A liquid nitrogen spray type quick-freezing method for fresh Cordyceps sinensis
A technology for fresh Cordyceps sinensis and Cordyceps sinensis is applied in the field of liquid nitrogen spray type quick freezing of fresh Cordyceps sinensis, which can solve the problems of decreased freshness of Cordyceps sinensis, high soluble protein content, low polyphenol oxidase activity, etc., and achieves low weight loss rate and soluble protein content. The effect of high, low polyphenol oxidase activity
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[0045] After obtaining the quick-frozen Cordyceps sinensis, the present invention sprays a preservative on the quick-frozen Cordyceps sinensis; the preservative includes 30-100 mg / mL Cordyceps mycelium extract, 50-200 mg / L chitosan oligosaccharide, 100-200 mg / L Antimicrobial Peptides and Water. In the present invention, the function of the fresh-keeping agent is to inhibit the growth of bacteria on the surface of the sample and prevent the sample from spoiling during the fresh-keeping process. The antistaling agent of the present invention preferably includes 50-70 mg / mL of Cordyceps mycelium extract. In the present invention, the function of the Cordyceps mycelium extract is an antibacterial antistaling agent, which inhibits the growth of bacteria during the preservation process. In the present invention, the Cordyceps mycelium extract includes guanine, cordycepin, hypoxanthine, cytidine, xanthine and adenosine. In the present invention, the preparation method of the Cordyc...
Embodiment 1
[0054] (1) Washing with running water: Clean the head, sporocarpus and worm body of the Cordyceps sinensis with soil collected from the place of production with linear running water at a temperature of 0°C.
[0055] (2) Ultrasonic cleaning: the cleaned Cordyceps sinensis was placed in a 0.5% calcium lactate solution, ultrasonically cleaned 5 times (power 250W, frequency 120Hz, temperature 0°C, time 5min / time), and drained.
[0056] (3) Soaking: Soak in cryoprotectant for 2min, cryoprotectant: 0.5mol / L propylene glycol, 3mmol / L sorbitol, 3mmol / L iso-Vc, 9μmol / L phytic acid, L-cysteine at a concentration of 0.8 mg / kg.
[0057] (4) Quick-freezing: use a liquid nitrogen spray quick-freezing machine, multi-stage freezing procedure, drop from ambient temperature to -20°C in 1 minute, drop to -60°C in 2 minutes, and keep the temperature for 15 minutes.
[0058] (5) Spray preservative: containing 100mg / mL Cordyceps mycelium extract, 200mg / L chitosan oligosaccharide, 200mg / L antimic...
Embodiment 2
[0062] (1) Cleaning with running water: Clean the head, sporocarpus and worm bodies of the Cordyceps sinensis with soil collected in the production area sequentially with linear running water at a temperature of 10°C.
[0063] (2) Ultrasonic cleaning: place the cleaned Cordyceps sinensis in a 0.1% calcium lactate solution, ultrasonically clean once (power 1200W, frequency 40k HzHz, temperature 10°C, time 10min / time), drain .
[0064] (3) Soaking: Soak in cryoprotectant for 5 minutes, cryoprotectant: 0.3mol / L propylene glycol, 1mmol / L sorbitol, 1mmol / L iso-Vc, 6μmol / L phytic acid, L-cysteine at a concentration of 0.4 mg / kg.
[0065] (4) Quick-freezing: use a liquid nitrogen spray quick-freezing machine, multi-stage freezing procedure, drop from ambient temperature to -40°C in 3 minutes, drop to -90°C in 4 minutes, and keep the temperature for 10 minutes.
[0066] (5) Spray preservative: containing 30mg / mL Cordyceps mycelium extract, 50mg / L chitosan oligosaccharide, 100mg / L ...
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