34 results about "Aminoacid analyzer" patented technology

The invention discloses a method for detecting sulfur-containing amino acid. The method comprises the following steps of: oxidizing cystine and methionine and preparing cysteic acid and metson by acid hydrolysis; adding a derivatization reagent of 2,4-dinitrofluorobenzene to the cysteic acid and the metson for derivatization reaction to generate products having the function of ultraviolet absorption; and performing highly efficient liquid phase chromatographic analysis of the derivatives. The method has the advantages that: the amino acid analyzer with high price is unnecessary; the operationis simple; the detection cost is low; and the accuracy and the sensitivity are high.

The invention relates to a method for building a konjak finger print; the method adopting a high efficiency liquid phase chromatography includes the following steps: (a) the preparation of a sample: konjak tissues are taken for deactivation of enzymes, drying and trituration and then weighed in a test tube, and the constant volume and filter of the konjak tissues are made by purified water, and the sample undergoes the pre column derivation according to the analysis method for plant amide acids; (b) chromatogram conditions: the high efficiency liquid phase chromatograph or the amino acid analyzer is used, and the chromatographic column uses the octadecylsilane chemically bonded silica as fillers; (c) the detection: the sampling solution is precisely sucked and injected in the high efficiency liquid phase chromatograph, and the finger print is detected and obtained according to the high efficiency liquid phase chromatography. By analyzing the relation between characteristic peaks in the finger print and the breed, the quality, the resistance, the output and the growth state, etc. of the konjak, the invention can provide technical directions for scientific efforts such as the collection and classification of the konjak resource, the breeding selection of new breeds and the research of novel amino acid pesticides for controlling konjak diseases, etc.

The invention discloses a method for identifying fermented type and formulated type yogurt beverages. Yogurt beverage is precipitated by sulfosalicylic acid, the content of free amino acids in liquid supernatant is measured by an amino acid analyzer, and the content ratios of four characteristic amino acids-alanine, valine, lysine and proline of total free amino acids are judged to establish the amino acid analysis method for identifying fermented type and formulated type yogurt beverages. According to the method, the similarity of the fermented type and formulated type yogurt beverages in the aspects of mouthfeel and physical behavior is avoided, the difference of the contents of the free amino acids of the fermented type and formulated type yogurt beverages is fully utilized, and a problem that the fermented type and formulated type yogurt beverages cannot be rapidly identified is solved; and the identification method can be operated simply and conveniently and has high accuracy and good application prospect.