Rapid Visco Analyser (RVA) for Unmodified Dent Corn Starches

The Rapid Visco Analyzer (RVA) is a cooking stirring viscometer that has been optimized for testing viscous properties. It features ramped temperature, variable shear profiles, a range of international standard methods and the flexibility to accommodate custom-made profiles.

Rapid Visco Analyser (RVA) for Unmodified Dent Corn Starches

 Image Credit: PerkinElmer Food Safety and Quality

Its distinct combination of automation potential, speed, precision and flexibility makes the RVA suitable for applications involving quality and process control, quality assurance and product development.

The RVA is also ideally suited to the assessment of the cooked viscosity of unmodified dent corn starch, as well as the quality control of starch employed in the paper and food industries.

Description

This method can be used with unmodified dent corn starches. The final temperature of 65 °C (149 °F) is employed to rapidly stabilize viscosity while minimizing the risk of retrogradation.

Example

Pasting curve of unmodified corn starch using the ST-06 Method, showing the commonly measured parameters.

Figure 1. Pasting curve of unmodified corn starch using the ST-06 Method, showing the commonly measured parameters. Image Credit: PerkinElmer Food Safety and Quality

Table 1. Source: PerkinElmer Food Safety and Quality

Analysis Starch Type All
(1) Peak viscosity (cP)*
(2) Viscosity at 9.00 min (cP)*
(3) Viscosity at end of test (cP)*

*Subtract viscosity at 0.50 minutes from value to give final result.

Method

A 15-minute pasting profile was used for this study.

Sample Preparation

Starch concentration (in distilled water) was selected based on appropriate starch viscosity values, as illustrated in the relative viscosity table below. The goal of this process was to reach an end viscosity of 800-1500 cP.

Table 2. Source: PerkinElmer Food Safety and Quality

Relative
Viscosity
Starch Concentration
(dry solids, % w/w)
Example of
Starch
Unmodified High 8 Pure Food Powder

 

Profile

Table 3. Source: PerkinElmer Food Safety and Quality

Time Type Value
00:00:00 Temp 50 °C
00:00:00 Speed 960 rpm
00:00:10 Speed 160 rpm
00:00:30 Temp 50 °C
00:04:30 Temp 98 °C
00:09:00 Temp 98 °C
00:11:00 Temp 65 °C
00:15:00 End  
Idle Temperature: 50 ± 1 °C
Time Between Readings: 4 s

 

Measure

Measurements were conducted as follows:

  • PV: Peak viscosity (cP)*
  • V9: Viscosity at 9 minutes (cP)*
  • FV: Final viscosity (cP)*

*Viscosity at 0.50 min should be subtracted from the value to obtain the final result.

This information has been sourced, reviewed and adapted from materials provided by PerkinElmer Food Safety and Quality.

For more information on this source, please visit PerkinElmer Food Safety and Quality.

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