Departamento de Ingeniería Genética, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), Unidad Irapuato, Km 9.6 Libramiento Norte, Irapuato, Guanajuato 36824, Mexico.
Laboratorio Nacional PlanTECC, Km 9.6 Libramiento Norte, Irapuato, Guanajuato 36824, Mexico.
J Agric Food Chem. 2020 May 27;68(21):5980-5994. doi: 10.1021/acs.jafc.9b06336. Epub 2020 May 13.
Corn seeds contain natural pigments and antioxidants, such as the molecular variants of flavonoids and carotenoids. The aleurone and pericarp tissues from pigmented genotypes were extracted for metabolic fingerprinting and evaluated using UV-vis and mass spectrometry (MS). MS ionomic fingerprints classified samples according to genetic background and kernel color. The MS/MS fragmentation pattern (Daughter and Neutral Loss methods) allowed the tentative identification of 18 anthocyanins with glycosyl, malonyl, and succinyl moieties, including 535 / for cyanidin-3--(6″-malonyl-glucoside) and 621 / for cyanidin-3--(3″,6″-dimalonyl-glucoside). We also detected 663 / for pelargonidin-3--(disuccinyl-glucoside) and 633 / for peonidin-3--(disuccinyl-glucoside). Cyanidin-based anthocyanins were the most abundant in dark purple colored kernels, while pelargonidins predominated in the red-pink kernels of the "" landrace. Grains of "" had a simultaneous pigmentation of aleurone and pericarp, while Vitamaize had purple pigmentation only in the aleurone layer. Most landraces had a white endosperm, while Vitamaize had a yellow endosperm and a dark seed coat. We conclude that Vitamaize grains contain both carotenes and anthocyanins, and therefore it is proposed as a nontransgenic agronomically improved variety of tropical purple maize, a good source for organic superfoods.
玉米种子含有天然色素和抗氧化剂,如类黄酮和类胡萝卜素的分子变体。对有色基因型的糊粉层和果皮组织进行提取,用于代谢指纹图谱分析,并使用紫外-可见分光光度法和质谱法(MS)进行评估。MS 离子组指纹图谱根据遗传背景和籽粒颜色对样品进行分类。MS/MS 碎片模式(子离子和中性丢失方法)允许对 18 种带有糖基、丙二酰基和琥珀酰基的花色苷进行推测性鉴定,包括 535 / 矢车菊素-3-(6″-丙二酰基-葡萄糖苷)和 621 / 矢车菊素-3-(3″,6″-二丙二酰基-葡萄糖苷)。我们还检测到 663 / 天竺葵素-3-(二琥珀酰基-葡萄糖苷)和 633 / 芍药素-3-(二琥珀酰基-葡萄糖苷)。深紫色籽粒中以飞燕草素为基础的花色苷含量最丰富,而红色-粉红色籽粒中以天竺葵素为主。“”地方品种的籽粒糊粉层和果皮同时着色,而 Vitamaize 仅在糊粉层呈现紫色。大多数地方品种的胚乳呈白色,而 Vitamaize 的胚乳呈黄色,种皮呈深褐色。我们得出结论,Vitamaize 籽粒既含有类胡萝卜素又含有花色苷,因此它被提议作为一种非转基因的、具有农业改良特性的热带紫色玉米品种,是有机超级食品的良好来源。