According to the query related public information, the yeast cells in the dry yeast flakes are in a dormant state and are not active, but they are still active. When the dry yeast flakes are mixed with water and sugar, the yeast cells will be awakened and start respiration and fermentation, which can make the dough fermented and soft, and the baked bread is softer and more delicious.
Active dry yeast is a dry yeast product that still maintains a strong fermentative ability after being squeezed, dried and dehydrated by specially cultivated fresh yeast. Squeeze the pressed yeast into thin strips or small balls, and use low-humidity circulating air to continuously dry through the fluidized bed to make the final fermentation moisture reach about 8% and maintain the fermentation ability of the yeast.
When used in the preparation of active dry yeast cells, the protein content is required to be controlled at 40% to 45%, while the content of carbohydrates, especially trehalose, is high. Since the 1970s, genetic engineering and modern drying technology have been used to produce instant active dry yeast, also known as high-activity dry yeast. Compared with active dry yeast, it contains 4% to 6% water, has small particles, and has a fast fermentation speed. It can be used directly without pre-hydration. Most of the current products are active dry yeast, and the types include active dry yeast for bread, alcohol, and wine.
①Build in areas with starch or molasses resources. Starch can be corn, cassava, potato, sweet potato, and other resources. The molasses can be either cane molasses or beet molasses.
②A place where energy is relatively cheap. It is best to have a thermal power station, which can reduce investment and is cheap, where hydropower is abundant, or a coal-producing area. Because building an active yeast factory with an annual output of 2,000 tons requires about one 1,000KVA transformer and one 8-ton boiler.
③ Regional distribution is best in the northwest or southwest region. At present, yeast factories are mainly concentrated in the southeast coast, with energy shortage and high cost. Development to the northwest and southwest can promote the deep processing of local agriculture and food industry. There is a broad market space in the southwest and northwest.
④Appropriate scale: It is advisable to build a scale with an annual output of 2,000 tons at the initial stage of construction, and then expand after stabilization. The investment for a scale of 2,000 tons is about 30 million yuan, excluding technology transfer fees. It covers an area of about 20 mu, with a construction area of about 7000m2.
⑤Environmental protection: Waste water can be used to irrigate farmland, and can also be discharged after biochemical treatment.