Abstract Two-dimensional gas chromatography coupled to time-of-flight mass spectrometry (GC × GC-TOFMS) is a powerful tool for identification of compounds in complex samples. Herein, we compared the GC GC-TOFMS and systems polar metabolite profiling rice seeds. Forty-seven thirty-six metabolites were detected Korean cultivar, Dongjin, using GC-TOFMS, respectively. The limits detection shikimic,...

Climate changes, mostly related to high temperature, are predicted to have major negative impacts on coffee crop yield and bean quality. Recent studies revealed that elevated air [CO2] mitigates the impact of heat on leaf physiology. However, the extent of the interaction between elevated air [CO2] and heat on coffee bean quality was never addressed. In this study, the single and combined impac...

p-Coumaric acid is the precursor of phenylpropanoids, which are plant secondary metabolites that are beneficial to human health. Tyrosine ammonia lyase catalyzes the production of p-coumaric acid from tyrosine. Because of their photosynthetic ability and biosynthetic versatility, cyanobacteria are promising candidates for the production of certain plant metabolites, including phenylpropanoids. ...

This paper demonstrates for the first time that plant metabolites of the phenylamide type, conjugates of putrescine with hydroxycinnamic acids (p-coumaric, caffeic and ferulic), possess 1O2 quenching properties. Data were obtained confirming that their acidic parent compounds were also able to quench 1O2, as did polyamines (putrescine, spermidine and spermine), and that this ability depends on ...

The aim of the work was to determine main groups polyphenolic compounds in Quercus rubra L. raw materials.
 Materials and methods. leaves annual shoots Northern Red Oak used for research were collected August Lisnyky village Obuhiv district Kyiv Oblast (Ukraine). Determination component composition quantitative content flavonoids (including separately catechins), hydroxycinnamic acids, phe...

Prior experimental observations, as well as theoretical considerations, have led to the proposal that C(4)-C(7) single-bond rotation may play an important role in the primary photochemistry of photoactive yellow protein (PYP). We therefore synthesized an analog of this protein's 4-hydroxy-cinnamic acid chromophore, (5-hydroxy indan-(1E)-ylidene)acetic acid, in which rotation across the C(4)-C(7...

An integrated strategy was followed to valorise rice straw, one of the most relevant biomass feedstocks available worldwide, to selectively recover solubilised hemicelluloses and lignin. The pathway encompassed the use of autohydrolysis to hydrolyse the hemicelluloses and an ethanol-based organosolv process to solubilise lignin. Several autohydrolysis conditions were assayed with the best resul...

The present work reports amounts of flavonoids and phenylpropanoids of culms of three sugarcane varieties and of raw juice, syrup, molasse and VHP sugar. The antioxidant activity of those materials was evaluated by the DPPH and b-carotene/linoleic acid methods. The predominant phenolics in culms were phenylpropanoids (caffeic, chlorogenic and coumaric acids), while flavones (apigenin, tricin an...

Abstract Hydroxycinnamoyl shikimates were reported in 2005 to be intermediates monolignol biosynthesis. 3-Hydroxylation of p -coumarate, originally thought occur via coumarate 3-hydroxylase (C3H) from -coumaric acid or its CoA thioester, was revealed the action coumaroyl shikimate 3?-hydroxylase (C3?H) utilizing -coumaroyl as substrate, itself derived -coumaroyl-CoA hydroxycinnamoyl-CoA: hydrox...

Chrysopogon gryllus and Festuca vallesiaca are components of a number of meadow-pasture communities in Serbia. We performed the analyses of phenolics that influence quality and digestibility of grasses to a great extent. Total phenolics were measured spectrophotometrically and phenolic acids by HPLC analysis. The aboveground parts of C. gryllus contained 10.6 mg/g whereas F. vallesiaca of 21.6 ...