White sugar according to normal theory, if the preservation of good words can be saved for ten years, but generally in the enterprise labeling shelf life will be marked one to two years of shelf life.

Because sugar after a long time will have mites and microbial overload, so stored for a long time, it is best to be used for stir-fry use, so you can high temperature treatment, the effect will be better.

White sugar is refined sugar made from molasses extracted from sugar cane and sugar beets. White sugar is white in color, clean and sweet. White sugar is easily contaminated with pathogenic microorganisms during production, packaging, transportation and storage. In particular, white sugar that has been stored for more than a year and has turned yellow in color is often contaminated by mites.

Sugar is a nutrient, but should be controlled within a certain amount. In the end a person a day to eat how much white sugar is appropriate, the more consistent opinion abroad is: daily per kilogram of body weight control in about 0.5 grams. That is to say, weighing 20 kilograms of children not more than 10 grams per day, weighing 60 kilograms of adults, about 30 grams per day.

White sugar purchase

1, color. Observe the color of sugar, the sample should be sprinkled into a thin layer on white paper, and then observe. Good white sugar color white and bright, shiny; second-quality white sugar white slightly light yellow; poor white sugar yellow, luminosity dark, no luster.

2, organizational status. Sensory identification of white sugar tissue state, the sample should be spread on a thin layer of white paper, first observe the shape of its grain, the presence of agglomeration, moisture absorption and impurities, and then formulated into a 20% aqueous solution of sugar, to observe the presence of precipitation and impurities.

3, odor. Sugar samples can be taken directly to smell its odor, or take a little in the research bowl, crushed after smell its odor. Good quality white sugar has the normal odor of sugar; second-quality white sugar has a slight molasses flavor; poor quality white sugar has a sour taste, wine taste or other foreign smell.

4, taste. Check the taste of white sugar, take a small sample of direct tasting, and then formulated into a 10% sugar water solution to try.