Preparation method of frozen noodles containing pre-gelatinized hydroxylpropyl starch

[0017] a, preparation of pregelatinized hydroxypropyl starch:

[0018] Take by weighing 100g tapioca starch, add 300mL the distilled water that adds the anhydrous sodium sulfate of starch dry weight 12% and the sodium hydroxide of 1.2%, be made into the starch milk of concentration 30%, after stirring, put into reactor, And put the reactor into a water bath, slowly add 13% propylene oxide with a dry basis weight of starch with a pipette at a temperature of 18°C, seal it, and stir for 30 minutes at this temperature, so that the propylene oxide and Mix the starch evenly, then transfer it to a water bath at 50°C and stir for 20 hours, adjust the pH value to 6.7 with 3% dilute hydrochloric acid, transfer it to a centrifuge tube, centrifuge at a speed of 5000rpm / min for 10min, and wash three times by centrifugation. Then vacuum-dry at 60°C and pulverize to obtain hydroxypropyl starch; prepare hydroxypropyl starch with water to make a starch slurry with a concentration of 5%, stir at

[0022] a, preparation of pregelatinized hydroxypropyl starch:

[0023] Take by weighing 100g tapioca starch, add 250mL the distilled water that adds the anhydrous sodium sulfate of starch dry basis weight 15% and the sodium hydroxide of 1.2%, is made into the starch milk of concentration 40% (all the other steps are identical with embodiment 1);

[0024] b. The difference between this step and step b of Example 1 is that the added amount of the pregelatinized hydroxypropyl starch is 1.5% of the flour weight.

[0025] After the product prepared in this example was frozen and stored at -18°C for one month, the quality of the finished product after cooking was significantly improved. The noodles were milky white in color, good in elasticity, and smooth in taste. The quality was the same as that of fresh noodles, and the dissolution rate was small. The specific texture parameters of the frozen noodle product (sample) prepared by this method and the ordinary frozen noodle product (bla