TY - JOUR
T1 - Effects of L-cysteine and N-acetyl-L-cysteine on 4-hydroxy-2,5-dimethyl- 3(2H)-furanone (Furaneol), 5-(hydroxymethyl)furfural, and 5-methylfurfural formation and browning in buffer solutions containing either rhamnose or glucose and arginine
AU - Haleva-Toledo, Einat
AU - Naim, Michael
AU - Zehavi, Uri
AU - Rouseff, Russell L.
PY - 1999/10
Y1 - 1999/10
N2 - Solutions of L-cysteine (Cys) and N-acetyl-L-cysteine (AcCys), containing glucose or rhamnose, with or without arginine, were buffered to pH 3, 5, and 7 and incubated at 70 °C for 48 h. Cys and AcCys inhibited the formation of (hydroxymethyl)furfural (HMF) from glucose and methylfurfural (MF) from rhamnose under acidic conditions. AcCys inhibited the accumulation of 4-hydroxy-2,5-dimethyl-3(2H)-furanone (DMHF, Furaneol) from rhamnose, but Cys, under our experimental conditions, enhanced Furaneol accumulation from rhamnose. Cys and AcCys reacted directly with Furaneol but not with HMF or MF. Both Cys and AcCys inhibited nonenzymatic browning at pH 7. At pH 3, however, Cys reacted with both glucose and rhamnose to produce unidentified compounds that increased the visible absorbency.
AB - Solutions of L-cysteine (Cys) and N-acetyl-L-cysteine (AcCys), containing glucose or rhamnose, with or without arginine, were buffered to pH 3, 5, and 7 and incubated at 70 °C for 48 h. Cys and AcCys inhibited the formation of (hydroxymethyl)furfural (HMF) from glucose and methylfurfural (MF) from rhamnose under acidic conditions. AcCys inhibited the accumulation of 4-hydroxy-2,5-dimethyl-3(2H)-furanone (DMHF, Furaneol) from rhamnose, but Cys, under our experimental conditions, enhanced Furaneol accumulation from rhamnose. Cys and AcCys reacted directly with Furaneol but not with HMF or MF. Both Cys and AcCys inhibited nonenzymatic browning at pH 7. At pH 3, however, Cys reacted with both glucose and rhamnose to produce unidentified compounds that increased the visible absorbency.
KW - Furaneol
KW - Furans
KW - Glucose
KW - L-cysteine
KW - N-acetyl-L-cysteine
KW - Rhamnose
UR - http://www.scopus.com/inward/record.url?scp=0033212866&partnerID=8YFLogxK
U2 - 10.1021/jf9813788
DO - 10.1021/jf9813788
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C2 - 10552780
AN - SCOPUS:0033212866
SN - 0021-8561
VL - 47
SP - 4140
EP - 4145
JO - Journal of Agricultural and Food Chemistry
JF - Journal of Agricultural and Food Chemistry
IS - 10
ER -