Cellulase for Fruit Juice Processing

Cellulase treatment can be investigated when fruit tissue retains juice or limits pressing performance. The useful endpoint is more saleable juice with the required flavour, colour and cloud. Stronger tissue breakdown is not automatically a better result, especially for cloudy juice or pulp-containing drinks.

What cellulase does in fruit mash

Cellulase hydrolyses accessible cellulose in plant cell walls. Pectinase addresses pectin, a different cell-wall component. Their relative contributions depend on the fruit, maturity, crushing method and product specification. A cellulase trial should establish whether cellulose is a meaningful processing constraint before a combination is adopted.

Which product should I choose?

• Liquid cellulase is a convenient starting formulation for uniform addition to crushed fruit.
• Powder cellulase is an alternative when dry handling suits the process; check dispersion and the effect of the formulation carrier on the finished juice.
• Endo-cellulase can be screened for controlled internal cellulose cleavage. Exo-cellulase is a more targeted hydrolysis option to evaluate only when that additional activity has a measurable benefit.
• Include pectinase when pectin-related viscosity, pressing or clarification is the suspected bottleneck. Compare it alone as well as in combination with cellulase.

Where to add the enzyme

For extraction trials, add enzyme after consistent crushing and before pressing or centrifugation, while tissue is still present. Ensure it reaches the whole mash. For a clarification problem in already extracted juice, first identify the material causing haze; an extraction-stage cellulase result does not establish a clarification treatment.

Measure the fruit's native pH and select a grade compatible with it. Avoid changing juice acidity just to match a nominal enzyme optimum without evaluating taste and process consequences. Choose a temperature and hold time supported by the actual preparation, and record the temperature within the mash rather than only the jacket setting.

A practical bench-development workflow

• Divide one fruit lot into equal mash portions. Record variety, maturity, mass, soluble solids, pH and the crushing conditions.
• Compare untreated mash, cellulase alone, pectinase alone and their combination. Keep any added water identical between treatments.
• Obtain a grade-specific starting dose and screen 0.5×, 1× and 2× for the most promising treatment. An illustrative time series is 15, 30 and 60 minutes, subject to enzyme stability and the permitted processing hold.
• Use identical mixing and separation settings. Record press pressure, duration, filter medium and recovered juice mass; uncontrolled pressing can obscure the enzyme effect.
• Repeat the best treatment and control across independent fruit lots. Process both through the intended finishing and preservation stages before judging the final result.

Calculate dose and juice recovery

Use a clear basis such as mL product/kg fresh fruit mash. If a trial-selected dose is d mL/kg and the batch contains M kg mash, add d × M mL. A hypothetical 0.5 mL/kg dose on 200 kg mash requires 100 mL; this illustrates calculation only.

Report juice recovery as 100 × recovered juice mass / starting mash mass, with added water stated separately. Also compare recovered soluble solids so dilution or extra suspended pulp is not mistaken for improved extraction. Record each enzyme dose separately in combination trials.

Troubleshooting

• No extraction improvement: check whether pressing, crushing or a non-cellulose component is limiting. Confirm enzyme dispersion and survival at the actual pH and temperature.
• More juice but slower filtration: inspect fines and suspended solids; excessive tissue disintegration can create an additional separation load.
• Cloud or body is lost: reduce treatment severity and reassess the enzyme combination against the intended cloudy-juice specification.
• Colour or flavour changes: compare holding time, temperature and oxygen exposure with a matched untreated control before attributing the change to the enzyme.

Finishing and quality checks

Measure recovery, press-cake moisture, filtration rate, turbidity, viscosity, colour and sensory properties using consistent methods. Assess cloud and sediment after the final formulation and heat treatment. For clear juice, define the clarity endpoint; for cloudy juice, define the cloud that must remain.

Validate the enzyme-stopping step separately from microbial preservation. A warm enzyme hold is not a pasteurisation or shelf-life specification. Confirm residual activity where it could alter the product during storage.

Evidence and scope

Pal and Khanum's pineapple study compared xylanase with combinations including pectinase and cellulase and reported treatment-dependent yield and clarity. It supports testing complementary cell-wall activities, but does not establish a universal fruit recipe or guaranteed improvement with these commercial products. The trial settings above are development proposals.

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Process development and supply

Share your feedstock, batch size, solids loading, temperature and pH profile, available treatment time and target specification with Scientific & Technical. These details help match a preparation and starting trial dose to your process. Select the relevant products below to view bottle sizes, current pricing and availability, and buy online.

Use the current technical and safety data sheets for the supplied grade. Avoid enzyme dust and aerosols, and confirm storage and handling requirements before preparing trial solutions.