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  • Royal Society of Chemistry (RSC)  (3)
  • Niu, Li  (3)
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  • Royal Society of Chemistry (RSC)  (3)
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  • 1
    Online Resource
    Online Resource
    Inhibition mechanism of melanin formation based on antioxidant scavenging of reactive oxygen species
    Royal Society of Chemistry (RSC) ; 2022
    In:  The Analyst Vol. 147, No. 12 ( 2022), p. 2703-2711
    Details
    In: The Analyst, Royal Society of Chemistry (RSC), Vol. 147, No. 12 ( 2022), p. 2703-2711
    Abstract: The production of reactive oxygen species (ROS) leads to the generation of oxidative stress, which will result in the excessive production and accumulation of melanin in the body and even the occurrence of some skin diseases. The intervention of antioxidants can slow down the rate of melanin formation to some extent. In order to explore the relationship between ROS, melanin and antioxidants, this work investigated the effects of antioxidants on melanin formation by the scavenging of ROS in vitro , where zebrafish were used as the model organism in in vivo experiments. The results showed that the inhibition order of natural antioxidants on melanin formation was GSH 〉 AA 〉 GA and PG 〉 BHT 〉 BHA for synthetic antioxidants. Between natural antioxidants and synthetic antioxidants, the former mainly have a strong scavenging ability on ˙OH and 1 O 2 , while the latter have a strong scavenging ability on O 2 ˙ − . At the same time, the results in vivo showed that GSH and PG within a certain concentration not only did not affect the hatchability, survival rate and teratogenic rate of zebrafish embryos, but also can significantly inhibit melanin formation in zebrafish embryos. The results of this study have an important guiding significance for the dosage of antioxidants used in the cosmetics and food industries.
    Type of Medium: Online Resource
    ISSN: 0003-2654 , 1364-5528
    URL: Article
    DOI: 10.1039/D2AN00588C
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2022
    detail.hit.zdb_id: 1472713-4
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Polydopamine-based molecularly imprinted electrochemical sensor for the highly selective determination of ecstasy components
    Royal Society of Chemistry (RSC) ; 2022
    In:  The Analyst Vol. 147, No. 14 ( 2022), p. 3291-3297
    Details
    In: The Analyst, Royal Society of Chemistry (RSC), Vol. 147, No. 14 ( 2022), p. 3291-3297
    Abstract: 3,4-Methylenedioxyamphetamine (MDA) and 3,4-methylenedioxymethamphetamine (MDMA) are the main components of illicit stimulant drugs, also known as “ecstasy”, which belong to psychoactive medicine and tend to be increasingly abused among drug addicts worldwide. Herein, an electrochemical sensor based on molecularly imprinted polydopamine (MIP@PDA) was developed to detect MDA and MDMA using differential pulse voltammetry (DPV). An MIP film on a Au electrode was synthesized via electrochemical polymerization with the safe chemical DA as the polymerization monomer and the uncontrolled pharmaceutical intermediate 3,4-methylenedioxyphenethylamine (MDPEA) as the template molecule, which can provide a great quantity of specific binding sites and expand the practical application of the sensor. Due to the superior affinity of MIP@PDA to the target, the proposed sensor displayed excellent analytical performance, with LODs of 37 nM and 54 nM for the determination of MDA and MDMA, respectively. Additionally, this sensor presented suitable selectivity, stability, reproducibility and detection ability in practical urine samples, which suggested that it is a promising candidate as a rapid diagnostic method in drug investigations.
    Type of Medium: Online Resource
    ISSN: 0003-2654 , 1364-5528
    URL: Article
    DOI: 10.1039/D2AN00351A
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2022
    detail.hit.zdb_id: 1472713-4
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  • 3
    Online Resource
    Online Resource
    A simple preparation method of in situ oxidized titanium carbide MXene for photocatalytic degradation of catechol
    Royal Society of Chemistry (RSC) ; 2022
    In:  New Journal of Chemistry Vol. 46, No. 19 ( 2022), p. 9364-9371
    Details
    In: New Journal of Chemistry, Royal Society of Chemistry (RSC), Vol. 46, No. 19 ( 2022), p. 9364-9371
    Abstract: Photocatalytic systems have been widely applied to treat the highly toxic and refractory aromatic sewage water pollution problem. However, the development of highly active and excellent durability photocatalysts has always been the long-term challenge for water pollution control. In this work, a kind of MXene (MX) Ti 3 C 2 –TiO 2 composite has been successfully fabricated by in situ oxidation using a simple method. The removal efficiencies of MX-TiO 2 (200) for catechol (CC) were up to 92% under simulated sunlight radiation for 90 min, with a rate constant k of 0.0243 min −1 . Compared with pristine MX Ti 3 C 2 , such a Ti 3 C 2 –TiO 2 composite remarkably accelerated the formation rates of ˙O 2 − and ˙OH due to its metallic nature and large specific surface area, which further accelerates the migration of photogenerated carriers (generated by TiO 2 ) to Ti 3 C 2 . The activity of the MX-TiO 2 (200) did not show noticeable variation after 5-times recycling. A possible Schottky barrier electron transfer mechanism for MX-TiO 2 composite degradation of catechol pollutants was further proposed. The MX-TiO 2 (200) composite developed in this study exhibits great potential as an ideal photocatalyst for application in phenolic pollutant wastewater treatment.
    Type of Medium: Online Resource
    ISSN: 1144-0546 , 1369-9261
    URL: Article
    DOI: 10.1039/D2NJ01033J
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2022
    detail.hit.zdb_id: 1472933-7
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