Mi chiedevo....
sarebbe possibile l'intervento di due esperti in questo stesso forum, per dare un giudizio alla diatriba?
Mi riferisco a Fabrizio Zago e a Marco Valussi che è vicino di forum, e riporto per loro comodità le ricerche riportate da un terzo esperto in materie erboristiche, ecc.
Le ricerche sono del 2002 e del 2004. Mi piacerebbe sapere se loro le ritengono attendibili.
1: J Altern Complement Med. 2002 Jun;8(3):333-40.
The effectiveness of processed grapefruit-seed extract as an antibacterial agent: II. Mechanism of action and in vitro toxicity.
Heggers JP, Cottingham J, Gusman J, Reagor L, McCoy L, Carino E, Cox R, Zhao JG.
Department of Surgery (Plastic), School of Medicine, University of Texas Medical Branch, Galveston, USA.
[email protected]
OBJECTIVES: Recent testimonials report grapefruit-seed extract, or GSE to be effective against more than 800 bacterial and viral strains, 100 strains of fungus, and a large number of single and multicelled parasites. This study investigated GSE for antibacterial activity at varying time intervals and concentration levels and tissue toxicity at varying concentrations in an effort to determine if a concentration existed that was both microbicidal and nontoxic and in what period of time.
DESIGN: Gram-negative and gram-positive isolates were introduced into graduated dilutions of GSE (twofold concentrations ranging from 1:1, through 1:512) for determination of bacterial activity. In vitro assays with human skin fibroblast cells were also performed at the same dilutions to determine toxicity.
RESULTS: These tests indicated that from the 1:1 through the 1:128 concentrations, GSE remained toxic as well as bactericidal. However, test results indicated that at the 1:512 dilution, GSE remained bactericidal, but completely nontoxic.
CONCLUSIONS: The initial data shows GSE to have antimicrobial properties against a wide range of gram-negative and gram-positive organisms at dilutions found to be safe. With the aid of scanning transmission electron microscopy (STEM), the mechanism of GSE's antibacterial activity was revealed. It was evident that GSE disrupts the bacterial membrane and liberates the cytoplasmic contents within 15 minutes after contact even at more dilute concentrations.
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Acta Pharm. 2004 Sep;54(3):243-50.Links
Antimicrobial activity of grapefruit seed and pulp ethanolic extract.Cvetnić Z, Vladimir-Knezević S.
Department of Microbiology, Faculty of Pharmacy and Biochemistry, University of Zagreb, Croatia.
[email protected]
Antibacterial and antifungal activity of ethanolic extract of grapefruit (Citrus paradisi Macf., Rutaceae) seed and pulp was examined against 20 bacterial and 10 yeast strains. The level of antimicrobial effects was established using an in vitro agar assay and standard broth dilution susceptibility test. The contents of 3.92% of total polyphenols and 0.11% of flavonoids were determined spectrometrically in crude ethanolic extract. The presence of flavanones naringin and hesperidin in the extract was confirmed by TLC analysis. Ethanolic extract exibited the strongest antimicrobial effect against Salmonella enteritidis (MIC 2.06%, m/V). Other tested bacteria and yeasts were sensitive to extract concentrations ranging from 4.13% to 16.50% (m/V)."
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Ringrazio chiunque voglia partecipare al discorso.
franceschilla (organizzatrice di summit

)