One. Why can honey add tea blacken
Honey add tea blackens, because be produced in honey,be, treatment, carry, store in the process, use iron makes appliance get of acidity honey corrode, iron makes the iron ion in appliance dissolve in entering honey. If these iron ion assume diatomic position, the tea in encountering tea is much more phenolic, can produce complexing reaction, produce blue black to precipitate. Especially the sensitivity that much more phenolic complexing reflects diatomic iron ion and tea is very tall, ion of 1 milligram diatomic iron should be contained only in every kilogram solution, join reagent of tea much phenol, naked eye can observe solution blackens phenomenon. But, if be the iron ion of complexing condition, won't happen blacken phenomenon. The iron in honey, have complexing state already, also have diatomic and ionic state. Become angry with honey of boiled water add, can explain to there is diatomic iron ion to exist in honey only.
2. Add tea blackens honey is harmful human body is healthy
The person that expend for offset is responsible, supervisory bureau of Shanghai quality technology is opposite in time the honey product that sells on the market undertakes special supervise selective examination, according to national honey sanitation the standard asks to undertake examining, decide result: In the product of 19 kinds of honey that selective examination, the content of heavy metal lead and zinc is far the index under the regulation in national level. Among them, highest value is less than lead 0.1 milligram / kilogram (the standard is <=7 milligram / kilogram) , highest value is less than zinc 4 milligram / kilogram (the standard is <=25 milligram / kilogram) the content country of the iron in; honey sets without set limit to, via examining, the iron content in 19 kinds of honey is in mostly 1- - 10 milligram / inside kilogram limits, the quantity that contain iron is very low, nonexistent what pollutes a problem.
Well-known, although the quantity containing iron inside human body is very few (adult 3- - 5 grams) , but very important however, it is one of microelement with indispensible human body, it is haemoglobin, muscle red protein and cellular pigment and other breath are enzymatic kind (cellular pigment oxidation is enzymatic, oxidize too hydrogen is enzymatic, cross oxide enzymatic) indispensible series part, its are main physiology function is the carriage that participates in oxygen with the form of haemoglobin and the form with cellular pigment participate in constituent breath, drive physiology to oxidize reductive process. Those who be like iron absorb inadequacy, can be in human body especially infant, pregnant woman, anemia of the sex that be short of iron is caused in wet nurse, this is the nutrient problem that the whole world exists generally. According to World Health Organization (WHO) statistic, be short of iron sex incidence of a disease, grown man is made an appointment with 10% , grown woman is made an appointment with 20% , children is 50% , it is the global disease of health of a kind of minatory mankind, our country is not exceptional also, be short of iron to divide outside causing anemia, still can cause nerve, digest, the constituent organ function such as muscle and immunity is damaged. The absorptivity that causing the account that lacks iron basically is iron is low, the absorptivity after normal person absorbs iron is 5- - 10% , because the iron inside body is insufficient,be short of patient of iron sex anaemia, absorptivity can lift 20- - 30% . The form that iron exists in food basically has two kinds: One kind is ionic iron, the iron of this kind of form must fall in the action of hydrochloric acid in gastric juice, reductive into the ability after diatomic iron is ionic; be absorptioned by human body is iron of blood red element another kind is the form with Bu Lin iron direct by alvine mucous membrane epithelial place is absorbed. The iron in honey basically is diatomic iron.
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