These results, which indicate that guarana-tannic acid may be 
identical with chlorogenic acid, were not confirmed either by formation 
of the acetyl derivative or the aniline salt; both preparations had 
quite different melting points from those given by Gorter. This leads 
us to the view that the tannic acid from guarana is not identical with 
chlorogenic acid, but that it is as an independent guarana-tannic 
acid ; and in no case can this acid be considered to be catechin, as 
can be seen from the following table of melting points: — 
Acetyl derivative 
Aniline all 
Guarana tannic acid . 
M.P. 1 99-201° 
M.P. 147-149° 
M.P. 203-205’ 
Chlorogenic acid. 
M.P. 206-207° 
M.P. 180-181° 
M.P. 174° 
Catechin . 
M.P. 175-177° 
M.P. 124-125° 
Not known 
Perkin’s & Yoshitaka’s 
higher-melting Catechin .... 
M.P. 235-237° 
Not known 
Not known 
Acacia Catechin . 
-_ 
M.P. 204-205° 
M.P. 158-160° 
Not known 
further investigations of both the /3-guarmine and the guarana- 
tannic acid are wanted, before a definite opinion with regard to the 
constitution of these two compounds can be formed ; however , in M 
case can the opinion he maintained that the chief constituents of Mi 
plant are theine and catechin. 
Annals of Tropical Med 
'■ F ° r an a d p U aCC T‘ ° r G “ m ™ P - »■ 
and Parasitology, Vol. IV, No. i, p . IO -. 
2 ‘ MARTIUS - Anna, enderChemie, Vol. XXXVI, p. 03. 
o- Berthemot u. Dechatet as t , 
D . CH a TEL as. Jour. d. Pharm., Vol. XXVI, p. 514. 
^'’■903 D p.«r t °' f ' n ' V ° 1 ' I ' P ' ,49 ' see Rl 90 Peckolt, Be,. d. deutseb.p 
1 . GmtITk” a : T '" ,d r>ekker ’ 1 '• Dc Lo ” is,off “. v °>- n. p. >33. 
7 . Gorter' k ’ aT ^ ** * 3 * 7 ,- Vo,. 359. P- 
Gor.er, k. , Arcblv da Ph armacie . Vo , „ 
• M. u„d Webster t A . „ 
9 . Nibrenstrin M., Darrtdl l '' Bn ""' P' 337. ,909. Frankfurt a. 
der biMh "»«ch.„ ArJlsLI'todet b 7 . II. 
