一种制备L-抗坏血酸-2-单磷酸酯的碱金属和碱土金属盐处理是转换的L-抗坏血酸-2-磷酸盐在碱性条件下在浓水溶液的L-抗坏血酸的碱金属或碱土金属的盐时，其量 L-抗坏血酸盐和作为基底的碱土金属氢氧化物的被确定为使得在大约8的范围内的反应介质的pH保持为约11和一个渐进传送的每一个磷酸基团从该L-抗坏血酸盐的聚磷酸中进行，直到基本上 多磷酸盐已被用完并且仅存在L-抗坏血酸2-单磷酸盐。 优选地，原位制备L-抗坏血酸-2-多磷酸酯并使用氢氧化钙作为碱。 无论L-抗坏血酸2-多磷酸酯是分别还是原位制备，优选的磷酸化剂都是三偏磷酸钠。 本发明的另一方面是在反应完成后，冷却并稀释至合适的粘度，将所得混合物喷雾干燥。 本发明方法的产品适合作为人和动物食品的添加剂; 它是氧化和热降解稳定特别敏感，并且具有L-抗坏血酸单磷酸酯相对多磷酸盐的含量特别高，因此，特别优选用于鱼饲料营养富集。

A process for preparing alkali metal and alkaline earth metal salts of L-ascorbic acid 2-monophosphate is to convert an L-ascorbic acid 2-polyphosphate under alkaline conditions with an alkali metal or alkaline earth metal salt of L-ascorbic acid in concentrated aqueous solution, the amounts of of L-ascorbic acid salt and the alkaline earth metal hydroxide used as a base are determined so that the pH of the reaction medium in the range of about 8 is maintained to about 11 and a gradual transfer in each case one phosphate group from the polyphosphate of the L-ascorbic acid salt is carried out until substantially the polyphosphate has been consumed and only L-ascorbic acid 2-monophosphate salt is present. Preferably the L-ascorbic acid 2-polyphosphate is prepared in situ and calcium hydroxide used as the base. Regardless of whether the L-ascorbic acid 2-polyphosphate is produced separately or in situ, one used as a preferred phosphorylating agent is sodium trimetaphosphate. Another aspect of the present invention is that, after completion of the reaction, cooling and dilution to a suitable viscosity, the resulting mixture is spray-dried. The product of the novel process is suitable as an additive for human and animal foods; it is particularly sensitive to oxidative and thermal degradation stable and has a particularly high content of L-ascorbic acid-monophosphate opposite polyphosphates, and is therefore, and especially preferably used for nourishing enrichment of fish food.