Editing Sulfite
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The aldehyde-sulfite adducts that may be formed from saturated aldehydes in beer are most likely not active antioxidants but may act simply as reservoirs of sulfite, whereas R,â-unsaturated aldehydes are able to bind sulfite irreversibly (Dufour et al., 1999; Nyborg et al., 1999).<ref name=andout>Andersen ML, Outtrup H, Skibsted LH. [https://pubs.acs.org/doi/full/10.1021/jf000354+ Potential antioxidants in beer assessed by ESR spin trapping.] ''J Agric Food Chem.'' 2000;48(8):3106–3111.</ref> | The aldehyde-sulfite adducts that may be formed from saturated aldehydes in beer are most likely not active antioxidants but may act simply as reservoirs of sulfite, whereas R,â-unsaturated aldehydes are able to bind sulfite irreversibly (Dufour et al., 1999; Nyborg et al., 1999).<ref name=andout>Andersen ML, Outtrup H, Skibsted LH. [https://pubs.acs.org/doi/full/10.1021/jf000354+ Potential antioxidants in beer assessed by ESR spin trapping.] ''J Agric Food Chem.'' 2000;48(8):3106–3111.</ref> | ||
The low level of sulfite produced by yeast is sufficient to act as an antioxidant, delaying oxidation.<ref name=andout/> | |||
Sulfite is a clearly a unique antioxidant in beer. It is formed naturally by the yeast during the fermentation, and according to the present study, it is the most efficient antioxidant that is naturally present in beer (Ilett, 1995; Kaneda et al., 1996). Beer lacking sulfite was found to have no lag phase for formation of radicals and accordingly no defense against the oxidative radical chain reactions. Sulfite either added as such or bound by carbonyl compounds as 1-hydroxysulfonates resulted in a lag phase. The lability of such carbonyl adducts ensure that the antioxidative effect of sulfite is not reduced.<ref name=andout/> | Sulfite is a clearly a unique antioxidant in beer. It is formed naturally by the yeast during the fermentation, and according to the present study, it is the most efficient antioxidant that is naturally present in beer (Ilett, 1995; Kaneda et al., 1996). Beer lacking sulfite was found to have no lag phase for formation of radicals and accordingly no defense against the oxidative radical chain reactions. Sulfite either added as such or bound by carbonyl compounds as 1-hydroxysulfonates resulted in a lag phase. The lability of such carbonyl adducts ensure that the antioxidative effect of sulfite is not reduced.<ref name=andout/> |