Acorn
The acorn, or oaknut, is the nut of the oaks and their close relatives (genera Quercus and Lithocarpus, in the family Fagaceae). It usually contains one seed (occasionally two seeds), enclosed in a tough, leathery shell, and borne in a cup-shaped cupule. Acorns are 1–6 cm (1⁄2–2+1⁄2 in) long and 0.8–4 cm (3⁄8–1+5⁄8 in) on the fat side. Acorns take between 5 and 24 months (depending on the species) to mature; see the list of Quercus species for details of oak classification, in which acorn morphology and phenology are important factors.
| Nutritional value per 100 g (3.5 oz) | |
|---|---|
| Energy | 1,619 kJ (387 kcal) |
40.75 g | |
23.85 g | |
| Saturated | 3.102 g |
| Monounsaturated | 15.109 g |
| Polyunsaturated | 4.596 g |
Protein | 6.15 g |
| Tryptophan | 0.074 g |
| Threonine | 0.236 g |
| Isoleucine | 0.285 g |
| Leucine | 0.489 g |
| Lysine | 0.384 g |
| Methionine | 0.103 g |
| Cystine | 0.109 g |
| Phenylalanine | 0.269 g |
| Tyrosine | 0.187 g |
| Valine | 0.345 g |
| Arginine | 0.473 g |
| Histidine | 0.170 g |
| Alanine | 0.350 g |
| Aspartic acid | 0.635 g |
| Glutamic acid | 0.986 g |
| Glycine | 0.285 g |
| Proline | 0.246 g |
| Serine | 0.261 g |
| Vitamins | Quantity %DV† |
| Vitamin A equiv. | 0% 2 μg |
| Thiamine (B1) | 9% 0.112 mg |
| Riboflavin (B2) | 9% 0.118 mg |
| Niacin (B3) | 11% 1.827 mg |
| Pantothenic acid (B5) | 14% 0.715 mg |
| Vitamin B6 | 31% 0.528 mg |
| Folate (B9) | 22% 87 μg |
| Vitamin C | 0% 0.0 mg |
| Minerals | Quantity %DV† |
| Calcium | 3% 41 mg |
| Copper | 69% .621 mg |
| Iron | 4% 0.79 mg |
| Magnesium | 15% 62 mg |
| Manganese | 58% 1.337 mg |
| Phosphorus | 6% 79 mg |
| Potassium | 18% 539 mg |
| Sodium | 0% 0 mg |
| Zinc | 5% 0.51 mg |
| Other constituents | Quantity |
| Water | 27.9 g |
| †Percentages estimated using US recommendations for adults, except for potassium, which is estimated based on expert recommendation from the National Academies. | |
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