3. Results and discussion
3.1. Characteristics of green and brown juices
Table 2 compares the characteristics of green and brown juices.
Green juice was a relatively homogeneous suspension from which
solids settled gradually, and contained high concentrations of sugars
and starch, low concentrations of organic acids, and a near-neutral
pH. Brown juices, regardless of preparation method, were more
physically heterogeneous suspensions from which a protein-rich
precipitate settled rapidly. The brown juices typically had a pH
near 4.5 and contained high concentrations of lactic acid, modest
amounts of acetic acid, but very little sugars and starch.