Evaluation of bactericidal effects of chlorogenic or hydroxycinnamic acid derivatives and soluble coffee under low pH or gastric acid conditions

2021 ◽  
Vol 27 (2) ◽  
pp. 301-310
Author(s):  
Juri Igarashi ◽  
Aoi Inoue ◽  
Hiroko Ueno ◽  
Satomi Tsutsuura ◽  
Kyoko Noda ◽  
...  
Keyword(s):  
Gastric Acid ◽  
Low Ph ◽  
Hydroxycinnamic Acid ◽  
Bactericidal Effects ◽  
Hydroxycinnamic Acid Derivatives ◽  
Soluble Coffee

Flavonoids and UV Photoprotection in Arabidopsis Mutants

2001 ◽  
Vol 56 (9-10) ◽  
pp. 745-754 ◽  
Author(s):  
Ken G Ryan ◽  
Ewald E Swinny ◽  
Chris Winefield ◽  
Kenneth R Markham
Keyword(s):  
Crucial Role ◽  
Hydroxycinnamic Acid ◽  
Ultraviolet B ◽  
Uvb Radiation ◽  
Wild Type ◽  
Hydroxycinnamic Acid Derivatives ◽  
Quercetin Glycosides ◽  
Kaempferol Glycosides ◽  
Low Levels ◽  
High Level

AbstractWild-type Arabidopsis L. leaves exposed to low ultraviolet-B (U V B ) conditions contained predominantly kaempferol glycosides, with low levels of quercetin glycosides. The flavonoid level doubled on treatment with UVB and an increase in the ratio of quercetin: kaempferol was observed. These results suggest that flavonols protect Arabidopsis plants from UVB damage, and indicate that the flavonoid 3’-hydroxylase (F3’H) enzyme, which converts dihydrokaempferol to dihydroquercetin, may play a crucial role. The tt7 mutant lacks this gene and, after treatment with sub-ambient UVB, contained kaempferol glycosides exclusively, to a level of total flavonols similar to that in wild-type Arabidopsis. Total flavonols after enhanced UVB treatment were higher in tt7 than in similarly treated wild-type plants, and only kaempferol glycosides were detected. Despite this high level, tt7 plants were less tolerant of UVB radiation than wild-type plants. These observations suggests that kaempferol is a less effective photoprotectant than quercetin. The chalcone isomerase (CHI) mutant (tt5) surprisingly did not accumulate naringenin chalcone, and this suggests that the mutation may not be restricted to the CHI gene alone. The concentration of hydroxycinnamic acid derivatives did not change with UVB treatment in most varieties indicating that their role in UV photoprotection may be subordinate to that of the flavonoids.

Drying methods and structure-activity of hydroxycinnamic acid derivatives in the Idesia polycarpa Maxim. leaves

2020 ◽  
Author(s):  
Lei Huang ◽  
Yu Zhu ◽  
Tong Peng ◽  
Jianfei Qiu ◽  
Qing Rao ◽  
...  
Keyword(s):  
Biological Activities ◽  
Hydroxycinnamic Acid ◽  
Drying Methods ◽  
Post Harvest ◽  
Structure Activity ◽  
Hydroxycinnamic Acid Derivatives ◽  
Excellent Source

The Idesia polycarpa Maxim. leaves is an excellent source of hydroxycinnamic acid derivatives which have been drawn special attention due to the various biological activities. However, the effect of post-harvest...

Synthesis and Antioxidant Properties of Hydroxycinnamic Acid Derivatives Containing Isobornyl Substituents

2019 ◽  
Vol 55 (4) ◽  
pp. 658-664 ◽  
Author(s):  
I. A. Dvornikova ◽  
E. V. Buravlev ◽  
I. V. Fedorova ◽  
O. G. Shevchenko ◽  
I. Yu. Chukicheva ◽  
...  
Keyword(s):  
Antioxidant Properties ◽  
Hydroxycinnamic Acid ◽  
Hydroxycinnamic Acid Derivatives

Composition of callus resin of Norway spruce, Scots pine, European larch and Douglas fir

Holzforschung ◽  
2008 ◽  
Vol 62 (4) ◽  
Author(s):  
Thomas Holmbom ◽  
Markku Reunanen ◽  
Pedro Fardim
Keyword(s):  
Callus Tissue ◽  
Resin Acid ◽  
Hydroxycinnamic Acid ◽  
Resin Acids ◽  
Minor Components ◽  
European Larch ◽  
Hydroxycinnamic Acid Derivatives ◽  
Conifer Trees ◽  
Tree Stem ◽  
Microbial Attack

Abstract On damage of conifer trees, oleoresin is exuded onto the tree stem. The oleoresin is typically composed of monoterpenes and resin acids. It serves to protect the tree from dehydration and microbial attack. Callus resin, in the traditional German term “Überwallungsharz”, is a resin exuded from the callus tissue formed as the wound is closed by annual growth. These resins can usually be found as nodules or lumps on the rim of the closing wound. Both types of resin, collected from Picea abies, Pinus sylvestris, Larix decidua and Pseudotsuga menziesii, were analyzed separately by GC/GC-MS. Expectedly, the oleoresin samples were composed of resin acids. However, the callus resins were of a completely different composition as they are composed primarily of lignans and hydroxycinnamic acid derivatives. In addition, the L. decidua sample contained significant amounts of abietol and abietadiene. The P. abies and L. decidua callus resins were found to be essentially resin acid-free. The components identified in the callus resin samples have previously been identified as minor components in oleoresin and bark samples. The potential for the inadvertent inclusion of callus resin in previously analyzed samples of oleoresin, bark and ingrown (dead) knots is highlighted.

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