Gradient pre-cooling method suitable for red globe grapes

Abstract

The present invention discloses a gradient pre-cooling method suitable for red globe grapes. An orthogonal experiment method is used to optimize processes, and pre-cooling efficiency is improved by atwo-stage gradient differential pressure pre-cooling method. Wind temperature is -3 DEG C and differential pressure wind speed is 1.0 m / s in a rapid pre-cooling stage, and a center temperature of grape fruit granules is pre-cooled to 3 DEG C. The differential pressure effect is even, an interaction between the differential pressure pre-cooling wind temperature and wind speed is obvious, a coolingrate can be increased by 1.23-1.75 times; no cold damage occurs in the pre-cooling period, and green color fading and dry shrinkage of ear stalks and fruit stalks are not obvious in the pre-cooling period; and temperature fluctuations of the fruit ears of the red globe grapes are small, and respiratory intensity and humidity fluctuations are relatively stable in the pre-cooling treatment. The gradient pre-cooling method solves a problem that the red globe grapes are easy to rot caused by improper pro-cooling preservation after the red globe grapes are picked, and has wide practicality and development value in the field of preservation of fruits and vegetables.

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...

AI Technical Summary

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

Images