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首页> 外文会议>Food flavor : Chemistry, sensory evaluation, and biological activity >C_(13)-Norisoprenoid Concentrations in Grapes as Affected by Sunlight and Shading
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C_(13)-Norisoprenoid Concentrations in Grapes as Affected by Sunlight and Shading

机译：光照和遮荫对葡萄中C_（13）-类肾上腺皮质激素浓度的影响

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摘要

Volatile C_(13)-norisoprenoids contribute important flavor properties to many grape and wine varieties, however factors influencing their formation are not well understood. We evaluated the effects of different levels of sunlight exposures on norisoprenoid concentrations in White Riesling and Cabernet Sauvignon grapes at variable maturity levels. In addition to allowing the grapes specific amounts of sunlight using shade cloth to control levels between 4 - 97% of full sun exposure, UV-A/B light (300 - 400 nm) was also controlled in some trials. The norisoprenoid content of grapes from these trials were compared to those of grapes grown under natural shade conditions, i.e., grapes that were shaded by their own leaves. In Cabernet, the concentration of the norisoprenoid, vitispirane, increased linearly (r~2 = 0.969, p< 0.001) as sunlight exposure increased. Removing UV-A/B light had little effect on norisoprenoid concentrations in White Riesling grapes. Surprisingly, norisoprenoid concentrations in both Cabernet and Riesling were approximately three times higher in berries from naturally shaded vines compared to grapes from vines which had the applied shade cloth with a similar level of light exposure (～ 4%).
机译：挥发性的C_（13）-去甲类肾上腺素对许多葡萄和葡萄酒品种都具有重要的风味特性，但是影响其形成的因素尚不十分清楚。我们评估了不同日照水平对可变成熟度的白雷司令和赤霞珠葡萄中类胡萝卜素含量的影响。在某些试验中，除了使用遮光布允许葡萄特定量的阳光将日照量控制在4-97％之间外，还对UV-A / B光（300-400 nm）进行了控制。将这些试验中的葡萄的类胡萝卜素含量与在自然遮荫条件下生长的葡萄（即用自己的叶子遮荫的葡萄）的类胡萝卜素含量进行比较。在赤霞珠中，随着阳光暴露量的增加，去甲肾上腺素类维生素A的浓度线性增加（r〜2 = 0.969，p <0.001）。去除UV-A / B光对白雷司令葡萄中类胡萝卜素的浓度影响很小。出人意料的是，天然遮荫葡萄藤中的浆果中赤霞珠和雷司令酒中的类异戊二烯含量约为使用了类似遮光布（约4％）的遮阴布葡萄的葡萄的三倍。

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