# Influence of Electrohydrodynamics on the Drying Characteristics and Volatile Components of Ginger
## 3 Results and Discussion
### Statistical Analysis  
By normalizing the experimental data and plotting the relevant cyclic heatmap (Figure 10), we can better analyze the drying characteristics of ginger. These data include average drying rate, average drying time, effective water diffusion coefficient, rehydration rate, color difference, shrinkage rate, a*, b*, and L*. According to Figure 10, the correlation coefficients of average drying rate, shrinkage, b*, color difference, and effective water diffusion coefficient are the largest in the 30 kV treatment group; the a* correlation coefficient is the largest in the 20 kV group; and the correlation coefficient of average drying time is the largest in the control group. The results showed that the ginger dried at 30 kV had the best comprehensive quality.  
Figure 9: Analysis of volatile components in finger under different voltage drying conditions. (**a**): Principal component analysis of dried finger at different voltages; (**b**): OPLS-DA of finger under different drying voltages; (**c**): 200 placement tests; (**d**): VIP value.  
Figure 11 shows a clustered heat map for screening differential volatiles in finger under various drying settings. The relationships between various individuals in the clustered samples are shown. The vertical axis displays 36 distinct volatile chemicals (VIP \(>\) 1, \(p\) \(<\) 0.05), whereas the horizontal axis represents various drying voltages. The 36 differentially volatile substances (VIP \(>\) 1, \(p\) \(<\) 0.05) were screened. The following compounds have been identified: Rhammol, \(\alpha\)-Cadarenol, \(\gamma\)-Pinene, 2-Methoxy-1,7,7-trimethylbicyclo[2.2.1]heptane, Carbon, 9,10-Dehydrocyclic, Decahydro-2-naphthaleneemethanol, 1-vinyl-1-methyl-2,4-dicyclohexane, 4-vinyl-alpha-cyclohexanemethanol, trans-Sedum, p-Toluc, \(\beta\)-Opulinone, 1-(6,6-Dimethylbicyclo[3.1.0]methylene)ethanone, Andrographolide, 2,7-Octadien-1-ol, 2-Methylene-3-(1-methylethenyl)cyclohexanol, Linalool, 3-Vinyl-3-methyl-2-(1-methylethyl) cyclohexanol, \(\alpha\)-Hydrocylethylene, 1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol, endoborn, \(\alpha\)-Muurolene, 1H-cyclopropan[a]naphthalene, \(\tau\)-Cardanol, Ultramarine, (E)-2-Hexen-1-ol, 3-Hydroxy-3-methylpentanoic, (1 aR,4S,4 aR,7R,7 aS,7 bB)-1,1,4,7-tetramethyl, 2-((3,3-dimet) hypoxpropan-2-yl)methyl)-3-methyl-2-butenol, 1,7,7-trimethylbicyclo[2.2.1]hept-2-acetic, decahydro-4a-methyl-1-methylnaphthalene, 2,6-dimethyl-6-methylenebicyclo[3.1.1]hept-2-ene, 2-carene, (1 aR,3 aS,7S,7 aS,7 bB)-1,1,3a,7-tetramethyl-something, and 2-Nonanone.  
Figure 11: Hierarchical clustered heat map of differential volatiles in finger at different drying voltages.  
Figure 10: Clustered heat map of different drying voltages versus drying indices.  
At 30 kV, 4-vinyl-alpha-cyclohexanemethanol, \(\alpha\)-Muurolene, and decahydro-4a-methyl-1-methylnaphthalene all showed a positive correlation. The hierarchical chemical clustering demonstrates that the clustering of 36 different volatile chemicals reveals a link between ginger at different drying voltages. It is worth noting that the difference in volatile matter content can effectively distinguish dried ginger products.