Fruit juice consumption could help protect against Alzheimer's.
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There is a high degree of consumer awareness of the term 'antioxidant' and its relation to health and well-being - even if many people do not understand the mechanism. The study, said to be the first of its kind in the UK, could encourage more people to include juices in their diet as a relatively minor change that could potentially have a role in avoiding chronic illness.
In particular lead researcher Professor Alan Crozier said his team's findings are relevant to consumers wishing to reduce their risk of age-related dementia, in the light of a study published last year that indicated long-term fruit juice consumption could help protect against Alzheimer's disease.
"Phenolic antioxidants are bioactive compounds in fruits, vegetables and beverages that play an active role in the human body. By quenching free radicals they help maintain oxidative balance and are thought to play a key role in maintaining and improving health," explained Prof Alan Crozier.
The new study draws particular attention to the juice of Concord grapes, which came out on top in terms of highest overall antioxidant capacity and the highest and broadest range of polyphenols.
Alan Crozier, Professor of Plant Biochemistry and Human Nutrition, who conducted the study, said: "Not all fruit juices are the same. The findings reveal that the variety of phenolic compounds and antioxidant capacity of the individual juices varied markedly."
Other top scorers were cloudy apple juice and cranberry juice.
Crozier and his team assessed the total phenolic content of 13 commercially available fruit juices and juice drinks deemed to be the most popular in the UK using the Folin-Ciocalteu assay.
The products were: Spray Classic Cranberry; Welch's Purple Grape; Tesco Pure Pressed Red Grape; Pomegreat Pomegranate; Tesco Pure Apple (clear); Copella Apple (cloudy); Tesco Pure Grapefruit; Tesco Value Pure Orange (concentrate); Tropicana Pure Premium Smooth Orange (squeezed); Tropicana Pure Premium Tropical Fruit; Tesco Pure Pressed White Grape; Tesco Pure Pineapple; Del Monte Premium Tomato.
Individual phenolic compounds were identified and quantified, and catechin content and degree of polymerization of proanthocyanidins were analyzed. The main components in purple grape juice were flavan-3-ols, anthocyanins, and hydroxycinnamates, together accounting for 93 per cent of the total phenolic content. The results for the red grape juice were said to be equal to those for a Beaujolais red wine. Interestingly, white grape juice, mainly containing hydroxycinnamates, had the lowest total phenolic content.
Alzheimer's Donation
Donate Online Now
.
There is a high degree of consumer awareness of the term 'antioxidant' and its relation to health and well-being - even if many people do not understand the mechanism. The study, said to be the first of its kind in the UK, could encourage more people to include juices in their diet as a relatively minor change that could potentially have a role in avoiding chronic illness.
In particular lead researcher Professor Alan Crozier said his team's findings are relevant to consumers wishing to reduce their risk of age-related dementia, in the light of a study published last year that indicated long-term fruit juice consumption could help protect against Alzheimer's disease.
"Phenolic antioxidants are bioactive compounds in fruits, vegetables and beverages that play an active role in the human body. By quenching free radicals they help maintain oxidative balance and are thought to play a key role in maintaining and improving health," explained Prof Alan Crozier.
The new study draws particular attention to the juice of Concord grapes, which came out on top in terms of highest overall antioxidant capacity and the highest and broadest range of polyphenols.
Alan Crozier, Professor of Plant Biochemistry and Human Nutrition, who conducted the study, said: "Not all fruit juices are the same. The findings reveal that the variety of phenolic compounds and antioxidant capacity of the individual juices varied markedly."
Other top scorers were cloudy apple juice and cranberry juice.
Crozier and his team assessed the total phenolic content of 13 commercially available fruit juices and juice drinks deemed to be the most popular in the UK using the Folin-Ciocalteu assay.
The products were: Spray Classic Cranberry; Welch's Purple Grape; Tesco Pure Pressed Red Grape; Pomegreat Pomegranate; Tesco Pure Apple (clear); Copella Apple (cloudy); Tesco Pure Grapefruit; Tesco Value Pure Orange (concentrate); Tropicana Pure Premium Smooth Orange (squeezed); Tropicana Pure Premium Tropical Fruit; Tesco Pure Pressed White Grape; Tesco Pure Pineapple; Del Monte Premium Tomato.
Individual phenolic compounds were identified and quantified, and catechin content and degree of polymerization of proanthocyanidins were analyzed. The main components in purple grape juice were flavan-3-ols, anthocyanins, and hydroxycinnamates, together accounting for 93 per cent of the total phenolic content. The results for the red grape juice were said to be equal to those for a Beaujolais red wine. Interestingly, white grape juice, mainly containing hydroxycinnamates, had the lowest total phenolic content.
posted by Valery Yermalitsky at
6:18 AM
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