Nanocellulose-Based Passivated-Carbon Quantum Dots (P-CQDs) for Antimicrobial Applications: A Practical Review

Author:

Hindi Sherif S.1,Sabir Jamal S. M.2ORCID,Dawoud Uthman M.3,Ismail Iqbal M.4,Asiry Khalid A.1ORCID,Mirdad Zohair M.1,Abo-Elyousr Kamal A.15ORCID,Shiboob Mohamed H.6ORCID,Gabal Mohamed A.7,Albureikan Mona Othman I.2ORCID,Alanazi Rakan A.1,Ibrahim Omer H. M.1

Affiliation:

1. Department of Agriculture, Faculty of Environmental Sciences, King Abdullaziz University (KAU), P.O. Box 80208, Jeddah 21589, Saudi Arabia

2. Department of Biological Sciences, Faculty of Sciences, King Abdullaziz University (KAU), P.O. Box 80208, Jeddah 21589, Saudi Arabia

3. Department of Chemical and Materials Engineering, King Abdullaziz University (KAU), P.O. Box 80208, Jeddah 21589, Saudi Arabia

4. Department of Chemistry, Faculty of Science, Center of Excellence in Environmental Studies, King Abdullaziz University (KAU), P.O. Box 80208, Jeddah 21589, Saudi Arabia

5. Plant Pathology Department, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt

6. Department of Environment, Faculty of Environmental Sciences, King Abdullaziz University (KAU), P.O. Box 80208, Jeddah 21589, Saudi Arabia

7. Department of Chemistry, Faculty of Science, King Abdullaziz University (KAU), P.O. Box 80208, Jeddah 21589, Saudi Arabia

Abstract

Passivated-carbon quantum dots (P-CQDs) have been attracting great interest as an antimicrobial therapy tool due to their bright fluorescence, lack of toxicity, eco-friendly nature, simple synthetic schemes, and possession of photocatalytic functions comparable to those present in traditional nanometric semiconductors. Besides synthetic precursors, CQDs can be synthesized from a plethora of natural resources including microcrystalline cellulose (MCC) and nanocrystalline cellulose (NCC). Converting MCC into NCC is performed chemically via the top-down route, while synthesizing CODs from NCC can be performed via the bottom-up route. Due to the good surface charge status with the NCC precursor, we focused in this review on synthesizing CQDs from nanocelluloses (MCC and NCC) since they could become a potential source for fabricating carbon quantum dots that are affected by pyrolysis temperature. There are several P-CQDs synthesized with a wide spectrum of featured properties, namely functionalized carbon quantum dots (F-CQDs) and passivated carbon quantum dots (P-CQDs). There are two different important P-CQDs, namely 2,2′-ethylenedioxy-bis-ethylamine (EDA-CQDs) and 3-ethoxypropylamine (EPA-CQDs), that have achieved desirable results in the antiviral therapy field. Since NoV is the most common dangerous cause of nonbacterial, acute gastroenteritis outbreaks worldwide, this review deals with NoV in detail. The surficial charge status (SCS) of the P-CQDs plays an important role in their interactions with NoVs. The EDA-CQDs were found to be more effective than EPA-CQDs in inhibiting the NoV binding. This difference may be attributed to their SCS as well as the virus surface. EDA-CQDs with surficial terminal amino (-NH2) groups are positively charged at physiological pH (-NH3+), whereas EPA-CQDs with surficial terminal methyl groups (-CH3) are not charged. Since the NoV particles are negatively charged, they are attracted to the positively charged EDA-CQDs, resulting in enhancing the P-CQDs concentration around the virus particles. The carbon nanotubes (CNTs) were found to be comparable to the P-CQDs in the non-specific binding with NoV capsid proteins, through complementary charges, π-π stacking, and/or hydrophobic interactions.

Funder

Deanship of Scientific Research (DSR), KAU, Jeddah

Publisher

MDPI AG

Subject

Polymers and Plastics,General Chemistry

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