QUOTE(Odora @ 2009 10 18, 22:10)
s nesu 100% isitikinus, kad greipfrutu ekstraktas blogis, bet, kad geris irgi teigti negaliu tai kol kas susilaikau nuo jo naudojimo
daug moksliniu studiju paneige konservacines savybes
O čia yra pakankamai rimti tyrimai, kad pasidomėti plačiau:
http://www.ars.usda....Q_NO_115=182572O gamyba gražiai ir trumpai aprašyta čia. Ir labai teisingai aprašyta, jei labai įdomu, tai sunkiai ir ilgai pasirausus atrastume visos tą patį
Kiek sugebėjau prieš kelis metus išgauti technologinių aprašymų, tiek mane įtakojo daugiau niekada nevartoti GSE (ypač lašelių pavidalų iš vaistinės
) į vidų.
"What about those natural preservatives?
Alternative Natural Preservative #1- The Truth About Grapefruit Seed Extract
Grapefruit Seed Extract (GSE) is an all natural preservative
There are rumors all over the web that Grapefruit Seed Extract works as a natural preservative. Oh, we wish these were true. We even considered using it in our products. However, the sad truth is GSE is not an all natural preservative. GSE is no more natural than parabens. Grapefruit seed extract is not grapefruit juice. It is not simply ground up grapefruit seeds. It is not grapefruit essential oil. Chemical manufacturers take the leftover grapefruit pulp, a waste by-product from grapefruit juice production, and in an intensive, multi-step industrial chemical process,
change the natural phenolic compounds into synthetic quaternary ammonium compounds (does this sound natural to you?). Typically, in chemical synthesis of this type, chemical reagents and catalysts are used under extreme high heat and pressure or vacuum. Synthetic ammonium chloride is one of the chemical catalysts used in this process.
So, first all, Grapefruit Seed Extract is not natural. Its a chemically altered form of grapefruit seed. If youre going to call it Grapefruit Seed Extract, you could by the same reasoning call Sodium Laurel Sulfate Coconut Oil Extract. Secondly, studies done on GSE have found that while it may be mildly preserving, it appears to be due to trace contaminants, rather than the GSE itself.
A handmade Grapefruit Seed Extract that was not tainted with other chemicals showed zero preservative qualities. Here is one report from the Institute of Pharmacy, Ernst Moritz Arndt University, Greifswald, Germany:
The antimicrobial efficacy as well as the content of preservative agents of six commercially grapefruit seed extracts were examined. Five of the six extracts showed a high growth-inhibiting activity against the test germs. In all of the antimicrobial active grapefruit seed extracts, the preservative benzethonium chloride was detected by thin layer chromatography. Additionally, three extracts contained the preserving substances triclosan and methyl paraben. In only one of the grapefruit seed extracts tested no preservative agent was found. However, with this extract as well as with several self-made extracts from seed and juiceless pulp of grapefruits (Citrus paradisi), no antimicrobial activity could be detected. Thus, it is concluded that the potent as well as nearly universal antimicrobial activity being attributed to grapefruit seed extract is merely due to the synthetic preservative agents contained within. Natural products with antimicrobial activity do not appear to be present."