A new compound in kidney stones? Powder X-ray diffraction study of calcium glycinate trihydrate

Abstract

The present identification of a new compound in kidney stones is relevant in clinical practice. Here, poly[[di-μ-aqua-bis(glycinato-κ(2)N,O)calcium(II)] monohydrate], {[Ca(C2H4NO2)2(H2O)2]·H2O}n, has been identified in a possible kidney concretion, although it could be a 'false calculus' associated with Munchausen syndrome. The crystal packing is characterized by an infinite zigzag chain of Ca atoms in [Ca(OW)4O2N2] (OW is a water O atom) square antiprisms, sharing edges formed by water molecules. An uncoordinated water molecule interconnects the parallel chains in a three-dimensional hydrogen-bonding scheme. Similarities between the trihydrate and the monohydrate are described.

Pathological calcifications in the human joint

“…Thus it was possible to characterize calcification by X-ray diffraction [168][169][170][171][172][173][174][175] while the environment of Zn was determined by XAS spectroscopy [94]. The complete set of data indicates that at least two Zn species were present: one may correspond to Zn met- alloproteins (various Zn metalloproteins are known to inhibit biological calcification), and the other may be associated with a Zn "trap" in or on the surface of the calcification.…”

Corrosion of Heritage Objects: Collagen‐Like Triple Helix Found in the Calcium Acetate Hemihydrate Crystal Structure

“…As the constitution of acetate is similar to glycine, the existence of helical calcium glycinates appears to be very likely. Up to now, only the crystal structure of non‐helical calcium glycinate trihydrate (Ca(C 2 H 5 NO 2 )⋅3 H 2 O) has been solved …”

Korrosion von Kulturgut: Entdeckung einer kollagenartigen Tripelhelix in der Kristallstruktur von Calciumacetat‐Hemihydrat

“…Da die Konstitution des Acetations sehr ähnlich zum Glycin ist, erscheint es als sehr wahrscheinlich, dass helikale Calciumglycinate existieren. Bisher wurde jedoch nur die Kristallstruktur von nicht‐helikalem Calciumglycinat‐Trihydrat (Ca(C 2 H 5 NO 2 )⋅3 H 2 O) aufgeklärt …”