Publication: Molecular diagnosis of α-thalassemias by the colorimetric nanogold
Issued Date
2014-01-20
Resource Type
ISSN
13645528
00032654
00032654
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2-s2.0-84892766188
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Mahidol University
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SCOPUS
Bibliographic Citation
Analyst. Vol.139, No.4 (2014), 813-822
Suggested Citation
Sirinart Chomean, Nantawan Wangmaung, Pornpimol Sritongkham, Chamras Promptmas, Sumana Mas-oodi, Dalina Tanyong, Wanida Ittarat Molecular diagnosis of α-thalassemias by the colorimetric nanogold. Analyst. Vol.139, No.4 (2014), 813-822. doi:10.1039/c3an01606d Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/33314
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Title
Molecular diagnosis of α-thalassemias by the colorimetric nanogold
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Abstract
A new application of gold nanoparticles (AuNPs) as a colorimetric method for gene detection of α-thalassemia 1 (SEA deletion) is reported here for the first time. This technique is based on color changes from salt-induced aggregation of un-hybridized nanogold probes after hybridization with the target DNA. Specific DNA probes were synthesized, thiol modified and conjugated on the surface of AuNPs. The target DNA was amplified and hybridized with the AuNPs-immobilized probe. Salt solution (NaCl) was added to induce aggregation of the un-hybridized nanogold probes. The color changes were visualized either by the naked eye or by UV-vis spectrophotometry at 520 nm. By this nanogold colorimetric method samples carrying normal α-globin genes could be successfully identified from samples carrying α-globin genes causing α-thalassemia 1 (SEA deletion), either as a carrier or disease form. Results demonstrated that the new colorimetric nanogold method is a definite gene diagnosis of α-thalassemia. It is accurate, simple, rapid, specific, sensitive, and cost effective. It is also a promising point-of-care testing (POCT) method for thalassemias and other genetic disorders. The new colorimetric nanogold is a method of choice for areas where access to sophisticated molecular diagnosis is limited. © 2014 The Royal Society of Chemistry.