Honey is an excellent food and health care products2010-12-30 at 03:44 am hugege
Honey is an excellent food and health care products. However, there are a wide variety of honey on the market for consumers, there is no certain knowledge, it is difficult to distinguish the authenticity of honey, advantages and disadvantages. I identify here are some tips for the quality of honey.
First of all, from the appearance observation, pure quality fresh honey is sticky, transparent or translucent gelatinous liquid, sweet, with a relatively strong smell of flowers. When the ambient temperature is below 10 ℃, or the honey place for too long, easy to form solid crystals. Because honey bee species vary greatly in different colors, from water white (almost colorless) to dark (dark brown). Light colored honey is often the species, its taste and smell better. Therefore, the color of honey, both can be used as a basis for classification of honey can also be used as one of the indicators to measure the quality of honey.
Secondly, the investigation of foreign honey. Foreign body easily lead to deterioration of honey, or send an alcohol odor, sour. Here are several simple ways to test out the impurities in honey:
Adulteration test: Apply a small amount of honey in a test tube, dissolved with distilled water, after standing observation, if the precipitation, then mixed with impurities.
Mixed with starch test: If honey mixed with starch, mix, appearance looks poor transparency. Can also take a little honey-like, by adding 5 times distilled water, boiling, cooling, add 1 to 2 drops of iodine solution, a starch is illustrated in blue.
Mixed with alum test: barium chloride solution can be tested in a test tube by adding honey, diluted with an equal amount of distilled water shaking, and then drip a few drops of 20% BaCl2 solution, if a white precipitate, then there is alum incorporation.
Honey is the test of heavy metal pollution: a cup of tea available, into the amount of honey, stir with chopsticks, such as the color of tea remain the same, prove that honey is not contaminated; if the tea into a gray, proved to be contaminated, the deeper the color, pollution heavier.
Mixed with caramel, glucose test: the two high sugar concentration, viscosity, the fluid does not like honey, unlike crystalline honey, mixed with such sugar honey, stirring with chopsticks, the larger the resistance.
Mixed with ammonium salt of the test: Take a test tube by adding 2g of honey, diluted with an equal amount of distilled water, then add 10% sodium hydroxide solution 2ml, shake, immediately placed on a wet pH test strip in a test tube, if the test strip change blue, indicating that the mixed ammonium salt.
Dextrin or rice mixed with the test: The foreign matter mixed with honey, fermented mildew easily, the rancid smell and taste rancid.