Caffeïnevrije koffie gezond ?
Iemand vroeg me of dit soort koffie gezond
is. Ik denk dat sowieso koffie niet echt gezond is want het drinken van een boon die zwart
verbrandt is en die veel caffeïne bevat is wel een goed pepmiddel maar lijkt mij niet
echt gezond. Ik kan op internet weinig over het decafé proces vinden maar schrok even van
de methodes die ik op Wikipedia aantrof. Blijkbaar is één van de opties om de boon 10
uur lang met bleekmiddelen te behandelen. Kan me niet voorstellen dat dit echt gezond is.
Wie weer weet over dit onderwerp mag mij even een mailtje sturen op : ugamedia@wirehub.nl
Ron
Direct method
In the direct method the coffee beans are first steamed for 30 minutes and then repeatedly
rinsed with either methylene chloride or ethyl acetate for about 10 hours. The solvent is
then drained away and the beans steamed for an additional 10 hours to remove any residual
solvent. Sometimes, coffees decaffeinated using ethyl acetate are misleadingly referred to
as "naturally processed" because ethyl acetate can be derived from various
fruits or vegetables. However, for the purpose of decaffeination, it is not possible to
create such a large quantity of ethyl acetate, thus the chemical is synthetically derived.
Indirect method
In the indirect method beans are first soaked in hot water for several hours, essentially
making a strong pot of coffee. Then the beans are removed and either methylene chloride or
ethyl acetate is used to extract the caffeine from the water—as in other methods, the
caffeine can then be separated from the organic solvent by simple evaporation. The same
water is recycled through this two-step process with new batches of beans. An equilibrium
is reached after several cycles, where the water and the beans have a similar composition
except for the caffeine. After this point, the caffeine is the only material removed from
the beans, so no coffee strength or other flavorings are lost. Because water is used in
the initial phase of this process, sometimes indirect method decaffeination is referred to
as "water processed" even though chemicals are used.
CO2/O2 process
With the CO2 process, pre-steamed beans are soaked in a liquid bath of carbon dioxide at
73 to 300 atmospheres. After a thorough soaking, the pressure is reduced allowing the CO2
to evaporate, or the pressurized CO2 is run through either water or charcoal filters to
remove the caffeine. The carbon dioxide is then used on another batch of beans. This same
process can also be done with oxygen (O2). These liquids work better than water because
they are kept in supercritical state near the transition from liquid to gas so that they
have the high diffusion of gas and the high density of a liquid.
Triglyceride process
Green coffee beans are soaked in a hot water/coffee solution to draw the caffeine to the
surface of the beans. Next, the beans are transferred to another container and immersed in
coffee oils that were obtained from spent coffee grounds. After several hours of high
temperatures, the triglycerides in the oils remove the caffeine - but not the flavor
elements - from the beans. The beans are separated from the oils and dried. The caffeine
is removed from the oils, which are reused to decaffeinate another batch of beans. This is
a direct contact method of decaffeination.
Reakties lezers
Ik wil even reageren op het stukje over
cafeinevrije koffie. Niet dat ik er meer over weet, maar ik kan wel mijn ervaring
vertellen. Ik ben een matige koffiedrinkster, maar ik had onlangs het idee, dat ik 's
nachts wat slechter doorsliep door het drinken van koffie 's avonds. Ik heb toen
cafeinevrije koffie geprobeerd, maar dat was hopeloos. Ik sliep
niet beter, maar werd 's morgens met een zwaar, duf hoofd wakker. Na een aantal dagen
proberen heb ik het opgegeven en ben alleen slappere gewone koffie gaan drinken 's avonds
en toen was het weer over. Ik dacht toen wel, dat het verwijderen van de cafeine stoffen
in de koffie brengt, waar ik niet tegen kan, maar wist niets over het procedé. Gezond
lijkt het dus niet.
Vriendelijke groeten,
Nellie Pardoel
