Increased significance of food wastes: Selective recovery of added-value compounds

► Novel phase diagrams of aqueous two-phase systems composed of alcohol and salt were determined. ► The selective recovery of valuable chemical products (vanillin and ascorbic acid) from food samples was achieved. ► Vanillin is recovered in an alcohol-rich phase whereas l-ascorbic acid is recovered...

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Bibliographic Details
Published in:Food chemistry 2012-12, Vol.135 (4), p.2453-2461
Main Authors: Reis, Igor A.O., Santos, Samuel B., Santos, Ludmila A., Oliveira, Naiana, Freire, Mara G., Pereira, Jorge F.B., Ventura, Sónia P.M., Coutinho, João A.P., Soares, Cleide M.F., Lima, Álvaro S.
Format: Article
Language:English
Subjects:
1-propanol
acids
Alcohol
Antioxidant
Aqueous two-phase system
Ascorbic Acid - analysis
Ascorbic Acid - isolation & purification
atmospheric pressure
Benzaldehydes - analysis
Benzaldehydes - isolation & purification
Biological and medical sciences
Chemical Fractionation - methods
ethanol
Flavour
food additives
Food industries
Food waste
food wastes
Fundamental and applied biological sciences. Psychology
General aspects
Inorganic salt
isopropyl alcohol
l-Ascorbic acid
methanol
partition coefficients
Pollution and sludges
processed foods
Selective separation
Vanillin
Waste Products - analysis
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Summary:► Novel phase diagrams of aqueous two-phase systems composed of alcohol and salt were determined. ► The selective recovery of valuable chemical products (vanillin and ascorbic acid) from food samples was achieved. ► Vanillin is recovered in an alcohol-rich phase whereas l-ascorbic acid is recovered in a salt-rich phase. ► Based on the proposed method it is possible to improve the significance of food wastes by extracting added-value compounds. A single-step selective separation of two food additives was investigated using alcohol-salt aqueous two-phase systems (ATPS). The selective partitioning of two of the most used additives from a processed food waste material, vanillin and l-ascorbic acid, was successfully accomplished. The results obtained prove that alcohol-salt ATPS can be easily applied as cheaper processes for the selective recovery of valuable chemical products from food wastes and other sources. As a first approach, the phase diagrams of ATPS composed of different alcohol+inorganic salt+water were determined at 298 (±1)K and atmospheric pressure. The influence of methanol, ethanol, 1-propanol, and 2-propanol and K3PO4, K2HPO4 or KH2PO4/K2HPO4 in the design of the phase diagrams was addressed. After the evaluation of the phase diagrams behaviour, the influence of the phase forming constituents was assessed towards the partition coefficients and recovery percentages of vanillin and l-ascorbic acid among the coexisting phases. Both model systems and real processed food waste materials were employed. Using these ATPS as partitioning systems it is possible to recover and separate vanillin, which migrates for the alcohol-rich phase, from l-ascorbic acid, which preferentially partitions for the salt-rich phase.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2012.07.010