Can an increase in drying temperature (> 70 degrees) result in a decrease in colour parameters (LAB) of fruits, while total carotenoid and lycopene content increases? if yes, what is the scientific explanation for this occurrence?
I think the following paper link (paper) will help you:
- www.scielo.cl/pdf/chiljar/v73n3/at13.pdf
- www.ipcbee.com/vol71/012-ICNFS2014-A1022.pdf
- https://www.researchgate.net/publication/256804591_Degradation_kinetics_of_lycopene_b-carotene_and_ascorbic_acid_in_tomatoes_during_hot_air_drying
- http://www.eajournals.org/wp-content/uploads/The-Changes-of-Total-Carotenoid-Content-Of-Gac-Momordica-Cochinchinensis-Spreng-Powder-Product-In-Accelerated.pdf
Article Degradation kinetics of lycopene, β-carotene and ascorbic ac...
Johnson nice question . Carotenoids are naturally occurring yellow , red and orange pigments , provide provitamin A activation and protection against peroxidation .They are highly unsaturated having many conjugated double bonds , therefore , make them highly susceptible to thermo-decomposition . Lycopene is one the most commonly formed carotenoids. Studies have shown , lycopene is most susceptible to decomposition and lutein as most resistant to decomposition . Studies have also shown , no significant difference between 9-cis forms and trans B-carotenes when compared their sensitivity amongst different isomeric forms. Find below two very good PDFs for further reading .
Thank you Anoop. The attached papers were really helpful.
Regards,
Jay
Great answer Dr. From experience, i think it possible for an increase in drying temperature to result in a decrease in some colour space coordinate (e.g l*, b*) while a* coordinate increases. While this increase may not result in the changes of some carotene as you rightly observed. Because, a higher drying temperature (>70 degrees) could result in sugar browning and other non-oxidative reaction. However, due to a short exposure time (shorter drying time) to heat during drying at high temperatures, the total carotenoid may not be affected.
Yes , you are right Daniel.o depends on the kind of isomers that are exposed to such temperature, cis or trans form , however there is usually no difference with regard to their comparative susceptibility.
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