# Characteristic Volatile Composition of Seven Seaweeds from the Yellow Sea of China
## 2 Results and Discussion
### Headspace VOC Composition of Saweeds
#### 2.1.1 Headspace VOC Composition of Rhodophyta
** & **Compound** & **Molecular** & **Compound Class** & **RI\({}^{\star}\)** & & & **Area Percentage (\%)** & & **Identification** \\  & & **Formula** & **Compound Class** & **RI\({}^{\star}\)** & **GF\({}^{\star}\)** & **PS\({}^{\star}\)** & **CC\({}^{\star}\)** & **IC\({}^{\star}\)** & **MS** \\ \hline
**1** & (_E,E,E_)-2,4,6-Octatriene \({}^{\text{T}}\) & C\({}_{8}\)H\({}_{2}\) & Alkene & \(<\)800 & 1.03 \({}^{\star}\) & 0.00 & 0.00 & MS \\
**2** & 3,5,5-Trimethyl-1-hexene \({}^{\text{T}}\) & C\({}_{9}\)H\({}_{18}\) & Alkene & \(<\)800 & 8.24 \({}^{\star}\) & 1.74 \({}^{\star}\) & 2.74 \({}^{\star}\) & MS \\
**3** & 3,5-Dimethyl-1-hexene \({}^{\text{T}}\) & C\({}_{8}\)H\({}_{6}\) & Alkene & \(<\)800 & 0.36 \({}^{\star}\) & 0.00 & 0.00 & MS \\
**4** & 1-Hexene-3-ol \({}^{\text{T}}\) & C\({}_{9}\)H\({}_{20}\) & Alcohol & \(<\)800 & 19.58 \({}^{\star}\) & 0.00 & 4.44 \({}^{\star}\) & MS \\
**5** & 2-Propyl-furan \({}^{\text{T}}\) & C\({}_{7}\)H\({}_{20}\) & Furan derivative & \(<\)800 & 0.30 \({}^{\star}\) & 1.02 \({}^{\star}\) & 0.00 & MS \\
**6** & 3-Ethyl-1,4-hexadiene \({}^{\text{T}}\) & C\({}_{8}\)H\({}_{4}\) & Alkene & 846 & 1.16 \({}^{\star}\) & 1.25 \({}^{\star}\) & 0.00 & MS \\
**7** & 2-Methylpropyl-cleene & C\({}_{9}\)H\({}_{6}\) & Alkene & 908 & 1.48 \({}^{\star}\) & 0.00 & 0.00 & MS, RI \\
**8** & (Z)-2-Octen-1-ol \({}^{\text{T}}\) & C\({}_{8}\)H\({}_{6}\)O & Unsaturated & 927 & 8.5 \({}^{\star}\) & 0.00 & 0.00 & MS \\
**9** & Isocumene & C\({}_{9}\)H\({}_{2}\) & Others & 931 & 0.00 & 1.67 \({}^{\star}\) & 0.00 & MS, RI \\
**10** & 3-Cyclobenzene-1-ethanol & C\({}_{9}\)H\({}_{3}\)O & Alcohol & 935 & 2.90 \({}^{\star}\) & 0.00 & 0.00 & MS, RI \\
**11** & (F)-2-Heprenal & C\({}_{7}\)H\({}_{20}\) & Aldehyde & 960 & 4.78 \({}^{\star}\) & 1.51 \({}^{\star}\) & 0.00 & MS, RI \\
**12** & 1-Octen-3-ol \({}^{\text{S}}\) & C\({}_{9}\)H\({}_{6}\)O & Alcohol & 980 & 18.72 \({}^{\star}\) & 0.00 & 2.15 \({}^{\star}\) & MS, RI \\
**13** & 3,7-Dimethyl-1-octene \({}^{\text{T}}\) & C\({}_{10}\)H\({}_{20}\) & Alkene & 985 & 0.00 & 0.00 & 7.81 \({}^{\star}\) & MS \\
**14** & 2,7-Octaden-1-ol \({}^{\text{T}}\) & C\({}_{3}\)H\({}_{4}\)O & Alcohol & 986 & 8.39 \({}^{\star}\) & 0.00 & 0.00 & MS \\
**15** & 4-Methyl-2-propyl-1-pentanol \({}^{\text{T}}\) & C\({}_{9}\)H\({}_{20}\)O & Alcohol & 990 & 0.00 & 0.00 & 3.59 \({}^{\star}\) & MS \\
**16** & 5-Methyl-1-undecene \({}^{\text{T}}\) & C\({}_{12}\)H\({}_{20}\) & Alkene & 1025 & 0.00 & 6.91 \({}^{\star}\) & 12.70 \({}^{\star}\) & MS \\
**17** & (E)-2-Dudecen-1-ol \({}^{\text{T}}\) & C\({}_{11}\)H\({}_{20}\) & Unsaturated & 1039 & 0.25 \({}^{\star}\) & 1.28 \({}^{\star}\) & 0.00 & MS \\
**18** & (\(\beta\)2)-1,9-Dodecadiene \({}^{\text{T}}\) & C\({}_{12}\)H\({}_{22}\) & Alkene & 1092 & 0.00 & 0.00 & 1.77 \({}^{\star}\) & MS \\
**19** & Etocarpene \({}^{\text{T}}\) & C\({}_{11}\)H\({}_{18}\) & Alkene & 1105 & 0.00 & 21.83 \({}^{\star}\) & 14.71 \({}^{\star}\) & 0.00 & MS \\
**10** & 1-Indecyne \({}^{\text{T}}\) & C\({}_{11}\)H\({}_{20}\) & Alkene & 1108 & 0.0