In addition, it was found that Hunter a value of meat color was improved in all L carnitine treated groups ( P <0.05), the content of inosinic acid and ester extract of muscle were enhanced in 50 mg/kg and 75 mg/kg L carnitine treated groups( P <0.05), and the content of myoglobin of muscle was increased in the 50 mg/kg group( P <0.05).
L carnitine supplemented more than 50 mg/kg increased the percentage of breast, decreased the percentage of abodominal fat and the subcutaneous fat score ( P <0.05)by slaughter trial.
An enzyme, L carnitine dehydratase, inducible intracellular enzyme produced under partial anaerobic conditions by adding trans cronobetaine in the medium,was responsible to the catalysis.
In the experiment of Penaeus vannamei, with the supplementation of 200mg/kg and 300mg/kg of L-carnitine, the lipid contents of whole body were decreased significantly from 7.09% (control group) to 6.04% and 5.72% respectively (P<0.05).
In the trial of Penaeus monodon, the lipid content of whole body decreased significantly from 4.69% (control group) to 3.47% and 3.55% respectively with supplementation of 300mg/kg DL-carnitine or L-carnitine (P<0.05).
DL-carnitine and L-carnitine were added with different supplement doses (0, 100mg/kg, 200mg/kg, 300mg/kg diet) in the shrimp Penaeus monodon and L-carnitine with different supplement doses (0, 50mg/kg, 100mg/kg, 200mg/kg, 300mg/kg diet) in the diet of shrimp of Penaeus vannamei.
The results showed that dietary L-carnitine supplementation had no significant effect on broilers' performance, but the mortality due to ascites was significantly reduced(P<0.05).
carnitine content of microorganism cells. The optimal conditions were established. Results indicated that the method was accurate,reliable and convenient.
The results were as follows:Chromium or Lcarnitine had no significant effect on growth performance of broiler chickens (P>005), but adding 600 μg/kg chromium or 100 mg/kg Lcarnitine alone can regulate fat and cholesterol metabolism better,and there was greater influence at the end of experiment. Both them had almost same effect for most of index about lipid metabolism.
L-cartinine is an important functional factor and plays a vital role in metabolism of long-chain fatty acids of mammals. The range of applications of L-cartinine in pharmaceuticals, food and feed industry are widening and demand increasing.
L 肉碱是重要的功能因子 ,在哺乳动物长链脂肪酸代谢等方面起着关键作用 ,在医药、食品和饲料工业等方面的应用愈发广泛。
Preparation of L-cyrnitine hydrochloride from L-cyano-carnitine chloride was studied. It was found that the side reaction of dehydration could be avoided, and the yield and purity of product could be raised under the conditions of lower reaction temperature and longer reaction time.