Views:17 Author:Site Editor Publish Time: 2004-05-26 Origin:Site
Abstract color lighter fragrance and flavor of honey as pure taste, not only popular in southern China and Southeast Asia, the majority of consumers, and because the color is consistent, large industrial applicability, its value is far greater than the dark-colored honey. To this end, we learn from ion exchange resin technology in the sugar industry's successful experience, raise the ion exchange technology for honey decolorization study the feasibility and exploratory testing.
Ion exchange resin and the close link between sweet taste, to be in the modern sugar industry in a very wide range of applications. In the sugar production process, using ion exchange, adsorption of colored material, can enhance the clean efficiency, but also reduce the sugar content of molasses Africa, to increase sugar recoveries. Sugar and beet sugar in improving the quality, but also increase sugar production, sugar industry was a win-win situation.
An ion exchange resin
Ion exchange resin is a spherical mesh of solid polymer copolymer, usually translucent or opaque, light yellow, yellow or brown. Do not dissolve in acid, alkali and water, but water swelling. To have, solvent, oxidant, reducing agent are stable, stable to heat. Resin molecules containing polar groups and some non-polar groups of two parts, expansion, the polar groups on the ion exchangeable ions in solution from the exchange, rather than the polar groups of the skeleton, compared with ion exchange resins . It has a switching capacity of high mechanical strength, swelling properties, the advantages of long-term use.
Classification of ion exchange resins, there are two. First, the physical structure by resin, ion exchange resins can be divided into the gel, large porosity, and carriers of three categories; second, brought under the resin exchange groups of different nature, which will be divided into cation exchange resin , anion exchange resins and other resins.
2 source of pigment and resin sugar decolorization principle
Sugar pigment mixture from different organisms. Part of the sugar cane pigments, flavonoids, phenols hard color. Enzymatic reaction can occur in certain phenolic or metal compounds (such as iron) to form colored compounds. Other types of pigments are precursors of sugar and colored material reaction products. For example, the type of melanin is the role of sugars and amino acids generated by the other pigment is produced by the degradation of sugar heated (eg, caramel). Some colored material is produced under alkaline conditions, such as degradation products of hexose. These organic compounds in alkaline media generally were anion, with two pro-nature, both hydrophilic and hydrophobic again.
Effect on principles of ion exchange resins have been accounts of the literature. Ion exchange reaction usually refers to the ion exchange resin and ion exchange reactions in solution. With the ion exchange resins with different physical and chemical structure of the ion system, or different, can occur decomposition of neutral salt, metathesis, acid-base neutralization reaction and salt formation reactions. When the ion exchange resin contact with the solution, it has many non-adsorption from the electrolyte solution, the adsorption capabilities.
Ion exchange decolorization including electrostatic and hydrophobic bonding. Syrup pigment mainly through two reaction mechanisms and strong base anion resin bond: one, the anion resin to form ionic bonds with the pigment anion exchange; Second, the non-polar part of the pigment and resin matrix in the two vinyl phenyl Group combination of hydrophobic forces (which can be interpreted as adsorption). If the use of R = N than on behalf of porous strong base anion exchange resin, molasses pigment to F that the syrup decolorization reaction of R ≡ NCL + F = R ≡ NF + LCL, of course, the adsorption of pigment does not show the chemical reaction (no qualitative change), only because the pigment of the R ≡ NCL is greater than the affinity of macroporous resin syrup in other media, which were firmly adsorbed to the resin of the hole and play a role in bleaching.
Three ion exchange resins for decolorizing the feasibility of honey
⑴ honey bees collected the nectar of plants or secretions, through full fermentation and storage of the sweet substance in the comb. Like sugar, like the pigment depends on its color, light-colored honey because of its light taste, and dark strong honey flavor heavy, so light-colored honey than the commercial value of dark honey. This is made of honey decolorization Qualitative Rules.
⑵ honey is a highly complex mixture of sugar, honey mature sugar content reached over 75% of the total, accounting for 95% dry matter 99%. The former is mainly honey honey, honey color and bees collected nectar plants are directly related. This is another pigment comes mainly from sugar and white sugar similar to the source plant. Either sugar or honey in the minerals (ash) content of sugar, color and quality are affecting one of the factors. A lot of literature and experimental research suggests that ion exchange resins for decolorizing purification has been successfully syrup, sugar and put into industrial production. This theory and practice in order to inspire us, will be ion exchange resins for decolorizing of honey is not only necessary but also feasible.
⑶ honey color is a measure of the quality of a sensory indicator, generally light-colored honey is better than dark-colored honey, which in the domestic and international markets have greater demand for favorable prices, which economic development, promoting western development construction to meet the increased needs of the people material life is important, the market demand is our research direction. Therefore, we must with a strong sense of responsibility and mission, an active part in ion exchange resins used for honey bleaching, purifying.
More than three full description of ion exchange resin for decolorization of honey, both seasonal move, but also all possible, it is imperative.
Ion exchange resins for decolorizing of honey is an innovative research. Thus, we engaged in this research, no prior experience to draw on, we need to develop and innovation. Current ion exchange technology, we still know little about theory, experiments and equipment are less developed, need to update the experimental technique has yet to be improved, we can only strengthen the theoretical study of ion exchange technology, repeated operation of experimental technology, good spirit and material to the preparation, threw himself into the study to only hope to succeed.
Ion exchange resins for decolorizing of honey is a systematic project, regardless of content from the study or the sense of it all should not be underestimated. Their wide-ranging, deep, involving chemistry, physics and other disciplines, we need to explore the long-running. The study includes different levels, recent research is mainly experimental, including the establishment of experimental methods, choose the appropriate resin, ion exchange resin decolorization find new and effective method of regeneration. Decolorization and then confirm to improve the color of honey, reduce the ash and other non-sugar impurities, without prejudice to the nutritional content of honey. While improving the quality of sugar, sugar solution can also be recovered from a variety of useful substances. Is also a deeper long-term research study, that the expansion of research outcomes into the amplification of the pilot phase, which is the first phase of research to expand the use of honey to the factory to the production of bleaching until mastery of the technology brought significant economic benefits.