A composite carbon-based solid acid-supported palladium catalyst (Pd/C-SO₃H) for hydrogenolysis of plant-derived polymeric proanthocyanidins

Abstract

A composite catalyst, Pd/C-SO3H, has been prepared to depolymerize plant-derived polymeric proanthocyanidins (PPC).

Simple, green, ultrasound-assisted preparation of novel core–shell microcapsules from octyl methoxycinnamate and oligomeric proanthocyanidins for UV-stable sunscreen

“…The 1 H NMR spectra of OPCs and proanthocyanidins B1 show peaks at 1.9 ppm, 2.5–3.3 ppm, 3.6–4.4 ppm, 4.6–5.0 ppm, 5.7–6.0 ppm, 6.7 ppm, 7.7–8 ppm and 8.8–9.2 ppm. 53 The spectrum of OPC is similar to those of proanthocyanidins B1, showing that the structure of the extracted product are similar to those of proanthocyanidin B1.…”

“…The residue was vacuum dried at (45 AE 5 C) to provide larch bark OPCs as a powder. 53,54 Preparation of OMC/OPCs composite microcapsules OMC/OPCs composite microcapsules were prepared using ultrasound. OPCs (0.2 g) were dissolved in ultrapure water (10 mL) by stirring at room temperature for 24 h. The solution was ltered through a 0.45 mm aqueous phase lter membrane and treated with different amounts of OMC and surfactants (APG1214 or Tween 80), as described below, to give a mixed emulsion.…”

Protective Effect of Composite Hydrogel Based on Hydroxypropyl Trimethylammonium Chloride Chitosan on Skin Photodamage

“…CAT could accelerate the decomposition rate of hydrogen peroxide and improve antioxidant activity. The CAT content in N-2-HACC/HA/EA/PC group was higher than N-2-HACC/HA/EA group, indicating that the presence of PC had an inhibitory effect on CAT …”

“…In addition, the hydrogen supply capacity of PC and EA increased with the decrease of pH, and the stable free radical formation ability decreased with the decrease of pH. These two influencing factors offset each other, resulting in the highest free radical scavenging ability around pH 5. , …”

“…The CAT content in N-2-HACC/HA/ EA/PC group was higher than N-2-HACC/HA/EA group, indicating that the presence of PC had an inhibitory effect on CAT. 56 As shown in Figure 7d, the content of GSH-Px in MC was significantly lower than in NC (P < 0.005), indicating that UVB could induce the decreased expression of GSH-Px activity. Compared with the model group, the enzyme activity in the VC group was increased, the contents of CAT and GSH-Px in N-2-HACC/HA/EA and N-2-HACC/HA/EA/PC groups were increased, and the enzyme activity of antioxidant enzymes was significantly increased compared with VC group (P < 0.005).…”