Influence of different fermentation raw materials on pyrolyzates of Pu-erh tea theabrownin by Curie-point pyrolysis-gas chromatography–mass spectroscopy

Peng, Chunxiu; Liu, Jian; Liu, Huarong; Zhang, Hongjie; Gong, Jiashun

doi:10.1016/j.ijbiomac.2012.12.021

Cited by 48 publications

(34 citation statements)

References 10 publications

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“…Other absorption bands are due to the presence of C-O-H side group and/or the vibration of C-O-C glycosidic bond [27]. The absorption bands at the range of 825-710 cm −1 could be due to the substituents on the benzene rings [16]. These data indicate that the theabrownins exist as polymerized phenolic compounds that are abundant in hydroxy and carboxyl groups and may contain glycosidic bonds.…”

Section: Spectroscopic Characteristics Of Theabrowninsmentioning

confidence: 88%

“…The relatively strong absorption peak at around 1620 cm −1 is due to the stretching vibration of C=O, which was bonded with aromatic rings. The absorption bands at 1535 cm −1 , 1450 cm −1 , 1400 cm −1 are the stretching vibration of aromatic C=C [16]. The absorption bands observed at the range of 1260-1000 cm −1 are the C-O stretching vibration, and that at around 1260 cm −1 can be attributed to the Ar C-OH group [26].…”

Section: Spectroscopic Characteristics Of Theabrowninsmentioning

confidence: 99%

“…Based on a few reported studies, theabrownins are a type of brown or reddish-brown pigment that are soluble in water but are insoluble in ethyl acetate, n-butyl alcohol or other organic solvents [12,13]. In addition, theabrownins are heterogeneous macromolecules that polymerized, condensed, coupled, and oxidized from catechins, theaflavins, and thearubigins with other compounds, such as proteins, lipids, polysaccharides, and some other components [4,16]. Because of their condensed nature, the molecules of theabrownins cannot be easily separated by chemical methods, the structural characteristics of theabrownins remain unclear, thus their applications remain limited.…”

Section: Introductionmentioning

confidence: 99%

“…It is observed that the molecular weights and the different sources of theabrownins have an impact on their structure and composition [16,17]. Therefore, researches on relatively pure and specific theabrownins are necessary.…”

Section: Introductionmentioning

confidence: 99%

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Structural Characteristics and Hypolipidemic Activity of Theabrownins from Dark Tea Fermented by Single Species Eurotium cristatum PW-1

Xiao

et al. 2020

Biomolecules

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Recently, studies on theabrownins (TBs), the main bioactive polymeric pigments found in dark tea, have received increasing attention for its health effects. Thus far, information on their structural characteristics is unclear. In the present study, theabrownins were isolated from single species Eurotium cristatum PW-1-fermented loose tea and their structural and hypolipidemic characteristics were studied for the first time. The theabrownins were fractionated by their molecular weights and were then analyzed. Ultraviolet–visible spectrophotometry (UV-Vis) and Flourier transformation infrared spectroscopy (FT-IR) showed that they were polymerized phenolic substances containing abundant hydroxy and carboxyl groups. All theabrownin samples exhibited hypolipidemic activity in high-fat zebrafish; among which TBs-10-30k sample, decreased lipid level in high-fat zebrafish to 51.57% at 1000 μg/mL, was most effective. It was found that TBs-10-30k was a type of amorphous and thermostable polymer with slice shape and smooth surface under scanning electron microscope (SEM). Atomic force microscope (AFM) analysis showed that it had island-like structure because of aggregation of theabrownin molecules. Pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) analysis further showed that the main pyrolytic products of TBs-10-30k were hexadecanoic acid (33.72%), phenol (14.90%), and eicosane (12.95%), indicating TBs-10-30k was mainly composed of phenols, lipids, saccharides, and proteins. These results not only facilitate subsequent identification of theabrownins, but also provide insights into the applications of theabrownins in functional foods.

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Section: Spectroscopic Characteristics Of Theabrowninsmentioning

confidence: 88%

Section: Spectroscopic Characteristics Of Theabrowninsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural Characteristics and Hypolipidemic Activity of Theabrownins from Dark Tea Fermented by Single Species Eurotium cristatum PW-1

Xiao

et al. 2020

Biomolecules

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“…TB are a group of biopolymers with complex and substantially different structures in Pu‐erh tea. TB are formed through the oxidation and polymerization of polyphenols, theaflavins (TF) and thearubigins (TR) …”

Section: Introductionmentioning

confidence: 99%

Serum metabolomics analysis of rat after intragastric infusion of Pu‐erh theabrownin

et al. 2016

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Examination of the variations of these differential expressed metabolites and their individual functions revealed that the TB extract accelerated lipid catabolism in rats and might affect glucose metabolism. Of these, carnitine level significantly increased after intragastric infusion of TB regardless of the type of diet, and activities of carnitine palmitoyltransferases I and II changed significantly, suggesting carnitine may be a candidate serum marker for tracking the metabolism of TB in rats. © 2015 Society of Chemical Industry.

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Different Types of Tea: Chemical Composition, Analytical Methods and Authenticity

Engelhardt

2023

Reference Series in Phytochemistry

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Influence of different fermentation raw materials on pyrolyzates of Pu-erh tea theabrownin by Curie-point pyrolysis-gas chromatography–mass spectroscopy

Cited by 48 publications

References 10 publications

Structural Characteristics and Hypolipidemic Activity of Theabrownins from Dark Tea Fermented by Single Species Eurotium cristatum PW-1

Structural Characteristics and Hypolipidemic Activity of Theabrownins from Dark Tea Fermented by Single Species Eurotium cristatum PW-1

Serum metabolomics analysis of rat after intragastric infusion of Pu‐erh theabrownin

Different Types of Tea: Chemical Composition, Analytical Methods and Authenticity

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