Fiddlehead air regulating fresh-keeping method

Abstract

A method for air-conditioned fresh-keeping of bracken, which is characterized by adopting the following steps: (1) after the bracken is harvested, it is quickly placed in a cold storage at 3-4° C. and a relative humidity of 90-95% for pre-cooling for 4-6 hours; (2) Put the pre-cooled bracken into a fresh-keeping bag with a length of 35-40cm and a width of 15-20cm. The amount of bracken in each fresh-keeping bag is 200-250g, and the bracken is in a loose state. Punch 6 to 8 holes with a diameter of 1 to 1.5 cm; (3) Put the fresh-keeping bag with bracken into the air-conditioned warehouse, and control the relative humidity in the air-conditioned warehouse to be 95±2% and the temperature to be 0±0.5 ℃, O2 concentration 5.0-7.0%, CO2 concentration 2.0-4.5%, and the rest of the gas is supplemented with N2. The invention prolongs the storage period of bracken from 1-2 days at normal temperature to more than 15 days through pre-cooling, packaging and the control of key technologies such as humidity, temperature, O2 and CO2 concentration in the stored air-conditioned warehouse. There is no quality deterioration such as browning and aging, and good product quality and marketability are maintained.

Description

technical field [0001] The invention provides a modified atmosphere preservation method for bracken, which belongs to the technical field of food preservation. Background technique [0002] Bracken is a Pteridaceae plant, and every 100 grams of young bracken contains 1.6 grams of protein, 0.4 grams of fat, 10 grams of carbohydrates, 50 kcal of calories, 1.3 grams of crude fiber, 35 mg of ascorbic acid, and 16.8 mg of carotene. Traditional Chinese medicine believes that bracken rhizomes and petiole residues are sweet and sweet, and their nature enters the spleen meridian. They can clear away heat and detoxify, smooth the intestines and laxatives, reduce qi and reduce phlegm; At the same time, because it contains active ingredients such as saponins and flavonoids, it has the effects of clearing away heat and detoxifying, diuretic, analgesic, hemostatic and insecticidal. Because wild bracken has a special fragrance, is rarely polluted and has many functions, it has become one ...

AI Technical Summary

Problems solved by technology

[0003] However, during the development process of wild bracken, especially during the post-harvest preservation process, it is extremely prone to browning, aging, and loss of nutrients.

The fresh-keeping period of low-temperature refrigeration and spontaneous air-conditioning treatment methods is only 4 to 6 days, which is difficult to meet the requirements of long-term storage and transportation; some fresh-keeping and antiseptic reagents need to be added to the plastic bag packaging for fresh bracken processing, which is different from wild bracken. The natural and pollution-free principles of bracken itself deviate from it, and it is difficult to meet the requirements of consumers