
J¥, BULLETIN No. 632 £3) 
Contribution from the Bureau of Plant Industry 
WM. A. TAYLOR, Chief 

‘Washington, D.C. PROFESSIONAL PAPER November 30, 1917 
THE UTILIZATION OF WASTE TOMATO SEEDS 
| AND SKINS. 
| By FRANK RABAK, Chemical Biologist, Drug-Plant and Poisonous-Plant Investi- 
| gations, Bureau of Plant Industry. 
\a 
CONTENTS. 
Page. Page. 
MEMETOCUCTIONs \e ccc aiccic se orcite pes eiefeiees we i-islo2 1 | Extraction of tomato-seed oil—Continued. 
| Commercial products from tomato refuse... . 1 Chemical examination of the oil......-..- 7 
| Accumulation and disposal of tomato waste. - 3 Availabie quantity of the oil............ 9 
Percentages of seeds and skins.......-... 3 Uses and value of the oil...............- 10 
Drying the waste material and separat- Momato-seedemedl eee ss wsees Se mele orcie ctayetetere 11 
HMPeUNGESCC US) fos sek ae eek ee a Ne 5 Utilization for stock feeding............- 11 
| Extraction of tomato-seed oil....-........--. 5 Available quantity of the meal.......... 12 
Physical and chemical properties of the SUTIN aye ae ra Ae og certian 12 
crude and the refined oil:........--..- fe a|jpeluiterature cited eet casacs stucco eee ene ee = oy 14 
INTRODUCTION. 


_ The manufacture of tomato products in the United States con- 
{stitutes an industry of large and growing proportions and impor- 
tance. Tomatoes serve as the basis for two general classes of prod- 
ucts, in one of which the fresh whole tomatoes are used and in the 
| other the pulp alone, as in the manufacture of catsups and soups. 
|For this latter class large quantities of tomatoes are required, from 
which the seeds and skins at present are discarded as useless. 
__ The increased interest in the production of foodstuffs throughout 
‘the country will doubtless result in an extension of all canning and 
packing operations, including tomato products. In the following 
pages attention is directed to the possible utilization of the waste 
‘tomato material, not only from the standpoint of food conservation, 
‘Pat as a profitable adjunct to the tomato-canning industry. 

COMMERCIAL PRODUCTS FROM TOMATO REFUSE. 
By proper treatment, tomato refuse may be made to produce 
| two important products, namely, fixed oil and meal, both of which 
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