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Bhosle AA, Banerjee M, Hiremath SD, Sisodiya DS, Naik VG, Barooah N, Bhasikuttan AC, Chattopadhyay A, Chatterjee A. A combination of a graphene quantum dots-cationic red dye donor-acceptor pair and cucurbit[7]uril as a supramolecular sensor for ultrasensitive detection of cancer biomarkers spermine and spermidine. J Mater Chem B 2022; 10:8258-8273. [PMID: 36134699 DOI: 10.1039/d2tb01269c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In a unique approach, the combination of a donor-acceptor pair of hydroxy graphene quantum dots (GQDs-OH) and a red-emissive donor-two-acceptor (D-2-A) type dye with pyridinium units (BPBP) and the well-known host cucurbit[7]uril (CB[7]) has been exploited as a supramolecular sensing assembly for the detection of cancer biomarkers spermine and spermidine in aqueous media at the sub-ppb level based on the affinity-driven exchange of guests from the CB[7] portal. In the binary conjugate, green fluorescent GQDs-OH transfers energy to trigger the emission of the dye BPBP and itself remains in the turn-off state. CB[7] withdraws the dye from the surface of GQDs-OH by strong host-guest interactions with its portal, making GQDs-OH fluoresce again to produce a ratiometric response. In the presence of spermine (SP) or spermidine (SPD), their strong affinity with CB[7] forces the ejection of the fluorophore to settle on the GQDs-OH surface, and the strong green emission of GQDs-OH turns off to device a supramolecular sensor for the detection of SP/SPD. The DFT studies revealed interesting excited-state charge-transfer conjugate formation between BPBP and GQDs leading to turn-on emission of the dye, and further supported the stronger binding modes of BPBP-CB[7], indicating the retrieval of the emission of GQDs. The assembly-disassembly based sensing mechanism was also established by Job's plot analysis, particle size analysis, zeta potential, time-resolved spectroscopy, ITC studies, microscopic studies, etc. The supramolecular sensing assembly is highly selective to SP and SPD, and showed nominal interference from other biogenic amines, amino acids, various metal ions, and anions. The limits of detection (LODs) were 0.1 ppb and 0.9 ppb for spermine and spermidine, respectively. The potential for the real-world application of this sensing assembly was demonstrated by spiking SP and SPD in human urine and blood serum with a high %recovery.
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Affiliation(s)
- Akhil A Bhosle
- Department of Chemistry, BITS Pilani, K. K. Birla Goa Campus, NH 17B Bypass Road, Zuarinagar, Goa 403726, India.
| | - Mainak Banerjee
- Department of Chemistry, BITS Pilani, K. K. Birla Goa Campus, NH 17B Bypass Road, Zuarinagar, Goa 403726, India.
| | - Sharanabasava D Hiremath
- Department of Chemistry, BITS Pilani, K. K. Birla Goa Campus, NH 17B Bypass Road, Zuarinagar, Goa 403726, India.
| | - Dilawar S Sisodiya
- Department of Chemistry, BITS Pilani, K. K. Birla Goa Campus, NH 17B Bypass Road, Zuarinagar, Goa 403726, India.
| | - Viraj G Naik
- Department of Chemistry, BITS Pilani, K. K. Birla Goa Campus, NH 17B Bypass Road, Zuarinagar, Goa 403726, India.
| | - Nilotpal Barooah
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
| | - Achikanath C Bhasikuttan
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.,Homi Bhabha National Institute, Anushaktinagar, Mumbai, India
| | - Anjan Chattopadhyay
- Department of Chemistry, BITS Pilani, K. K. Birla Goa Campus, NH 17B Bypass Road, Zuarinagar, Goa 403726, India.
| | - Amrita Chatterjee
- Department of Chemistry, BITS Pilani, K. K. Birla Goa Campus, NH 17B Bypass Road, Zuarinagar, Goa 403726, India.
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