许多研究结果表明,牛奶中与锌结合的小分子量的配体是柠檬酸和吡啶羧酸(Picolinic acid),后者是色氨酸的一个较小代谢产物,能促进机体对食物锌的吸收和利用、刺激幼年大鼠的生长、对胃肠型皮肤炎也有治疗作用。作者过去的工作证实,吡啶羧酸增加体外培养的十二指肠和结肠片段摄取锌,并使活体大鼠尿锌排泄量明显增加,说明吡啶羧酸可能仅加速肠粘膜对锌的摄取并增强锌在体内转运,而不增加其 Many studies have shown that the small zinc-binding ligands in milk are citric acid and Picolinic acid, a smaller metabolite of tryptophan that promotes the body’s absorption of food zinc and Use, stimulate the growth of young rats, gastrointestinal type dermatitis also have a therapeutic effect. Previous work by the authors confirmed that picolinic acid increased zinc uptake in duodenum and colon sections cultured in vitro and significantly increased excretion of urinary zinc in living rats, suggesting that picolinic acid may only accelerate zinc uptake in the intestinal mucosa and increase Zinc is transported in the body without increasing it