常见问题

What is the optimized Comparison Test for Low-Acyl Gellan Gum Quality?

To evaluate the performance of different sourced low-acyl gellan gum, a suspension speed test can be conducted. The method is designed to compare gelation efficiency and molecular weight indirectly by observing the suspension behavior of fruit particles in a standardized system.

Test Protocol

1. Formula

   • 0.025% low-acyl gellan gum + 0.08% calcium carbonate+0.05% Sodium Citrate 

   • Fully dissolve gellan gum with heating to 100°C, keep it for at least 5 mins, then cool to around 80°C and adjust pH to 4.2 by adding citric acid.

   • At ~80°C, pour the gellan gum solution into bottles pre-filled with 5% (by volume) fruit pulp (orange pulp, aloe vera ) .

2. Procedure

   • Seal the bottles and immediately place them in an ice-water bath.

   • Retrieve samples hourly and compare:

     • Observe which bottle shows fruit pulp suspension first.

     • Faster suspension indicates better gellan gum quality.

3. Interpretation

   • Higher molecular weight gellan gum typically forms a stronger gel network, leading to faster and more stable suspension.

   • Suspension speed serves as a proxy for gelation efficiency and molecular integrity.

Why This Test Works

• Sensitivity to Molecular Weight: Faster gelation at low temperature correlates with higher gum purity and molecular weight.

• Simulates Real Applications: Mimics the behavior of gellan gum in acidified beverage systems with particulate matter.

• Rapid and Practical: Results are visible within hours, enabling quick batch-to-batch or supplier comparisons.

Key Notes for Accuracy

• Control all variables:

  • Use identical fruit pulp type and particle size.

  • Maintain precise temperature during solution transfer.

• For quantitative comparison, measure the time to full suspension or use a standard suspension height scale.

This test provides a reliable, application-oriented indicator of low-acyl gellan gum functionality, especially for products requiring particle suspension in acidic beverages.

CAG hydrocolloids offers high quality low acyl gellan gum which can suspend the fruit pulp faster.