TY - JOUR
T1 - E.s.r.-spintrap and u.v. investigations of solutions of d-glucose and lactose irradiated with ultrasound
AU - Kudo, Tetsu
AU - Heusinger, Helmut
N1 - Funding Information:
The authors thank the Dr. Ing. Leonhard Lorenzstiftung for financial sup-and lhr Dt-uld~er Akademischcr Austauschdianst Car a scholarship (to tenable at theInstitutfiirRadiochemie derTechnischen Universitlt Miinchen.
PY - 1983/11/11
Y1 - 1983/11/11
N2 - The effects of ultrasound on solutions of α-d-glucose and α-lactose have been studied by an e.s.r.-spintrap technique and u.v. absorption spectroscopy. 2,4,6-Tri-tert-butylnitrosobenzene (BNB) was used as the spintrap. Sonolysis of the sugar solutions produced the adduct BNB-H and, for methanol, the adduct BNB-CH2OH also. The adducts are formed if BNB is present before or after sonolysis. Formation of the adducts by direct degradation of the solvent is excluded, because sonolysis of sugar-free BNB solutions produces no adducts. The u.v. spectrum after sonolysis shows an absorption band with λmax ∼270 nm, suggesting that a reductone {A figure is presented} is present. Using l-ascorbic acid and dihydroxyacetone as model compounds, it is shown that solutions of α-d-glucose containing l-ascorbic acid or dihydroxyacetone and BNB give e.s.r. results similar to those for sonolysed solutions containing sugar and BNB. A mechanism for the production of the adducts is proposed.
AB - The effects of ultrasound on solutions of α-d-glucose and α-lactose have been studied by an e.s.r.-spintrap technique and u.v. absorption spectroscopy. 2,4,6-Tri-tert-butylnitrosobenzene (BNB) was used as the spintrap. Sonolysis of the sugar solutions produced the adduct BNB-H and, for methanol, the adduct BNB-CH2OH also. The adducts are formed if BNB is present before or after sonolysis. Formation of the adducts by direct degradation of the solvent is excluded, because sonolysis of sugar-free BNB solutions produces no adducts. The u.v. spectrum after sonolysis shows an absorption band with λmax ∼270 nm, suggesting that a reductone {A figure is presented} is present. Using l-ascorbic acid and dihydroxyacetone as model compounds, it is shown that solutions of α-d-glucose containing l-ascorbic acid or dihydroxyacetone and BNB give e.s.r. results similar to those for sonolysed solutions containing sugar and BNB. A mechanism for the production of the adducts is proposed.
UR - http://www.scopus.com/inward/record.url?scp=0003165582&partnerID=8YFLogxK
U2 - 10.1016/0008-6215(83)88379-7
DO - 10.1016/0008-6215(83)88379-7
M3 - Article
AN - SCOPUS:0003165582
SN - 0008-6215
VL - 123
SP - 41
EP - 52
JO - Carbohydrate Research
JF - Carbohydrate Research
IS - 1
ER -