PHARMACEUTICAL BOTANY 



VARIOUS KINDS OF CELL WALLS AND BEHAVIOR or EACH TO MICRO- 

 CHEMIC REAGENTS 



Nature of wall 



Where found 



Reagent and behavior toward same 



Cellulose. 



Lignocellulose 

 (Lignified wall). 



Reserve cellulose 



Mucilaginous 

 modification of 

 cellulose. 



Suberized walls. . 



Cutinized walls.. 



Callus of sieve 

 plates. 

 Silicified walls . . 



Parenchyme cells, tri- 

 chomes such as 

 cotton, etc. 



Wo o d y parts of 

 plants, such as stem 

 cells, bast fibers, 

 wood fibers, etc. 



Found in certain seeds 

 such as nux vomica, 

 ignatia, ivory nut, date 

 coffee, etc. 



In various parts of 

 plants. 



In cork, wounded 

 areas of plants, endo- 

 dermis. 



Forming outer walls 

 of many epidermal 

 cells. 



Plates of sieve tubes. 



Epidermis of Equi- 

 setacese, Gramineae, 

 etc.; Diatoms. 



Cuoxam dissolves it. Chlorzinc- 

 iodine solution imparts a blue or vio- 

 let color. Iodine solution followed 

 by sulphuric acid colors it blue. 



Phloroglucin with HC1 imparts a red 

 color except to bast fibers of flax. 

 Corallin-soda solution imparts pink 

 color. Aniline sulphate with H2SO4 

 colors it a golden-yellow. Chlorzinc- 

 iodine imparts a yellow color. 



As for cellulose. 



Alcoholic or glycerin solution of meth- 

 ylene-blue imparts a blue color. 



Alcoholic extract of chlorophyll, in the 

 dark, imparts a green color. Alcannin 

 and Sudan III impart a red colora- 

 tion. Converted into yellowish drop- 

 lets and granular masses upon heat- 

 ing with a strong solution of KOH. 

 Sulpuhric acid is resisted. 



As for suberized walls. 



Corallin-soda solution imparts pink 



color. 



Soluble in hydrofluoric acid. 



