Guan Fang, Pei Yingying, Duan Jizhou, Sand Wolfgang, Zhang Ruiyong, Zhai Xiaofan, Zhang Yimeng, Hou Baorong
Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China; Institute of Marine Corrosion Protection, Guangxi Academy of Sciences, 98 Daling Road, Nanning 530007, China; Research Development Center of Marine Science and Technology, Institute of Oceanology, Chinese Academy of Sciences, Nantong 226019, China.
Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China.
Bioelectrochemistry. 2024 Jun;157:108650. doi: 10.1016/j.bioelechem.2024.108650. Epub 2024 Jan 23.
Microbiologically influenced corrosion (MIC) is a complicated process that happens ubiquitously and quietly in many fields. As a useful nutritional ingredient in microbial culture media, yeast extract (YE) is a routinely added in the MIC field. However, how the YE participated in MIC is not fully clarified. In the present work, the effect of YE on the growth of sulfate reducing prokaryotes (SRP) Desulfovibrio bizertensis SY-1 and corrosion behavior of X70 pipeline steel were studied. It was found that the weight loss of steel coupons in sterile media was doubled when YE was removed from culture media. However, in the SRP assays without YE the number of planktonic cells decreased, but the attachment of bacteria on steel surfaces was enhanced significantly. Besides, the corrosion rate of steel in SRP assays increased fourfold after removing YE from culture media. MIC was not determined for assays with planktonic SRP but only for biofilm assays. The results confirm the effect of YE on D. bizertensis SY-1 growth and also the inhibitory role of YE on MIC.
微生物影响的腐蚀（MIC）是一个复杂的过程，在许多领域普遍且悄然发生。作为微生物培养基中的一种有用营养成分，酵母提取物（YE）在MIC领域是常规添加物。然而，YE如何参与MIC尚未完全阐明。在本研究中，研究了YE对硫酸盐还原原核生物（SRP）比塞特脱硫弧菌SY-1生长以及X70管线钢腐蚀行为的影响。研究发现，当从培养基中去除YE时，无菌培养基中钢试片的失重增加了一倍。然而，在没有YE的SRP试验中，浮游细胞数量减少，但细菌在钢表面的附着显著增强。此外，从培养基中去除YE后，SRP试验中钢的腐蚀速率增加了四倍。对于浮游SRP试验未确定MIC，仅对生物膜试验确定了MIC。结果证实了YE对比塞特脱硫弧菌SY-1生长的影响以及YE对MIC的抑制作用。
