Propolis quality directly affects its effect after eating. Therefore, consumers should understand the corresponding quality standards when selecting different types of propolis. At present, there are mainly the following types of propolis available for sale. Hair glue: directly obtained from the beehive without processing, containing honeybee limbs, sawdust, sediment, linen fibers and other impurities, its form is opaque lump or debris, suitable for external use or as a feed for chickens, pigs, cattle and sheep Agent. Original glue: After industrialized training of wool, the content of impurities and heavy metals conforms to international standards. The shape is irregular and suitable for raw materials for food, medicine and cosmetics. Propolis standard solution: propolis ethanol solution, suitable for external use or as food, pharmaceutical additives and preservatives. Propolis water solution: suitable for oral administration after dilution, or as food and drug additives. Propolis oil: A propolis oil solution that can be used as a raw material for beauty products or daily skin care. Propolis dry cream: propolis extract, film-like, can be used as food, medicine, cosmetics additives, and can be used in industry, agriculture, animal husbandry, aquaculture. Stuffed gum products: all kinds of foods, medicines and cosmetics containing propolis. The quality standards of the propolis need to detect the quality of propolis is mainly refers to hair glue, because it is the raw material of other types of propolis or products. The main identification is threefold: one is freshness, the requirement is fresh propolis collected in the year, rich smell and fragrance; second, impurity content is lower than 5%; third is the effective substance content, ie, the higher the ethanol soluble content, the higher the grade. , less than 55% are foreign products. China's propolis quality standard stipulates that propolis contains more than 75% of its soluble content of ethanol as a superior product and more than 65% of its first-grade product. More than 55% are qualified products. The standard also stipulates that it is not allowed to heat natural propolis and artificially add other substances. Its sensory indexes are as follows: Shape: It is an opaque solid clump or scum. Color: brown, brown, blue, green, brown or gray-brown. Odor: Aroma of resin (mixed with honey, vanilla, conifer or poplar). Structure: dense, broken section is not neat. Hardness: Viscosity at 20°C to 40°C, Hard at temperatures below 20°C. The propolis test method is mainly used to identify the quality of the propolis from the appearance and material properties. Shape: The propolis is opaque, solid, with a smooth or rough surface. The fracture surface is sand-like. There is no bee corpse, disdain and other sundries. Color: yellowish-brown or gray-brown, sometimes with blue, a few close to black, shiny. Fragrance: The special aromatic odor of resin that is emitted when the propolis burns. Taste slightly bitter with the tongue, the aroma is more concentrated and better. Viscosity: Propolis is sticky and can be softened by hand. It is soft at 36°C and has the strongest stickiness. It becomes hard and brittle at 15°C and melts and separates beeswax from 60°C to 70°C. The greater the stickiness, the better the quality. Specific gravity: The specific weight of the bee is about 1.127, the specific gravity is low, and the beeswax content is high. Purity: Propolis is dissolved in ethanol at 95°C and it is a transparent chestnut solution. It has only a granular precipitate and cannot have any other substance. In addition, propolis can be graded based on the ethanol extract content. China Agricultural Network Editor
Long-Chain Acid Methyl Ester Series
Long-Chain Acid Methyl Ester Series,Eicosanoic Acid,Methyl Ester,Cas1731-92-6 Heptadecanoic Acid
Nanjing Chemlin Chemical Industry Co.,Ltd. , http://www.parachemlin.com