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    • 6. 发明公开
    • CLA biosynthesis by bifidobacteria
    • 生物合成
    • EP1264893A1
    • 2002-12-11
    • EP01113962.3
    • 2001-06-08
    • Teagasc Dairy Products Research Centre
    • The designation of the inventor has not yet been filed
    • C12P7/64A61K35/74A23L1/03A23K1/00
    • C12P7/6427A23K10/18A23L29/065A23V2002/00A23Y2300/59C12P7/6472A23V2250/1866
    • Nineteen strains of Lactobacillus , 2 strains of Lactococcus , 1 strain of Pediococcus, 4 strains of Propionibacterium and 23 strains of Bifidobacterium were screened for their ability to produce conjugated linoleic acid (CLA) from linoleic acid. Of these, 7 strains of Bifidobacterium , as well as 2 strains of Propionibacterium produced the cis-9, trans -11 CLA isomer from linoleic acid. In contrast, strains of Lactobacillus, Lactococcus and Pediococcus lacked the ability to synthesise CLA. CLA ( cis -9, trans- 11 isomer) production by the genus Bifidobacterium was shown to exhibit considerable interspecies variation, with B . breve and B . dentium being the most efficient producers among the strains tested, yielding up to 65 % conversion of linoleic acid to CLA at linoleic acid concentrations of 0.2-1.0 mg/ml in MRS medium. The growth of B. breve strains was inhibited by increasing concentrations of linoleic acid. Viability of B. breve 2257 was unaffected in the presence of up to 0.5 mg/ml linoleic acid for 48 h but was dramatically reduced to 1.5% survival at 1 mg/ml linoleic acid. However, viability of the B . breve strains NCFB2258, NCTC 11815, NCIMB 8815 and NCIMB 8807 was reduced to
    • 从亚油酸中筛选出19株乳酸杆菌,2株乳杆菌属,1株菌种,4种丙酸杆菌和23株双歧杆菌,产生共轭亚油酸(CLA)的能力。 其中7种双歧杆菌以及2种丙酸杆菌从亚油酸产生顺式-9,反式-11 CLA异构体。 相比之下,乳酸杆菌,乳球菌和小球菌的菌株缺乏合成CLA的能力。 显示双歧杆菌属的CLA(顺式-9,反式-11异构体)产生显示出相当大的种间变异,B. breve和B. dentium是所测试菌株中最有效的生产者,产生高达65%的亚油酸转化 在MRS培养基中亚油酸浓度为0.2-1.0mg / ml的CLA对CLA的影响。 通过增加亚油酸的浓度来抑制短双歧杆菌菌株的生长。 在高达0.5mg / ml亚油酸存在下,短双歧杆菌2257的活力不受影响48小时,但在1mg / ml亚油酸下显着降低至1.5%存活。 然而,短链子短杆菌NCFB2258,NCTC 11815,NCIMB 8815和NCIMB 8807的活力在亚油酸浓度为0.2mg / ml时降低至<60%。 这些数据表明,某些双歧杆菌菌株可能有提高食物中CLA含量和CLA在人体内的应用。