树仔菜VC含量分析及变化规律

优化树仔菜VC含量的测定方法并探讨不同条件下树仔菜中VC含量的变化规律。在GB 6195-1986《水果、蔬菜维生素C含量测定：2,6-二氯靛酚滴定法》的基础上，研究手工研磨与组织捣碎机捣碎样品前处理方法，分析贮存时间对树仔菜VC含量的影响、树仔菜不同器官组织VC含量的差别以及施用酸性土壤改良肥对树仔菜产品VC含量的影响、不同月份树仔菜VC含量的变化等。结果表明，研磨法制样测得的VC含量高于捣碎法；树仔菜产品和匀浆样品中VC随着贮存时间的延长而减小，加草酸打浆的树仔菜匀浆样品VC测定结果高于不加草酸的匀浆样品；树仔菜不同部位VC比较结果为叶片＞嫩茎，施用酸性土壤改良肥以及5～6月份采摘的树仔菜VC含量较高。

Changes in Vitamin C Content in Sauropus androgynus (L.) Merr.

The aim of this study was to develop an optimize method for the determination of vitamin C (VC) in Sauropus
androgynus (L.) Merr. and investigate changes in VC content in the vegetable under different conditions. The experimental
conditions for manual and mechanical grinding (using a blender) as sample pretreatments for VC determination were
established according to the Chinese national standard GB 6195-1986. The effects of postharvest storage time, plant
organs, acidic soil fertilizer application, and harvest time on VC content in Sauropus androgynus (L.) Merr. were analyzed.
The results showed that the VC content determined using manual grinding was higher than that obtained using mechanical
grinding. The VC content in the plant and its homogenate samples decreased with increasing storage time. Homogenates
with added oxalic acid were determined to contain higher amounts of VC than blank control. The leaves and young stems of
Sauropus androgynus (L.) Merr. contained decreasing amounts of VC, and higher levels of VC were obtained by acidic soil
fertilizer application and detected in samples harvested in May and June.