Article(id=1315696201543046086, tenantId=1146029695717560320, journalId=1315121759093096577, issueId=1315696195121558078, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1005-7021.2026.04.006, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1772640000000, receivedDateStr=2026-03-05, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1791616018901, onlineDateStr=2026-10-10, pubDate=1787155200000, pubDateStr=2026-08-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1791616018901, onlineIssueDateStr=2026-10-10, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1791616018901, creator=13701087609, updateTime=1791616018901, updator=13701087609, issue=Issue{id=1315696195121558078, tenantId=1146029695717560320, journalId=1315121759093096577, year='2026', volume='46', issue='4', pageStart='1', pageEnd='144', issueExtLink='null', onlineDate='null', pubDate='1787155200000', pubDateStr='2026-08-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1791616017369, creator='13701087609', updateTime=1791616161314, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1315696798950339227, tenantId=1146029695717560320, journalId=1315121759093096577, issueId=1315696195121558078, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1315696798950339228, tenantId=1146029695717560320, journalId=1315121759093096577, issueId=1315696195121558078, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=64, endPage=75, ext={EN=ArticleExt(id=1315696201748566983, articleId=1315696201543046086, tenantId=1146029695717560320, journalId=1315121759093096577, language=EN, title=Study on Isolation, Identification and Degradation Efficiency of Mesophilic Polylactic Acid-Degrading Bacteria (Raoultella ornithinolytica) in the Yalu River Basin, columnId=null, journalTitle=Journal of Microbiology, columnName=null, runingTitle=null, highlight=null, articleAbstract=

Polylactic acid (PLA) is widely recognized as one of the most promising biodegradable polymers for replacing conventional petroleum-based plastics. Although PLA is theoretically fully biodegradable, its practical environmental performance is often compromised by slow degradation rates, which may result in secondary pollution. This limitation is largely attributable to the low abundance and restricted distribution of efficient PLA-degrading microorganisms in natural ecosystems. In this study, a PLA-degrading bacterial strain designated as Raoultella ornithinolytica LD-PLA-01was screened, isolated, and identified from soils samples collected in the Yalu River Basin. The PLA degradation performance of this strain was systematically evaluated. Under mesophilic conditions (30 ℃), strain LD-PLA-01 achieved a mass loss of 14.61% in PLA films within 30 days. Scanning electron microscope (SEM), water contact angle (WCA), and Fourier transform infrared (FTIR) spectroscopy analyses of the degraded PLA films revealed pronounced surface erosion, including depressions and cracks. FTIR spectra indicated hydrolytic cleavage of ester bonds (C-O) on the polymer surface, which was accompanied by a marked increase in surface hydrophilicity. Furthermore, lactic acid monomers and low-molecular-weight oligomers were detected among the degradation products. These results demonstrate that R. ornithinolytica LD-PLA-01 strain exhibits considerable potential for PLA biodegradation and may serve as a promising candidate for the biological treatment and environmental management of PLA-based plastic waste.

, authors=Yu-jun WANG^{1, 2, *}, Yuan-yi ZHANG¹, Le-hui ZHAO³, Wen-zhong AN¹, Ying-wei LV⁴, Jun YOU¹, Yi-ning MA¹, Si-qi MENG¹, authorsList=Yu-jun WANG, Yuan-yi ZHANG, Le-hui ZHAO, Wen-zhong AN, Ying-wei LV, Jun YOU, Yi-ning MA, Si-qi MENG, authorCompany=null, correspAuthors=Yu-jun WANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1315696201975059400, articleId=1315696201543046086, tenantId=1146029695717560320, journalId=1315121759093096577, language=CN, title=鸭绿江流域中温聚乳酸降解细菌（Raoultella ornithinolytica）的分离鉴定及其降解效能研究, columnId=1315696197449405326, journalTitle=微生物学杂志, columnName=研究报告, runingTitle=null, highlight=null, articleAbstract=

聚乳酸（Polylactic Acid, PLA）被认为是替代传统石油来源塑料极具潜力的生物降解材料。理论上PLA可完全生物降解，但在实际应用中仍存在因降解缓慢而造成环境污染的可能性，这与自然环境中PLA降解微生物的分布较少直接相关。本研究从鸭绿江流域土壤中分离、鉴定出一株PLA降解菌株解鸟氨酸拉乌尔菌（Raoultella ornithinolytica）LD-PLA-01，并对其降解能力进行系统评估。该菌株在中温条件下（30 ℃）30 d内可使PLA薄膜失重14.61%。经扫描电子显微镜（SEM）、水接触角（WCA）测量仪、傅里叶变换红外光谱仪（ATR-FTIR）检测该菌株降解后的PLA膜发现，膜表面出现了凹陷和裂痕，膜表面的酯键（C-O）被水解，导致膜表面亲水性增大。并在PLA的降解产物中检测到乳酸单体及其低聚物。菌株R. ornithinolytica LD-PLA-01在PLA降解方面具有潜在的应用价值，未来可应用于PLA废弃物的生物处理。

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王玉俊　男，讲师，博士。主要研究方向为塑料生物降解。E-mail: wangyujun2011@163.com

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王玉俊　男，讲师，博士。主要研究方向为塑料生物降解。E-mail: wangyujun2011@163.com

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