To investigate the effect of bagging on the fruit quality of ‘Honghuayingzui’ peach, gas chromatography-tandem mass spectrometry (GC-MS/MS) was used to analyze the metabolite profiles of bagged and unbagged peach fruits. The results showed a total of 634 metabolites were identified, including 11 sugars, 33 free fatty acids, and 590 volatile compounds. Among these, 107 significantly differential metabolites were identified, including 59 up-regulated substances and 48 down-regulated substances. Compared with the non-bagged group, the bagged fruit exhibited improved appearance quality and significantly reduced contents of sorbitol and oleic acid (P < 0.05). Additionally, the bagged fruit had a greater diversity of volatile compounds, with a weakened green aroma but enhanced floral, fruity and sweet aromas. However, no significant differences (P > 0.05) were observed in sweetness, total sugar, total free fatty acid, or total volatile compound contents. This study provides an important theoretical basis for improving the quality of bagged peach fruit.

To understand the composition and dynamic changes of primary metabolites in ‘Fuhong’ plum fruits during refrigeration, the primary metabolite profile of ‘Fuhong’ plum fruits stored at 4 ℃ for 0, 30, and 60 days was analyzed using ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Differential metabolites were selected by orthogonal partial least squares-discriminant analysis (OPLS-DA) and subjected to pathway enrichment analysis. The results showed that a total of 573 metabolites were identified, including sugars, organic acids, amino acids and their derivatives, lipids, and nucleotides. There was a significant difference in primary metabolite profile between the three storage times, and 95 differential metabolites at day 30 vs. 0, 99 differential metabolites at day 60 vs. 30, and 173 differential metabolites at day 60 vs. 0 were identified. The pathway enrichment analysis showed that the major metabolic pathways with a significant difference included linoleic acid metabolism, unsaturated fatty acid biosynthesis, propionic acid metabolism, sulfur metabolism, purine metabolism, nucleotide metabolism, cysteine and methionine metabolism. This study provides a theoretical basis for the quality evaluation and postharvest preservation of ‘Fuhong’ plum fruits.