Belge Burcu, Llovera Montserrat, Comabella Eva, Graell Jordi, Lara Isabel
Departament de Quı́mica, ‡Unitat de Postcollita-XaRTA, #Serveis Científico-Tècnics, and ⊥Departament de Tecnologia d'Aliments, Universitat de Lleida , Rovira Roure 191, 25198 Lleida, Spain.
J Agric Food Chem. 2014 Apr 16;62(15):3488-95. doi: 10.1021/jf5003528. Epub 2014 Apr 4.
Although postharvest quality of fruit is greatly affected by cuticle composition, structure, and properties, very few published studies have analyzed fruit cuticle composition from a postharvest perspective. In this work, the chemical composition of waxes and cutin, major cuticular components, was analyzed in fruit cuticle samples isolated from a melting ('October Sun') and a nonmelting ('Jesca') peach (Prunus persica L. Batsch.) cultivar at harvest and after a simulated shelf-life period of 5 days at 20 °C. Cutin composition was dominated by 18-hydroxyoleic acid, whereas the triterpenoid ursolic and oleanoic acids and the alkanes n-tricosane and n-pentacosane were quantitatively prominent among the wax compounds identified. Some quantitative differences were found between both cultivars for particular compound families and in their postharvest modifications. To the best of the authors' knowledge, this is the first study characterizing the composition of the cuticle of peach fruit and describing the changes therein after harvest.
尽管果实采后的品质受角质层的组成、结构和性质的影响很大，但从采后角度分析果实角质层组成的已发表研究却非常少。在这项研究中，对从易溶（‘十月阳光’）和不易溶（‘杰斯卡’）桃（Prunus persica L. Batsch.）品种采收时以及在20℃下模拟货架期5天后分离得到的果实角质层样品中的蜡质和角质（主要的角质层成分）的化学成分进行了分析。角质的组成以18 - 羟基油酸为主，而在鉴定出的蜡质化合物中，三萜类熊果酸和齐墩果酸以及正二十三烷和正二十五烷在数量上较为突出。在两个品种之间，特定化合物家族及其采后修饰存在一些数量差异。据作者所知，这是第一项表征桃果实角质层组成并描述采收后其变化的研究。
