Hochschule RheinMain-University of Applied Sciences, 65366 Geisenheim, Germany.
J Agric Food Chem. 2010 Dec 22;58(24):12692-702. doi: 10.1021/jf102937e. Epub 2010 Nov 18.
Strawberries (Fragaria × ananassa Duch. cvs. Everest, Elsanta) were grown in a tunnel covered with two films, which were distinguished in their ultraviolet transparency, as well as under open-field conditions. One applied film was not transparent for UVB radiation, and the second film transmitted 70% of UVB radiation. During the present study, the nutritional value and quality parameters of the fruits were evaluated. Strawberries were UV-unresponsive in view of the content of ascorbic acid and sum parameters like total anthocyanins and antioxidant capacity measured with TEAC (trolox equivalent antioxidant capacity), ORAC (oxygen radical absorbance capacity) and total phenols. These parameters were mainly affected by sampling date and cultivar. However, HPLC analysis showed that individual phenolics were affected in the absence of UV radiation. The content of the anthocyanin cyanidin 3-glucoside and the flavonols quercetin 3-glucuronide and kaempferol 3-glucoside was decreased in the fruits grown under UV blocking film compared to open-field grown strawberries. By means of the UV transparent film the content of the mentioned flavonoids could be enhanced up to similar amounts like in open-field grown strawberries. All other phenolics were not consistently affected by UV radiation. This result was independent of cultivar.
草莓（Fragaria × ananassa Duch. cvs. Everest、Elsanta）在覆盖有两种薄膜的隧道中种植，这两种薄膜在紫外线透明度上有所区别，同时也在露天条件下种植。一种应用的薄膜对 UVB 辐射不透明，第二种薄膜则透射 70%的 UVB 辐射。在本研究中，评估了果实的营养价值和质量参数。考虑到抗坏血酸含量以及总花青素和抗氧化能力等参数，如 TEAC（trolox 当量抗氧化能力）、ORAC（氧自由基吸收能力）和总酚，草莓对紫外线无反应。这些参数主要受采样日期和品种的影响。然而，HPLC 分析表明，在没有紫外线辐射的情况下，个别类黄酮受到影响。与露天生长的草莓相比，在阻挡紫外线的薄膜下生长的草莓中，花色苷矢车菊素 3-葡萄糖苷和类黄酮槲皮素 3-葡萄糖醛酸和山奈酚 3-葡萄糖苷的含量降低。通过使用紫外线透明薄膜，可以将所述类黄酮的含量提高到与露天生长的草莓相似的水平。所有其他类黄酮不受紫外线辐射的影响。该结果与品种无关。
