Exploration on the Process of Improving the Quality of Qingqu Wine Daqu

Daqu is an important saccharification and fermentation agent for traditional solid-state fermented wine, and it is also an important source of aroma constituents in wine. Qinghai Mutual Alum Wine Co., Ltd. has been making medium and low temperature Daqu from green barley and peas for the production of barley wine. However, the medium-low temperature Daqu made has a great restriction on improving the taste of barley wine and improving the quality of barley wine, especially the taste of different grades is difficult to distinguish. Therefore, Qinghai Mutual Alum Wine Company uses different raw materials and different culture temperature to make songs to improve the quality of Qinglan wine Daqu.

First, prepare materials

1, Qinglan: grain storage, in line with the provisions of GB11760.

2, peas: grain storage, in line with the provisions of GB/T10460.

3, wheat: commercially available, in line with the provisions of GB1351.

4, water: brewing water, in line with the provisions of GB5749.

Second, the operation process

1. Selection and proportioning of raw materials: After the selected materials are selected and removed, the ratio is determined according to the plan.

2. Mixing and pulverizing: After the raw materials are uniformly mixed, they are ground twice by a roller mill, the first time is thicker, and the second time is finer. The pulverization degree of the koji is required to be no more than 30% of the fine powder passing through the 40-mesh sieve.

The smashing requirement is suitable for the thickness. If the squeezing is too thick, the water is easily lost. The compression of the embryo is not tight enough, and the microbial growth and reproduction is poor, resulting in weak saccharification and fermentation, affecting the quality of the finished wine, and excessive water content, causing the water or the heat of the heart. The finished product is succulent and succulent, and the taste is not correct, which brings odor to the finished wine.

3, adding water mixture: mixing water is 26% -36% of the amount of koji, the water is heated to about 40 °C with steam, the mixture is evenly mixed to make the temperature of the raw material reach 23 ° C - 26 ° C, after mixing The principle of kneading the dough is not sticky, which is beneficial to the uniform absorption of raw materials.

4. 曲曲: Adjust the running speed and pressing strength of the koji machine before making the song, so that the produced slabs are smooth on six sides, the four corners are full, no white and dry noodles, soft and hard, hand pressing the curved embryo Not loose, there is a sense of solidity, and the thickness is consistent.

5, the embryo into the house: before the embryo enters the house, the room is cleaned, and the ground is paved with fresh gluten.

The curved embryos placed in the room are arranged side by side, the spacing of the curved embryos is 2cm - 3cm, the row spacing is 3cm - 4cm, and the 3rd - 4th layers are stacked. Each layer is separated by bamboo curtains and arranged in a "good" shape, requiring a uniform spacing. The left and right are neat, the horizontal and vertical ends are correct, and the principle of the spacing of the curved embryos should be adhered to the winter near summer.

Culture of curved embryos: The management of the culture of the embryo must be done with "three levels" and "two".

The "three customs" is on the mildew, the fire is off, and the fire is closed; the "two" is the need for hot and cold, light and heavy, and soft and hard. The principle of the top of the soft curve, the two sides of the hot song, the middle of the cold curve, and the principle of warming control of the front fire, the medium fire, and the rear fire; the three times of the song during the embryo culture are the pre-management and medium-term management. And post management.

(1) Early management - management of mildew and cool mold stages

After the embryo enters the house, close the door and window, keep the room temperature at 25 ° C - 30 ° C for 1 day - 2 days, when the temperature of the product rises to 35 ° C - 37 ° C, the surface of the curved embryo grows many white hyphae spots, which is called Mildew, the optimum temperature for mildew is 35 °C - 38 °C. At this time, the music is turned over, and the pitch of the song is increased, and it is still arranged in a "good" shape. After the buckling, the mold is carried out, and the embryo is piled up to 4 layers, and the cool mold time is about 12 hours. When the cold mold is used, the convective wind is not allowed to prevent the curved skin from being blown directly by the cold wind, and the dry crack is generated. The temperature of the mold in the cool mildew period is controlled at 28 ° C - 34 ° C.

(2) Mid-term management - management during the boom and fire periods

After the cool mold, close the door and window and enter the tide stage. After 2 days to 3 days, the temperature of the product gradually rises to 38 °C - 45 °C. At this time, it is necessary to carry out the moisture in a timely manner. When the temperature of the product continues to rise to 50 °C-55 °C, it enters the fire stage, and the second time is maintained for 2 days to 3 days. The curved embryo is superimposed from 4 layers to 6 layers. The most important part of the fire period is to maintain the uniform evaporation of moisture and heat in the curved embryo. Attention should be paid to the opening and closing of the doors and windows to adjust the temperature and the line spacing between the curved embryos to prevent the temperature of the curved embryo from being too high during the fire period, resulting in burnout.

(3) Post management

After the fire period, the embryo is gradually dried, the temperature of the product slowly drops to 31 ° C - 33 ° C into the after fire stage, the third time to turn, reduce the spacing and line spacing of the curved embryo, the fire in the post-fire period requires neither burning Do not rush, divide the fire twice: the first close; close down the temperature. Then close the doors and windows, stop the music for the song, and the temperature of the heart drops below 30 °C.

After 5 days, the window was opened to cool, and the embryo was piled up to 7 layers, ventilated, and the income was checked after 3 days. It takes about 15 days to 20 days from the time when the embryo enters the room to the room.

7, storage, aging

The melody of the warehousing was put on, which promoted the evaporation of the water.

8, smash, out of the warehouse

When the large koji of the warehousing is pulverized, it is preferable to pass the fine powder to about 20% of the 0.3 mm sieve hole.