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The biogenic nanoprobe displayed marked sensing efficiency in the presence of Pb ions over concentration ranges from 5 to 100 \u03bcM with limits of detection of around 2.45 \u03bcM. Performance optimization studies revealed that the maximum fluorescence quenching efficiency was obtained in the presence of [ZnS NPs] at 4 mg\/ml, and alkaline pH of 10 recorded under stable ambient temperature for approximately 5 min for the quenching process. Advanced morphological analysis indicated that the bio\u2010sensing mechanism was essentially a surface\u2010based phenomenon in which the Pb ions were in very close proximity to the QDs and formed stable ground\u2010state Pb\u2013ZnS complexes, resulting in a quenched fluorescence of the QDs. Simultaneously, a larger fraction of Pb ions interacted via collisions with the excited ZnS QDs and resulted in an effective energy transfer from the excited QDs to the Pb ions, therefore resulting in an obvious decrease in QD fluorescence. These insights were well supported by theoretical analysis using Stern\u2013Volmer plots and sphere\u2010of\u2010action models.<\/jats:p>","DOI":"10.1002\/bio.3895","type":"journal-article","created":{"date-parts":[[2020,6,8]],"date-time":"2020-06-08T10:59:10Z","timestamp":1591613950000},"page":"1328-1337","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Biologically synthesized ZnS quantum dots as fluorescent probes for lead (II) sensing"],"prefix":"10.1002","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1051-2344","authenticated-orcid":false,"given":"Jaya Mary","family":"Jacob","sequence":"first","affiliation":[{"name":"Department of Biotechnology &amp; Biochemical Engineering Sree Buddha College of Engineering  Pattoor, Alappuzha Kerala India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Reju","family":"Rajan","sequence":"additional","affiliation":[{"name":"Department of Biotechnology &amp; Biochemical Engineering Sree Buddha College of Engineering  Pattoor, Alappuzha Kerala India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gayathri G.","family":"Kurup","sequence":"additional","affiliation":[{"name":"Department of Biotechnology &amp; Biochemical Engineering Sree Buddha College of Engineering  Pattoor, Alappuzha Kerala India"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2020,7,10]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s13201-019-0946-4"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00128-018-2492-4"},{"key":"e_1_2_6_4_1","doi-asserted-by":"crossref","unstructured":"C.Li P.Lu S.Lin A AW\u2010J of P and P 2019 undefined.A turn\u2010on dansyl\u2010based fluorescent chemosensor for the recognition of Pb2+. 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