The present invention provides an acid addition salt of 5-aminolevulinic acid (5-ALA) or of a 5-ALA derivative (e.g. a 5-ALA ester) with an acid which has a pKa of about 5 or less, preferably about 3 or less, with the proviso that the acid is other than hydrochloric acid. Particularly preferred salts are those derived from acids selected from the group comprising sulphonic acid and its derivatives, hydrobromic acid, sulfuric acid, nitric acid and phosphoric acid. The salts in accordance with the invention are particularly suitable for use as photosensitizing agents in diagnosis and photochemotherapy of disorders or abnormalities of external or internal surfaces of the body.
本发明提供了一种
5-氨基戊酸(
5-ALA)或
5-ALA衍
生物(例如
5-ALA酯)的酸加成盐,所述酸具有大约5或更低的pKa值,优选大约3或更低的pKa值,但该酸不包括
盐酸。特别优选的盐是来源于选自
磺酸及其衍
生物,
氢溴酸,
硫酸,
硝酸和
磷酸组成的酸的盐。根据本发明的盐特别适用于用作诊断和光化疗治疗身体内外表面的疾病或异常的光敏剂。