Phenolic lipids have been approved as safe and effective antioxidants, are also a potential ingredient for functional foods. However, the characteristics of gastrointestinal distribution and microbial hydrolysis in the gastrointestinal...
Typical crystalline thermoplastic resin polypropylene (PP) and amorphous thermoplastic copolymer acrylonitrile-butadiene-styrene (ABS) were respectively blended with selfmade novel low-melting point thermotropic liquid crystalline polyester (TLCP) that contained phosphorus and nitrogen elements (PN-TLCP). Then, the PP/PN-TLCP and ABS/ PN-TLCP in situ-reinforced composites were prepared. The effects of PN-TLCP on mechanical property, microstructure, processability, and thermal stability of these two composites were investigated. The results showed that the strength and rigidity of matrix were improved, indicating that PN-TLCP played a role of enhancement. Meanwhile, PN-TLCP could form microfibrillar structure in PP and ABS matrix, which was the main reason of the formation of in situ composites. In the forming process, PN-TLCP could induce PP resin to form -crystal, which was why the toughness of PP was improved. In addition, PP and ABS exhibited better processing flowability and their melt flow rates were respectively increased 18% and 56% after blending with PN-TLCP. Besides, PN-TLCP was highly beneficial to improving the thermal stabilities of matrix. Various tests showed that this kind of TLCP was suitable for crystalline thermoplastic resin PP and its composites would have more outstanding comprehensive properties.
Phenolipids such as hydroxytyrosol-SCFA acyl esters (HTy-SEs)
and
tyrosol-SCFA acyl esters (TYr-SEs) with various alkyl chains lengths
(C1–C4) and different isomers (branched-chain and straight-chain)
were successfully synthesized. All esters were hydrolyzed by pancreatic
lipase to produce polyphenols (HTy and TYr) and SCFAs (iso-butyric
acid, acetic acid, propionic acid, and n-butyric acid). Moreover,
HTy-SEs (and TYr-SEs) could also be hydrolyzed to free HTy (and TYr)
and SCFAs by gut microbiota and Lactobacillus from mice feces. Especially, the hydrolysis rates showed positive
correlation with the carbon skeleton length, and the hydrolysis degree
(DH) of ester with a branched-chain fatty acid was weaker than that
of ester with a straight-chain fatty acid. Besides, the DH values
of TYr -SEs were significantly higher than those of HTy-SEs. Therefore,
through regulating the structures of polyphenols, carbon skeleton
lengths, and isomers, controlled-release of polyphenols and SCFAs
from phenolipids will be easily achieved.
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