Povidone K17/K25/K15/K30/K90/K60,N-Vinyl-2-Pyrrolidone,Povidone Iodine,Crospovidone

AdBlue  DEF is a consumable that must be used in SCR technology.

In recent years, with the restrictions of laws and regulations on environmental protection and people’s attach importance to health, water-dispersible polyisocyanates have received more and more attention. They are mainly used as cross-linking components for the preparation of water-dilutable two-component polyurethanes, or used as an additive in aqueous dispersion adhesives and crosslink aqueous dispersions in textile finishing or formaldehyde-free textile printing inks.

TRIS(Tris(Hydroxymethyl)Aminomethane), Bis-Tris, Tricine, TES, TAPS are buffers commonly used in biochemical experiments and molecular biology experiments, and they all contain the structure of TRIS. Then what are the differences in application between these buffers?

In biochemical experiments, buffer solution plays an indispensable role, it can resist the influence of a small amount of strong acid and alkali and maintain the pH value closest to the physiological environment for the system. HEPES (4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid) buffer and PIPES buffer are both commonly used in biological experiments, both of which are Good's buffers and have similar structures. Many people often have doubts: Besides the structure, what is the difference between them?

The Good's Buffer is a series of N-substituted sulfamic acids that have good pH stability and are inert to a variety of chemicals and enzymes. 3-(N-morpholino)propanesulfonic acid, referred to as MOPS, is one of Good's Buffer, it plays a very important role in the biological experiments.

Hormones are molecules produced and secreted by endocrine glands in the body. They are released into the blood and travel to other parts of the body where they bring about specific responses from specific cells. Steroid hormones are derived from cholesterol and are lipid-soluble molecules. Examples of steroid hormones include the sex hormones (androgens, estrogens, and progesterone) produced by male and female gonads and hormones of the adrenal glands (aldosterone, cortisol, and androgens).

Guanidine hydrochloride, which is often used as an intermediate in medicines, pesticides, dyes and other organic compounds, is an important raw material for sulfonamides and folic acid; it can be used as a strong denaturants in the extraction of total RNA from cells, and used for denaturation and complexation of proteins. It can be used as an antistatic agent for synthetic fibers. In addition, it can also be used as a reducing agent to prepare graphene.

As a common bio-buffer, Tris(hydroxymethyl)aminomethane (TRIS) is not only widely used as a nucleic acid and protein solvent, one of the main components of protein electrophoresis buffer, but also can produce a variety of chemicals, pesticides, medical products, it is also an important intermediate for the preparation of surfactants, vulcanization accelerators and some drugs. Besides above functions, TRIS can also be used to prepare composite phase change materials.

4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid, abbreviated as HEPES, is a Good's buffer with pH buffer range of 6.8~8.2. HEPES is widely used in cell culture, because it is better at maintaining physiological pH despite changes in carbon dioxide concentration when compared to bicarbonate buffers, which are also widely used in cell culture. Then how to prepare HEPES and it buffer?

The market requires lower and lower carbon/sulfur content in steel, for low carbon sulfur steel like silicon steel, extra-deep drawing auto sheet, and gas pipeline steel, during the refining process, carbon sulfur content in steel sample reaches to around 0.001%. Since when the content is closed to baseline value, the baseline value will affect testing limit, also affect analyzing precision and accuracy. Therefore, it is necessary to decrease baseline value, and carbon sulfur crucible pretreatment is an important way.