Department of Horticulture, Division of Food Production and Society, Norwegian Institute of Bioeconomy Research (NIBIO), P.O. Box 115, NO-1431 Ås, Norway.
Department of Chemistry, Technology and Biotechnology of Food, Faculty of Chemistry, Gdansk University of Technology, 11/12 Narutowicza St., 80-233 Gdansk, Poland.
Molecules. 2022 Aug 17;27(16):5256. doi: 10.3390/molecules27165256.
Biosynthesis of phytochemicals in leaves of can be initiated by abiotic factors. The aim of the study was to investigate elicitor treatments to add value to waste of cabbage. A leaf waste fraction from industrial trimming of head cabbage was exposed to UV radiation (250-400 nm, 59 and 99 kJ∙m, respectively), photosynthetic active radiation (PAR, 400-700 nm, 497 kJ∙m), and ultrasound in water bath (35 kHz, at 15, 30 and 61 kJ∙l water), in order to improve nutraceutical concentration. UV was more effective than PAR to increase the level of flavonols (2 to 3-fold higher) and hydroxycinnamate monosaccharides (1 to 10-fold higher). PAR was three times as effective as UV to increase anthocyanins. Interaction of PAR + UV increased antioxidant activity (30%), the content of five phenolics (1.4 to 10-fold higher), and hydroxycinnamic monosaccharides (compared with PAR or UV alone). Indoles were reduced (40-52%) by UV, but the other glucosinolates (GLS) were unaffected. Ultrasound did not influence any parameters. The results are important for white cabbage by-products by demonstrating that UV + PAR can be successfully used as an effectual tool to increase important phenolics and antioxidant activity of waste fraction leaves without an adverse effect on the main GLS.
植物化学物质在叶片中的生物合成可以被非生物因素引发。本研究的目的是探索诱导处理方法，以期增加白菜废料的附加值。将来自于头部白菜工业修剪的叶片废料暴露于紫外线辐射（250-400nm，分别为 59 和 99kJ·m）、光合有效辐射（400-700nm，497kJ·m）和水浴中的超声波（35kHz，15、30 和 61kJ·l 水）下，以提高营养浓度。紫外线比光合有效辐射更有效地提高类黄酮水平（提高 2 到 3 倍）和羟基肉桂单糖（提高 1 到 10 倍）。光合有效辐射比紫外线提高三倍的花青素水平。PAR+UV 的相互作用增加了抗氧化活性（30%）、五种酚类物质（提高 1.4 到 10 倍）和羟基肉桂单糖（与 PAR 或 UV 单独作用相比）。紫外线使吲哚类物质（40-52%）减少，但其他硫代葡萄糖苷（GLS）不受影响。超声对任何参数都没有影响。这些结果对于白白菜副产物很重要，证明了 UV+PAR 可以成功地用作一种有效的工具，在不对主要 GLS 产生不利影响的情况下，增加废料叶片中重要的酚类物质和抗氧化活性。
