Aromatics Determination of Xinbai 8 Loquat by HS-SPME Internal Standard Method
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摘要:
目的 探究新白8号枇杷香气成分及内标物的最适浓度,以期为白肉枇杷香气成分的研究及内标选择提供依据。 方法 以白肉枇杷新白8号果实为试材,加入4种不同浓度等体积的环己酮溶液(947、94.7、9.47、0.947μg·μL-1)为内标,采用HS-SPME-GC/MS技术,对试材的香气成分进行定性和定量分析。 结果 新白8号枇杷果肉中共检测出10类43种香气成分,以醛类、烷烃、芳香烃、酮类和醇类为主,其中相对含量较高的物质有己醛、(E)-2-己烯醛、正丁基环己烷、2-庚酮、正戊基环己烷、(E)-2-己烯-1-醇,苯乙烯等。4种环己酮浓度的样品分别检测出有效香气化合物为30、39、41和32种,有效峰面积占总峰面积比分别为38.20%、28.49%、42.70%和39.51%;环己酮峰面积比分别为47.38%、58.55%、36.37%和25.86%。加入9.47 μg·μL-1环己酮的样品检测出的香气物质种类最多、有效峰面积比最高、环己酮及各香气成分峰面积占比适宜。 结论 新白8号香气成分丰富多样,9.47 μg·μL-1环己酮为枇杷果实香气成分固相微萃取的适宜内标浓度。 Abstract:Objective To determine the aromatic composition of loquat fruit and cyclohexanone concentration for the HS-SPME-GC/MS internal standard method. Methods The pulp of Xinbai 8 fruits was added with a cyclohexanone solution in the concentration of 947, 94.7, 9.47, 0.947 μg·μL-1 at a same volume as the internal standard for HS-SPME-GC/MS analysis. Results The analysis detected 10 classifications of chemicals including aldehydes, alkanes, dutrex, ketones and alcohols. Hexanal, (E)-2-hexenal, n-butyl cyclohexane, 2-heptanone, n-pentyl cyclohexane, (E)-2-hexene-1-alcohol, and styrene were the dominating volatiles among the 43 compounds identified.In the cyclohexanone-added samples, the decreasing concentration produced 31, 40, 42 and 33 aromatic substances with the effective peak area ratios of 38.20%, 28.49%, 42.70% and 39.52%, and the peak area ratios of 38.20%, 58.55%, 36.37% and 25.86%, respectively. A maximum number of aromatics was found in the sample that was added with 9.47 μg·μL-1 cyclohexanone which also had the highest effective peak area ratio and optimum peak area radio. Conclusion The aromatics in the fruits of Xinbai 8 were diverse, and the cyclohexanone concentration at 9.47 μg·μL-1 was the choice internal standard for the analytical. -
Key words:
- loquat /
- aromatics /
- cyclohexanone /
- internal standard /
- SPME /
- GC-MS
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表 1 新白8号果实香气主要成分的相对含量
Table 1. Relative content of aromatics in fruits of Xinbai 8
编号
No.化学成分
Components相对含量Relative content/(ng·g-1 FW) ×1环己酮
Cyclohexanone×10环己酮
Cyclohexanone×100环己酮
Cyclohexanone×1000环己酮
Cyclohexanone酯类Esters 1 2-甲基丁酸甲酯methyl 2-methylbutyrate - - - 0.10 2 甲酸环己酯Formic acid, cyclohexyl ester 901.57 84.85 18.76 - 3 乙酸环己酯Acetic acid, cyclohexyl ester - 3.37 0.56 - 4 顺式-3-己烯醇乳酸酯cis-3-Hexenyllactate 36.35 - - - 醇类Alcohol 5 1-甲基环己醇1-MethyLcyclohexanol 339.30 49.95 6.77 0.35 6 正己醇1-Hexano 178.37 85.49 17.66 2.94 7 (Z)-3-己烯醇3-Hexen-1-ol, (E)- 52.04 22.05 4.55 0.52 8 (E)-2-己烯-1-醇2-Hexen-1-ol, (E)- - 141.39 34.64 5.32 9 2-乙基己醇1-Hexanol, 2-ethyl- 57.17 8.45 2.08 0.36 10 正辛醇1-Octanol 48.93 11.68 2.10 0.34 11 新薄荷醇(1R)-(+)-neomenthol - - 5.28 - 12 戊乙二醇Pentaethylene glycol 98.08 38.10 0.78 0.20 酮类Ketones 13 3-庚酮3-Heptanone 331.77 38.12 5.44 - 14 2-庚酮2-Heptanone 8144.71 503.82 65.1 1.93 15 环戊基乙酮Ethanone, 1-cyclopentyl- 96.90 10.76 1.49 - 16 2-甲基环戊酮Cyclohexanone, 2-methyL- 634.71 72.03 8.41 - 17 甲基庚烯酮5-Hepten-2-one, 6-methyL- 78.23 16.85 2.98 0.34 18 2-环己烯酮2-CycLohexen-1-one 415.65 22.48 3.48 0.51 19 苯乙酮Acetophenone - 3.50 0.52 0.14 20 1.4-环己二酮2-Cyclohexene-1, 4-dione - - 1.10 0.23 21 香叶基丙酮Geranylacetone - 12.46 2.60 - 22 β-紫罗酮Beta-Ionone 168.23 12.12 2.47 0.69 烷烃Alkane 23 正丁基环己烷Cyclohexane, butyl- 19873.41 278.97 156.65 0.48 24 正戊基环己烷Cyclohexane, pentyl- 15890.51 207.81 104.70 0.93 25 环十二烷Cyclododecane - 4.38 0.70 0.18 醛类Aldehyde 26 己醛Hexanal 4908.29 1295.02 301.00 74.94 27 (E)-2-己烯醛2-HexenaL, (E)- 7896.42 1569.74 382.22 55.98 28 环己基甲醛Cyclohexane carboxaldehyde 111.95 8.48 1.86 - 29 壬醛Nonanal 228.65 34.57 6.01 1.12 30 (E.E)-2.4-庚二烯醛2, 4-Hexadienal, (E, E)- 580.28 23.18 6.58 1.12 31 癸醛Decanal 126.22 16.45 2.37 0.70 32 苯甲醛Benzaldehyde 148.86 10.08 2.54 0.51 33 β-环柠檬醛Beta-cyclocitral - 5.92 0.97 0.22 酸类Acid 34 乙酸Acetic acid 70.98 4.96 1.11 0.28 35 2-甲基丁酸Butanoic acid, 2-methyl- - 4.72 1.37 0.35 36 己酸Hexanoic acid 201.78 20.25 5.81 1.50 37 (E)-2-己烯酸2-Hexenoic acid, (E)- - 30.07 5.74 1.71 酚类Phenol 38 2, 6-二叔丁基对甲酚Butylated hydroxytoluene - 43.68 5.89 2.89 醚类Ether 39 三乙二醇单乙醚Ethanol, 2-(2-ethoxyethoxy)- 398.08 4.19 9.78 2.20 芳香烃Aromatic hydrocarbon 40 苯乙烯Styrene 3442.55 111.46 20.67 0.62 41 乙苯Ethylbenzene 2264.31 43.77 14.90 - 42 对二甲苯p-Xylene 17089.28 249.82 15.61 - 其他Others 43 2-乙基呋喃Furan, 2-ethyl- - 15.09 1.97 0.11 相对总含量The relative total content 84813.58 5120.08 1235.22 160.81 累计有效峰面积All of effective peak area 7.37×109 4.18×109 3.99×109 1.58×109 有效峰面积/总峰面积 38.20% 28.49% 42.70% 39.51% The proportion of effective and total peak area 环己酮峰面积The peak area of cyclohexanone 9.14×109 8.58×109 3.40×109 1.06×109 注:“-”表示未检测到。
Note:“-” indicates undetected. -
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