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Goji-BerriesORAC LEVELS

ORAC is the standard test, adopted by the US Department of Agriculture, to measure the potency of antioxidants in food. The test was developed by Dr. Guohua Cao, a physician and chemist who worked at the National Institute on Aging in Baltimore, Maryland. The ORAC test, though not the be all and end all of antioxidant testing, gives a good idea of the free-radical-destroying potential of a given food. It does this by measuring the time an antioxidant takes to react as well as the capacity of antioxidants within the sample food. It combines these elements into one measurement that is commonly expressed in terms of a 100 gram sample.
 
It has been suggested that humans should consume about 5000 ORAC units a day for maximum benefits. Unfortunately, most people do not eat nearly enough vegetables and fruit, or the right type of vegetables and fruit, to achieve this. For example, to get your daily ORAC dose from apples, you would need to eat 2,294 grams of apple (or about 22 apples).

 

Fruits

ORAC Score / 100 Grams

Grams Needed to Reach DRI

Goji Berries

25,300

20

Black Raspberries

7,700

65

Prunes

5,770

87

Bilberry

4,460

112

Pomegranates

3,307

151

Raisins

2,830

177

Blueberries

2,400

208

Red Raspberries

2,400

208

Blackberries

2,036

246

Strawberries

1,540

325

Noni Fruit

1,506

332

Plums

949

527

Oranges

750

667

Cherries

670

746

Red grapes

739

677

Pink grapefruit

495

1010

White grapefruit

460

1087

Apples

218

2294

Banana

210

2381

Pears

134

3731

Watermelon

100

5000




Vegetables

ORAC Score

Grams Needed to Reach DRI

Garlic

1939

258

Spinach

1,770

282

Steamed spinach

909

550

Yellow squash

1,150

435

Brussels sprouts

980

510

Alfalfa sprouts

930

538

Broccoli

880

568



 

The subject of ORAC is more complex than most people realize. The letters ORAC are an acronym for Oxygen Radical Absorbance Capacity. What happens in the marketplace is often quite misleading as we find that different units of measure are quoted with little or no fine print defining these units. Also there are a number of different ORAC tests which measure different types of antioxidant activity. For this reason we always show a general chart without units of measure simply expressing ratio. This gives an honest expression of the power of goji compared to other fruits.

We are often asked how goji compares to other superfruits like acai or even green tea for example. This requires an explanation of the different types of antioxidant chemistry relating to the classes of compounds known as bioflavenoids, carotenoids, anthocyanins,polyphenols and many others. A good discussion of this subject can be found at http://en.wikipedia.org/wiki/Antioxidant.

For the measurement of antioxidant activity we have found the best testing to be done by Brunswick Laboratories. They present an overview of this subject matter at http://www.brunswicklabs.com/overview_antioxidants.shtml.

To clarify the nonsense on the internet about the famous quote regarding goji having 500 times more Vitamin C than oranges, we must tell you that it is simply not true. It is the carotenoid family of compounds including astaxanthin and zeaxanthan that give the goji much of its ORAC power.

ORAC Scale


 



 

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