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中国精品科技期刊2020

玛瑙红樱桃果实不同发育阶段香气成分分析

田竹希, 龙明秀, 李咏富, 何扬波, 梁倩, 石彬, 罗其琪

田竹希,龙明秀,李咏富,等. 玛瑙红樱桃果实不同发育阶段香气成分分析[J]. 食品工业科技,2022,43(7):333−342. doi: 10.13386/j.issn1002-0306.2021080140.
引用本文: 田竹希,龙明秀,李咏富,等. 玛瑙红樱桃果实不同发育阶段香气成分分析[J]. 食品工业科技,2022,43(7):333−342. doi: 10.13386/j.issn1002-0306.2021080140.
TIAN Zhuxi, LONG Mingxiu, LI Yongfu, et al. Study on Aroma Constituents of Manaohong Cherry Cultivar at Different Development Stages[J]. Science and Technology of Food Industry, 2022, 43(7): 333−342. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021080140.
Citation: TIAN Zhuxi, LONG Mingxiu, LI Yongfu, et al. Study on Aroma Constituents of Manaohong Cherry Cultivar at Different Development Stages[J]. Science and Technology of Food Industry, 2022, 43(7): 333−342. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021080140.

玛瑙红樱桃果实不同发育阶段香气成分分析

基金项目: 贵州省科技计划项目(黔科合支撑[2020]1Y160);贵州省农业科学院青年科技基金项目(黔农科院青年基金[2018]21号);贵州省基础研究计划项目(重点项目)(黔科合基础[2018]1420)。
详细信息
    作者简介:

    田竹希(1992−),女,硕士,助理研究员,研究方向:农产品加工与贮藏保鲜,E-mail:tzx-victory@163.com

    通讯作者:

    李咏富(1985−),男,博士,副研究员,研究方向:农产品加工与贮藏保鲜,E-mail:liyongfu1985@163.com

  • 中图分类号: TS255.2

Study on Aroma Constituents of Manaohong Cherry Cultivar at Different Development Stages

  • 摘要: 为探究玛瑙红樱桃果实发育过程中香气物质的组成和变化,采用顶空固相微萃取-气相色谱-质谱联用技术对绿熟期、着色期、商熟期和完熟期的挥发性香气成分进行了鉴定,并利用相对气味活度值ROAV评价各香气成分对樱桃果实香气的贡献,以确定关键香气物质。在4个不同发育时期,共检测出114种物质。其中,在绿熟期、着色期、商熟期和完熟期分别检出79、77、44和53种香气物质。绿熟期相对含量最高的是醇类物质,着色期、商熟期和完熟期相对含量最多的均是醛类物质。醛类物质从绿熟期开始便持续不断合成,直至商熟期达到最高值,至完熟期时又略微下降。与之相反的是,酯类物质和醇类物质在果实绿熟期和着色期大量合成,至果实商熟期时骤减至最低值,至完熟期时又略微回升。芳香醛类、C6醛类和C6醇类是构成玛瑙红樱桃最主要的香气组分,相对含量分别占挥发性物质总量的66.22%~96.70%。通过ROAV评价方法,共鉴定出20种关键香气成分,其中壬醛、芳樟醇、己醛是玛瑙红樱桃果实最重要的关键香气成分。具有青香的顺-3-己烯醛是唯一出现在商熟期的特征性关键香气成分。
    Abstract: To explore the component and content of aroma constituents in Manaohong cherry during development, volatile components were determined by headspace solid phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) technology at green stage, color stage, commercial stage and ripe stage. Relative odor activity value (ROAV) was used for evaluating the contribution of aroma components, in order to determine the key aroma substances. A total of 114 substances were detected at four stages. Among them, 79, 77, 44 and 53 aroma components were detected at green stage, color stage, commercial stage and ripe stage, respectively. The highest relative content was alcohols at green stage. At color stage, commercial stage and ripe stage, the highest relative content was aldehydes. Aldehydes were synthesized continuously from green stage to the maximum value at commercial stage, and then decreased slightly at the ripe stage. On the contrary, esters and alcohols were synthesized during the green and color stages, and decreased to the lowest value at the ripe stage, and then increased slightly at ripe stage. Aromatic aldehydes, C6 aldehydes and C6 alcohols were the most important aroma components of Manaohong cheery, and their relative contents account for 66.22%~96.70% of the total aroma-active compounds. According to ROAV, a total of 20 key aroma components were identified, among which nonanal, linalor and hexanal were the most important ones in Manaohong cherry. (Z)-3-hexenal with green flavor was the only characteristic key aroma component that appeared at commercial stage.
  • 樱桃(Prunus avium L.)为蔷薇科李属樱桃亚属植物,其外形美观、口感甘甜,且成熟期早,被誉为“早春第一果”[1]。香气是客观反映水果果实风味、成熟度和商品品质的重要指标[2],直接决定着果实及其加工品的感官品质和市场接受度,近年来已成为水果品质研究的重要热点。目前已知苹果有超过300种香气物质被鉴别出来[3],草莓有350种[4],芒果有270多种[5],番茄有400多种[6],香蕉有150多种[7]。樱桃果实香气浓郁且独特,有关其挥发性物质组成的研究受到广泛关注。Mattheis等[8]从宾库樱桃中共检出28种香气成分,主要由2-丙醇、苯甲醛、己醛等物质组成。Legua等[9]从洛里、布鲁克斯和先锋等不同品种樱桃中鉴定出31种香气成分,其中苯甲醛(22.10%)、苯甲醇(20.80%)和丁香酚(9.50%)是主要香气成分。Girard等[10]认为己醛、(E)-2-己烯醛、(E)-2-己烯醇和苯甲醛是樱桃果实最重要的香气成分。事实上,果实香气组成与含量在不同发育阶段明显不同。关于草莓[11-12]、葡萄[13-14]、杏[15-16]、梨[17-18]等果实发育进程中的香气组成及变化规律的研究已有较多报道。而樱桃果实香气研究主要集中在不同品种间香气成分的比较,对于樱桃果实不同生长发育期之间香气成分变化的研究则较少。张序[19]研究显示,己醛、(E)-2-己烯醛、苯甲醛、(E)-2-己烯醇、乙酸乙酯、己酸乙酯是红灯樱桃成熟果实的特征香气成分,这些物质在着色期大量合成,在商熟期达到高峰,完熟期出现大量乙醇,风味变劣。

    玛瑙红樱桃是贵州省毕节地区自主培育的地方优良早熟品种,果形椭圆,果色鲜红,果肉厚重,有“中国南方樱桃之王”之称。本研究拟通过对玛瑙红樱桃果实不同发育期的香气成分进行定性定量检测,研究发育过程中香气组分及含量的变化情况,为探讨玛瑙红樱桃香气代谢机制提供理论依据。

    玛瑙红樱桃 贵阳市乌当区下坝乡岩山村果园(分别在樱桃果实的绿熟期、着色期、商熟期和完熟期进行采样,每次取样时间为上午9:30~10:00,采后用保鲜盒盛装常温下2 h运回实验室进行洗净脱核备用);环己酮、壬酸甲酯 阿拉丁公司。

    HP6890/5975C气相-质谱联用仪 美国安捷伦公司;2 cm-50/30 µm DVB/CAR/PDMS固相微萃取纤维及萃取手柄 美国Supelco公司。

    取混匀研碎樱桃果肉5 g,加入2 µL内标物(环己酮和壬酸甲酯),置于50 mL固相微萃取仪采样瓶中,插入装有2 cm-50/30 µm DVB/CAR/PDMS Stable Flex纤维头的手动进样器,在恒温60 ℃的磁力搅拌器(转速200 r/min)上加热,顶空萃取60 min后,移出萃取头并立即插入气相色谱仪进样口(温度250 ℃)中,热解析6 min进样。

    采用HP-5MS (60 m×0.25 mm×0.25 µm)弹性石英毛细管柱,柱温38 ℃(保留2 min),以3 ℃/min升温至176 ℃,以6 ℃/min升温至272 ℃,运行时间:64 min;汽化室温度250 ℃;载气为高纯He(99.999%);柱前压15.87 psi,载气流量1.0 mL/min;不分流进样;溶剂延迟时间:3 min。

    离子源为EI源;离子源温度230 ℃;四级杆温度150 ℃;电子能量70 eV;发射电流34.6 µA;倍增器电压1812 V;接口温度280 ℃;质量范围29~500 amu。

    对总离子流图中的各峰经质谱计算机数据系统检索及核对NIST20和Wiley 275标准质谱图,确定挥发性化学成分,用峰面积归一化法测定各化学成分的相对质量分数。在《化合物嗅觉阈值汇编》[20]检索香气成分的嗅觉阈值,结合各化学成分的相对质量分数,通过以下等式计算各化合物的相对气味活度值(ROAV):

    ROAV=CiCmax×TmaxTi×100

    式中:Ci为香气组分的相对含量(%);Ti为组分在水中的香气阈值(μg/kg);Cmax与Tmax为对样品总体风味贡献最大的组分的相对含量(%)和香气阈值(μg/kg)。

    参考马士成等[21]的方法,所有组分均满足0<ROAV≤100。若ROAV≥1,说明该化合物可能对香气有直接影响,定义为关键香气成分;若0.1≤ROAV<1,说明该香气化合物起重要修饰作用。

    玛瑙红樱桃果实在绿熟期、着色期、商熟期和完熟期的挥发性成分GC-MS总离子流图如图1所示,四个发育时期共检测到114种物质,其中包括醛类22种、萜类25种、醇类13种、酯类31种、呋喃类3种、酮类5种、烯烃类4种、烷烃类8种和其它化合物3种。不同发育阶段,果实的香气组成有所不同。

    图  1  玛瑙红樱桃不同发育时期总离子流图
    Figure  1.  Total ionic chromatogram of aroma components in Manaohong cherry cultivars at different ripening stages

    玛瑙红樱桃不同发育时期香气成分GC-MS分析结果如表1所示,绿熟期的香气组成最丰富,共检测到79种挥发性物质,其中包括醛类13种、醇类11种、酯类29种、萜类13种、呋喃类3种、酮类3种、烯烃类2种、烷烃类3种和其它化合物2种。在着色期共检测到77种挥发性物质,包括醛类15种、醇类11种、酯类20种、萜类16种、呋喃类2种、酮类4种、烯烃类2种、烷烃类5种和其它化合物2种。商熟期共检测到44种挥发性物质,包括醛类17种、醇类5种、酯类2种、萜类8种、呋喃类2种、酮类3种和烷烃类7种。可以看出,商熟期阶段是玛瑙红樱桃香气成分种类最少的时期。其中酯类、萜类和醇类种类数量减少最多,分别减少了18种、6种和8种。完熟期共检测到53种挥发性物质,包括醛类16种、醇类7种、酯类4种、萜类12种、呋喃类2种、酮类2种、烯烃类2种和烷烃类8种。

    表  1  玛瑙红樱桃不同时期香气成分的GC-MS结果
    Table  1.  GC-MS analysis result of aroma components of Manaohong cherry cultivars at different ripening stages
    序号香气成分分子式相对含量(%)RI值
    绿熟期着色期商熟期完熟期
    醛类13种15种17种16种
    1顺式丁烯醛(Z)-2-ButenalC4H6O0.01629
    2反式丁烯醛(E)-2-ButenalC4H6O0.01647
    33-甲基丁醛3-MethylbutanalC5H10O0.140.030.14652
    42-甲基丁醛2-MethylbutanalC5H10O0.150.040.06662
    5戊醛PentanalC5H10O0.010.01700
    6顺-3-己烯醛(Z)-3-HexenalC6H10O0.06800
    7己醛HexanalC6H12O0.602.732.624.69800
    8反式-2-己烯醛(E)-2-hexenalC6H10O3.603.637.064.16854
    9庚醛HeptanalC7H14O0.010.020.03901
    10(E)-2-庚烯醛(E)-2-HeptenalC7H12O0.090.020.04958
    11苯甲醛BenzaldehydeC7H6O15.6754.3883.9861.20962
    12辛醛OctanalC8H16O0.050.050.190.061003
    13苯乙醛BenzeneacetaldehydeC8H8O0.160.190.461045
    14反-2-辛烯醛(E)-2-OctenalC8H14O0.010.030.041060
    15壬醛NonanalC9H18O1.070.620.910.951104
    16反式-2-壬烯醛(E)-2-NonenalC9H16O0.010.030.030.051162
    17癸醛DecanalC10H20O0.430.230.520.351206
    18(E)-2-癸烯醛(E)-2-DecenalC10H18O0.031263
    19十一醛UndecanalC11H22O0.050.030.030.021307
    20反-2- 十一烯醛(E)-2-UndecenalC11H20O0.021365
    21十二醛DodecanalC12H24O0.010.010.011409
    22金合欢基乙醛(4E,8E)-5,9,13-Trimethyl-4,8,12-tetradecatrienalC17H28O0.021847
    合计22.0462.0195.5672.20
    醇类11种11种5种7种
    23异丁醇 IsobutanalC4H8O0.04552
    241-戊烯-3-醇 1-Penten-3-olC5H10O0.040.02684
    253-甲基丁醇 3-MethylbutanolC5H12O0.210.01736
    262-甲基丁醇 2-MethylbutanolC5H12O0.310.01739
    27顺式-3-己烯醇 (Z)-3-HexenolC6H12O0.890.74857
    28反式-2-己烯醇 (E)-2-HexenolC6H12O41.3222.692.2817.43862
    291-正己醇 1-HexanolC6H14O4.141.440.705.40868
    301-辛烯-3-醇 1-Octen-3-olC8H16O0.070.050.050.07980
    312-乙基己醇 2-EthylhexanolC8H18O0.021030
    32苯甲醇 Benzyl alcoholC7H8O1.420.830.040.331030
    33反-2-辛烯醇 (E)-2-OctenolC8H16O0.021067
    34正辛醇 1-OctanolC8H18O0.060.070.050.101071
    351-壬醇 1-NonanolC9H20O0.090.020.061173
    合计48.5925.863.1323.45
    酯类29种20种2种4种
    36己酸甲酯 Methyl caproateC7H14O20.050.010.02925
    37己酸乙酯 Ethyl caproateC8H16O20.121000
    38(Z)-乙酸-3-己烯-1-醇酯 (Z)-3-Hexenol acetateC8H14O21.000.741005
    39乙酸己酯 Hexyl acetateC8H16O23.971.180.010.191011
    40乙酸反-2-己烯酯 (E)-2-Hexenyl acetateC8H14O26.172.910.050.191016
    412-己烯酸乙酯 Ethyl 2-hexenoateC8H14O20.041037
    42苯甲酸甲酯 Methyl benzoateC8H8O20.230.071094
    43反-2-己烯-1-丙酸甲酯 (E)-2-Hexenyl propionateC9H16O21.280.171111
    44辛酸甲酯 Methyl caprylateC9H18O20.021126
    45异丁酸己酯 Hexyl isobutyrateC10H20O20.051150
    46反-2-己烯基异丁酸酯 trans-2-Hexenyl isobutyrateC10H18O20.790.06无记录
    47苯甲酸乙酯Ethyl benzoateC9H10O20.230.021171
    48(E)-己-3-烯基丁酸酯(E)-3-Hexenyl butanoateC10H18O20.050.031185
    49丁酸己酯Hexyl butanoateC10H20O20.340.081192
    50(E)-己-2-烯基丁酸酯(E)-2-Hexenyl butanoateC10H18O24.531.721195
    51水杨酸甲酯Methyl salicylateC8H8O30.031192
    52(E)-己-2-烯基-2-甲基丁酸酯trans-2-Hexenyl 2-methylbutyrateC11H20O21.65未记录
    53反-2-己烯基异戊酸酯trans-2-Hexenyl isovalerateC11H20O20.271245
    54正戊酸叶醇酯(E)-2-Hexenyl pentanoateC11H20O20.120.031299
    55壬酸乙酯Ethyl nonylateC11H22O20.070.021296
    56惕各酸己酯Hexyl tiglateC11H20O20.051330
    57惕各酸-(E)-2-己烯酯(E)-2-Hexenyl tiglateC11H18O21.121339
    58(Z)-己酸-3-己烯酯(Z)-3-Hexenyl hexanoateC12H22O20.010.011380
    59己酸己酯Hexyl caproateC12H24O20.041384
    60(E)-己酸-2-己烯酯(E)-2-Hexenyl hexanoateC12H22O20.600.281391
    61(2E)-2-己烯酸 (2E)-2-己烯-1-酯(2E)-2-Hexenyl (2E)-2-hexenoateC12H20O20.060.04未记录
    62反-己-2-烯基庚酸酯trans-2-Hexenyl heptanoateC13H24O20.01未记录
    63顺式-3-己烯醇苯甲酸酯 (Z)-3-Hexen-1-ol benzoateC13H16O20.010.011570
    64苯甲酸己酯Hexyl benzoateC13H18O20.041580
    65(E)-2-苯甲酸己酯(E)-2-Hexenyl benzoateC13H16O20.570.351588
    66苯甲酸苄酯Benzyl BenzoateC14H12O20.010.011762
    合计23.247.990.060.49
    萜类13种16种8种12种
    67α−蒎烯α−PineneC10H160.04937
    68莰烯CampheneC10H160.02952
    69α−水芹烯α−PhellandreneC10H160.011005
    70柠檬烯LimoneneC8H8O20.060.040.010.071030
    71β−水芹烯β−PhellandreneC8H8O20.031031
    72α−罗勒烯α−OcimeneC10H160.030.040.021047
    73芳樟醇LinaloolC10H18O0.800.040.470.731099
    744-萜烯醇Terpinen-4-olC10H18O0.021177
    75α−松油醇 α−TerpineolC10H18O0.050.131189
    76香叶醇GeraniolC10H18O0.010.031255
    77α−荜澄茄油烯 α−CubebeneC15H240.020.011351
    78胡椒烯CopaeneC15H240.180.101376
    79大马烯酮DamascenoneC13H18O0.011386
    80β−波旁烯β−BourboneneC15H240.051384
    81茉莉酮(Z)-JasmoneC11H16O0.030.101394
    82β−石竹烯β−CaryophylleneC15H240.540.241419
    83α−紫罗兰酮α−IononeC13H20O0.010.010.031426
    84β−二氢紫罗兰酮Dihydro-β−iononeC13H22O0.011433
    85香叶基丙酮Geranyl acetoneC13H22O0.040.030.020.291453
    86葎草烯HumuleneC15H240.080.031454
    87香树烯AlloaromadendreneC15H240.021461
    88β−紫罗兰酮β−IononeC13H20O0.180.100.010.161491
    89α−金合欢烯α−FarneseneC15H240.011508
    90δ−杜松烯δ−CadineneC15H240.020.011524
    91橙花叔醇NerolidolC15H26O0.071544
    合计2.001.560.601.56
    呋喃类3种2种2种2种
    922-乙基呋喃2-EthylfuranC6H8O0.010.010.010.01703
    932-戊基呋喃2-PentylfuranC9H14O0.130.020.010.07993
    94反2-2-戊基呋喃trans-2-(2-Pentenyl)furanC9H12O0.021002
    合计0.160.030.020.08
    酮类3种4种3种2种
    952,3-丁二酮 2,3-ButanedioneC4H6O20.03595
    961-戊烯-3-酮 1-Penten-3-oneC5H8O0.030.010.01681
    971-辛烯-3-酮 1-Octen-3-oneC8H14O0.05979
    982,3-辛二酮 2,3-OctanedioneC8H14O20.040.050.01984
    996-甲基-5-庚烯-2-酮 6-Methyl-5-heptene-2-oneC8H14O0.140.090.010.53986
    合计0.210.20.030.56
    烯烃类2种2种0种2种
    1002,4-已二烯(Z) (Z)-2,4-HexadieneC6H100.02654
    101苯乙烯 StyreneC8H80.041045
    102(E)-4,8-二甲基壬-1,3,7-三烯(E)-4,8-Dimethylnona-1,3,7-trieneC11H180.121116
    1032,6,10,10-四甲基-1-氧杂螺[4,5]癸-6-烯1-Oxaspiro[4,5]dec-6-ene, 2,6,10,10-tetramethyl-C13H22O0.020.020.000.011302
    合计0.040.1400.05
    烷烃类3种5种7种8种
    104壬烷NonaneC9H200.010.04900
    105癸烷DecaneC10H220.031000
    106十三烷TridecaneC13H280.010.010.011300
    107十四烷TetradecaneC14H300.010.031400
    108十五烷PentadecaneC15H320.020.010.031500
    109十六烷HexadecaneC16H340.010.010.010.031600
    110十七烷HeptadecaneC17H360.010.010.010.011700
    111十八烷OctadecaneC18H380.010.010.010.011800
    合计0.030.060.070.19
    其他2种2种0种0种
    112二甲基硫醚Dimethyl sulfideC2H6S0.37520
    113己酸Hexanoic acidC6H12O20.060.23990
    114苄腈Benzyl nitrileC8H7N0.011144
    合计0.430.2400
    注: “−”表示该成分香气未检测到;RI值为保留指数。
    下载: 导出CSV 
    | 显示表格

    图2所示,在四个发育成熟阶段,醛类物质始终是玛瑙红樱桃的主要香气成分,随着果实不断成熟,呈现先上升后下降的趋势。除绿熟期相对含量比醇类物质低以外,醛类物质在其余发育成熟阶段的相对含量均最高。进入着色期后,醛类物质迅速增长,直至商熟期达到最高值95.56%,之后随着果实完全成熟,在完熟期下降至72.20%。可见,醛类物质在着色期到商熟期之间被大量合成。C6醛类和芳香醛类是玛瑙红樱桃中最主要的香气物质,与红灯樱桃、先锋樱桃和斯坦勒樱桃等大多数樱桃一致[19,22-24]。玛瑙红樱桃中醛类物质的变化主要与芳香醛类和C6醛类化合物有关。

    图  2  玛瑙红樱桃不同发育时期主要挥发性成分含量变化
    Figure  2.  Variations of main volatile components in the fruits of Manaohong cherry cultivars at different ripening stages

    芳香醛类化合物中最主要的是苯甲醛,占醛类挥发性物质总量的71.10%~87.88%。苯甲醛在绿熟期的相对含量仅为15.67%,随着果实成熟而升高,在着色期上升至54.38%,商熟期达到最高值83.98%,完熟期下降至61.20%。苯甲醛具有樱桃香和苦杏仁味,其苦杏仁味主要是由核果中苦杏仁苷酶促水解而产生[10,22]。目前已报道的成熟布鲁克斯、萨米脱、先锋、红灯等8个樱桃品种中[9,25],苯甲醛相对含量为2.54%~39.3%,均远低于本研究中玛瑙红樱桃的苯甲醛相对含量。

    C6醛类化合物(反式-2-己烯醛、己醛、顺-3-己烯醛)在绿熟期的相对含量仅为4.20%,随着果实的成熟不断升高,在着色期上升至6.36%,商熟期达到最高值9.74%,完熟期下降至8.85%。张序[19]、陈美霞[26]、Engel[27]、Chapman[28]等的研究显示,在红灯樱桃、桃、油桃和杏等核果类果实发育过程中,C6醛类化合物在着色期相对含量最高,然后随果实成熟逐渐下降。与此不同的是,本研究中玛瑙红樱桃C6醛类化合物相对含量持续增加至商熟期达到最高值,随果实完全成熟才开始下降。这可能与果实中脂氧合酶的活性有关。醛类物质主要是通过脂肪酸途径产生,脂氧合酶是脂肪酸途径的关键酶,由脂肪酸在脂氧合酶的作用下,经过氧化、裂解及脱氢作用转化成相应的醛类。脂氧合酶活性在果实发育后期是下降的。因此,完熟期玛瑙红樱桃中C6醛类化合物相对含量下降可能与脂氧合酶的活性减弱有关。

    在发育成熟过程中,玛瑙红樱桃中的醇类物质呈现先下降后上升的趋势。如图2所示,在绿熟期时,醇类物质的相对含量最高,达到48.59%;随着果实成熟,相对含量不断下降,在着色期下降至25.86%,商熟期达到最低值3.13%,完熟期回升至23.45%。C6醇类,包括反式-2-己烯醇、1-正己醇和顺式-3-己烯醇是果蔬中青香型气味的主要来源,并且也是玛瑙红樱桃中最主要的醇类物质,占醇类挥发性物质总量的95.21%~97.36%。其中反式-2-己烯醇相对含量最高,绿熟期高达41.32%,在完熟期降至17.43%。反式-2-己烯醇也是拉宾斯、先锋、宾库等樱桃的主要醇类物质[10,29]。1-正己醇在绿熟期和完熟期相对含量较高,分别为4.14%和5.40%;着色期和商熟期较低,为1.44%和0.70%。玛瑙红樱桃中1-正己醇相对含量高于雷尼尔、拉宾斯、斯坦纳、芝罘红和砂蜜豆等樱桃[24,30]

    酯类物质是许多果实香气的主要成分[11,26,31],在樱桃果实中普遍含量较少。如在红灯、斯坦勒、水晶、先锋、萨米脱、黑珍珠、拉宾斯等樱桃品种中含量仅有0.30%~2.72%[16,19]。本研究发现,绿熟期和着色期阶段的玛瑙红樱桃酯类物质相对含量分别高达23.24%和7.99%。反-2-己烯酯、反-己-2-烯基丁酸酯和乙酸己酯是绿熟期和着色期最主要的酯类化合物,三者相对含量之和分别占绿熟期和着色期酯类挥发性物质总量的63.12%和72.72%。随着果实发育成熟,酯类物质相对含量大幅减少。进入商熟期后,酯类物质相对含量骤降至最低0.06%,在完熟期小幅回升至0.49%。并且,反-2-己烯酯和乙酸己酯是商熟期仅有的两种酯类物质;而反-2-己烯酯、乙酸己酯、己酸甲酯和水杨酸甲酯是完熟期仅有的4种酯类物质。与玛瑙红樱桃酯类物质相对含量变化不同的是,红灯樱桃中酯类物质在绿熟期相对含量最低(0.30%),随着果实发育成熟,不断上升至2.00%[25]。酯类物质是水果中果香味的主要来源,酯类物质的差异可能是引起不同品种樱桃风味不同的主要原因,有待进一步研究。

    玛瑙红樱桃中的萜类物质种类较丰富,但相对含量较低;绿熟期、着色期、商熟期和完熟期的相对含量分别为2.00%、1.56%、0.60%和1.56%。其变化趋势与醛类物质一致,呈现先下降后上升的趋势。在水晶、佐藤堇、红灯、甜心樱桃中的萜类物质含量也普遍较低[22,24,32]。由于萜类物质香气阈值普遍也极低,因此它们对果实香气的贡献作用不容忽视,可以赋予果实丰富的花香[22]。四个发育时期,所有萜类物质的相对含量均未超过1.00%,其中最高的是芳樟醇和β-石竹烯,占萜类挥发性物质总量的17.95%~78.33%。

    酮类、呋喃类、烷烃类等其他物质的种类虽然比较丰富,但在四个发育时期的相对含量极低,仅占香气总量的0.08%~0.86%。

    相关研究表明,超过10000种挥发性成分被相继检测和报道,然而研究发现其中仅有很少一部分成分能够影响食品的整体呈香,这类挥发性成分被称作“关键香气成分”[21-33]。挥发性成分含量的高低并不能说明其对香气品质的贡献程度,只有含量超过其香气阈值的少数物质对果实的香气起关键作用[34-35]。如表2所示,共鉴定出20种ROAV值不小于1的关键香气成分,包括11种醛类、3种醇类、3种萜类、2种酯类、1种呋喃。绿熟期、着色期、商熟期、完熟期分别鉴定出15、13、10和15种关键香气成分。在四个发育阶段,壬醛和芳樟醇均是最重要的关键香气成分。壬醛具有柑橘味和青叶香,除着色期ROAV值为89.91以外,壬醛在绿熟期、商熟期和完熟期的ROAV值均为100。芳樟醇赋予樱桃花香和薰衣草香,在着色期的ROAV值为100,在绿熟期、商熟期、完熟期分别为75.12、51.87、76.87。己醛具有青草香,在绿熟期ROAV值(11.31)较低,在着色期、商熟期和完熟期具有很高的ROAV值(57.80~98.70)。除壬醛、芳樟醇、己醛以外,绿熟期最主要的关键香气成分依次还有反式-2-己烯醇、乙酸己酯、2-甲基丁醛;着色期最主要的关键香气成分依次有反式-2-己烯醇、乙酸己酯、苯甲醛;商熟期最主要的关键香气成分依次有顺-3-己烯醛和苯甲醛;完熟期最主要的关键香气成分依次有反式-2-己烯醇、苯乙醛。这些关键香气成分的ROAV值均大于10。

    表  2  玛瑙红樱桃不同时期香气成分的气味描述、香气阈值及相对香气活度值
    Table  2.  Odor description, odor threshold and relative odor active value of aroma compounds of Manaohong cherry cultivars at four stages
    香气成分香气描述香气阈值(μg/kg)相对气味活度值(ROAV)
    绿熟期着色期商熟期完熟期
    醛类11种11种10种11种
    13-甲基丁醛3-Methylbutanal苹果香1.508.833.279.88
    22-甲基丁醛2-Methylbutanal烘烤香1.1012.805.635.26
    3戊醛Pentanal12.000.120.11
    4顺-3-己烯醛(Z)-3-Hexenal青香0.2035.24
    5己醛Hexanal青草5.0011.3178.5657.8098.70
    6反式-2-己烯醛(E)-2-hexenal苹果,青叶香110.003.074.767.063.98
    7苯甲醛Benzaldehyde樱桃,杏仁751.001.9610.4312.328.57
    8辛醛Octanal橙皮3.401.301.996.121.70
    9苯乙醛Benzeneacetaldehyde蜂蜜,玫瑰花香4.003.856.6612.01
    10反-2-辛烯醛(E)-2-Octenal青叶香,坚果香,脂香3.000.441.341.58
    11壬醛Nonanal脂香,柑橘,青叶香1.00100.0089.91100.00100.00
    12反式-2-壬烯醛(E)-2-Nonenal青香、黄瓜、柑橘1.100.773.672.504.30
    13癸醛Decanal薄荷,青叶70.000.580.470.820.53
    醇类5种4种2种3种
    143-甲基丁醇3-Methylbutanol2800.000.01
    15顺式-3-己烯醇 (Z)-3-Hexenol青叶香气13.006.448.15
    16反式-2-己烯醇 (E)-2-Hexenol青香、果香、蔬菜香和草香100.0038.8032.692.5118.33
    171-正己醇1-Hexanol青草味500.000.780.410.151.14
    181-壬醇1-Nonanol花香、果香18.000.490.140.33
    酯类4种3种0种0种
    19乙酸己酯Hexyl acetate水果、青香、苹果17.0021.9514.84
    20苯甲酸甲酯Methyl benzoate花香、蜂蜜73.000.290.13
    21苯甲酸乙酯Ethyl benzoate花香55.560.39
    22(E)-己-2-烯基丁酸酯(E)-2-Hexenyl butanoate320.001.330.77
    萜类5种3种3种5种
    23柠檬烯Limonene柑橘,薄荷10.000.600.530.110.77
    24芳樟醇Linalool花香,薰衣草1.0075.12100.0051.8776.87
    25β−石竹烯β−Caryophyllene辛香、木香和萜烯的香气500.000.10
    26α−紫罗兰酮α−Ionone木香,紫罗兰香0.602.035.08
    27香叶基丙酮Geranyl acetone花果香60.000.50
    28β−紫罗兰酮β−Ionone紫罗兰香气70.000.241.960.172.45
    其它2种3种2种3种
    292,3-丁二酮2,3-Butanedione6.000.51
    301-辛烯-3-酮1-Octen-3-one具有清新泥土、蘑菇、蔬菜香气10.000.65
    316-甲基-5-庚烯-2-酮6-Methyl-5-heptene-2-one水果香气及柠檬草香气68.000.200.190.020.82
    322-戊基呋喃2-Pentylfuran清香、青豆味、金属味6.001.960.580.221.17
    注: “−”表示该成分香气描述未被查询到或该物质ROAV<0.1;香气描述通过“Perflavory Information System”查询。
    下载: 导出CSV 
    | 显示表格

    值得注意的是,壬醛和芳樟醇的相对含量在四个发育时期均未超过2.00%;但两者ROAV值很高,这充分说明香气阈值对气味贡献的重要性。类似地,具有苹果香的3-甲基丁醛、具有烘烤香的2-甲基丁醛、具有玫瑰香和蜂蜜香的苯乙醛在绿熟期、着色期、完熟期的相对含量均未超过0.50%,但ROAV值达到3.27%~12.80%。拉宾斯、雷尼尔樱桃中3-甲基丁醛的相对含量也极低,仅为0.65%~0.81%;但FD稀释因子均高达16,对拉宾斯、雷尼尔樱桃有显著的香气贡献作用,这与本研究的发现一致[24]。虽然与其他发育阶段相比,商熟期的关键香气成分较少,但风味并不单一。具有苹果香、青叶香的反式-2-己烯醛、具有橙皮味的辛醛以及具有樱桃、杏仁味的苯甲醛在商熟期的ROAV值均是最高的,赋予了商熟期玛瑙红樱桃丰富的风味。具有青香的顺-3-己烯醛是唯一出现在商熟期的特征性关键香气成分,ROAV值达35.24,可以作为区分鉴别玛瑙红樱桃商熟期的重要参考。

    本研究采用HS-SPME-GC-MS技术从不同发育时期的玛瑙红樱桃中共检测出114种芳香化合物。在绿熟期玛瑙红樱桃中检测出79种挥发性化合物,着色期检测出77种、商熟期检测出44种、完熟期检测出53种。其中相对含量最多的是醛类物质和醇类物质,并且以芳香醛类、C6醛类和C6醇类构成最主要的香气组分,相对含量分别占绿熟期、着色期、商熟期和完熟期挥发性物质总量的66.22%、85.61%、96.70%和92.88%。酯类物质和醇类物质在果实绿熟期和着色期大量合成,在商熟期被大量代谢消耗,相对含量骤减至最低值,至完熟期时又略微回升。与之相反的是,醛类物质从绿熟期开始便持续不断合成,直至商熟期达到最高值,至完熟期时又略微下降。通过ROAV值评价方法,共鉴定出20种ROAV值不小于1的关键香气成分,其中壬醛、芳樟醇、己醛是最重要的关键香气成分,对玛瑙红樱桃的香气品质具有极其重要贡献,是构成玛瑙红樱桃呈香风格的关键香气化合物。具有青香的顺-3-己烯醛是唯一出现在商熟期的特征性关键香气成分。目前,不同樱桃品种在发育过程中香气物质含量有所差异,参与香气组成的醛类、醇类、酯类等物质的合成和代谢速度也各不相同。产地海拔与气候、产地栽培环境、人工施肥等因素的不同均会导致不同品种樱桃果实香气物质的差异。因此,全面了解并掌握樱桃果实香气物质的组成与变化特征,还需要更加深入和系统的研究。

  • 图  1   玛瑙红樱桃不同发育时期总离子流图

    Figure  1.   Total ionic chromatogram of aroma components in Manaohong cherry cultivars at different ripening stages

    图  2   玛瑙红樱桃不同发育时期主要挥发性成分含量变化

    Figure  2.   Variations of main volatile components in the fruits of Manaohong cherry cultivars at different ripening stages

    表  1   玛瑙红樱桃不同时期香气成分的GC-MS结果

    Table  1   GC-MS analysis result of aroma components of Manaohong cherry cultivars at different ripening stages

    序号香气成分分子式相对含量(%)RI值
    绿熟期着色期商熟期完熟期
    醛类13种15种17种16种
    1顺式丁烯醛(Z)-2-ButenalC4H6O0.01629
    2反式丁烯醛(E)-2-ButenalC4H6O0.01647
    33-甲基丁醛3-MethylbutanalC5H10O0.140.030.14652
    42-甲基丁醛2-MethylbutanalC5H10O0.150.040.06662
    5戊醛PentanalC5H10O0.010.01700
    6顺-3-己烯醛(Z)-3-HexenalC6H10O0.06800
    7己醛HexanalC6H12O0.602.732.624.69800
    8反式-2-己烯醛(E)-2-hexenalC6H10O3.603.637.064.16854
    9庚醛HeptanalC7H14O0.010.020.03901
    10(E)-2-庚烯醛(E)-2-HeptenalC7H12O0.090.020.04958
    11苯甲醛BenzaldehydeC7H6O15.6754.3883.9861.20962
    12辛醛OctanalC8H16O0.050.050.190.061003
    13苯乙醛BenzeneacetaldehydeC8H8O0.160.190.461045
    14反-2-辛烯醛(E)-2-OctenalC8H14O0.010.030.041060
    15壬醛NonanalC9H18O1.070.620.910.951104
    16反式-2-壬烯醛(E)-2-NonenalC9H16O0.010.030.030.051162
    17癸醛DecanalC10H20O0.430.230.520.351206
    18(E)-2-癸烯醛(E)-2-DecenalC10H18O0.031263
    19十一醛UndecanalC11H22O0.050.030.030.021307
    20反-2- 十一烯醛(E)-2-UndecenalC11H20O0.021365
    21十二醛DodecanalC12H24O0.010.010.011409
    22金合欢基乙醛(4E,8E)-5,9,13-Trimethyl-4,8,12-tetradecatrienalC17H28O0.021847
    合计22.0462.0195.5672.20
    醇类11种11种5种7种
    23异丁醇 IsobutanalC4H8O0.04552
    241-戊烯-3-醇 1-Penten-3-olC5H10O0.040.02684
    253-甲基丁醇 3-MethylbutanolC5H12O0.210.01736
    262-甲基丁醇 2-MethylbutanolC5H12O0.310.01739
    27顺式-3-己烯醇 (Z)-3-HexenolC6H12O0.890.74857
    28反式-2-己烯醇 (E)-2-HexenolC6H12O41.3222.692.2817.43862
    291-正己醇 1-HexanolC6H14O4.141.440.705.40868
    301-辛烯-3-醇 1-Octen-3-olC8H16O0.070.050.050.07980
    312-乙基己醇 2-EthylhexanolC8H18O0.021030
    32苯甲醇 Benzyl alcoholC7H8O1.420.830.040.331030
    33反-2-辛烯醇 (E)-2-OctenolC8H16O0.021067
    34正辛醇 1-OctanolC8H18O0.060.070.050.101071
    351-壬醇 1-NonanolC9H20O0.090.020.061173
    合计48.5925.863.1323.45
    酯类29种20种2种4种
    36己酸甲酯 Methyl caproateC7H14O20.050.010.02925
    37己酸乙酯 Ethyl caproateC8H16O20.121000
    38(Z)-乙酸-3-己烯-1-醇酯 (Z)-3-Hexenol acetateC8H14O21.000.741005
    39乙酸己酯 Hexyl acetateC8H16O23.971.180.010.191011
    40乙酸反-2-己烯酯 (E)-2-Hexenyl acetateC8H14O26.172.910.050.191016
    412-己烯酸乙酯 Ethyl 2-hexenoateC8H14O20.041037
    42苯甲酸甲酯 Methyl benzoateC8H8O20.230.071094
    43反-2-己烯-1-丙酸甲酯 (E)-2-Hexenyl propionateC9H16O21.280.171111
    44辛酸甲酯 Methyl caprylateC9H18O20.021126
    45异丁酸己酯 Hexyl isobutyrateC10H20O20.051150
    46反-2-己烯基异丁酸酯 trans-2-Hexenyl isobutyrateC10H18O20.790.06无记录
    47苯甲酸乙酯Ethyl benzoateC9H10O20.230.021171
    48(E)-己-3-烯基丁酸酯(E)-3-Hexenyl butanoateC10H18O20.050.031185
    49丁酸己酯Hexyl butanoateC10H20O20.340.081192
    50(E)-己-2-烯基丁酸酯(E)-2-Hexenyl butanoateC10H18O24.531.721195
    51水杨酸甲酯Methyl salicylateC8H8O30.031192
    52(E)-己-2-烯基-2-甲基丁酸酯trans-2-Hexenyl 2-methylbutyrateC11H20O21.65未记录
    53反-2-己烯基异戊酸酯trans-2-Hexenyl isovalerateC11H20O20.271245
    54正戊酸叶醇酯(E)-2-Hexenyl pentanoateC11H20O20.120.031299
    55壬酸乙酯Ethyl nonylateC11H22O20.070.021296
    56惕各酸己酯Hexyl tiglateC11H20O20.051330
    57惕各酸-(E)-2-己烯酯(E)-2-Hexenyl tiglateC11H18O21.121339
    58(Z)-己酸-3-己烯酯(Z)-3-Hexenyl hexanoateC12H22O20.010.011380
    59己酸己酯Hexyl caproateC12H24O20.041384
    60(E)-己酸-2-己烯酯(E)-2-Hexenyl hexanoateC12H22O20.600.281391
    61(2E)-2-己烯酸 (2E)-2-己烯-1-酯(2E)-2-Hexenyl (2E)-2-hexenoateC12H20O20.060.04未记录
    62反-己-2-烯基庚酸酯trans-2-Hexenyl heptanoateC13H24O20.01未记录
    63顺式-3-己烯醇苯甲酸酯 (Z)-3-Hexen-1-ol benzoateC13H16O20.010.011570
    64苯甲酸己酯Hexyl benzoateC13H18O20.041580
    65(E)-2-苯甲酸己酯(E)-2-Hexenyl benzoateC13H16O20.570.351588
    66苯甲酸苄酯Benzyl BenzoateC14H12O20.010.011762
    合计23.247.990.060.49
    萜类13种16种8种12种
    67α−蒎烯α−PineneC10H160.04937
    68莰烯CampheneC10H160.02952
    69α−水芹烯α−PhellandreneC10H160.011005
    70柠檬烯LimoneneC8H8O20.060.040.010.071030
    71β−水芹烯β−PhellandreneC8H8O20.031031
    72α−罗勒烯α−OcimeneC10H160.030.040.021047
    73芳樟醇LinaloolC10H18O0.800.040.470.731099
    744-萜烯醇Terpinen-4-olC10H18O0.021177
    75α−松油醇 α−TerpineolC10H18O0.050.131189
    76香叶醇GeraniolC10H18O0.010.031255
    77α−荜澄茄油烯 α−CubebeneC15H240.020.011351
    78胡椒烯CopaeneC15H240.180.101376
    79大马烯酮DamascenoneC13H18O0.011386
    80β−波旁烯β−BourboneneC15H240.051384
    81茉莉酮(Z)-JasmoneC11H16O0.030.101394
    82β−石竹烯β−CaryophylleneC15H240.540.241419
    83α−紫罗兰酮α−IononeC13H20O0.010.010.031426
    84β−二氢紫罗兰酮Dihydro-β−iononeC13H22O0.011433
    85香叶基丙酮Geranyl acetoneC13H22O0.040.030.020.291453
    86葎草烯HumuleneC15H240.080.031454
    87香树烯AlloaromadendreneC15H240.021461
    88β−紫罗兰酮β−IononeC13H20O0.180.100.010.161491
    89α−金合欢烯α−FarneseneC15H240.011508
    90δ−杜松烯δ−CadineneC15H240.020.011524
    91橙花叔醇NerolidolC15H26O0.071544
    合计2.001.560.601.56
    呋喃类3种2种2种2种
    922-乙基呋喃2-EthylfuranC6H8O0.010.010.010.01703
    932-戊基呋喃2-PentylfuranC9H14O0.130.020.010.07993
    94反2-2-戊基呋喃trans-2-(2-Pentenyl)furanC9H12O0.021002
    合计0.160.030.020.08
    酮类3种4种3种2种
    952,3-丁二酮 2,3-ButanedioneC4H6O20.03595
    961-戊烯-3-酮 1-Penten-3-oneC5H8O0.030.010.01681
    971-辛烯-3-酮 1-Octen-3-oneC8H14O0.05979
    982,3-辛二酮 2,3-OctanedioneC8H14O20.040.050.01984
    996-甲基-5-庚烯-2-酮 6-Methyl-5-heptene-2-oneC8H14O0.140.090.010.53986
    合计0.210.20.030.56
    烯烃类2种2种0种2种
    1002,4-已二烯(Z) (Z)-2,4-HexadieneC6H100.02654
    101苯乙烯 StyreneC8H80.041045
    102(E)-4,8-二甲基壬-1,3,7-三烯(E)-4,8-Dimethylnona-1,3,7-trieneC11H180.121116
    1032,6,10,10-四甲基-1-氧杂螺[4,5]癸-6-烯1-Oxaspiro[4,5]dec-6-ene, 2,6,10,10-tetramethyl-C13H22O0.020.020.000.011302
    合计0.040.1400.05
    烷烃类3种5种7种8种
    104壬烷NonaneC9H200.010.04900
    105癸烷DecaneC10H220.031000
    106十三烷TridecaneC13H280.010.010.011300
    107十四烷TetradecaneC14H300.010.031400
    108十五烷PentadecaneC15H320.020.010.031500
    109十六烷HexadecaneC16H340.010.010.010.031600
    110十七烷HeptadecaneC17H360.010.010.010.011700
    111十八烷OctadecaneC18H380.010.010.010.011800
    合计0.030.060.070.19
    其他2种2种0种0种
    112二甲基硫醚Dimethyl sulfideC2H6S0.37520
    113己酸Hexanoic acidC6H12O20.060.23990
    114苄腈Benzyl nitrileC8H7N0.011144
    合计0.430.2400
    注: “−”表示该成分香气未检测到;RI值为保留指数。
    下载: 导出CSV

    表  2   玛瑙红樱桃不同时期香气成分的气味描述、香气阈值及相对香气活度值

    Table  2   Odor description, odor threshold and relative odor active value of aroma compounds of Manaohong cherry cultivars at four stages

    香气成分香气描述香气阈值(μg/kg)相对气味活度值(ROAV)
    绿熟期着色期商熟期完熟期
    醛类11种11种10种11种
    13-甲基丁醛3-Methylbutanal苹果香1.508.833.279.88
    22-甲基丁醛2-Methylbutanal烘烤香1.1012.805.635.26
    3戊醛Pentanal12.000.120.11
    4顺-3-己烯醛(Z)-3-Hexenal青香0.2035.24
    5己醛Hexanal青草5.0011.3178.5657.8098.70
    6反式-2-己烯醛(E)-2-hexenal苹果,青叶香110.003.074.767.063.98
    7苯甲醛Benzaldehyde樱桃,杏仁751.001.9610.4312.328.57
    8辛醛Octanal橙皮3.401.301.996.121.70
    9苯乙醛Benzeneacetaldehyde蜂蜜,玫瑰花香4.003.856.6612.01
    10反-2-辛烯醛(E)-2-Octenal青叶香,坚果香,脂香3.000.441.341.58
    11壬醛Nonanal脂香,柑橘,青叶香1.00100.0089.91100.00100.00
    12反式-2-壬烯醛(E)-2-Nonenal青香、黄瓜、柑橘1.100.773.672.504.30
    13癸醛Decanal薄荷,青叶70.000.580.470.820.53
    醇类5种4种2种3种
    143-甲基丁醇3-Methylbutanol2800.000.01
    15顺式-3-己烯醇 (Z)-3-Hexenol青叶香气13.006.448.15
    16反式-2-己烯醇 (E)-2-Hexenol青香、果香、蔬菜香和草香100.0038.8032.692.5118.33
    171-正己醇1-Hexanol青草味500.000.780.410.151.14
    181-壬醇1-Nonanol花香、果香18.000.490.140.33
    酯类4种3种0种0种
    19乙酸己酯Hexyl acetate水果、青香、苹果17.0021.9514.84
    20苯甲酸甲酯Methyl benzoate花香、蜂蜜73.000.290.13
    21苯甲酸乙酯Ethyl benzoate花香55.560.39
    22(E)-己-2-烯基丁酸酯(E)-2-Hexenyl butanoate320.001.330.77
    萜类5种3种3种5种
    23柠檬烯Limonene柑橘,薄荷10.000.600.530.110.77
    24芳樟醇Linalool花香,薰衣草1.0075.12100.0051.8776.87
    25β−石竹烯β−Caryophyllene辛香、木香和萜烯的香气500.000.10
    26α−紫罗兰酮α−Ionone木香,紫罗兰香0.602.035.08
    27香叶基丙酮Geranyl acetone花果香60.000.50
    28β−紫罗兰酮β−Ionone紫罗兰香气70.000.241.960.172.45
    其它2种3种2种3种
    292,3-丁二酮2,3-Butanedione6.000.51
    301-辛烯-3-酮1-Octen-3-one具有清新泥土、蘑菇、蔬菜香气10.000.65
    316-甲基-5-庚烯-2-酮6-Methyl-5-heptene-2-one水果香气及柠檬草香气68.000.200.190.020.82
    322-戊基呋喃2-Pentylfuran清香、青豆味、金属味6.001.960.580.221.17
    注: “−”表示该成分香气描述未被查询到或该物质ROAV<0.1;香气描述通过“Perflavory Information System”查询。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-11
  • 网络出版日期:  2022-02-11
  • 刊出日期:  2022-03-31

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