The current study reports the anthocyanin profile of purple 'supersweet' sweetcorn, recently developed from purple Peruvian maize, and the effect of kernel maturity on anthocyanin accumulation. Twenty anthocyanin compounds, consisting of cyanidin-, peonidin-, and pelargonidin-based glucosides, were identified and quantified in purple- and reddish-purple-pericarp sweetcorn accessions. For the first time, four isomers of cyanidin-3-malonylglucoside, four isomers of pelargonidin-3-malonylglucoside and two to three isomers each of cyanidin-3-dimalonylglucoside, peonidin-3-malonylglucoside and pelargonidin-3-dimalonylglucoside, were identified in the new pigmented sweetcorn. While cyanidin-based glucosides predominated in the purple-pericarp accession, pelargonidin-based glucosides predominated in the reddish-purple accession. Total anthocyanin concentration increased significantly (p < 0.05) during the optimum sweetcorn eating period (23 to 28 DAP) and continued to increase as the kernels further matured (>28 DAP). As kernels continued to mature, pigment coverage across the pericarp progressively increased from a small spot at the stigma end of the kernel, to gradually spreading over the entire kernel.

中文翻译：

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紫色-果皮超甜甜玉米中花色苷的组成和仁发育过程中的变化。

当前的研究报道了最近从秘鲁秘鲁紫色玉米开发的紫色“超甜”甜玉米的花色苷谱，以及籽粒成熟度对花色苷积累的影响。已鉴定并定量了20种花青素化合物，其中包括基于花青素，peonidin和pelargonidin的苷，并在紫色和带红色紫色的果皮甜玉米品种中进行定量。首次鉴定出花青素3-丙二酰葡萄糖苷的四个异构体，pelargonidin-3-丙二酰葡萄糖苷的四个异构体以及cyanidin-3-二烯丙基葡糖苷，peonidin-3-丙二酰基葡糖苷和pelargonidin-3-十二烷酰葡糖苷各2至3个异构体。新的色素甜玉米。紫皮果皮中以花青素为基的糖苷为主，红紫皮中以青草皮素为基的葡糖苷为主。在最佳甜玉米食用期（23-28 DAP）期间，总花色苷浓度显着增加（p <0.05），并随着籽粒进一步成熟（> 28 DAP）而持续增加。随着果仁的不断成熟，果皮上的色素覆盖率从果仁柱头末端的一个小点逐渐增加，逐渐扩散到整个果仁。