Grape juice

In the wine industry, grape juice that contains 7–23 percent of pulp, skins, stems and seeds is often referred to as must.

In California, Sultana (known there as 'Thompson Seedless') grapes are sometimes diverted from the raisin or table market to produce white juice.

Because of consumers' preferences for characteristics in color, flavor and aroma, grape juice is primarily produced from American cultivars of Vitis labrusca.

[2] The method of pasteurizing grape juice to halt fermentation has been attributed to an American physician and dentist, Thomas Bramwell Welch, in 1869.

During World War I, the company supplied "grapelade", a type of grape jam, to the military and advertised aggressively.

Subsequent development of new grape products and sponsorship of radio and television programs made the company successful.

[5] A small amount of citric acid is naturally found in grapes, and may be added for tart taste and antioxidant properties which inhibit oxidation, leading to a longer storage life.

This filtration process involves diatomaceous earth suspended in the grape juice as it passes through a pre-coated pad or plate.

The latter two processes are intended to reduce or prevent sedimentation once the juice is bottled and stored for a long duration of time.

Sterile filtration can be used for clarified grape juice with no particulate matter, which uses membranes with a pore size that is small enough to filter out microorganisms (<0.45 μm).

Although aseptic packaging is more costly, it maximizes shelf life and results in less heat damage and nutrient losses compared to hot filling.

Mustum is defined as "grape juice that is either fresh or preserved by methods that suspend its fermentation without altering its nature (for example, freezing).

"[15] Some Protestant denominations (specifically those which oppose the use of alcoholic beverages by members) use grape juice in their celebration of the Eucharist.

The Jewish legal code, the Talmud, in tractate Bava Batra 97b, permits the use of unfermented fresh grape juice for sacramental use.