NO - Besoin d'assistance

Processing and Bioavailability (WG2) page 32
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dehydrated by: a) conventional air-drying at 95'°C for 6-10 h; b) vacuum-drying at 55'°C for
4-8 h; dehydration by an osmotic treatment at 25°C in a 65'°Bx sucrose solution for 4 h
followed by vacuum-drying at 55'°C for 4-8 h. HPLC analysis of lycopene isomers on the
dehydrated samples showed that no cis isomers were detected in raw tomatoes, while 6.5% cis
isomers were found in osmo-vacuum-dried samples, 10.1% in vacuum-dried samples and
16.6% in air-dried samples. Maximum (3.9%) and minimum (2.4%) lycopene losses were
detected in the air-dried and osmo-vacuum-dried samples respectively. The authors concluded
that the osmotic treatment could reduce lycopene losses in comparison with other dehydration
methods: the protective effect was ascribed to the fact that sugar permeation into the tomato
tissues strengthened the bonding force of lycopene in the tomato matrix.
Data from other studies indicated that lycopene cis isomers accounted for 5.23% and
6.25% in commercial spray-dried and drum-dried tomato powders respectively (Nguyen and
Schwartz, 1998); in the above-mentioned study by Lovric et al. (1970), cis lycopene
represented 17% of total lycopene in foam-mat-dried tomato powder.
Comments and topics
The data confirm the considerable stability of lycopene during industrial transformation,
even in the case of extreme conditions (prolonged contact with hot air). Besides, the drying
process did not significantly affect the carotenoid content.
Is this step an RCPL ?
Q1 Q2 Q3 Q4 result
No Yes No