First experiments with carbon black pigment dispersion acting as a Janus ultrasound contrast agent
Background: Theranostic ultrasound contrast agents comprise a therapeutic component whose controlled release is triggered by an ultrasound pulse. However, once the therapeutic component has been released from an ultrasound contrast agent microbubble, its intended uptake cannot be monitored, as its a...
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| Format: | Article |
| Language: | English |
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Compuscript Ltd
2023-08-01
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| Series: | BIO Integration |
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| Online Access: | https://www.ingentaconnect.com/contentone/cscript/bioi/2023/00000004/00000002/art00006 |
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| author | Jean de Bruin Jordaan Ken J. Nixon Craig S. Carlson Michiel Postema |
| author_facet | Jean de Bruin Jordaan Ken J. Nixon Craig S. Carlson Michiel Postema |
| author_sort | Jean de Bruin Jordaan |
| collection | DOAJ |
| description | Background: Theranostic ultrasound contrast agents comprise a therapeutic component whose controlled release is triggered by an ultrasound pulse. However, once the therapeutic component has been released from an ultrasound contrast agent microbubble, its intended uptake cannot be monitored, as its acoustically active host has been destroyed. Acoustic Janus particles, whose hydrophobic and hydrophilic properties depend on the external acoustic regime, are of potential use as contrast agents and drug-delivery tracers. The purpose of this study was to evaluate the hypothesis that submicron particles with Janus properties may act as ultrasound contrast agents whose hydrophobicity changes over time. Methods: Fifty samples of carbon black were subjected to 5-minute sonication with pulses with a center frequency of 10 MHz and a 1% duty cycle, after which the optical absorption coefficients were measured in n-octanol and water. These coefficients were compared with those of unsonicated samples. Results: Our preliminary results show that the difference between the linear absorption coefficients of sonicated and unsonicated samples was Δα = 80 ± 13 m−1 immediately after sonication, indicating that the carbon black particles were less hydrophobic after sonication than prior to it. Forty-eight hours after sonication, the difference in linear optical absorption coefficients had lessened to Δα = 16 ± 9 m−1, indicating that the carbon black particles had become more hydrophobic over time, but not equal to the hydrophobicity situation prior to sonication. Conclusion: The experiments confirmed that submicron carbon black particles have acoustic Janus properties. |
| first_indexed | 2024-03-12T02:02:41Z |
| format | Article |
| id | doaj.art-e422cec012d3477a988e83fdaa8d58b3 |
| institution | Directory Open Access Journal |
| issn | 2712-0082 |
| language | English |
| last_indexed | 2024-03-12T02:02:41Z |
| publishDate | 2023-08-01 |
| publisher | Compuscript Ltd |
| record_format | Article |
| series | BIO Integration |
| spelling | doaj.art-e422cec012d3477a988e83fdaa8d58b32023-09-07T11:41:41ZengCompuscript LtdBIO Integration2712-00822023-08-0142738010.15212/bioi-2023-0004First experiments with carbon black pigment dispersion acting as a Janus ultrasound contrast agentJean de Bruin Jordaan0Ken J. Nixon1Craig S. Carlson2Michiel Postema3School of Electrical and Information Engineering, University of the Witwatersrand, Johannesburg 2050, South AfricaSchool of Electrical and Information Engineering, University of the Witwatersrand, Johannesburg 2050, South AfricaSchool of Electrical and Information Engineering, University of the Witwatersrand, Johannesburg 2050, South AfricaSchool of Electrical and Information Engineering, University of the Witwatersrand, Johannesburg 2050, South AfricaBackground: Theranostic ultrasound contrast agents comprise a therapeutic component whose controlled release is triggered by an ultrasound pulse. However, once the therapeutic component has been released from an ultrasound contrast agent microbubble, its intended uptake cannot be monitored, as its acoustically active host has been destroyed. Acoustic Janus particles, whose hydrophobic and hydrophilic properties depend on the external acoustic regime, are of potential use as contrast agents and drug-delivery tracers. The purpose of this study was to evaluate the hypothesis that submicron particles with Janus properties may act as ultrasound contrast agents whose hydrophobicity changes over time. Methods: Fifty samples of carbon black were subjected to 5-minute sonication with pulses with a center frequency of 10 MHz and a 1% duty cycle, after which the optical absorption coefficients were measured in n-octanol and water. These coefficients were compared with those of unsonicated samples. Results: Our preliminary results show that the difference between the linear absorption coefficients of sonicated and unsonicated samples was Δα = 80 ± 13 m−1 immediately after sonication, indicating that the carbon black particles were less hydrophobic after sonication than prior to it. Forty-eight hours after sonication, the difference in linear optical absorption coefficients had lessened to Δα = 16 ± 9 m−1, indicating that the carbon black particles had become more hydrophobic over time, but not equal to the hydrophobicity situation prior to sonication. Conclusion: The experiments confirmed that submicron carbon black particles have acoustic Janus properties.https://www.ingentaconnect.com/contentone/cscript/bioi/2023/00000004/00000002/art00006acoustic janus particleshydrophobic contrast agentoptical absorption coefficientsubmicron carbon blacktransient hydrophilicity |
| spellingShingle | Jean de Bruin Jordaan Ken J. Nixon Craig S. Carlson Michiel Postema First experiments with carbon black pigment dispersion acting as a Janus ultrasound contrast agent BIO Integration acoustic janus particles hydrophobic contrast agent optical absorption coefficient submicron carbon black transient hydrophilicity |
| title | First experiments with carbon black pigment dispersion acting as a Janus ultrasound contrast agent |
| title_full | First experiments with carbon black pigment dispersion acting as a Janus ultrasound contrast agent |
| title_fullStr | First experiments with carbon black pigment dispersion acting as a Janus ultrasound contrast agent |
| title_full_unstemmed | First experiments with carbon black pigment dispersion acting as a Janus ultrasound contrast agent |
| title_short | First experiments with carbon black pigment dispersion acting as a Janus ultrasound contrast agent |
| title_sort | first experiments with carbon black pigment dispersion acting as a janus ultrasound contrast agent |
| topic | acoustic janus particles hydrophobic contrast agent optical absorption coefficient submicron carbon black transient hydrophilicity |
| url | https://www.ingentaconnect.com/contentone/cscript/bioi/2023/00000004/00000002/art00006 |
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