## Results and Discussion  
### Selection of SPME Arrow Fibers  
SPME Arrows can be used to extract the same amounts of volatile compounds twice as fast as SPME fibers [21]. Therefore, this study was conducted using the SPME Arrow method to analyze the volatile compounds present in _C. seidens_ Nakai. A total of 58 volatile compounds were extracted and identified using four commercial sorbent-coated (100 \(\upmu\)m PDMS, 100 \(\upmu\)m, 120 \(\upmu\)m DVB/PDMS, and 120 \(\upmu\)m CWR/PDMS) SPME Arrows. Identified volatile compounds belonged to the following groups: alcohols (6 compounds), aldehydes (12 compounds), aliphatic hydrocarbons (14 compounds), esters (1 compound), furans (4 compounds), ketones (8 compounds), nitro (3 compounds), nitrate (1 compound), pyrazines (2 compound), and terpenes (7 compounds) (Table 1). Figure 2 shows the peak area of each chemical class of the volatile compounds extracted from _C. seidens_ Nakai. Our results showed that the extracted volatile compounds were different for the different SPME Arrows varying in the chemical nature of the sorbent. Among the four different sorbent coatings of the SPME Arrows used (CWR/PDMS, DVB/PDMS, PDMS, PA), the highest concentrations of the volatile components were captured using the one coated with CWR/PDMS, as represented by the highest peak area values (10,122.27 \(\times\) 10\({}^{6}\)). The CWR/PDMS-coated SPME Arrows extracted 52 types of volatile compounds in high amounts as detected from the peaks that appeared. The second highest amount of volatile components was obtained from DVB/PDMS film extraction (peak area value \(7322.79\times 10^{6}\)). In contrast, a much lower peak area of the 52 volatile compounds was extracted using the PDMS and PA SPME Arrows. The CWR/PDMS-coated SPME Arrows extracted various types of volatile components that included extractions of components with low KI to high KI, with low-KI components being extracted more efficiently than that with the other SPME Arrows coated with different films. The DVB/PDMS-coated SPME Arrows also extracted volatile compounds with a wide range of polarities. Compared with that of the CWR/PDMS-coated SPME Arrow, the DVB/PDMS-coated SPME Arrow showed a relatively lower extraction of low-KI compounds, such as aldehydes. The SPME Arrow coated with PDMS extracted 37 volatile compounds with peak area values of \(2346.02\times 10^{6}\), whereas the PA-coated SPME Arrow identified only 26 volatile compounds with peak area values of \(2831.80\times 10^{6}\). The smallest number of volatile compounds was extracted using the PA-coated SPME Arrows and the lowest amounts of volatile compounds were extracted using SPME Arrows coated with PDMS. SPME Arrows coated with non-polar PDMS detected most of the aliphatic hydrocarbons with low polarity, such as 2,2,4,6,6-Pentamethylheptane, 2,3,6,7-Tetramethyl octane, and 5-Ethyl-2,2,3-trimethylheptane. Most of the terpen were also extracted by the PDMS-coated SPMEArrow. However, PDMS was hardly able to extract volatile compounds belonging to other chemical classes and extracted the least number of volatile compounds among the four different sorbents used in this study. Arrows coated with polar films, such as PA, extracted small amounts of volatile compounds. \(\beta\)-Cyclocitral was detected in extremely high abundance from PA fibers; however, aliphatic hydrocarbons with low polarity were detected at very low abundance from PA fibers. Most compounds belonging to the class of aliphatic hydrocarbons, including octane, 2-ethyl-1-hexene, 2,2,6-trimethyloctane, and others, were not detected. Therefore, PA- and PDMS-coated SPME Arrows extracted smaller amounts of volatile compounds compared with those with CWR/PDMS- and DVB/PDMS-coated SPME Arrows.