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UTILIZATION OF TOMATO PROCESSING WASTES
Author(s) -
KRAMER AMIHUD,
KWEE W. H.
Publication year - 1977
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1977.tb01254.x
Subject(s) - residue (chemistry) , acetone , flavor , chemistry , food science , moisture , pigment , valorisation , botany , waste management , biology , organic chemistry , engineering
Tomato cannery wastes, although high in moisture, contain a good proportion of protein (20–22%). An alkaloid, tomatine, was found in quantities up to 0.5% in leaves to practically nothing in the fully ripe tomatoes. The vines and stems had a protein content of 14–21% dry weight basis. A process for totally utilizing tomato cannery waste was developed where the waste was chopped, wet‐milled, alkalized and the presscake containing two‐thirds of the solids, 10% protein, could be used as cattle feed and one‐third of the solids, ≤60% protein, was precipitated by acidification as a tomato protein concentrate (TPC). The bulk of the protein (78%) is precipitated at pH 4.8,14% at pH 4.0, and 8% at 3.5 pH. The concentrate can be extracted with acetone to form ≤85% protein isolate plus a tomato flavor and pigment residue.