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Testing biochemical compounds found in packaged fruit juices. (a) Testing of lactose by adding lactaid in milk; (b) testing fruit juice spoilage. GU: guaiacol; S: spoiled lemonade; C: control; F: fresh lemonade; Gl: glucose; M: milk; ML: milk + lactose; MΔL: milk + heated lactose. (Scale bar: 3 mm).
