Guest guest Posted May 15, 2011 Report Share Posted May 15, 2011 Despite what we normally observe that " oils repeal water " , the molecular structure of triglycerides allow a few molecules of water to be weakly attached (adsorbed) to the carbonyl oxygen. So if the oil is exposed to air with significant humidity, the oil will adsorb water and will reach a saturation water content of about 0.2% after some time. The adsorbed water is not visible, it does not show as a separate phase. In a good VCO production process, this adsorbed water is removed by vacuum drying, after which the VCO should be sealed in its container, else it will adsorb again moisture from air up to saturation. This small moisture content may not give significant effects to the shelf life of the VCO except when the oil is microbially contaminated and/or exposed to significant amount of heat (from heat sources or sunlight) to cause hydrolysis. Tony ________________________________ From: Duncan Crow <duncancrow@...> Coconut Oil Sent: Sun, May 15, 2011 4:31:09 AM Subject: Re: Preserving VCO Oil repels water so I think there is no humidity adsorption into pure oils themselves. Quote Link to comment Share on other sites More sharing options...
Guest guest Posted May 15, 2011 Report Share Posted May 15, 2011 Hi Duncan, So deterioration of the oil is a purification (excluding moisture) issue then? I use Whatman filter paper to filter my oil and it produces a crystal clear oil. Moisture is at 0.18%. Still it deteriorates after about 3-4 years.  I use a non-abrasive, wet milling, non-fermenting, non-heating, oil separation method. Would highly appreciate your comments. Thanks, Rico  ________________________________ From: Duncan Crow <duncancrow@...> Coconut Oil Sent: Sun, May 15, 2011 11:14:08 PM Subject: Re: Preserving VCO  The mystery deepens here because .2% of water content does not deteriorate some VCO but does others. Quality First has one with an indefinite shelf life. Oil kills enveloped bacteria, and nearly all are enveloped, so microbial species that make coconut oil go bad are either enveloped and living only on the water-based impurities, or non-enveloped and breaking down the oil itself. The oil in one product is going rancid faster than the other, and the only difference comes down to the amount of water-soluble impurities. all good, Duncan > > This small moisture content may not give significant effects to the shelf life > of the VCO except when the oil is microbially contaminated and/or exposed to > significant amount of heat (from heat sources or sunlight) to cause hydrolysis. > > Tony > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted May 16, 2011 Report Share Posted May 16, 2011 Thank you Duncan! Will try to email Vinia again. Didnt get a reply from my previous email. Regards, Rico ________________________________ From: Duncan Crow <duncancrow@...> Coconut Oil Sent: Mon, May 16, 2011 2:33:09 PM Subject: Re: Preserving VCO  Rico, QFI's Virgin Oil De Coco Creme shows almost no rancidity in seven years at room temperature. The patented equipment they do it on uses a method remarkably like yours: wet-milling, chilling, centrifuging, a completely " no-heat " method, so you can probably hit the sweet spot yourself. I'm not sure, but if you sell oil to Vinia Marquez, the inventor, e-mail: info @t qualityfirst.on.ca she might coach you on making it " pharmaceutically pure " ; I dont know what filter she uses. But what does it matter when the world is eating the stuff up as it is? all good, Duncan > > Hi Duncan, > > So deterioration of the oil is a purification (excluding moisture) issue >then? I > > use Whatman filter paper to filter my oil and it produces a crystal clear oil. > > Moisture is at 0.18%. Still it deteriorates after about 3-4 years.  > I use a non-abrasive, wet milling, non-fermenting, non-heating, oil separation > method. > > Would highly appreciate your comments. > > Thanks, > Rico > Quote Link to comment Share on other sites More sharing options...
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