Freshness keeping method of dry bamboo shoots

Abstract

The invention relates to a freshness keeping method of dry bamboo shoots. The polyphenol oxidase of the dry bamboo shoots is inactivated by using a vacuum microwave technology; and in a microwave energy generating area of vacuum microwave equipment, the activity of the polyphenol oxidase of the dry bamboo shoots is destroyed by ultrahigh frequency electromagnetic waves and thermal effect. Meanwhile, because the processing process is carried out under highly vacuum environment, the temperature int he microwave energy generating area cannot exceed 50 DEG C in the polyphenol oxidase inactivatingprocess. Therefore, the polyphenol oxidase can be inactivated without deepening color of the dry bamboo shoots to affect the product quality due to temperature rising. By using the technology provided by the invention to inactivate the polyphenol oxidase of the dry bamboo shoots, the whiteness and mouth feels of the processed dry bamboo shoots reach the premium grade; and the processed dry bambooshoots can be preserved for 12 months at normal temperature without changing color and deteriorating. The difficulties that the dry bamboo shoots are easy to change color and deteriorate, which perplex the producing enterprises for a long time and are to be solved, are solved; moreover, no sulfur dioxide is contained in the product.

Description

technical field [0001] The invention relates to a fresh-keeping method of dried bamboo shoots without sulfur dioxide, belonging to the field of food processing. Background technique [0002] Dictyophora is a cryptogamous fungus that parasitizes the roots of dry bamboos. Its shape is slightly like a net skirt, with a snow-white cylindrical stipe, a pink egg-shaped receptacle, and a fine white net around the top of the stipe. The shape skirt spreads downward from the cap, and is known as "Snow Skirt Fairy", "Flower of Mountain Treasures", "Flower of Fungi", "Queen of Fungi". Dictyophora is rich in nutrition, rich in fragrance and delicious in taste. It has been listed as one of the "Eight Treasures of Grass" since ancient times. [0003] Dictyophora is a rare and precious edible fungus, which was listed as a "court tribute" in history and a famous dish in state banquets in modern times. On February 21, 1972, Premier Zhou Enlai held a state banquet in the Great Hall of the Peo...

AI Technical Summary

Problems solved by technology

but, 60 Co-γ-ray irradiation for food processing is prohibited in many countries, because there is a hidden danger of radioactive isotopes in irradiated food endangering human health

[0007] At present, many Dictyophora distributors use sulfur fumigation to maintain the appearance and taste of Dictyophora. Although sulfur fumigation can inhibit the activity of polyphenol oxidase in dried Dictyophora, there are harmful substances in dried Dictyophora after sulfur fumigation. Sulfur dioxide residues are harmful to the human body, and the amount of sulfur dioxide residues is difficult to control. According to the national food safety standard GB2760-2011, the sulfur dioxide residues in dried bamboo shoots should be less than or equal to 50 mg / kg