A kind of preparation method of frozen tofu based on ultrasonic pretreatment
A production method and pretreatment technology are applied in the production field of frozen tofu based on ultrasonic pretreatment, which can solve the problems of reduced aspartic acid and cystine content, recovery, general chewability, and large pore size, etc. Loss of amino acids, excellent chewability, improved uniformity
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Embodiment 1
[0023] Follow these steps to make frozen tofu:
[0024] (1) Put the tofu made from Anhui soybeans into 5 times the weight of water, place it in an ultrasonic processor with an ultrasonic frequency of 33KHz and a power of 150W for ultrasonic treatment for 30 minutes, take it out and rinse it with distilled water for 10 seconds to obtain pretreated tofu ;
[0025] (2) the moisture content of the pretreated tofu obtained in step (1) is controlled at 75%, and then cut into tofu cubes whose length, width and height are 2cm;
[0026] (3) Place the tofu cubes obtained in step (2) on a tray, the distance between every two tofu cubes in the tray is 3cm, freeze the tray at -5°C for 4 hours, and then ripen at -2°C for 20 Hours, after drying for 2 hours at 20°C, frozen tofu was obtained.
Embodiment 2
[0028] Follow these steps to make frozen tofu:
[0029] (1) Put the tofu made from Anhui soybeans into 5 times the weight of water, place it in an ultrasonic processor with an ultrasonic frequency of 33KHz and a power of 150W for ultrasonic treatment for 30 minutes, take it out and rinse it with distilled water for 10 seconds to obtain pretreated tofu ;
[0030] (2) the moisture content of the pretreated tofu obtained in step (1) is controlled at 70%, and then cut into tofu cubes whose length, width and height are 3cm;
[0031] (3) Place the tofu cubes obtained in step (2) on a tray, the distance between every two tofu cubes in the tray is 4cm, freeze the tray at -4°C for 4 hours, and then ripen at -2°C for 20 Hours, after drying for 2 hours at 20°C, frozen tofu was obtained.
Embodiment 3
[0033] Follow these steps to make frozen tofu:
[0034] (1) Put the tofu made from Anhui soybeans into 5 times the weight of water, place it in an ultrasonic processor with an ultrasonic frequency of 33KHz and a power of 150W for ultrasonic treatment for 30 minutes, take it out and rinse it with distilled water for 10 seconds to obtain pretreated tofu ;
[0035] (2) the moisture content of the pretreated tofu obtained in step (1) is controlled at 65%, and then cut into tofu cubes whose length, width and height are 4cm;
[0036] (3) Place the tofu cubes obtained in step (2) on a tray, the distance between every two tofu cubes in the tray is 5cm, freeze the tray at 0°C for 4 hours, and then ripen at -2°C for 20 hours , and dried at 20° C. for 2 hours to obtain frozen tofu.
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