What are the basic principles for selecting raw materials

First, the purpose of raw material selection.

The purpose of material selection is to make it more in line with the requirements of eating and cooking through the comprehensive selection of raw materials such as quality, variety, part, and hygienic status. The task of selection is first to ensure that it is eaten, which is the most basic requirement, and at the same time, it is necessary to meet people's food needs, that is, to ensure that the dishes meet the cooking requirements of color, aroma, taste and shape, and there are specific requirements in the following aspects.

1 Provide reasonable nutrients.

Through the selection of varieties and quantities, the nutrients between raw materials can be supplemented with each other, so as to meet the normal needs of the human body and achieve the needs of a balanced diet.

2. Ensure the safety of consumption.

Some raw materials are polluted by harmful substances in the process of growth, so that the food contains substances that are harmful to the human body, and some raw materials themselves contain certain toxicity, such as wild mushrooms, if you are not careful when choosing, it will lead to poisoning.

3. Ensure the need for the shape and color of the dish.

The raw materials are complete in form and bright in color, which is the prerequisite for ensuring the formation and color of the dishes, and the raw materials that are incomplete or discolored are difficult to make up for by processing methods, thus affecting the beauty of the dishes.

4. Provide a good flavor foundation to make the flavor of the raw material more prominent.

The quality of the raw materials, especially the parts, contains moisture, protein, fat and tissue structure.

All of them are different, and the textures and tastes they express are also different.

5. It is more conducive to the processing of raw materials.

The selection of cooking ingredients is generally preferably fresh, but when it comes to making specific dishes, it is necessary to be flexible and grasp the specific situation. For example, the selection of whole fish bones, generally do not choose live fish, because it is not conducive to bone, nor is it conducive to frying in the pot, the selection of materials for rubber products is generally the same, but the fresher the egg raw materials, the better, in order to facilitate foaming and coagulation.

6 More conducive to the requirements of cooking.

The cooking process is the process of ripening and human taste of raw materials, and different raw materials and different parts affect the choice of cooking methods, such as chicken breast.

Generally, the method of stir-frying should be used, and the method of roasting or frying chicken thighs is generally used.

The demand under experimental conditions is not large, the main consideration of safety and conversion rate, industrial production conditions are the pursuit of economic benefits, the primary consideration is the trade-off between raw materials and yield, try to choose cheaper, but if you can get a better yield, the benefits of the product are greater than the cost of raw materials, of course, it is to choose raw materials that can obtain high benefits, and the safety can not be ignored, of course, on these basis, it is also necessary to consider the storage, transportation and other factors of raw materials、、、 Hope you are satisfied.

1。Selects in accordance with relevant laws and regulations; 2.Choose according to the hygienic standards for consumption; 3.Choose according to the principle of nutritional balance;

4.Choose according to the requirements of the cooking; 5.The selection is based on the physical characteristics of the raw materials.

Dear, I am glad to answer your answer: The general principles of material selection are as follows.

First, the conflict of materials in the hall should be selected to be inhibited by the function of other materials. For example, plastering mortar on the wall has the function of absorbing moisture when the temperature is high and releasing moisture when the temperature is low, which is called breathing function to regulate the indoor humidity. If you also put wallpaper on this kind of wall with a hidden breathing function, then the effect of breathing will be significantly reduced.

Second, environmental protection and low pollution in the selection of materials, to pay attention to whether the material is harmful to the body, there are a large number of polymer decoration materials on the market, these new materials will produce the air to bring hidden pollution of the gas, some wallpaper emitting smell disgusting. 3. Pay attention to fire safety When choosing decoration materials, it is best to pay attention to the flammability of the materials, and you must be careful about this. In our country's market, there is a lack of necessary standards for decoration materials.

In the process of home decoration, especially the ceiling material, it is easy to ignore the fire hazard, and the kitchen is a place where fire is often used, so try to choose inorganic finishing materials.

Principles: 1. The performance of materials - the most important basis for material selection; When designing mechanical parts and selecting materials, the requirements for the mechanical properties of materials should be found out according to the working conditions and damage forms of the parts.

2. Process performance of materials; The processing technology performance of the material mainly includes: casting, pressure machining, cutting processing, heat treatment and welding. The quality of its processing performance directly affects the quality, production efficiency and cost of parts.

3. Economic performance of materials; The cost of each machine is an important indicator of labor productivity and product.

Materials are always associated with certain occasions of use, and can be composed of one or more kinds of substances. The same substance, due to different preparation methods or processing methods, can become materials of different types and properties with different uses.

1. Pay attention to the conflict of materials. The functions of materials must not conflict with each other and inhibit each other.

2. Environmental protection and low pollution. Pay attention to whether the material will pollute the air and be harmful to the body.

3. Pay attention to fire safety. Try to choose inorganic finishing materials to eliminate the potential danger that may lead to fire.

Attention should be paid to the following aspects in the selection of materials:

1) It is necessary to grasp the production season of raw materials

2) Familiar with the origin of raw materials

3) Familiar with the use of different parts of various raw materials

4) Pay attention to the selection and identification of the quality of various raw materials

Do not use livestock, poultry, aquatic products, etc. with germs.

Quality factor, quality is the survival of the first chain, the use value of the product is based on product quality, it determines the quality of the final consumer goods, and affects the market competitiveness and market share of the product. Therefore, quality is an important factor in choosing the best quotient. Factors, low, means that enterprises can reduce the cost of their production and operation, improve the competitiveness of enterprises and increase profits, has an obvious effect, is an important factor in the choice of business.

However, the lowest supplier is not necessarily the most suitable, and many factors such as product quality, delivery time, and transportation costs need to be considered. The punctuality factor of delivery, whether the products can be shipped on time at the agreed time and place directly affects the continuity of production and activities of the enterprise. It will also affect the inventory level of the ** chain at all levels, and then affect the speed of the company's response to the market, interrupting the production plan of the manufacturer and the sales plan of the seller.

In order to survive and develop in the fierce competition, the products produced by enterprises must be diversified to meet the needs of consumers and achieve the purpose of occupying the market and obtaining profits. The diversification of products is based on the variety flexibility of the first business, which determines the type of consumer goods. Other influencing factors, including design capabilities, special process capabilities, overall service levels, project management capabilities, and other factors.

The main criterion is quality, which accounts for about the quality factor of the enterprise, followed by **. The principle of choosing a businessman, the basic criterion of business development is that the principle is the principle of paying equal attention to quality, cost, delivery and service. Among the four, the quality factor is the most important, first of all, to confirm whether the supplier has established a stable and effective quality assurance system, and then to confirm whether the supplier has the equipment and process capacity to produce the specific products required.

The second is cost and cost, to use the value engineering method to analyze the cost of the products involved, and achieve cost savings through win-win negotiations. In terms of delivery, it is necessary to determine whether the first business has sufficient production capacity, whether human resources are sufficient, and whether there is potential to expand production capacity. Last but not least, it is also very important to have a record of pre-sales and after-sales service for the best merchants.

Analyzing the market competition environment, enterprises must know what the current product demand is, what the type and characteristics of the product are, so as to confirm the needs of customers and confirm whether there is a need to establish a first-class relationship. If the relationship has been established, it is necessary to confirm the necessity of the change of the cooperative relationship according to the change of demand, analyze the current situation of the existing business, and summarize the problems existing in the enterprise.

When determining the amount of raw materials, the evaluation performance or optimal dosage should be calculated according to the database basic formula variable test and contour test, using the best number of parts, proportional combination method and other methods. Optimal portion method. Dosage to find the best performance from the base recipe variable test.

Relative dosage method. All material dosages are relative, and there are relative dosages for the same system material and for different system materials. Optimal proportional method.

The optimal ratio when materials are combined. Permutation calculations. Replacement with the same volume, replacement with the same efficiency.

Effect increase and subtraction method. On the basis of the results of the formula test, adjust a certain performance, and increase or decrease the amount of relevant materials. The formulation of the formula is calculated using the same basic formula data, which is comparable, and the scheme with the best technical and economic indicators can be selected for demonstration, and the formula can be adjusted if necessary until it is qualified.