A Gradient Pre-cooling Method Applicable to Red Globe Grapes

Abstract

The invention discloses a gradient pre-cooling method suitable for red globe grapes. The process is optimized by an orthogonal experiment method, and the pre-cooling efficiency is improved through a two-stage gradient differential pressure pre-cooling method. The air temperature in the rapid pre-cooling stage adopts -3°C , the differential pressure wind speed is 1.0 m / s, the center temperature of the grape fruit is pre-cooled to 3°C, the differential pressure effect is uniform, the interaction between the differential pressure pre-cooling air temperature and wind speed is obvious, and the cooling rate can be doubled by 1.23~1.75. During this period, the grapes did not suffer from chilling damage, the ear stems and fruit stems faded in color, and the drying shrinkage was not obvious. The temperature fluctuation range of the red globe grape ears treated with precooling was small, and the respiration intensity and humidity fluctuations were relatively stable. The problem of disease and rot easily caused by improper preservation has extensive practicality and development value in the field of fruit and vegetable preservation.

Description

technical field [0001] The present invention mainly relates to the technical field of fresh-keeping of fruits and vegetables, in particular, the present invention relates to the technical field of a red globe grape precooling method. Background technique [0002] Red Globe grape, commonly known as red grape, is a Eurasian species native to California, USA. It is a grape variety bred by researchers at California State University in the 1970s through hybridization experiments. Since the introduction of this variety in my country in 1987, it has been cultivated in most areas of North China and Northwest China very well, with excellent fruit quality, late maturity, storage and transportation resistance, and high yield. It is the first choice for high-quality and high-efficiency grape varieties. The fruit of Red Globe grape is round or oval, with an average grain weight of 11-14 grams, and a maximum of 23 grams. The better fruit can reach the size of a table tennis ball. The frui...

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Problems solved by technology

[0005] For the current pre-cooling process of Red Globe grapes, under the premise of no commercial rate evaluation, the pre-cooling process determined only by the speed of pre-cooling will have technical problems such as too low pre-cooling temperature causing fruit chilling damage and uneven differential pressure pre-cooling , the present invention aims to provide a gradient precooling method suitable for red globe grapes. The process is optimized by the orthogonal experiment method, and the precooling efficiency is improved through the two-stage gradient differential pressure precooling method. The differential pressure effect is uniform, and the differential pressure precooling The interaction between cold wind temperature and wind speed is obvious, and the cooling rate can be doubled by 1.23 to 1.75. During the pre-cooling period, there is no chilling damage to the grapes. The color of the ear stems and fruit stems is green, and the drying shrinkage is not obvious. The temperature of the pre-cooling treatment of Red Globe grape ears fluctuates The range is small, the respiratory intensity and humidity fluctuations are relatively stable, and it solves the problem of rot easily caused by improper pre-cooling storage after picking Red Globe grapes. It has wide practicability and development value in the field of fruit and vegetable preservation

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