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Anonymous users2024-01-24In distillation, pressing and extraction, carotene cannot be extracted by distillation due to its poor water solubility and volatility and high melting point. Because pressing cannot effectively destroy the chromosomes and chloroplasts of carrots, they cannot be extracted by pressing method. Since carotene is easily soluble in organic solvents such as petroleum ether, carotene can be extracted by extraction. In distillation, pressing and extraction, carotene cannot be extracted by distillation due to its poor water solubility and volatility and high melting point. Because pressing cannot effectively destroy the chromosomes and chloroplasts of carrots, they cannot be extracted by pressing method. Since carotene is easily soluble in organic solvents such as petroleum ether, carotene can be extracted by extraction.
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Anonymous users2024-01-23Carotene is a fat-soluble substance that is mainly found in chromosomes and chloroplasts and has a high melting point.
Distillation, pressing, and extraction methods are commonly used to extract biological substances.
In distillation, pressing and extraction, carotene cannot be extracted by distillation due to its poor water solubility and volatility and high melting point. Because pressing cannot effectively destroy the chromosomes and chloroplasts of carrots, they cannot be extracted by pressing method. Since carotene is easily soluble in organic solvents such as petroleum ether, carotene can be extracted by extraction.
Organic solvents include water-soluble organic solvents (such as ethanol, acetone, etc.) and water-insoluble organic solvents (such as petroleum ether, ethyl acetate, benzene, ether, etc.). Ethanol and acetone cannot be used (can, cannot) be used for carotene extraction. The reason is that ethanol and acetone in the extraction can be miscible with water and affect the extraction effect.
Among the five organic solvents of petroleum ether, ethyl acetate, ether, benzene and carbon tetrachloride, petroleum ether has the highest boiling point and is not easy to volatilize during heating extraction, so it is most suitable as an extractant for the extraction of carotene.
Fill the balcony with 30 cm -40 cm, the soil layer shall not be less than 30 cm, and then fertilize, loosen the soil, water, sow carrot seeds in the soil, wait for it to emerge and germinate, after germination, leave seedlings and weed, post-management should pay attention to more watering and fertilization, so that you can plant normally, carrots are relatively long, so the soil layer is better to be thicker.
1. Seed selection and disinfection.
Choose seeds with full grains and uniform size, soak them in cold water for 12 hours, then soak them in water at about 55 for 2 4 hours, during which time the water is constantly heated inside to maintain the temperature, and the seeds are stirred from time to time with a wooden stick to make them evenly heated. Then the seeds are removed, drained, and soaked in water for 15 25 hours for 24 hours, then removed and drained, and dried in the sun until semi-dry. >>>More
The main ingredient for the preparation of carrot cake.
Flour (300 grams). >>>More
It mainly depends on how many side dishes you want to make! Cucumbers and kelp can be used as their own cold side dishes, carrots can be shredded and sliced as side dishes, if you want to make a side dish, you can follow the following methods: >>>More
Commonly used decorative materials are:
Carrots are beautiful in the heart. >>>More