Starch Iodine Pre-mix Reagent for Apple maturity Testing 100ml
50510-100ml

Starch Iodine Pre-mix Reagent for Apple maturity Testing 

Catalogue number 50510

Specification: 

Iodine 2.5g per Litre

Potassium Iodide 10g per litre

Product information:-

CAS 7553-56-2  ; CAS 7681-11-0 ; Water to 100%

Non-hazardous for shipping

Using the product:-

Starch in the fruit flesh will be converted to sugars as apple fruits mature and ripen. Therefore, the stage of maturity of apple fruits can be determined by performing a simple starch-iodine test. As iodine binds to the starch molecules in the apple flesh, it turns them into a blue-black coloration; while cells that contain no starch available  for conversion to sugars, will have no color change. This test records the degree of starch disappearance in the flesh, as starch concentration decreases as the fruit matures and ripens.

The pattern for starch disappearance is specific for each apple cultivar/strain.  The common starch index rating system is on a scale from 1 to 8 where 1 is full starch (all blue-black) and 8 is starch-free (no stain)