Method for increasing organic selenium proportion in selenium-enriched dehydrated fruits and vegetables

Abstract

A method for increasing the proportion of organic selenium in selenium-enriched dehydrated fruits and vegetables. It belongs to the technical field of fruit and vegetable cultivation and processing. Its main process is: firstly carry out selenium-enriching treatment on vegetables (mainly vegetables grown on the ground), early stage (seedling stage), middle stage (flowering stage or growth stage) and late stage (fruiting stage or early harvest stage) of fruits, so that Most of the harvested fruit and vegetable products had an organic selenium ratio of more than 70% in the range of total selenium content of 0.6-0.9 μg / g. After obtaining raw materials with a high proportion of organic selenium, the raw materials are routinely selected, washed, peeled, sliced, blanched to inactivate enzymes and other pretreatments, and then the method of high vacuum and medium temperature drying is used to make the organic selenium preservation rate of most selenium-rich fruits and vegetables It reaches more than 95%, the total selenium content in the product is 4.2-7.2 micrograms / gram, and the organic selenium ratio reaches more than 66.5%. The invention has the advantages that the ratio of organic selenium is significantly increased under the condition of constant total selenium content by adopting the method of spraying selenium-enriched leaves multiple times in stages; and the preservation rate of organic selenium is significantly improved by adopting a high-vacuum drying method.

Description

technical field [0001] A method for increasing the proportion of organic selenium in selenium-enriched dehydrated fruits and vegetables. The invention belongs to the technical field of fruit and vegetable cultivation and processing and relates to the processing of selenium-enriched food. Background technique [0002] At present, there are mainly two methods of enriching selenium in fruits and vegetables: 1) the method of spraying selenium enrichment on leaves or plants, and 2) the method of root system absorption after soil selenium enrichment. The former can achieve quantitative selenium enrichment, which is suitable for the part of selenium-enriched products exposed to the soil; while the latter is very difficult to achieve quantitative selenium enrichment due to the uncertainty of the soil itself. In order to obtain selenium-enriched raw materials with a certain proportion of organic selenium, Zhang Min et al. (1997, Journal of Wuxi University of Light Industry) sprayed ...

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Problems solved by technology

In order to obtain selenium-enriched raw materials with a certain proportion of organic selenium, Zhang Min et al. (1997, Journal of Wuxi University of Light Industry) sprayed different concentrations of inorganic selenium on green peppers, eggplants, cucumbers and kidney beans at different growth stages, and obtained It is concluded that the treatment at the flowering stage has a better effect on organic selenium conversion, but the disadvantage is that due to the use of one-time selenium enrichment, the proportion of organic selenium in the four fruits and vegetables is still low, only 40.8%-50.6%, of which 50.6% is selenium-enriched agronomy The proportion of organic selenium that can only be achieved after optimization

But this method is owing to adopting the limitation of dehydration method, and the preservation rate of processing process is low, and the organic selenium ratio of final product is low