Table 5.

Calculated ΔH°(c) (in kJ/mol) of Non-ionic and Zwitter-ionic Forms of Amino Acids.

Molecule name	ΔH°c calc Non-Ionic Form	Diff.	ΔH°c calc Zwitter Form	ΔH°c exp	References
(l)-Alanine	−1688.7	−64.9	−1623.8	−1621.0	[267,268]
(l)-Cy(l)-Cysteine	−2316.2	−64.9	−2251.3	−2263.0	[21]
(l)-Cystine	−4373.5	−132.3	−4241.2	−4248.0	[21]
(l)-Histidine	−3230.8	−64.9	−3165.9	−3180.6	[275]
(l)-Hydroxyproline	−2605.5	−37.9	−2567.6	−2594.1	[21]
(l)-Methionine	−3626.5	−62.3	−3564.2	−3564.1	[266]
2-Aminobutyric acid	−2342.1	−62.2	−2279.9	−2254.0	[21]
2-Methylalanine	−2323.3	−54.3	−2269.0	−2265.9	[21]
2-Phenylglycine	−4046.5	−62.2	−3984.3	−4005.1	[21]
4-Aminobutyric acid	−2345.1	−57.3	−2287.8	−2283.9	[21]
5-Aminovaleric acid	−2998.5	−57.3	−2941.2	−2937.0	[21]
8-Aminocaprylic acid	−4958.9	−57.3	−4901.6	−4884.0	[21]
Asparagine	−2000.8	−64.8	−1936.0	−1928.5	[265,266,269]
Aspartic acid	−1674.0	−64.9	−1609.1	−1602.9	[21]
beta-Alanine	−1691.6	−57.3	−1634.3	−1622.9	[21]
Dopa	−4285.5	−67.5	−4218.0	−4177.8	[21]
epsilon-Aminocaproic acid	−3652.0	−57.3	−3594.7	−3582.2	[21]
Glutamic acid	−2327.7	−62.2	−2265.5	−2277.0	[21]
Glutamine	−2654.6	−62.3	−2592.3	−2572.8	[265,269]
Glycine	−1038.1	−57.3	−980.8	−978.6	[268,269]
Isoleucine	−3651.0	−62.2	−3588.8	−3583.7	[269]
Isoserine	−1497.9	−57.4	−1440.5	−1438.2	[21]
Leucine	−3648.4	−64.9	−3583.5	−3581.2	[269]
Norleucine	−3649.1	−62.3	−3586.8	−3582.2	[21]
N-Phenylglycine	−4074.7	−40.2	−4034.5	−4037.6	[21]
Phenylalanine	−4702.6	−67.5	−4635.1	−4646.3	[269]
Proline	−2798.9	−56.5	−2742.4	−2746.2	[269]
Sarcosine	−1716.2	−27.4	−1688.8	−1675.1	[270]
Serine	−1504.4	−64.8	−1439.6	−1438.9	[269]
Threonine	−2151.3	−62.2	−2089.1	−2087.1	[269,275,277]
Tryptophane	−5671.0	−64.9	−5606.1	−5629.4	[269,274]
Tyrosine	−4494.1	−64.9	−4429.2	−4428.1	[269]
Valine	−2994.9	−62.2	−2932.7	−2933.9	[269]