Extraction, Stabilistiaon and Utilisation of
Natural Food Colours from Grape Fruit Rind
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Author:P. Adhiyaman, S. Kanchana and G. Hemalatha
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:99, Issue:oct-dec
DOI: https://doi.org/10.29321/MAJ.10.100224
Abstract
Investigation was carried out to develop natural food colour powder from grape fruit rind
(waste) by spray drying. The colour was extracted with water and solvents viz., acetone,
ethanol and citric acid. The experimental results showed that the 3 % citric acid extraction
was best and the filtrate was spray dried at different drying air temperature (180, 200 and
220ºC) and flow rate (25 and 30 ml / min) using 10, 15 and 20 % of maltodextrin (MD). The yield
recovery was maximum at 200ºC with a flow rate of 25 ml / min at 20 % maltodextrin. The
stability of the colour was analysed by exposing the colour powder in various concentrations
of pH, preservative and temperatures followed by packed in aluminium pouch (P 1
), brown pet
bottle (P 2
) and brown glass bottle (P 3 ). The packed samples were stored in room (R 1 ) and
refrigeration (R2 ) temperatures for 3 months and analyzed their colour intensity (L* a* b*) and
moisture content. The results revealed that the addition of preservative, increasing
temperature, pH and storage periods had affected the stability of colour and moisture content.
The samples packed in P 3 had better colour retention than P2 and P 1 during storage . Colour
intensity of developed lollipop and icing with grape skin colour powder had best colour
strength and sensory attributes than synthetic food colour (carmoesin).
Key words : Grape skin (waste), Spray drying, Grape skin colour powder, Preservatives