Group frequencies acids

Part—IV has been entirely devoted to various Optical Methods that find their legitimate recognition in the arsenal of pharmaceutical analytical techniques and have been spread over nine chapters. Refractometry (Chapter 18) deals with refractive index, refractivity, critical micelle concentration (CMC) of various important substances. Polarimetry (Chapter 19) describes optical rotation and specific optical rotation of important pharmaceutical substances. Nephelometry and turbidimetry (Chapter 20) have been treated with sufficient detail with typical examples of chloroetracyclin, sulphate and phosphate ions. Ultraviolet and absorption spectrophotometry (Chapter 21) have been discussed with adequate depth and with regard to various vital theoretical considerations, single-beam and double-beam spectrophotometers besides typical examples amoxycillin trihydrate, folic acid, glyceryl trinitrate tablets and stilbosterol. Infrared spectrophotometry (IR) (Chapter 22) essentially deals with a brief introduction of group-frequency... 

Table 4.10 OH and Related C—O Group Frequencies for Alcohols and Carboxylic Acids...

Table 9.1. Important Group Frequencies, in cm of Amino Acids and Their Hydrochlorides (Rao, 1963)...

Charged group frequency (CHF) is defined as the proportion of amino acid residues that are charged at about pH 6. It is thus equal to the number of aspartic acid, glutamic acid, histidine, lysine, and arginine residues divided by the total number of residues in the molecule (Bigelow 1967). 

---