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愛格麗干白葡萄酒發(fā)酵過程中典型乙酸酯的生成動力學(xué)
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國家自然科學(xué)基金項目(31771966)和中央高?;究蒲袠I(yè)務(wù)費專項資金項目(2452017151)


Kinetical Feature for Acetate Esters Production during Ecolly Dry White Wine Fermentation
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    摘要:

    為建立干白葡萄酒中重要乙酸酯的生成動力學(xué)模型,,以愛格麗葡萄為原料,,接種釀酒酵母,,按常規(guī)工藝釀造干白葡萄酒,。發(fā)酵過程中監(jiān)測乙醇和乙酸含量變化,,并定時取樣進(jìn)行目標(biāo)香氣物質(zhì)(異戊醇,、苯乙醇,、乙酸乙酯,、乙酸異戊酯和乙酸苯乙酯)的SPME-GC-MS分析,建立目標(biāo)香氣物質(zhì)的香氣活性值變化曲線,,同時從經(jīng)典化學(xué)反應(yīng)動力學(xué)角度構(gòu)建目標(biāo)香氣物質(zhì)的生成動力學(xué)模型,。研究結(jié)果表明,乙酸異戊酯在發(fā)酵過程中表現(xiàn)出香氣活性,,乙酸苯乙酯僅在最大檢出量時表現(xiàn)香氣活性,,乙酸乙酯檢出量一直低于嗅覺閾值。目標(biāo)香氣物質(zhì)從開始生成至達(dá)到最大生成量的含量變化均符合零級動力學(xué)模型(R2>0.95,,P<0.001),。模型揭示出,乙酸乙酯的生成與乙醇和乙酸具有同時性,,乙酸異戊酯和乙酸苯乙酯的生成分別相對于異戊醇和苯乙醇有延滯效應(yīng),。結(jié)合零級動力學(xué)模型特征,為增強(qiáng)葡萄酒的花香和果香特征,,可嘗試在愛格麗葡萄汁發(fā)酵旺盛的香氣物質(zhì)半生成期,,調(diào)控促進(jìn)乙酸乙酯和乙酸苯乙酯生成。

    Abstract:

    Acetic esters are an important contributor to the fruity aroma of wine. The aim of the research was to explore the kinetical feature for the formation of important acetic esters, using Ecolly to ferment dry white wine according to conventional process after being inoculated with active yeast. During the fermentation process, the ethanol and acetic acid contents were monitored and the contents of representative aroma of isoamyl alcohol, phenethyl alcohol, ethyl acetate, isoamyl acetate and phenethyl acetate were analyzed by SPME-GC-MS so as to achieve the feature of odor activity and establish corresponding kinetical models based on the classical principle of chemical reaction kinetics. The results showed that the isoamyl acetate exhibited aroma active through the fermentation process, and phenethyl acetate was only aroma active at the maximum production, while ethyl acetate was lower than the olfactory threshold. The contents of the considered aroma from the beginning to the maximum production were in line with the zero order kinetical feature (R2>0.95, P<0.001), revealing that the production of ethyl acetate was synchronous with the production of acetic acid and ethanol, whilst the production of isoamyl acetate or phenethyl acetate was delayed compared with the production of isoamyl alcohol and phenethyl alcohol. With considering the characteristics of zero order kinetics, the production of acetic acid and phenethyl acetate could be modulated and enhanced at their halfproduction times so as to improve the floral and fruity odour.

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李運奎,汪興杰,靳國杰,宋鴻聰,劉浩,陶永勝.愛格麗干白葡萄酒發(fā)酵過程中典型乙酸酯的生成動力學(xué)[J].農(nóng)業(yè)機(jī)械學(xué)報,2018,49(8):360-367. LI Yunkui, WANG Xingjie, JIN Guojie, SONG Hongcong, LIU Hao, TAO Yongsheng. Kinetical Feature for Acetate Esters Production during Ecolly Dry White Wine Fermentation[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(8):360-367.

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  • 收稿日期:2018-02-12
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  • 在線發(fā)布日期: 2018-08-10
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