Subcritical water extraction process plant and its correlation between antioxidant activity
Subcritical water extraction process plants and their antioxidant activity of the correlation between 1 preface
as people more and more high to the requirement of quality of life, consumers are increasingly demanding on the quality of the product, so some new extraction technology has been developed, such as supercritical CO2 technology and subcritical water technology, the supercritical CO2 technology suitable for extracting weak polarity composition, join in the process of extraction of entrainer can extract polarity strong material, 'high pressure water' or 'subcritical water' refers to the water temperature reaches the boiling point (
And the critical point (
Between, in this temperature range, the density of water is greater than the critical density of water, at the same time, the dielectric constant of water and polarity have been down, finally the result is some compounds in subcritical water solubility will rise.
antioxidant activity in delay the oxidation of fats and oils play an important role in the process, in the process of the antioxidant can play free radicals, coordination some potentially oxidation of metal ions, reducing agent and quenching singlet oxygen.
At the same time, the antioxidants in human diseases, such as heart disease, malaria, neurodegenerative diseases, AIDS, cancer, and also play an important role in the process of aging.
In biological systems, antioxidants can inhibit the oxidation of some of the produce reactive oxygen species in the human body chain reaction, so as to prevent the occurrence of degenerative diseases and cancer.
A lot of antioxidant polyphenols compounds isolated from higher plants, such as flavonoid, phenolic compounds, more stronger because of their ability of scavenging free radicals, and except polyphenols antioxidant effect and antibacterial, anti-inflammatory and antiviral effect.
But some synthetic antioxidant drugs often has certain harm to human body health, such as renal edema, therefore, the market demand for natural antioxidant is rapid increase.
2 during the experiment using a efficient, simple, good selectivity to extract tianshan snow chrysanthemum � � � flavonoid polyphenol compounds of a subcritical water extraction method, using this method can effectively extract the tianshan snow chrysanthemum medium yellow ketone and polyphenol compounds, and the antioxidant activity of the extract is higher.
The experimental results show that using subcritical water extract flavonoids in tianshan snow chrysanthemum light scavenger of free radicals ability stronger than the butylated hydroxytoluene, remove DPPH free radicals while weak in the ability of Trolox and VC, but stronger than VE and butylated hydroxytoluene, R -
Carotene a linoleic acid system, the most of tianshan snow chrysanthemum under different temperature of subcritical water extract total antioxidant activity were lower than that of reference substance butylated hydroxytoluene and rutin, but its total antioxidant activity were higher than 50%, this very strong antioxidant activity, prove tianshan snow chrysanthemum extract has certain USES in medicine, can be used as a kind of natural antioxidants, but need to flavonoids in tianshan snow chrysanthemum do a specific research, studies the contribution of the various compounds against oxidation activity, at the same time tianshan snow chrysanthemum extract in traditional markets have a broad prospect.
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