Presence and racemisation of amino acids in calcium oxalate patinas. A case study from the Baptistery in Parma, Italy.
The organic material present in oxalate patinas, collected from the stone external surfaces of the Baptistery in Parma (Italy), was analysed by GC-MS. The high racemisation levels determined for several specific amino acids indicate that microbial activity could contribute to the formation and modification of the organic material leading to the calcium oxalate patinas.
Casoli
Antonella
A
Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica dell'Università, Parco Area delle Scienze, 17A-43100 Parma, Italy. antonella.casoli@unipr.it
Palla
Gerardo
G
D000596:Amino Acids / Q000032:analysis*; D002129:Calcium Oxalate / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007536:Isomerism; D007558:Italy
D000596:Amino Acids; D002129:Calcium Oxalate