l-Gln was purchased from Sigma–Aldrich and used without any further purification. The mass fraction purity is >0.99. The ethanol and acetone used for experiments were of analytical reagent grade. Their mass fraction purities were greater than 0.99.
l-Gln was purchased from Sigma–Aldrich and used without any further purification. The mass fraction purity is >0.99. The ethanol and acetone used for experiments were of analytical reagent grade. Their mass fraction purities were greater than 0.99.