{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,2]],"date-time":"2026-05-02T06:41:33Z","timestamp":1777704093641,"version":"3.51.4"},"reference-count":60,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2024,11,14]],"date-time":"2024-11-14T00:00:00Z","timestamp":1731542400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001824","name":"Czech Science Foundation","doi-asserted-by":"publisher","award":["22-07164S"],"award-info":[{"award-number":["22-07164S"]}],"id":[{"id":"10.13039\/501100001824","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>As a part of our effort to establish reliable thermodynamic data for amino acids, the heat capacity and phase behavior are reported for two stable polymorphs (\u03b1 and \u03b3) of glycine (aminoacetic acid, CAS RN: 56-40-6). Prior to heat capacity measurement, thermogravimetric analysis and X-ray powder diffraction were performed to determine decomposition temperatures and initial crystal structures, respectively. The literature heat capacities obtained by adiabatic calorimetry are available in the temperature interval (7\u2013304). The literature data were used for validating performance of our relaxation (heat-pulse) calorimeter, which was used for measurement of the heat capacity of \u03b1-glycine in the temperature interval (2\u2013267) K. The crystal heat capacities of the \u03b1- and \u03b3-glycine were extended towards higher temperatures using Tian\u2013Calvet calorimetry in the temperature interval (262\u2013358) and power compensation DSC in the temperature interval (310\u2013449) K. As a result, reference heat capacities and thermodynamic functions for the crystalline phase from 0 K up to 450\/435 K for \u03b1\/\u03b3-glycine were developed. The literature heat capacities for \u03b2-glycine over the range 0 K to 295 K were treated in the same manner in order to provide thermodynamic data for all three polymorphs existing at the atmospheric pressure.<\/jats:p>","DOI":"10.3390\/molecules29225366","type":"journal-article","created":{"date-parts":[[2024,11,14]],"date-time":"2024-11-14T08:06:32Z","timestamp":1731571592000},"page":"5366","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Heat Capacities of \u03b1-, \u03b2-, and \u03b3- Polymorphs of Glycine"],"prefix":"10.3390","volume":"29","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4145-7982","authenticated-orcid":false,"given":"V\u00e1clav","family":"Pokorn\u00fd","sequence":"first","affiliation":[{"name":"Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technick\u00e1 5, CZ-166 28 Prague, Czech Republic"},{"name":"Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsk\u00e9ho n\u00e1m. 2, CZ-162 06 Prague, Czech Republic"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2839-8546","authenticated-orcid":false,"given":"Vojt\u011bch","family":"\u0160tejfa","sequence":"additional","affiliation":[{"name":"Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technick\u00e1 5, CZ-166 28 Prague, Czech Republic"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3613-7642","authenticated-orcid":false,"given":"Jakub","family":"Havl\u00edn","sequence":"additional","affiliation":[{"name":"Central Laboratories, University of Chemistry and Technology, Prague, Technick\u00e1 5, CZ-166 28 Prague, Czech Republic"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5707-0670","authenticated-orcid":false,"given":"Michal","family":"Fulem","sequence":"additional","affiliation":[{"name":"Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technick\u00e1 5, CZ-166 28 Prague, Czech Republic"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9048-1036","authenticated-orcid":false,"given":"Kv\u011btoslav","family":"R\u016f\u017ei\u010dka","sequence":"additional","affiliation":[{"name":"Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technick\u00e1 5, CZ-166 28 Prague, Czech Republic"}]}],"member":"1968","published-online":{"date-parts":[[2024,11,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1833","DOI":"10.1021\/acs.jced.9b01086","article-title":"Heat Capacities of L-Alanine, L-Valine, L-Isoleucine, and L-Leucine: Experimental and Computational Study","volume":"65","author":"Fulem","year":"2020","journal-title":"J. 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