41. In particular, on adding tartaric acid . 42. He studied its pathology, confirming that the worms in the circulatory system could be cured by intravenous tartaric acid . 43. This material is the source for most commercial tartaric acid , which is used in cooking and in organic chemistry. 44. He noticed that a compound of titanium and tartaric acid from wine had a curious effect on certain molecules. 45. During this period he discovered tartaric acid and with his friend, Retzius, studied the relation of quicklime to calcium carbonate. 46. The acid is called so because it may be produced indirectly from tartaric acid , which is found in the grape. 47. Tartaric acid is a characteristic of grapes; in its leaves its content ranges from 5 to 7 grams per litre.48. Daeschel says that when the malic and tartaric acids in wine are combined with the alcohol, the solution kills germs. 49. The racemic mixture of this chiral compound may be separated into enantiomers by conversion into the diastereomeric tartaric acid ammonium salt. 50. The wine is kept at this temperature until much of the tartaric acid has crystallized and precipitated out of the wine.
