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  • Frontiers Media SA  (2)
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  • Frontiers Media SA  (2)
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  • 1
    Online Resource
    Online Resource
    DataSheet1.docx
    Frontiers Media SA ; 2022
    In:  Frontiers in Chemistry Vol. 10 ( 2022-9-21)
    Details
    In: Frontiers in Chemistry, Frontiers Media SA, Vol. 10 ( 2022-9-21)
    Abstract: The selective hydrogenolysis of glycerol to 1,3-propanediol (1,3-PDO) with high added value is attraction but challenging. Pt-WO x -based catalysts have been extensively studied in the selective hydrogenolysis of glycerol. The catalyst support and the physicochemical state of WO x play important roles on this reaction. In this paper, Pt-WO x catalysts supported on TiO 2 with different crystal forms were prepared and studied for their catalytic performance in hydrogenolysis of glycerol. It was observed that the catalytic performance of anatase-type (A-type) TiO 2 -supported catalyst (Pt/W/A-Ti) is much better than that of the rutile-type (R-type) TiO 2 catalyst (Pt/W/R-Ti) due to its higher stability. Furthermore, the influence of W loading amount and state were thoroughly investigated for the Pt/W/A-Ti catalysts, and Pt/W/A-TiO 2 with 5 wt% loading of WO x achieved the best catalytic performance (100% conversion of glycerol and 41% yield of 1,3-PDO under the optimal reaction conditions), owing to the suitable WO x domains and high dispersion of W species, as evidenced by XRD patterns and TEM images. Mechanism study by in-situ DRIFTS experiments indicated that glycerol was first converted to 3-hydroxypropanal and then converted to 1,3-PDO through subsequent reactions.
    Type of Medium: Online Resource
    ISSN: 2296-2646
    URL: Article
    URL: Article
    DOI: 10.3389/fchem.2022.1004925
    DOI: 10.3389/fchem.2022.1004925.s001
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2711776-5
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  • 2
    Online Resource
    Online Resource
    Solamargine Alleviated UVB-Induced Inflammation and Melanogenesis in Human Keratinocytes and Melanocytes via the p38 MAPK Signaling Pathway, a Promising Agent for Post-inflammatory Hyperpigmentation
    Frontiers Media SA ; 2022
    In:  Frontiers in Medicine Vol. 9 ( 2022-6-13)
    Details
    In: Frontiers in Medicine, Frontiers Media SA, Vol. 9 ( 2022-6-13)
    Abstract: Post-inflammatory hyperpigmentation (PIH) is a common acquired pigmentary disorder occurring after skin inflammation or injury. Ultraviolet B irradiation could exaggerate PIH clinically due to its effect on promoting cutaneous inflammation and melanogenesis in keratinocytes and melanocytes, respectively. Solamargine (SM), a steroidal alkaloid glycoside extracted from Solanum undatum , significantly inhibits Ultraviolet B (UVB)-induced pro-inflammatory cytokines IL-1α, IL-1β, IL-8, and IFN-γ, as well as paracrine melanogenic factors ET-1, α-MSH, and bFGF in human keratinocytes. Additionally, SM significantly attenuated UVB-induced melanin synthesis in human epidermal melanocytes through down-regulation of tyrosinase activity and expression of MITF, TRP-1, TRP-2, and tyrosinase. SM exerted an anti-inflammatory effect in UVB-irradiated keratinocytes through the p38 MAPK/Nrf2/HO-1 signaling pathway. With its anti-inflammatory and whitening effect, SM may improve PIH through paracrine regulations of keratinocytes and direct action on melanocytes, making it a promising agent for PIH.
    Type of Medium: Online Resource
    ISSN: 2296-858X
    URL: Article
    DOI: 10.3389/fmed.2022.812653
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2775999-4
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