When temperature, pH and several other factors affect the rapid growth of microorganisms in the product, water activity can be said to be an important factor in controlling deterioration and determining the storage period. By measuring water activity, it is possible to predict which microorganisms will or will not be a potential deterioration factor. The general trend is that the smaller the water activity, the more stable the food and the less the deterioration. In addition to affecting microbial growth, water activity also determines the activity of enzymes and vitamin C in food, and plays a decisive role in its taste, aroma and color. 1. Replace the solids with water containing raw materials to add moisture: For example, the formula requires 100 grams of sugar, 20 grams of water, can be replaced with 70 grams of syrup plus 50 grams of sugar. The total amount and the required softness will not change 2. Adding raw materials with strong binding to water molecules, adding raw materials with strong binding to water molecules For example, adding sorbitol, glycerin, trehalose, functional polysaccharides, and the like. However, adding the water condition and stability of the substance to be combined, the excessive addition of sorbitol may be counterproductive, which will destroy the stability of the substance and lead to an increase in water activity. 3. Process improvement: In practice, the agitation and emulsification aeration process is a very important factor in determining water activity. In this process, materials need to be dissolved, integrated, and combined. Many companies have different on-site management and mechanical equipment, which will lead to different effects of the same formula. 4, material drying technology : Hot air drying; vacuum drying; spray drying; freeze drying; Summary: In our practice, the choice of raw materials is a common means, and at the same time, it will be overly dependent on certain raw materials. In fact, all water activity is reduced and should be based on the control of the moisture content of the product, rather than being formulated at the outset. Our formula research and development is generally based on the research and development of the taste and shape of the product. This is the core. With this foundation, it is supplemented by control means to meet the requirements of the fresh-keeping period. Otherwise, it will cause too much unnecessary raw material to be added at the beginning, which affects the product itself. For example, glycerin, thickeners, should be added later, not at the beginning. If the water activity is suitable, these can be added. ★ Prepare saturated NaCl solution: Take a weighing bottle and add an appropriate amount of distilled water. Weigh a certain amount of NaCl with a balance and place it in a weighing bottle. Stir well and saturate the reagents. Stand at room temperature ★ Calibration method:: 1 Remove the GYW Moisture Meter from the box and install and connect the printer and measurement sensor. Turn on the power switch. 2 Take a clean sample dish and put in the prepared saturated NaCl solution. Put into the measuring chamber of the instrument and close the measuring sensor cover 3Press the Nacl button on the instrument screen, click the measurement time button, set the time according to the sample requirements. 4 Calibration starts, after the measurement is over. The instrument automatically alarms and the red light in the upper left corner lights up. Record the calibration value. Remove the sample dish. ★Measurement steps: 5Press the single channel button to enter the test page 6 The sample to be tested is subjected to treatment and pulverization. Take a clean sample dish and place the sample to be tested. Place the sample dish into the chamber and close the measuring sensor cover 7 Press the measurement time button to set the time according to the sample requirements. 8 Measurement starts recording the value. At this point, you can click on the curve button to observe the measurement curve in real time. 9 The instrument ends with an automatic alarm and the red light in the upper left corner lights up. Press the Print button to print and record the results
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Herbal Extracts,Ginseng Extract,Olive Leaf Extract,Echinacea Extract Xi'an Healthway Biotech Co.,Ltd , https://www.xianhealthway.com The Guanya Moisture Analyzer briefly introduces several methods for reducing water activity:
How to operate the water activity meter to detect water activity?
How to operate the crown water activity detector