| Objective To evaluate the nutritional value of amino acid contents in Dendrobium devonianum Paxt. from different sources. Methods The amino acid analyzer method was used to determine the amino acid content of Dendrobium devonianum Paxt., and the amino acid nutritional value was evaluated by multivariate statistical analysis methods. Results The total amino acid content in 29 samples ranged from 42.00 to 125.40 mg/g; the essential amino acid content ranged from 16.80 to 44.60 mg/g; the contents of aspartic acid, glutamic acid, leucine and arginine were the most abundant, which were 11.18 mg/g, 9.97 mg/g, 6.91 mg/g and 5.52 mg/g respectively, and could be used as the characteristic amino acids of Dendrobium devonianum Paxt.. The contents of cystine (0.92 mg/g) and methionine (1.10 mg/g) were the first and second limiting amino acids respectively; according to the amino acid pattern spectrum standards of the Food and Agriculture Organization of the United Nations/World Health Organization (FAO/WHO), the nutritional value of Dendrobium devonianum Paxt. cultivated in greenhouse substrates in Lianghe area (Essential amino acid/Non-essential amino acid, EAA/NEAA was 62.69-77.21%; EAA/TAA was 38.63-43.55%) and wild varieties (EAA/NEAA was 61.59-65.43%; EAA/TAA was 38.12-39.56%) was the highest and more in line with human needs; According to the comprehensive score ranking in the quality evaluation model, the value of the samples from Mangshi M10, M1, M7 and Longling L4, L5 were higher. Two principal components were extracted by principal component analysis, and the cumulative contribution degree was 83.852%, and a quality evaluation model of Dendrobium devonianum Paxt. was established. Cluster analysis was carried out with amino acids and comprehensive scores as variables, and all samples could be divided into three major categories. Conclusion The amino acids of Dendrobium devonianum Paxt. is rich in nutrients, and the amino acid content of Dendrobium devonianum Paxt. from different sources varies. This study provided an important theoretical basis for the development and utilization of the nutritional value of Dendrobium devonianum Paxt.. At the same time, it was recommended to pay attention to the origin and cultivation methods of Dendrobium to enhance its market value. |
