Comprehensive Evaluation of Lilium davidii var. willmottiae (E. H. Wilson) Raffill Quality Based on Sensory Evaluation and Chemometrics

By exploring the quality differences of Lilium davidii var. willmottiae (E. H. Wilson) Raffill from different origin and different specifications, the comprehensive evaluation system of L. davidii var. willmottiae was preliminarily established to provide a theoretical basis for the quality improvement of L. davidii var. willmottiae. Six samples of L. davidii var. willmottiae were used as materials to score sensory indexes and determine the contents of soluble solid, moisture, sucrose and other chemical composition indexes. Then the sensory evaluation and chemical component indexes of L. davidii var. willmottiae from different origin and different specifications were processed by Pearson correlation analysis, principal component analysis and orthogonal partial least squares-discriminant analysis. The results of sensory evaluation showed that the evaluator's overall preference was closely related to sweetness and freshness (P<0.05), and the sweetness, freshness and overall preference scores of the large-size L. davidii var. willmottiae from Qilihe District were higher than those of the rest of the samples, which were more preferred by the evaluators. The chemical composition analysis found that there were significant differences in the chemical composition content of L. davidii var. willmottiae from different origin and different specifications (P<0.05), 7 core indexes were selected by factor analysis. Pearson correlation analysis showed that astringency and bitterness were significantly correlated with protein and amino acid content (P<0.05), brittleness and sweetness were significantly correlated with soluble solid content (P<0.05), odor, aroma and general preference were significantly correlated with sucrose and polyphenol content (P<0.05). The results of orthogonal partial least squares-discriminant analysis showed that there was a certain correlation between the sensory indexes and the chemical constituents of L. davidii var. willmottiae. The results of 6 quality ranking of L. davidii var. willmottiae showed that the quality of L. davidii var. willmottiae was better in Qilihe District and Yuzhong County. The results of this study preliminarily revealed the relationship between the sensory indexes and the chemical composition indexes of L. davidii var. willmottiae, and provided theoretical reference for the further evaluation of the quality of L. davidii var. willmottiae from different places and different specifications.