CHEMICAL I'.ASIS OF TI1K AMMAI. |HH>Y. 11 



'I'm: CIIKMISTKY IK nn: SIYIKAL l'i:i King. 1 



LM I .V-////V 

 Egg-albumin 



A- obtained in tin- solid form by evaporating its solutio: 

 dryue-s at 40 J , preferably in vacuo.it forms a semi-transparent, 



brittle mass, of a pale yellow culour L tasteless aiisl inodorous. l)i^- 

 snlviMl in wa_ter it yields a clear neutral colourk'ss solution. This 

 solut: Mali's on heating, but the temperature at which tin- 



coagulation takes place varies considerably with the coiiccntrati' >i i , 

 and is largely dependent upon the presence ,,\ absence <>i' salts. 

 The moiv commonly observed inn) erat lire is 7<l-7.", , but C.antfer 

 --that coa-jula may also be obtained at .14 and i.". . The 

 more dilute the solution is, the higher is the temperature at which 

 it coagulates, thus linallv resembliii"; a solution of allmiuni from 

 \vhieh the salts ha\e been removed by dialysis. ;; \\'lien luv- 

 ei])itaj.ed from solution by excess of alcohol it is ivadilv eoaiMi- 

 lated by tin- procipitajjt, so that it is now usually insoluble in 

 water. In this resjieet it di tiers somewhat rharaeteristieally from 

 senim-albumin, which is not so immediately, though it is ulti- 

 mately, coagulated by the action of alcohol. 



tn (',, \-\\\ and Berard, 4 bv applying tin- iiii'tlmil ..t 

 heat-OOagolation to filtered \\hitr c.f <"^'^, cua^ula inav In- <!- 

 tain.-.l at .".:... i',7 . 7'J . 71 . and SL' . tli. ; lirM tu,, 1.,-in- du.- t.. 

 ^1'ilniliiis. thi- itlifi-< t albumin-. 



Strong aci(ls especially nitric acid, cause a coagulation similar 

 to tTiat produced bv lu-at or by tlie i>roloiit:ed action of alcohol: 

 Fh"e idlrujjlill becjj|ues JtrofoUlldly cjiaiiL[e_d bv the action of the 

 ;u^id, and doi-s n.,i di--olvc UJMUI romoval of the acid M-'i 

 uric chloride, nitrate ..)' sihcr. ami lead acetate, precipitate the 

 albumin, forming with it insoluble .oiupuiinds of variable com- 

 :on. 



: acid in excess oivev no pi.-, ipn.it. . luit when the 

 solution i- concentrated the albumin is transformed into a ti.m- 

 parent jelly. A similar jelly is produced when strong caii-tn- 

 :i i- added to a eom-i-iit rated solution of r^'-albumiu. In 



1 In :iil<litiini tc. tin- (.rk< aln-:ily .|ii..trd ...n-iilt 11. il.-trin. //./'. 7. ./ 

 IM. in .--!: I (I. fc-r all il:it:i ronr.Tiiin^ I In- |.r 



- < '/i i mil ni>/>liii>ti--i it Ai / ' I Miicean. 



:,.|i| S-.. .\i.,t HI Mmly'ii Ja*TM- 

 l*rirl,t. \i. (I--I I. S T. 



- Upta him / IM ' ^^M 1871 .luli-IIH 



' ' ' / I M8), p. 170 



