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Development of new food additives extracted from the solid residue of the tomato processing industry for application in functional foods


Dietetic fibre can be extracted from the extraction residue of the CO2 extraction by means of a hot extraction process in order to obtain an additive for the food industry. First a water extraction it’s performed to remove soluble proteins and polysaccharides. If after the previous treatment still are there assailable polysaccharides or proteins, enzymatic digestion is carried out to remove then from the fibre
Purified Enzymes from tomato extracts
The Lycopene containing wax (up to 1,3% Lycopene; yield: 1,5% dry wt) can be extracted from the dried, milled tomato residue as well as from the intermediate dried, milled residue by means of supercritical CO2 under the following conditions: -T1= 80 °C ; T2 = 35 °C -P1 = 296 bar; p2 = 50 bar -Using 15% w/w Ethanol as co-solvent The extract is separated by centrifugation in order to obtain the Lycopene containing wax in the middle fraction. The Lycopene containing wax can be extracted separately when only the dried, milled peels are extracted under the same conditions as described above.
Process for the extraction by means of supercritical CO2: A process has been worked out for the production of lycopene containing tomato seed oil by extracting 600 g batches of dried milled intermediate residue or final residue of a tomato processing plant. 20% Ethanol is used as co-solvent Extraction conditions: P= 296 bar T= 80°C Precipitation conditions: P= 50 bar T= 35 °C The yield in tomato seed oil is, raw material depending, 3-6%. The Lycopene yield is, also raw material depending, 15 - 180 ppm The extract is separated by centrifugation in order to obtain the Lycopene containing oil in the lowest fraction. The oil is sensitive to oxidation which can be prevented by the addition of 0,1% Vitamin E.