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Çѱ¹È¯°æ»ý¹°ÇÐȸ / v.25, no.3, 2007³â, pp.260-266
Poly(L-lactide)ºÐÇØ ¼¼±ÕÀÇ ºÐ¸® ¹× Ȱ¼º ÁõÁø
( Isolation of a Poly (L-lactide) Degrading Bacterium and Improvement of its Degradation Capacity )
±è¸»³²;¹Ú»óÅÂ; »ó¸í´ëÇб³ »ý¹°Çаú;»ó¸í´ëÇб³ »ý¹°Çаú;
 
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PLLAºÐÇØÈ°¼ºÀ» °¡Áø °í¿Â¼º¼¼±ÕÀ» ¿ì¸®³ª¶ó °æÀÛÅä·ÎºÎÅÍ ºÐ¸®ÇÏ¿´´Ù. ºÐ¸®µÈ ±ÕÁÖ´Â ±×¶÷¾ç¼º °£±ÕÀ¸·Î 16S rDNA ¿°±â¼­¿­ºÐ¼® °á°ú Geobacillus caldoxylosilyticus·Î µ¿Á¤µÇ¾úÀ¸¸ç, ÇöÀç±îÁö º¸°íµÇÁö ¾ÊÀº »õ·Î¿î PLLAºÐÇØ¼¼±ÕÀ¸·Î ¹àÇôÁ³´Ù. Á¶ÀýÈ­µÈ ÅðºñÈ­Á¶°Ç¿¡¼­ ¸ê±ÕÅðºñ¿¡ ºÐ¸®±ÕÁÖ¸¦ Á¢Á¾Çϰí $58^{circ}C$¿¡¼­ 40Àϰ£ ºÐÇØÈ°¼ºÀ» ÃøÁ¤ÇÏ¿´´Ù. ÀÌ ±ÕÁÖ´Â Áß·®Æò±Õ ºÐÀÚ·®ÀÌ 5000, 11000, 34000 ¹× 256000ÀÎ PLLA5000, PLLA11000, PLLA34000 ¹× PLLA256000¸¦ °¢°¢ 66%, 57%, 41%¹× 40%»ýºÐÇØÇÏ¿´´Ù. PLLA256000À» ±âÁú·Î ÇÏ¿© gelatin, yeast extract ¹× ammonium sulfate¸¦ 0.1%¾¿ ÷°¡ÇÏ¿© ºÐÇØÈ°¼º º¯È­¸¦ Á¶»çÇÑ °á°ú ´ëÁ¶±º¿¡ ºñÇÏ¿© ºÐÇØÈ°¼ºÀÌ °¢°¢ 27%, 13% ¹× 10%ÁõÁøµÇ¾úÀ¸¸ç, Á¢Á¾·®À» $10^9cfu;g^{-1}$·ÎºÎÅÍ $10^{10}cfu;g^{-1}$ ¹× $10^{11}cfu;g^{-1}$·Î Áõ°¡½ÃÅ´¿¡ µû¶ó PLLA256000ÀÇ »ýºÐÇØµµ´Â °¢°¢ 14% ¹× 20% Áõ°¡ÇÏ¿´´Ù.
A thermophilic bacterium capable of poly (L-lactide)(PLLA) degradation was isolated from cultivating soil in Korea. The isolate was Gram positive rod-shaped bacterium, and was identified as Geobacillus caldoxylosilyticus based on the 16S rDNA sequence analysis. The strain proved to be a new PLLA degrading bacterium which has not been reported in the open literatures yet. The degradation activity of the strain was assessed in a sterilized compost inoculated with the strain under controlled compost condition at $58^{circ}C$ for 40 days. The strain mineralized 66%, 57%, 41% and 40% of PLLA5000, PLLA11000, PLLA34000 and PLLA256000 whose weight average molecular weights were 5000, 11000, 34000 and 256000, respectively. Incorporation of 0.1% each of gelatin, yeast extract and ammonium sulfate in the compost containing PLLA256000 as a nutritional supplement raised the biodegradation activity by 27%, 13% and 10%, respectively. Increase of the inoculum size from $10^9cfu;g^{-1};to;10^{10}cfu;g^{-1};and;10^{11}cfu;g^{-1}$ also enhanced the biodegradation activity by 14% and 20%, respectively.
 
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PLLA;biodegradation;Geobacillus caldoxylosilyticus;activator;
 
ȯ°æ»ý¹° / v.25, no.3, 2007³â, pp.260-266
Çѱ¹È¯°æ»ý¹°ÇÐȸ
ISSN : 1226-9999
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200714364034292)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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