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Acidity regulator, or the PH value of the control agent, used to adjust or maintain the PH (acid or base) of a food additive. Acidity regulator may be organic or inorganic acid, alkali, neutralizing agent or buffer. Acidity regulator identified by E codes, such as E260 (acetic acid), or listed in the “food acidity agent” under. Frequently used is the acidity regulator citric acid, acetic acid and lactic acid. Sodium carbonate, potassium carbonate can be used in flour products, hydrochloric acid, sodium hydroxide are strong acid, strong alkaline substances, is corrosive to the human body can only be used as processing aids to complete the processing before the food to be neutralized. 

Acidity regulator also known as pH regulator, is used to maintain or change the pH of the substance of food acidity regulator
. It is mainly used to control all of the required food acidifier, alkali and salts have a buffer. Acidifier to enhance the quality of food has many features, such as changing the acidity of foods and maintain and improve its flavor; enhance antioxidant, to prevent food spoilage; and heavy metal ion complexation, to prevent oxidation or browning reaction with stable color, reduce the turbidity, enhanced gelling properties and so on. Acidifier are – given anti-microbial effect, although a separate acid to antibacterial, antiseptic required too much concentration, sensory characteristics of food, hard practice, but when in sufficient concentration, the choice of some other preserved acidifier methods such as refrigeration, heating and use, can effectively extend the shelf life of food. As for the choice of different acids, depending on the nature and cost of acid. Sour with a pH value of stimulation threshold to said inorganic acid acidity threshold of about 3.4 to 3.5, organic acids, sour threshold between 3.7 to 4.9. PH value of most food value in between 5 to 6.5, although the acid, but no sour feelings, if the pH value of 3.0 below the sour feeling strong, difficult to taste. Acidity regulator of its food requirements by the effective application of the main characteristics of control, usually in the role of organic acids and salt with the main buffer. Also, because many organic acids are normal constituents of food, or participation in the body’s normal metabolism, and therefore safe and widely used. Licensing of approved varieties of acidity regulator. However, with foreign license to use, compared to similar species there is a certain gap. Variety of organic acids is mainly the lack of salt. However, the important thing is to strengthen the current application development, should make full use of existing varieties, for different food materials, developed with their different characteristics of the popular flavor of food.

Chinese name: English name frother: frothing agent; frother definition: for a bubble, to maintain the stability of flotation foam. Respective disciplines: Coal Science and Technology (one subject); coal processing and utilization (two subjects); Coal (three subjects)

Basic Introduction
English name: petroleum resin petroleum resin petroleum cracking by-product of C5, C9 fraction, by pre-treatment, polymerization and distillation process the production of a thermoplastic resin, it is not a polymer, but the molecular weight range of 300-3000 oligomers.
Source
Petroleum resin oil derivatives by named sources, it has low acidity, good compatibility, water resistance, alcohol and chemical resistance and other characteristics of chemically stable pH, and adjust the viscosity and thermal stability characteristics. Petroleum resin is generally not used alone, but as promoters, regulators, modifiers and other resins used together.
Categories
Petroleum resin is generally classified as C5 alphatic (aliphatic type), C9 aromatic (aromatic hydrocarbons), DCPD (Central fat diene, cycloaliphatic) and pure monomer (eg poly SM, AMS (alpha methyl styrene) and other products) other four types, which are all composed of molecules of hydrocarbons, it is also known hydrocarbon resin (hydrocarbon resins, HCR). Petroleum resin according to different raw materials are divided into aliphatic resin (C5), alicyclic resin (DCPD), aromatic resin (C9), aliphatic / aromatic copolymer resin (C5/C9) and hydrogenated petroleum resin. C5 hydrogenation petroleum resin, C9 petroleum resin hydrogenation
Advantages
Petroleum resin is a new development in recent years, chemical products, due to a low price, good compatibility, low melting point, water resistance, and chemicals such as ethanol can be widely used in rubber, adhesives, paint, paper, ink other industries and fields.
Structure
Petroleum resin model of chemical elements: petroleum resin C9 Hydrocarbon Resin is the most widely used and C5 petroleum resin. C5 petroleum resin, C5 petroleum resin for its peel adhesive strength, rapid viscosity, adhesive properties of stable, moderate melt viscosity, good heat resistance, compatibility with the polymer matrix is good, and the price is low, began to gradually replace the natural resin tackifier (rosin and terpene resin). Refined C5 petroleum resin in hot melt adhesive characteristics: mobility, and can improve the wettability of the main material, viscous, and has outstanding tack performance. Good aging resistance, light color, transparency, low odor, low volatile matter. In the hot melt adhesive, can be used alone as a ZC-1288D Series tackifying resin can also be mixed with other tackifying resins used to improve certain properties of hot melt adhesive.