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Figure 1. Batch solid-liquid extraction (leaching). A, Incoming pure solvent; A, outgoing solvent rich in solute (B); B, solute leached from solid (C); C, original solid rich in solute (B); C, extracted solid depleted of solute with retained solvent (A); t, extraction time.

Figure 1. Batch solid-liquid extraction (leaching). A, Incoming pure solvent; A, outgoing solvent rich in solute (B); B, solute leached from solid (C); C, original solid rich in solute (B); C, extracted solid depleted of solute with retained solvent (A); t, extraction time.

A process whereby components of a food material are concurrently extracted while being made soluble by microbial and chemical action complicates leaching. A good example of this type of process is the batch hydrolysis of minced fish flesh processing waste by enzyme action. The water-insoluble components are changed into soluble (digested) materials. The resultant water-based protein solution can be dried to produce a high-quality protein product for both animal and human consumption. This technique is a good means for using the tremendous amounts of unused industrial fish, by-catch, underutilized edible species, and waste from processing whole fish (4).

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