Method for preparing chitin and chitosan from dendrolimus punctatus larvae
A technology of chitin and chitosan, which is applied in the field of preparation of chitin and chitosan, can solve the problems of endangering pine forests, pine forest hazards, narrow market application fields, etc., and achieves the effects of easy collection, reducing the amount of hazards, and broadening the source of raw materials
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Embodiment 1
[0023] Take 1 kg of old larvae of Pinus massoniana caterpillars, soak them in 15 times the volume of 1% NaCl solution for 2 hours, filter, layer the worm bodies, each layer is not more than 2cm thick, and place them in an ordinary oven at 75°C for 6 hours. The treated larvae of Pinus massoniana caterpillars were packed into 20-mesh gauze bags, put in water and squeezed for 0.5h until the skins and contents were separated, washed with tap water, and filtered to obtain 242 g of skins. Soak the insect skin with 15 times the volume of 6% NaOH solution at 75°C for 10 hours, wash it with tap water, then soak it with 15 times the volume of 4% hydrochloric acid solution at 50°C for 7 hours, wash it with 10 times the volume, 9 % hydrogen peroxide was decolorized at 50°C for 4 hours, washed with distilled water, and dried to obtain 206 g of white flaky solid chitin. The moisture content of the product is 8.89%, the ash content is 0.93%, the nitrogen content is 6.84%, and the yield is 20...
Embodiment 2
[0026] Get 1kg of old larvae of Pinus massoniana caterpillar, detoxification treatment and worm skin separation method are the same as embodiment 1. Insect skin soaked in 15 times the volume of 8% NaOH solution at 78°C for 14 hours, washed with tap water, then soaked in 15 times the volume of 3% hydrochloric acid solution at 40°C for 8 hours, washed with tap water, washed with 10 times the volume, 10% hydrogen peroxide was decolorized at 40° C. for 4 hours, washed with distilled water, and dried to obtain 203 g of white flaky solid chitin. The moisture content of the product is 8.89%, the ash content is 0.89%, the nitrogen content is 6.78%, and the yield is 20.3%.
[0027] The chitin product was further deacetylated by soaking in 15 times the volume of 40% NaOH solution for 10 hours, washed with tap water until neutral, then treated with 5% dilute hydrochloric acid solution for 6 hours, washed with distilled water until neutral, and dried to obtain 183 g of white flakes Solid...
Embodiment 3
[0029] Get 1kg of old larvae of Pinus massoniana caterpillar, detoxification treatment and worm skin separation method are the same as embodiment 1. Soak the insect skin with 15 times the volume of 10% NaOH solution at 75°C for 12 hours, wash it with tap water, then soak it with 15 times the volume of 6% hydrochloric acid solution at 45°C for 6 hours, wash it with 10 times the volume, 10% hydrogen peroxide was decolorized at 40° C. for 4 hours, washed with distilled water, and dried to obtain 200 g of white flaky solid chitin. The moisture content of the product is 8.32%, the ash content is 0.81%, the nitrogen content is 6.59%, and the yield is 20.0%.
[0030] The chitin product was further deacetylated by soaking in 15 times the volume of 50% NaOH solution for 6 hours, washed with tap water until neutral, then treated with 5% dilute hydrochloric acid solution for 6 hours, washed with distilled water until neutral, and dried to obtain 179 g of white flakes Solid matter chitos...
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