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the freeze-drying process comprises the following steps, preparing a liquid and filling at the temperature of 20-30 , putting a sample into a freeze dryer, quickly reducing the temperature of a plate layer to-40 , preserving heat for 1h, when the temperature of a clapboard is-10 +/-2 , preserving heat for 1h, quickly reducing the temperature of the plate layer to-40 within 1h, preserving heat for 4h, transferring to a cold trap at-50 , vacuumizing to below 10Pa, firstly reducing the temperature of the plate layer to-5 , preserving heat for 2h, then heating the plate layer to 10 within 3h, when a product is at 0 , starting to increase the temperature of the plate layer to 40 , and when the product is increased to 30 , preserving heat for 5 h
This is because the value changes over time
Application of IAA or its analogs may also enhance metal tolerance of the plants against such as cadmium and arsenic which causes agricultural problems worldwide
& Tang, D
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