Rautatammenlehtiteen fenoliset antioksidantit

 Otan tämän luettelon glukoosiblogiin, koska tätä teetä on käytetty diabeteksen hoitoon  joissain kulttuureissa ja sillä on myös hyvät ominaisuudet pahojen  (PAH) lisäksi.  Tästä artikkelista herää ajatus, että  kasvin runsaita  orgaanisia fenolisia  antioksidantteja voitaisiin käyttää - haitta-aineista puhdistamisen jälkeen-  luonnonantioksidantteina synteettisten sijasta, jolloin tämä rautatammi katsottaisiin  raaka-aineeksi, josta voitaisiin saada niitä antioksidantimolekyylejä esiin. eikä niin että koko kasvia kaikkine osinensa seoksena suoraan käytettäisiin .http://www.sfcri.com/vilka-ar-farorna-med-yerba-mate-for-cancer/  Ei taida sopia suomalaiselle koska  voi vaihtaa päälle kansan perinnölliset maksasyöpägeenit, sillä geenisäätövaikutus on vahva.

Molecules 2007, 12(3), 423-432; doi:10.3390/12030423

Article Phenolic Antioxidants Identified by ESI-MS from Yerba Maté (Ilex paraguariensis) and Green Tea (Camelia sinensis) Extracts

Deborah H Bastos ^1,* , Luciane A Saldanha ¹, Rodrigo R Catharino ², Alexandra Sawaya ², Ildenize B Cunha ², Patricia O Carvalho ³ and Marcos N Eberlin ²

Received: 21 December 2006 / Revised: 3 March 2007 / Accepted: 4 March 2007 / Published: 12 March 2007

(This article belongs to the Special Issue Phenolics and Polyphenolics)

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Abstract

Aqueous extracts of green yerba maté (Ilex paraguariensis) and green tea (Camellia sinensis) are good sources of phenolic antioxidants, as already described in the literature. The subject of this study were organic extracts from yerba maté, both green and roasted, and from green tea. Their phenolic profiles were characterized by direct infusion electrospray insertion mass spectrometry (ESI-MS) and their free radical scavenging activity was determined by the DPPH assay.

 Organic extracts containing phenolic antioxidants might be used as natural antioxidants by the food industry, replacing the synthetic phenolic additives used nowadays.

 Ethanolic and aqueous extracts from green yerba maté, roasted yerba maté and green tea showed excellent DPPH scavenging activity (>89%). The ether extracts from green and roasted yerba maté displayed a weak scavenging activity, different from the behavior observed for the green tea ether extract. The main phenolic compounds identified in green yerba maté water and ethanolic extracts were:

caffeic acid, 

quinic acid,

 caffeoyl glucose,

 caffeoylquinic acid,

 feruloylquinic acid,

 dicaffeoylquinic acid

 and rutin.

 After the roasting process two new compounds were formed:

 caffeoylshikimic acid

 and dicaffeoylshikimic acid. 

The ethanolic extracts from yerba maté, both roasted and green, with lower content of phenolic compounds (3.80 and 2.83 mg/mL) presented high antioxidant activity and even at very low phenolic concentrations, ether extract from GT (0.07 mg/mL) inhibited DPPH over 90%.

Keywords: Yerba maté (Ilex paraguariensis); Green tea (Camellia sinensis); Phenolic compounds; ESI-MS; Natural antioxidant; Free radical scavenging activity

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Rautatammiteen cancerogeenisyys johtuu polysyklisistä aromaatisista hiilivedyistä

 Mielestäni tätä teetä ei pitäisi käyttää  diabeteksen tasapainotukseen tai laihdutuslääkkeenä.Kuitenkin tämä on monessa maassa E-Amerikassa tavallinen kulttuurijuoma, joten suositukseni eivät yllä tästä pitemmälle. http://www.sfcri.com/vilka-ar-farorna-med-yerba-mate-for-cancer/

LÄHDE: Cancer Epidemiol Biomarkers Prev. 2008 May;17(5):1262-8. doi: 10.1158/1055-9965.EPI-08-0025.High levels of carcinogenic polycyclic aromatic hydrocarbons in mate drinks.

Kamangar F¹, Schantz MM, Abnet CC, Fagundes RB, Dawsey SM.

Abstract BACKGROUND:

Drinking mate has been associated with cancers of the esophagus, oropharynx, larynx, lung, kidney, and bladder. We conducted this study to determine whether drinking mate could lead to substantial exposure to polycyclic aromatic hydrocarbons (PAH), including known carcinogens, such as benzo[a]pyrene.

METHODS: The concentrations of 21 individual PAHs were measured in dry leaves of eight commercial brands of yerba mate and in infusions made with hot (80 degrees C) or cold (5 degrees C) water. Measurements were done using gas chromatography/mass spectrometry, with deuterated PAHs as the surrogates. Infusions were made by adding water to the leaves, removing the resulting infusion after 5 min, and then adding more water to the remaining leaves. This process was repeated 12 times for each infusion temperature.

RESULTS: The total concentrations of the 21 PAHs in different brands of yerba mate ranged from 536 to 2,906 ng/g dry leaves. Benzo[a]pyrene concentrations ranged from 8.03 to 53.3 ng/g dry leaves. For the mate infusions prepared using hot water and brand 1, 37% (1,092 of 2,906 ng) of the total measured PAHs and 50% (25.1 of 50 ng) of the benzo[a]pyrene content were released into the 12 infusions. Similar results were obtained for other hot and cold infusions.

CONCLUSION: Very high concentrations of carcinogenic PAHs were found in yerba mate leaves and in hot and cold mate infusions. Our results support the hypothesis that the carcinogenicity of mate may be related to its PAH content.

PMID:18483349 [PubMed - indexed for MEDLINE]

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