2-Aminoethanol

Effect of 2-aminoethanol pretreatment on the antioxidant enzyme activity in Zea mays under oxidative stress[Reference: WebLink]

Russian Journal of Plant Physiology, 2011,58 (1):45-50.

Exposure of plants to stress may result in liberation of 2-Aminoethanol as an inducer of alarm reaction that activates cellular resistance and tolerance mechanisms.
METHODS AND RESULTS:
In the present study, the effect of exogenous 2-Aminoethanol on stimulation of tolerance mechanisms was investigated in maize (Zea mays L.) plants treated with the herbicide paraquat. Maize shoots were pretreated with 2-Aminoethanol. Two days later the shoots were treated with paraquat. Pretreatment with 2-Aminoethanol increased catalase and guaiacol peroxidase activities and cysteine content and decreased MDA and hydrogen peroxide content in maize plants treated with paraquat.
CONCLUSIONS:
Based on the results of this study, it can be suggested that strengthening of the antioxidant mechanisms by plant pretreatment with amino alcohol could be helpful in the development of a broad tolerance to adverse stress conditions.

2-Aminoethanol as a possible neuromodulator in the pigeon optic tectum.[Pubmed: 7145226]

Neurosci Lett. 1982 Sep 20;32(1):53-8.

METHODS AND RESULTS:
A mass fragmentographic method was used for determination of low molecular weight compounds in perfusates collected in vivo in the pigeon optic tectum by a push-pull cannula technique. 2-Aminoethanol (ethanolamine) could be collected under resting conditions (5.6 +/- 0.09 pmol/min). Electrical stimulation of optic nerve induced a 2.3-fold increase of the tectal ethanolamine outflow whereas that of GABA was not affected. Ethanolamine applied iontophoretically to tectal neurons did not influence their spontaneous discharge; however, their glutamate-induced excitation as well as the GABA-induced depression were enhanced if ethanolamine was applied simultaneously.
CONCLUSIONS:
It is suggested that optic nerve stimulation exerts a neuromodulatory effect on tectal neurons.

Effect of 2-aminoethanol on the synthesis, binding, uptake and metabolism of GABA[Pubmed: 6320073]

Neurosci Lett. 1983 Dec 11;42(3):293-7.

2-Aminoethanol (ethanolamine) was studied for effects on neurochemical assays for GABA synthesis, receptor binding, uptake and metabolism in rat brain preparations.
METHODS AND RESULTS:
The effects of ethanolamine were compared with those of ethanolamine O-sulphate (EOS), an inhibitor of GABA degradation. Furthermore, the effect of both compounds was compared on GABA metabolism in rat brain in vivo. In vitro, ethanolamine and EOS had no significant effect on the GABA synthesizing enzyme glutamic decarboxylase (GAD) and GABA uptake, but both drugs proved virtually equipotent to inhibit the GABA degrading enzyme GABA aminotransferase (GABA-T). EOS was a relatively potent inhibitor of GABA receptor binding, whereas ethanolamine was not effective in this regard. Following systemic administration in rats, 50% inhibition of GABA-T in the brain was achieved by 500 mg/kg ethanolamine or 2000 mg/kg EOS, respectively. As a consequence of GABA-T inhibition, GABA levels increased significantly. GAD activity remained unchanged after both treatments.
CONCLUSIONS:
The present results suggest that the recently reported enhancement of functional effects of GABA by ethanolamine may relate, at least in part, to the inhibitory effect of the compound on GABA catabolism.

J. Phys. Chem. A, 2002, 106 (4), pp 668–679

Hydrogen Bonding in Monomers and Dimers of 2-Aminoethanol[Reference: WebLink]

METHODS AND RESULTS:
Equilibrium structures of monomers and dimers of 2-Aminoethanol (AE) exhibiting different intramolecular and intermolecular hydrogen bonds between the OH and NH2 groups were optimized and analyzed in theoretical density functional B3LYP/6-311++G(2d,2p) calculations. Natural bond orbital (NBO) theory was applied to quantify the relative strength of these interactions and to account for their effect on stability, structural, and vibrational parameters of both monomers and dimers. It is shown that the charge transferred from the lone pair of the hydrogen bond acceptor to the antibonding orbital of the donor provides the substantial stabilizing component of the hydrogen bond. NBO energetic analysis demonstrates that the OH···N interaction is the strongest one for both monomers (intramolecular) and dimers (intermolecular). The intramolecular hydrogen bond in AE monomers is relatively weak, in part, because of its bent nature. The formation of a stronger and more linear intermolecular hydrogen bond between molecular units in AE dimers is accompanied by cooperative enhancement of the intramolecular hydrogen-bonding interactions.
CONCLUSIONS:
This effect is explained in terms of charge transfer among local bond orbitals and is relevant to the cooperative strengthening of hydrogen-bonding interactions in larger AE clusters.