾úÖê¾­Á¬ÐøËÄ´ÎÐ±Ãæ´«´úºóÓëF1´ú½øÐÐÒ¡Æ¿·¢½Íµ¥Î»µÄ±È½Ï£¬Æä×Ó´úЧ¼ÛÓëF1´ú»ù±¾³Öƽ¡£Ö¤Ã÷¸Ã¾úÖêµÄÒÅ´«Îȶ¨ÐÔÁ¼ºÃ¡£

    2.5  ·¢½ÍÅä·½ÓÅ»¯

    ÒÔ164#×öΪÊÔÑé¾úÖ꣬¶Ô·¢½ÍÅàÑø»ùÖеĵí·Û¡¢ÕáÌÇ¡¢½Íĸ·Û¡¢Óã·Ûµ°°×ëË¡¢ÓñÃ×½¬½øÐÐU15(155)¾ùÔÈÉè¼ÆÊÔÑé¡£¾­ÑéÖ¤£¬Åä·½ÓÅ»¯ºó164#¾úÖêµÄÒ¡Æ¿µ¥Î»Ìá¸ßÁË5.5%¡£

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