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n.1.(Org. Chem.) A colorless liquid base, C4H9.NH2, of which there are four isomeric varieties.
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Cytochrome C from equine and bovine heart, normal and sickle cell hemoglobin, sinapinic acid, acetic anhydride, amino acids (serine, cysteine, tyrosine, threonine, asparagine, glutamine, lysine, arginine, histidine, and glycine), urea, pepsin, and n-butylamine were purchased from Sigma (St.
Acetic anhydride (15 [micro]l) and n-butylamine (30 [micro]l) were combined in a plastic vial and allowed to react for 15 minutes.
Then n-butylamine was added in a 2:1 molar ratio and allowed to react for several minutes to quench any unreacted anhydride.
We chose n-butylamine to react with any excess acetic anhydride, forming n-butylethanamide.
N-butylamine and dibutylamine, both from Tedia Company, were used as received to prepare the 25% (v/v) aqueous solutions used as ESC agents.
Both tests were performed at first without any ECS agent and then with aqueous solutions of dibutylamine and n-butylamine (18).
Critical stress--[sigma] (MPa) Sample No ESC agent Dibutylamine n-Butylamine VBPET 59.
It can also be observed that n-bulylamine, which has a lower molar volume when compared with dibutylamine, was much more aggressive than dibutylamine because the values of critical stress in n-butylamine were lower than in dibutylamine.