Internal maturity standards for citrus fruit

Page last updated: Wednesday, 18 January 2017 - 11:38am

Please note: This content may be out of date and is currently under review.

The strength of the Australian citrus industry and its profile in domestic and export markets rely heavily on the consistency and taste of its products.

To ensure good tasting fruit is available to consumers of Western Australian citrus, the citrus industry has developed minimum internal maturity standards.

Western Australian standards

Internal maturity standards are based on the three key parameters that affect the taste and acceptability of citrus fruits:

  • juiciness
  • sweetness
  • balance between sweetness and tartness.

The Western Australian standards have been written into the Citrus Fruits Grading Code 2008, which was gazetted by the Western Australian Government in January 2009.

All citrus fruit produced in Western Australia and sold on the fresh market must meet these minimum standards.

2015 internal maturity standards

Western Australian minimum internal maturity standards set for different citrus types for the 2015 citrus season are found in Tables 1, 2 and 3 below.

Table 1 Minimum Brix:acid ratio

Fruit type

Minimum Brix:acid ratio 

Mandarins

8.0 to 1

Oranges (navel only)

8.0 to 1

Oranges (other than navel) 

7.0 to 1

Grapefruits and pomelos 

6.5 to 1

Hybrids of any species

8.0 to 1

Table 2 Total soluble solids (sugar level)

Fruit type

Total soluble solids determination at 20°C

Mandarins

8°Brix

Oranges

8°Brix

Grapefruits and pomelos 

8°Brix

Hybrids of any species 

8°Brix

Table 3 Minimum juice content

Fruit type

Minimum juice content (%) 

Lemons

25

Mandarins

28

Oranges

33

Grapefruits and pomelos 

33

Limes

33

Hybrids of any species

33

National standards

Citrus Australia provides national citrus quality standards which are based on the similar parameters as the WA standards such as brix and acid levels of fruit. For more information visit the Citrus Australia website and search for 'standards'.

Contact information

Bronwyn Walsh
+61 (0)8 9368 3786
Kevin Lacey
+61 (0)8 9368 3546

Author

Bronwyn Walsh