| Author | Rao, Mukku Shrinivas |
| Call Number | AIT Thesis no. AE-92-16 |
| Subject(s) | Coloring matter in food
|
| Note | A thesis submitted in partial fulfillment of the requirements for the Degree of
Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A study was conducted to test the feasibility of extracting oleoresin and
color from thai red chilli by the solvent extraction process. The effect of
process conditions and different processing parameters such as extraction
temperature, extraction time, solvent type, product condition and particle size
on the pigment yield were studied. In addition, chemical and physical
properties of the oleoresin were measured and the storage stability of dried
chilli powder as well as the resulting oleoresin was tested.
Extraction with acetone resulted in a maximum color intensity of t he
extracted pigment, with a concentration of 5580 µg/g (!3-carotene equivalent).
However, 95 % ethanol as extracting solvent gave maximum oleoresin yield of
4.36 g from a 25 g chilli sample.
Experiments to investigate the effect of product condition (fresh chilli)
on the pigment yield, indicated that for samples having moisture contents of
83.1 1 % and 10.87 3, the corresponding oleoresin yields were 0.64 g and 0.24
g per unit g of dry matter sample, respectively.
The investigation concluded that smallest particle f:>ize of the dried chilli
powder tested (0.21 mm) had the highest pigment yield. Extraction of
oleoresin from 25 g raw sample having a particle size of 0.21 mm gave an
oleoresin yield of 9.27 g.
The pH, percent acidity and density of the extracted pigment were 3.55,
5.55 % and 1.17 respectively. The pigment was soluble in distilled water and
milk and produced a orange coloration.
The study of different storage conditions on the storage stability of
chilli powders and pigment, indicated that storage in the dark with
refrigerated conditions of 5 ° C, prevented deterioration of the pigment.
A pilot scale oleoresin extractor was designed and fabricated based on
the optimum process conditions of extraction obtained above. The extractor
gave a yield of 152.6 g/kg raw sample or had a yield ratio of 15 3 with
commercial ethanol as the solvent. |
| Year | 1992 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Illangantileke, Sarath G. ;Athapol Noomhorm
|
| Examination Committee(s) | Jindal, Vinod Kumar ;Yakupitiyage, Amararatne
|
| Scholarship Donor(s) | The Royal Norwegian Government; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1992 |