. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 656 Contribution from the Hureau of Chemistry CARL L. ALSBERG, Chief. J^^^J-U Washington, D. C. May 8, 1918 CONCORD GRAPE JUICE: MANUFACTURE AND CHEMICAL COMPOSITION. By B. G. Hartmann, Fermentation Chemist, and L. M. Tolman, Chief, Central Food and Drug Inspection CONTENTS. Scope of the investigation 1 Character of fruit used 2 Manufacture of commercial Concord grape juice 4 Crushing and stemming the fruit 6 Heating the crushed fruit 6 Pressing the heated fruit 9 Sterilizing the juice and bottl
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 656 Contribution from the Hureau of Chemistry CARL L. ALSBERG, Chief. J^^^J-U Washington, D. C. May 8, 1918 CONCORD GRAPE JUICE: MANUFACTURE AND CHEMICAL COMPOSITION. By B. G. Hartmann, Fermentation Chemist, and L. M. Tolman, Chief, Central Food and Drug Inspection CONTENTS. Scope of the investigation 1 Character of fruit used 2 Manufacture of commercial Concord grape juice 4 Crushing and stemming the fruit 6 Heating the crushed fruit 6 Pressing the heated fruit 9 Sterilizing the juice and bottling it for storage 12 Siphoning the juice 13 Bottling and pasteurizing the trade juice. 17 Page. Manufacture of commercial Concord grape juice—Continued. Manufacture of grape juice in the Lake Erie district 17 Occurrence of small amounts of 18 Introduction of water during manufac- ture 19 Chemical composition of grape juice 20 Methods of analysis 25 Additional determinations 25 Summary 26 SCOPE OF THE INVESTIGATION. Although a large amount of work has been done on the chemical composition of American grapes, and several bulletins on the subject have been issued in the last few years by the Department of Agricul- ture, the information presented is restricted principally to the acid and sugar content of American grapes, and, in the main, is of interest to viticulturists only. The literature appears to contain no specific information concerning the manufacture and chemical composition of commercial Concord grape juice. The purpose of the investiga- tion, the results of which are embodied in this bulletin, was to obtain information on the manufacture of Concord grape juice and to pro- cure chemical data on authentic samples of this product. The first step of the work consisted in taking, under the super- vision of a member of the Bureau of Chemistry, 5-gallon samples 1 It is desired to express appreciation, for their cooperation, to Mr. B. , who was in charge of
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