Search results
Results from the WOW.Com Content Network
Good sought to identify buffering compounds which met several criteria likely to be of value in biological research. p K a : Because most biological reactions take place near-neutral pH between 6 and 8, ideal buffers would have p K a values in this region to provide maximum buffering capacity there.
Buffer capacity falls to 33% of the maximum value at pH = pK a ± 1, to 10% at pH = pK a ± 1.5 and to 1% at pH = pK a ± 2. For this reason the most useful range is approximately p K a ± 1. When choosing a buffer for use at a specific pH, it should have a p K a value as close as possible to that pH.
Acid-neutralizing capacity or ANC in short is a measure for the overall buffering capacity against acidification of a solution, e.g. surface water or soil water.. ANC is defined as the difference between cations of strong bases and anions of strong acids (see below), or dynamically as the amount of acid needed to change the pH value from the sample's value to a chosen different value. [1]
This page was last edited on 11 December 2024, at 08:10 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Borate buffered saline (abbreviated BBS) is a buffer used in some biochemical techniques to maintain the pH within a relatively narrow range. Borate buffers have an alkaline buffering capacity in the 8–10 range. Boric acid has a pK a of 9.14 at 25 °C.
Tetrasodium pyrophosphate is used as a buffering agent, an emulsifier, a dispersing agent, and a thickening agent, and is often used as a food additive. Common foods containing tetrasodium pyrophosphate include chicken nuggets , marshmallows , pudding , crab meat, imitation crab , canned tuna , and soy -based meat alternatives and cat foods and ...
MES is used as a buffering agent in biology and biochemistry. It has pK a value of 6.15 at 20 °C. The pH (and pK a at ionic strength I≠0) of the buffer solution changes with concentration and temperature, and this effect may be predicted using online calculators. [2] MES is highly soluble in water. The melting point is approx. 300 °C.
In cured meats, it speeds the conversion of sodium nitrite to nitrite (NO − 2) by forming the nitrous acid (HONO) intermediate, [clarification needed] and can improve water-holding capacity. Disodium pyrophosphate is also found in frozen hash browns and other potato products, where it is used to keep the color of the potatoes from darkening. [4]