Fruit juice processing
Practical Action
Compound Comments
Sulphites Sulphur dioxide gas and the sodium or potassium salts
and sulphur of sulphite, bisulphite or metabisulphite are the most
dioxide
commonly used forms. Sulphurous acid inhibits yeasts,
moulds and bacteria. Sulphur dioxide is mainly used to
preserve the colour of fruits during drying.
Sorbic acid Sorbic acid and sodium and potassium sorbate are
widely used to inhibit the growth of moulds and yeasts.
The activity of sorbic acid increases as the pH
decreases. Sorbic acid and its salts are practically
tasteless and odourless in foods when used at levels
less than 0.3%.
Benzoic
Benzoic acid, in the form of sodium benzoate is a
acid widely used preservative. It occurs naturally in
cranberries, cinnamon and cloves and is well suited for
used in acid foods. It is often used in combination with
sorbic acid at levels from 0.05-0.1% b y weight.
Citric acid Citric acid is the main acid found naturally in citrus
fruits. It is widely used in carbonated beverages and as
an acidifier of foods. It is a less effective anti-microbial
agent than other acids.
Table 3: Permitted preservatives used in fruit juices and beverages.
Commonly used
levels
0.005-0.2%
0.05-0.2
0.03-0.2%
No limit
Equipment suppliers
Note: This is a selective list of suppliers and does not imply endorsement by Practical Action.
Juice extractors and pulpers
A variety of juice extractors and pulpers is available from a wide range of suppliers. They are
available in different capacities and either manual or powered (either electric of diesel).
Kenwood Limited
New Lane
Havant
Hampshire, PO9 2NH
United Kingdom
Tel: +44 (0) 23 9247 6000
Fax: +44 (0) 23 9239 2400
Website: http://www.kenwood.co.uk
Buhler (India) Pvt Ltd
13-D, K A I D B Industrial Area, Attibele
Bangalore
Karnataka 562107
India
Tel: +91 80- 27820000
Fax: +91 80-7820001
Website: www.buhlergroup.com
Alvan Blanch
Chelworth
Malmesbury
Wiltshire, SN16 9SG
United Kingdom
Tel: +44 (0) 666 577333
Fax: +44 (0) 666 577339
E-mail: info@alvanblanch.co.uk
Website: http://www.alvanblanch.co.uk
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