The synthesis of amino-functionalized carbon quantum dots-decorated hydroxyapatite as drug delivery agent

The synthesis of amino-functionalized carbon quantum dots-decorated hydroxyapatite as drug delivery agent

Hydroxyapatite (HAp) was combined with amino-functionalized carbon quantum dots (CQDs) to enhance the optical and surface area properties of HAp. The loading of amino-functionalized CQDs could enhance the luminescence of HAp and its UV–Vis absorbance. Additionally, surface area of HAp could be incre...

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Published in:Comptes rendus. Chimie Vol. 25; no. G1; pp. 295 - 306
Main Authors: Hui, Khee Chung, Dhanapalan, Nagaammai, Khayrani, Apriliana Cahya, Imanto, Teguh, Sambudi, Nonni Soraya
Format: Journal Article
Language:English
Published: Académie des sciences 01-01-2022
Subjects:
Acetaminophen
Carbon quantum dots
Chitosan
Drug delivery
Hydroxyapatite
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Abstract Hydroxyapatite (HAp) was combined with amino-functionalized carbon quantum dots (CQDs) to enhance the optical and surface area properties of HAp. The loading of amino-functionalized CQDs could enhance the luminescence of HAp and its UV–Vis absorbance. Additionally, surface area of HAp could be increased from 84.16 to 129.94 m$^{2}$/g by loading amino-functionalized CQDs. The drug release experiment was conducted using acetaminophen. The release happened slowly for amino-functionalized CQDs/HAp, with full release of acetaminophen being observed after 24 h. The enhanced luminescence composite shows high potential for the composite to be used for the controlled release of drugs.
AbstractList Hydroxyapatite (HAp) was combined with amino-functionalized carbon quantum dots (CQDs) to enhance the optical and surface area properties of HAp. The loading of amino-functionalized CQDs could enhance the luminescence of HAp and its UV–Vis absorbance. Additionally, surface area of HAp could be increased from 84.16 to 129.94 m$^{2}$/g by loading amino-functionalized CQDs. The drug release experiment was conducted using acetaminophen. The release happened slowly for amino-functionalized CQDs/HAp, with full release of acetaminophen being observed after 24 h. The enhanced luminescence composite shows high potential for the composite to be used for the controlled release of drugs.
Author Sambudi, Nonni Soraya
Khayrani, Apriliana Cahya
Dhanapalan, Nagaammai
Imanto, Teguh
Hui, Khee Chung
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CitedBy_id crossref_primary_10_1016_j_partic_2023_09_012
crossref_primary_10_1016_j_physb_2024_416006
Cites_doi 10.1016/j.drudis.2018.01.006
10.1016/j.mseb.2015.02.014
10.1016/j.jconrel.2020.08.012
10.1016/j.jphotobiol.2021.112201
10.1080/03639045.2020.1776321
10.1039/C6TB03184F
10.1007/s00339-017-1356-9
10.1016/j.carbon.2016.07.017
10.1016/j.msec.2020.111829
10.1016/j.polymertesting.2021.107270
10.1186/s12951-018-0392-8
10.1007/s42235-019-0026-3
10.1021/acsomega.8b00650
10.5802/crchim.58
10.1016/j.jconrel.2015.10.005
10.1021/acsami.8b02792
10.1039/C9CP06529F
10.1016/j.pmatsci.2019.100591
10.1016/j.ceramint.2015.01.033
10.3390/ma14216522
10.1007/s10973-019-08255-z
10.1080/17425247.2021.1862792
10.14233/ajchem.2013.F32
10.1002/wnan.1504
10.1016/j.carbpol.2017.11.091
10.1039/C6RA06759J
10.1039/C6NR05983J
10.1016/j.saa.2013.10.027
10.1016/j.biopha.2020.110834
10.1080/10667857.2021.1879529
10.1380/ejssnt.2019.61
10.1007/s13762-014-0514-2
10.1016/j.apsusc.2019.144862
10.1007/s10971-019-05141-w
10.1038/s41573-020-0090-8
10.1016/j.matlet.2016.03.140
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References Ghiasi, B. (key2023112215334173575_5) 2020; 46
Sheikh, L. (key2023112215334173575_34) 2016; 6
Murakami, R. (key2023112215334173575_32) 2019; 17
Paduraru, A. V. (key2023112215334173575_28) 2021; 11
García Domínguez, G. (key2023112215334173575_22) 2021; 14
Gheisari, H. (key2023112215334173575_23) 2015; 41
Bandow, S. (key2023112215334173575_39) 2017; 123
Uskoković, V. (key2023112215334173575_33) 2020; 22
Daulbayev, C. (key2023112215334173575_20) 2021; 24
Chang, Q. (key2023112215334173575_21) 2020; 508
Song, J. (key2023112215334173575_16) 2018; 8
Ma, B. (key2023112215334173575_7) 2017; 9
Yun, Y. (key2023112215334173575_2) 2015; 219
Nair, A. (key2023112215334173575_10) 2020; 132
Roman-Lopez, J. (key2023112215334173575_27) 2014; 120
Dong, J. (key2023112215334173575_42) 2021; 18
Irfan, M. (key2023112215334173575_14) 2022; 37
Jiang, D. L. (key2023112215334173575_15) 2017; 5
Mitchell, M. J. (key2023112215334173575_4) 2021; 20
Romero, L. (key2023112215334173575_25) 2018; 17
Yamamoto, S. (key2023112215334173575_35) 2008; 20
Kim, Y. (key2023112215334173575_36) 2013; 25
Sarkar, C. (key2023112215334173575_13) 2018; 181
Chang, Q. (key2023112215334173575_24) 2016; 175
Patra, J. K. (key2023112215334173575_1) 2018; 16
Türk, S. (key2023112215334173575_19) 2019; 16
Hellgren, N. (key2023112215334173575_38) 2016; 108
Sun, L. (key2023112215334173575_17) 2021; 251
György, S. (key2023112215334173575_26) 2019; 138
Liu, X. (key2023112215334173575_18) 2016; 6
Türk, S. (key2023112215334173575_44) 2021; 121
Leonetti, B. (key2023112215334173575_41) 2021; 61
Mishra, V. (key2023112215334173575_9) 2018; 23
Chatterjee, S. (key2023112215334173575_31) 2018; 3
Khajuria, D. K. (key2023112215334173575_11) 2018; 10
Chen, Y. (key2023112215334173575_12) 2021; 219
Zainal Abidin, N. H. (key2023112215334173575_30) 2021; 100
Yang, H. (key2023112215334173575_40) 2015; 12
Chung, H. K. (key2023112215334173575_8) 2020; 93
Zhao, C. (key2023112215334173575_43) 2020; 18
Mondal, S. (key2023112215334173575_6) 2018; 10
Thang, C. (key2023112215334173575_29) 2015; 197
Greczynski, G. (key2023112215334173575_37) 2020; 107
Moradi Kashkooli, F. (key2023112215334173575_3) 2020; 327
References_xml – volume: 23
  start-page: 1219
  year: 2018
  ident: key2023112215334173575_9
  publication-title: Drug Discov. Today
  doi: 10.1016/j.drudis.2018.01.006
  contributor:
    fullname: Mishra, V.
– volume: 197
  start-page: 18
  year: 2015
  ident: key2023112215334173575_29
  publication-title: Mater. Sci. Eng. B
  doi: 10.1016/j.mseb.2015.02.014
  contributor:
    fullname: Thang, C.
– volume: 327
  start-page: 316
  year: 2020
  ident: key2023112215334173575_3
  publication-title: J. Control. Release
  doi: 10.1016/j.jconrel.2020.08.012
  contributor:
    fullname: Moradi Kashkooli, F.
– volume: 219
  year: 2021
  ident: key2023112215334173575_12
  publication-title: J. Photochem. Photobiol. B, Biol.
  doi: 10.1016/j.jphotobiol.2021.112201
  contributor:
    fullname: Chen, Y.
– volume: 46
  start-page: 1035
  year: 2020
  ident: key2023112215334173575_5
  publication-title: Drug Dev. Ind. Pharm.
  doi: 10.1080/03639045.2020.1776321
  contributor:
    fullname: Ghiasi, B.
– volume: 5
  start-page: 3749
  year: 2017
  ident: key2023112215334173575_15
  publication-title: J. Mater. Chem. B
  doi: 10.1039/C6TB03184F
  contributor:
    fullname: Jiang, D. L.
– volume: 17
  start-page: 1
  year: 2018
  ident: key2023112215334173575_25
  publication-title: J. Appl. Biomater. Fund. Mater.
  contributor:
    fullname: Romero, L.
– volume: 123
  year: 2017
  ident: key2023112215334173575_39
  publication-title: Appl. Phys. A
  doi: 10.1007/s00339-017-1356-9
  contributor:
    fullname: Bandow, S.
– volume: 108
  start-page: 242
  year: 2016
  ident: key2023112215334173575_38
  publication-title: Carbon
  doi: 10.1016/j.carbon.2016.07.017
  contributor:
    fullname: Hellgren, N.
– volume: 121
  year: 2021
  ident: key2023112215334173575_44
  publication-title: Mater. Sci. Eng. C
  doi: 10.1016/j.msec.2020.111829
  contributor:
    fullname: Türk, S.
– volume: 11
  year: 2021
  ident: key2023112215334173575_28
  publication-title: Nanomaterials
  contributor:
    fullname: Paduraru, A. V.
– volume: 100
  year: 2021
  ident: key2023112215334173575_30
  publication-title: Polym. Test.
  doi: 10.1016/j.polymertesting.2021.107270
  contributor:
    fullname: Zainal Abidin, N. H.
– volume: 20
  year: 2008
  ident: key2023112215334173575_35
  publication-title: J. Phys. Condens. Matter
  contributor:
    fullname: Yamamoto, S.
– volume: 16
  year: 2018
  ident: key2023112215334173575_1
  publication-title: J. Nanobiotechnol.
  doi: 10.1186/s12951-018-0392-8
  contributor:
    fullname: Patra, J. K.
– volume: 16
  start-page: 311
  year: 2019
  ident: key2023112215334173575_19
  publication-title: J. Bionic Eng.
  doi: 10.1007/s42235-019-0026-3
  contributor:
    fullname: Türk, S.
– volume: 3
  start-page: 11486
  year: 2018
  ident: key2023112215334173575_31
  publication-title: ACS Omega
  doi: 10.1021/acsomega.8b00650
  contributor:
    fullname: Chatterjee, S.
– volume: 8
  year: 2018
  ident: key2023112215334173575_16
  publication-title: Nanomaterials (Basel)
  contributor:
    fullname: Song, J.
– volume: 251
  year: 2021
  ident: key2023112215334173575_17
  publication-title: Spectrochim. Acta A Mol. Biomol. Spectrosc.
  contributor:
    fullname: Sun, L.
– volume: 24
  start-page: 1
  year: 2021
  ident: key2023112215334173575_20
  publication-title: C. R. Chim.
  doi: 10.5802/crchim.58
  contributor:
    fullname: Daulbayev, C.
– volume: 219
  start-page: 2
  year: 2015
  ident: key2023112215334173575_2
  publication-title: J. Control. Release
  doi: 10.1016/j.jconrel.2015.10.005
  contributor:
    fullname: Yun, Y.
– volume: 10
  start-page: 19373
  year: 2018
  ident: key2023112215334173575_11
  publication-title: ACS Appl. Mater. Interfaces
  doi: 10.1021/acsami.8b02792
  contributor:
    fullname: Khajuria, D. K.
– volume: 22
  start-page: 5531
  year: 2020
  ident: key2023112215334173575_33
  publication-title: Phys. Chem. Chem. Phys.
  doi: 10.1039/C9CP06529F
  contributor:
    fullname: Uskoković, V.
– volume: 107
  year: 2020
  ident: key2023112215334173575_37
  publication-title: Prog. Mater. Sci.
  doi: 10.1016/j.pmatsci.2019.100591
  contributor:
    fullname: Greczynski, G.
– volume: 41
  start-page: 5967
  year: 2015
  ident: key2023112215334173575_23
  publication-title: Ceram. Int.
  doi: 10.1016/j.ceramint.2015.01.033
  contributor:
    fullname: Gheisari, H.
– volume: 61
  year: 2021
  ident: key2023112215334173575_41
  publication-title: J. Drug Deliv. Sci. Technol.
  contributor:
    fullname: Leonetti, B.
– volume: 14
  year: 2021
  ident: key2023112215334173575_22
  publication-title: Materials (Basel)
  doi: 10.3390/ma14216522
  contributor:
    fullname: García Domínguez, G.
– volume: 138
  start-page: 145
  year: 2019
  ident: key2023112215334173575_26
  publication-title: J. Therm. Anal. Calorim.
  doi: 10.1007/s10973-019-08255-z
  contributor:
    fullname: György, S.
– volume: 6
  year: 2016
  ident: key2023112215334173575_18
  publication-title: Sci. Rep.
  contributor:
    fullname: Liu, X.
– volume: 18
  start-page: 695
  year: 2021
  ident: key2023112215334173575_42
  publication-title: Expert Opin. Drug Deliv.
  doi: 10.1080/17425247.2021.1862792
  contributor:
    fullname: Dong, J.
– volume: 25
  start-page: 5277
  year: 2013
  ident: key2023112215334173575_36
  publication-title: Asian J. Chem.
  doi: 10.14233/ajchem.2013.F32
  contributor:
    fullname: Kim, Y.
– volume: 10
  year: 2018
  ident: key2023112215334173575_6
  publication-title: WIREs Nanomed. Nanobiotechnol.
  doi: 10.1002/wnan.1504
  contributor:
    fullname: Mondal, S.
– volume: 181
  start-page: 710
  year: 2018
  ident: key2023112215334173575_13
  publication-title: Carbohydr. Polym.
  doi: 10.1016/j.carbpol.2017.11.091
  contributor:
    fullname: Sarkar, C.
– volume: 6
  start-page: 62556
  year: 2016
  ident: key2023112215334173575_34
  publication-title: RSC Adv.
  doi: 10.1039/C6RA06759J
  contributor:
    fullname: Sheikh, L.
– volume: 9
  start-page: 2162
  year: 2017
  ident: key2023112215334173575_7
  publication-title: Nanoscale
  doi: 10.1039/C6NR05983J
  contributor:
    fullname: Ma, B.
– volume: 120
  start-page: 610
  year: 2014
  ident: key2023112215334173575_27
  publication-title: Spectrochim. Acta A Mol. Biomol. Spectrosc.
  doi: 10.1016/j.saa.2013.10.027
  contributor:
    fullname: Roman-Lopez, J.
– volume: 132
  year: 2020
  ident: key2023112215334173575_10
  publication-title: Biomed. Pharmacother.
  doi: 10.1016/j.biopha.2020.110834
  contributor:
    fullname: Nair, A.
– volume: 37
  start-page: 768
  year: 2022
  ident: key2023112215334173575_14
  publication-title: Mater. Technol.
  doi: 10.1080/10667857.2021.1879529
  contributor:
    fullname: Irfan, M.
– volume: 17
  start-page: 61
  year: 2019
  ident: key2023112215334173575_32
  publication-title: e-J. Surf. Sci. Nanotechnol.
  doi: 10.1380/ejssnt.2019.61
  contributor:
    fullname: Murakami, R.
– volume: 12
  start-page: 1173
  year: 2015
  ident: key2023112215334173575_40
  publication-title: Int. J. Environ. Sci. Technol.
  doi: 10.1007/s13762-014-0514-2
  contributor:
    fullname: Yang, H.
– volume: 508
  year: 2020
  ident: key2023112215334173575_21
  publication-title: Appl. Surf. Sci.
  doi: 10.1016/j.apsusc.2019.144862
  contributor:
    fullname: Chang, Q.
– volume: 18
  year: 2020
  ident: key2023112215334173575_43
  publication-title: J. Nanobiotechnol.
  contributor:
    fullname: Zhao, C.
– volume: 93
  start-page: 214
  year: 2020
  ident: key2023112215334173575_8
  publication-title: J. Sol-Gel Sci. Technol.
  doi: 10.1007/s10971-019-05141-w
  contributor:
    fullname: Chung, H. K.
– volume: 20
  start-page: 101
  year: 2021
  ident: key2023112215334173575_4
  publication-title: Nat. Rev. Drug Discov.
  doi: 10.1038/s41573-020-0090-8
  contributor:
    fullname: Mitchell, M. J.
– volume: 175
  start-page: 44
  year: 2016
  ident: key2023112215334173575_24
  publication-title: Mater. Lett.
  doi: 10.1016/j.matlet.2016.03.140
  contributor:
    fullname: Chang, Q.
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Snippet Hydroxyapatite (HAp) was combined with amino-functionalized carbon quantum dots (CQDs) to enhance the optical and surface area properties of HAp. The loading...
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SubjectTerms Acetaminophen
Carbon quantum dots
Chitosan
Drug delivery
Hydroxyapatite
Title The synthesis of amino-functionalized carbon quantum dots-decorated hydroxyapatite as drug delivery agent
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