Photo-catalytic polymerization of catechin molecules in alkaline aqueous

Liang, Ji-Yuan; Wu, Jun-Yun; Yang, Ming-Yeh; Hu, Anren; Chen, Liang-Yü

doi:10.1016/j.jphotobiol.2016.10.020

Cited by 26 publications

(51 citation statements)

References 27 publications

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“…We suggest that the eno‐form might be the major intermediate produced by heat‐treated catechin in alkaline solution. Our previous study reported that catechin was polymerized to proanthocyanidin in neutral or alkaline aqueous with blue light illumination (Liang et al, ). Fan et al () reported that oligomerization occurs in catechins during high temperature and long heat treatment (Fan et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…The catechin solutions were prepared as described above. The analytical conditions used in this work were described previously (Liang et al, ). Chromatographic analysis was performed as follows: Different reaction solutions were separated with a Mightysil RP‐18 GP Aqua column (5 μm, 4.6 mm i.d.…”

Section: Methodsmentioning

confidence: 99%

“…The catechin solutions were prepared before the experiment and investigated immediately using a liquid chromatography and tandem mass spectrometer (LC‐MS 2 ). The analytical conditions of chromatography and mass spectrometry used in this work were described previously (Liang et al, ). The experiments were performed on a Thermo Scientific (San Jose, USA) LC‐MS 2 system, which is comprised of an Accela vacuum pump and a triple quadrupole mass spectrometer (Thermo TSQ Quantum, USA) equipped with an atmospheric pressure chemical ionization (APCI) ion source.…”

Section: Methodsmentioning

confidence: 99%

“…Catechins are unstable under the irradiation of visible blue light (Liang, Wu, Yang, Hu, & Chen, 2016). The catechin was epimerized to epicatechin by UV light irradiation (Forest, Wan, & Preston, 2004).…”

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confidence: 99%

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Using chromatography and mass spectrometry to monitor isomerization of catechin in alkaline aqueous with thermal processing

Chen

Liang

2017

J Food Process Preserv

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Polyphenols are associated with a wide range of physiological properties. Catechins are a class of polyphenolic flavonoids predominantly found in foods and beverages that are chemically unstable.This study investigated the effects of thermal processing and pH on the structural changes to catechins and examined how these effects impact the antioxidant capacity of these molecules. The results indicated the total phenolic contents of catechin were increased after alkalifying and ther- Practical applicationsHeating process and pH adjustment are used to meet hygienic requirements and maintain flavor during tea infusion processing in tea beverage manufacturing. Catechins account for the largest sum of polyphenols found in green tea. Basification and heating could catalyze the isomerization of catechin through an opened heterocyclic ring pathway. Catechin remains stable in acidic solutions during thermal processing, thus, avoiding changes of quality.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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Using chromatography and mass spectrometry to monitor isomerization of catechin in alkaline aqueous with thermal processing

Chen

Liang

2017

J Food Process Preserv

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“…Ji‐Yuan Liang and co‐workers described the photocatalytic polymerization of catechin molecules in alkaline aqueous solvent. This method is an innovative approach to obtain a polymeric catechin.…”

Section: Introductionmentioning

confidence: 99%

Structure‐Activity Relationships Analysis of Monomeric and Polymeric Polyphenols (Quercetin, Rutin and Catechin) Obtained by Various Polymerization Methods

Latos‐Brozio

Masek

2019

Chemistry & Biodiversity

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Plant polyphenols, especially flavonoids, are active and pro-health substances found in fruits and vegetables. Quercetin and its glycoside rutin are representatives of flavonoids, commonly found in plant products. Catechins found in large quantities in tea are also a well-known group of natural polyphenols. These compounds are based on the structure of flavan-3-ol, which is why the number, positions and types of substitutions affect the scavenging of radicals and other properties. Despite some inconsistent evidence, several structureÀ activity relationships of monomeric flavonoids are well established in vitro. However, the relationships between the activity and other properties of the polymeric forms of flavonoids and their structures are poorly understood so far. The aim of this article is to compare the data on polymerization of quercetin, rutin and catechin, as well as to systematize knowledge about the structureÀ activity relationship of the polymeric forms of these compounds.

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Prickle morphogenesis in rose is coupled with secondary metabolite accumulation and governed by canonical MBW transcriptional complex

et al. 2021

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Rose is an economically important flowering plant that holds an essential place in cut flower, medicinal, and aromatic industries. The presence of prickles, epidermal outgrowths resembling trichomes, on rose is highly undesirable as these make harvesting and transportation difficult. Attempts were made for generating rose varieties lacking prickles via breeding and natural selections; however, these approaches obtained only chimeric and genetically unstable prickle‐less mutants. The alternative way to get rid of prickles is via genetic manipulations, but the molecular mechanisms of prickle initiation and development in rose are almost unexplored. Therefore, the present study was carried out to understand the morphological, molecular, and correlated metabolic changes underlining prickle morphogenesis in a prickle‐bearing Rosa hybrida L. cv. “First Red (FR)”. The histological and metabolomic analyses at three distinct stages of the prickle morphogenesis, namely, emerging tiny initiating prickles, partially greenish soft prickles, and brownish hard prickles, demonstrated a gradually increasing deposition of phenolic compounds and lignification with development. Corresponding RNAseq analysis revealed an upregulation of the genes involved in secondary metabolism, especially in the phenylpropanoid biosynthetic pathway. A set of genes encoding a transcriptional network similar to the one regulating epidermal cell differentiation leading to phenylpropanoid accumulation and trichome development, was also upregulated. Differential expression of this transcriptional network in prickle‐less R. hybrida L. cv. “Himalayan Wonder” compared to prickly FR plants substantiated its involvement in prickle morphogenesis. The results collectively supported the proposition that prickles are evolved from trichomes and provided molecular clues towards engineering prickle‐less roses. Significance statement Prickles, the vasculature less epidermal outgrowths resembling trichomes, are defense organs protecting plants against herbivory. Despite biological significance, the mechanism of prickle morphogenesis remains obscure. Here, we show that like trichomes, prickles accumulate secondary metabolites, especially lignin and flavonoids, during morphogenesis. Cognate transcriptome analysis demonstrated that upregulation of a hormone‐regulated transcriptional activation–inhibition network, known to govern trichome morphogenesis, likely triggers the differentiation of epidermal cells to outgrow into prickle.

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Photo-catalytic polymerization of catechin molecules in alkaline aqueous

Cited by 26 publications

References 27 publications

Using chromatography and mass spectrometry to monitor isomerization of catechin in alkaline aqueous with thermal processing

Using chromatography and mass spectrometry to monitor isomerization of catechin in alkaline aqueous with thermal processing

Structure‐Activity Relationships Analysis of Monomeric and Polymeric Polyphenols (Quercetin, Rutin and Catechin) Obtained by Various Polymerization Methods

Prickle morphogenesis in rose is coupled with secondary metabolite accumulation and governed by canonical MBW transcriptional complex

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