Stefan-van Staden RI, Bogea IM, Ilie-Mihai RM, Gheorghe DC, Coroş M, Pruneanu SM. Stochastic microsensors based on modified graphene for pattern recognition of maspin in biological samples.
Anal Bioanal Chem 2022;
414:3667-3673. [PMID:
35266021 DOI:
10.1007/s00216-022-04007-5]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 02/10/2022] [Accepted: 03/03/2022] [Indexed: 11/01/2022]
Abstract
Maspin is a novel serine protease inhibitor differentially expressed in several types of human cancers. It proved to be a key biomarker in the assessment of gastric cancer. Therefore, we design, characterize, and validate two stochastic microsensors based on graphene co-doped with N and S, and modified with α-cyclodextrin and maltodextrin, for the pattern recognition and quantification of maspin in whole blood, gastric tumor tissue, saliva, and urine. While the sensitivities were comparable with magnitude order, the variations were in the wideness of the linear concentration range, when measurements were performed at a pH of 7.40. Very low limits of quantification were recorded at both working pHs: 7.40, and 3.00. High recoveries of maspin in whole blood, gastric tissue tumor, saliva, and urine were also recorded.
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