Which purine base makes up most of this number?

Hypoxanthine — 87.2 mg of the 143.4 mg per 100 g total. The rest is adenine 27.1, guanine 15.8, xanthine 13.3.

Is this value for raw or cooked food?

Cooked — the source entry is Beef round (topside), cooked. Values per 100 g are not directly interchangeable between raw and cooked entries.

Why is hypoxanthine the largest fraction here?

Hypoxanthine accounts for 87.2 of the 143.4 mg total — about 61% of the number.

Beef round (topside), cooked

Moderate purine

Beef (other than organs)

Purine content

143 mgper 100 g

The level label is a plain categorization of the number above — not a statement about whether this food fits your diet. See the full disclaimer.

Composition — per 100 g

Purine, total	143 mg
— Adenine	27.1 mg
— Guanine	15.8 mg
— Hypoxanthine	87.2 mg
— Xanthine	13.3 mg
Fructose	No data available
Calories	250 kcal

Missing figures are shown as “No data available”; values are copied from the sources below and are never estimated. Laboratory values differ between studies and samples.

Where these numbers come from

Purine total and fractions: Kaneko, K., et al. (2014). Total purine and purine base content of common foodstuffs for facilitating nutritional therapy for gout and hyperuricemia. Biological and Pharmaceutical Bulletin, 37(5), 709-21..
Fructose and calories: USDA FoodData Central record #168709.

If you want something similar

Within beef (other than organs), the same table also lists Beef roast, cooked (unspecified) at 124.8 mg and Beef, sirloin, raw at 124.8 mg per 100 g.

From the author

Personal experience of someone living with gout

I eat it as usual between flares and skip it during one.

Personal experience — not medical advice. Read the full disclaimer.

Questions

Which purine base makes up most of this number?: Hypoxanthine — 87.2 mg of the 143.4 mg per 100 g total. The rest is adenine 27.1, guanine 15.8, xanthine 13.3.
Is this value for raw or cooked food?: Cooked — the source entry is Beef round (topside), cooked. Values per 100 g are not directly interchangeable between raw and cooked entries.
Why is hypoxanthine the largest fraction here?: Hypoxanthine accounts for 87.2 of the 143.4 mg total — about 61% of the number.

Looking for a different food? Search the full database — every entry there links back to its source, whether or not it has a page like this one. Or browse moderate purine foods.