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. 2021 Jun 29;8:694649. doi: 10.3389/fnut.2021.694649

Figure 1.

Figure 1

(A) A score plot of principal component analysis (unsupervised) based on a Waters Synapt G2 Quadrupole time-of-flight (QTOF) mass spectrometer (MS), hyphenated to a Waters Aquity ultra-performance liquid chromatograph (UPLC) (UPLC–Q-TOF/MS) spectra (phenolic metabolic analysis) of the leaves of var. Butternut squash (Cucurbita moschata) that underwent five different postharvest drying treatments. PC1 = 28.50% and PC2 = showing 22.5% of the leaves of three different pumpkin species. Each postharvest-drying treatment included three replicate samples. OD, oven drying; MD, microwave drying; SD, sun-drying; SOD, solar drying; FD, freeze-drying. (B) A score plot of orthogonal partial least squares discriminant analysis of UPLC–QTOF/MS spectra of the leaves of var. Butternut squash (Cucurbita moschata) subjected to different postharvest drying treatments. Each sample set includes three replicates. m/z 371.05997, 2-O-caffeoylglucaric acid (2-o.c); m/z 609.1441 quercetin 3-galactoside 7-rhamnoside (q-3-g-7- r); m/z 463.08 quercetin 3-galactoside (q-3-g); m/z 623.16 isorhamnetin-3-galactoside-6″-rhamnoside. isorhamnetin-3-galactoside-6″-rhamnoside (is-g-6-r).