Rhubarb (Stalks)
RHUBARB (stalks)
Rhubarb (stalks) contains few vitamins, except for vitamin K (phylloquinone) (24.4% of the daily requirement in 100 g) and vitamin C (ascorbic acid) (21.4%).
The main minerals are silicon (40.7%), calcium (17.9%), vanadium (17.3%), nickel (12.8%), potassium (11.6%), manganese (10.6%), and chromium (7.9%).
Rhubarb stalks contain quite a lot of pectin (14.0% of the daily norm per 100 g) and fiber (12.8%), small amounts of starch (0.22 g per 100 g) and sucrose (0.1 g).
The total purine base content in 100 g of rhubarb stalks is low, amounting to 1.7% of the daily requirement.
The possible danger of consuming rhubarb
(especially “adult” and older stalks) is due to their high content of oxalic acid
, which, when it enters the human body, binds with calcium cations (it can also bind with magnesium and divalent iron cations, but this occurs less frequently in the human body) and forms salts – oxalates. These oxalic acid salts – oxalates – concentrate and form crystals, well known as kidney stones
. People with kidney stones, gout, or rheumatoid arthritis should avoid foods rich in oxalates.
During the development of stems in ontogenesis, their oxalic acid content increases. Stems up to 35 days old are best for consumption. Their oxalic acid content ranges from 0.15% to 0.53% (i.e., from 150 to 530 mg per 100 g). Young stalks mainly contain succinic and malic acids.
According to the recommendations of the Ministry of Health, the daily intake of oxalic acid should not exceed 400 mg. Thus, 100 g of young rhubarb stalks contain on average 85% of the maximum permissible level of its consumption.
Calories per 100 g: 16 kcal
Water per 100 g: 91.5 g
Ash per 100 g: 1.0 g
Water per 100 g: 91.5 g
Ash per 100 g: 1.0 g
CHEMICAL COMPOSITION
Vitamins, macro- and microelements, nutrients per 100 g
VITAMINS
| Name | Content, mass fraction per 100 g of product | % of daily requirement | |
| in numbers | visually | ||
| Vitamin B1 (thiamine) | 0.010-0.042 mg | 1.5 |  |
| Vitamin B2 (riboflavin) | 0.022-0.041 mg | 1.6 | |
| Vitamin B5 (pantothenic acid) | 0.085 | 1.7 | |
| Vitamin B6 (pyridoxine) | 0.025-0.064 mg | 2.2 |  |
| Vitamin B9 (folic acid) | 6.0-9.6 mcg | 2 | |
| Vitamin B12 (cyanocobalamin) | 0.0 | 0 | |
| Vitamin C (ascorbic acid) | 6.0-24.0 mg | 21.4 |  |
| Vitamin E (alpha-tocopherol) | 0.260-0.410 mg | 2.2 | |
| Beta-tocopherol | 0 | 0 | |
| Gamma-tocopherol | 0 | 0 | |
| Delta-tocopherol | 0 | 0 | |
| Vitamin D (ergocalciferol) | 0.0 | 0 | |
| Vitamin PP (nicotinic acid) | 0.190-0.380 mg | 1.4 | |
| Vitamin K (phylloquinone) | 29.3 | 24.4 |  |
| Biotin | 0.6 | 1 | |
| Beta-carotene | 61.0-124.0 | 1.9 | |
| Alpha-carotene | 0.0 | 0 | |
| Lutein + zeaxanthin | 170.0 | 2.8 | |
| Beta-cryptoxanthin | 0 | 0 | |
| Lycopene | 0.0 | 0 | |
| Choline | 6.1 | 1.2 | |
| Betaine trimethylglycine | 5.0 | 0 | |
| Methylmethionine sulfonium (vitamin U) | 0.4 | 0.2 | |
* Full jug – 100% of the daily norm; empty – 0-1% of the daily norm.
MINERAL ELEMENTS
Macroelements
| Name | Content, mass fraction per 100 g of product | % of daily requirement | |
| in numbers | Visually | ||
| Potassium | 221.0-360.0 mg | 11.6 |  |
| Calcium | 23.0-370.0 mg | 17.9 | |
| Silicon | 12.2 | 40.7 |  |
| Magnesium | 11.1-13.5 mg | 3.1 | |
| Sodium | 2.2-4.5 mg | 0 | |
| Sulfur | 7.2 | 0.7 | |
| Phosphorus | 19.2-31.8 mg | 3 | |
| Chlorine | 18.8 | 0.8 | |
Trace elements
| Name | Content, mass fraction per 100 g of product | % of daily requirement | |
| in numbers | Visually | ||
| Aluminum | 3.1 μg | 0.008 | |
| Boron | 2.7 μg | 3.9 | |
| Vanadium | 6.9 | 17 | |
| Iron | 0.11-0.47 mg | 1.9 | |
| Iodine | 0.1-0.5 mcg | 0.2 | |
| Cobalt | 0.07 | 0.7 | |
| Lithium | 0.5 | 0.5 | |
| Manganese | 55.0-370.0 μg | 10.6 | |
| Copper | 28.0-110.0 μg | 6.9 | |
| Molybdenum | 1.3 | 1.9 | |
| Nickel | 1.0-37.4 μg | 12.8 | |
| Rubidium | 4.0 | 4.0 | |
| Selenium | 0.371 | 0.6 | |
| Strontium | 2.5 | 0.3 | |
| Fluorine | 0.4 | 0.01 | |
| Chromium | 2.3-5.6 μg | 7.9 | |
| Zinc | 61.0-630.0 μg | 2.9 | |
PROTEINS AND AMINO ACIDS
| Name | Content, mass fraction per 100 g of product | % of daily value | |
| in numbers | visually | ||
| Total protein content | 0.40-1.30 g | 1.1 | |
| Essential amino acid content | 0.237 g | 1.1 | |
| Content of replaceable amino acids | 0.280 | 0.5 | |
Essential amino acids
| Name of acid | Content, g per 100 g of product | % of daily requirement | |
| In numbers | Visually | ||
| Valine | 0.042 | 1.7 | |
| Histidine | 0.019 | 0.9 | |
| Isoleucine | 0.027 | 1.4 | |
| Leucine | 0.039 | 0.8 | |
| Lysine | 0.040 | 1 | |
| Methionine | 0.011 | 0.6 | |
| Threonine | 0.022 | 0.9 | |
| Tryptophan | 0.011 | 1.1 | |
| Phenylalanine | 0.026 | 0.9 | |
Non-essential amino acids
| Acid name | Content, g per 100 g of product | % of daily requirement | |
| in numbers | Visually | ||
| Alanine | 0.029 | 0.4 | |
| Arginine | 0.033 | 0.5 | |
| Aspartic acid | 0.046 | 0.4 | |
| Glycine | 0.027 | 0.8 | |
| Glutamic acid | 0.076 | 0.6 | |
| Proline | 0.024 | 0.5 | |
| Serine | 0.027 | 0.3 | |
| Tyrosine | 0.017 | 0.6 | |
| Cystine | 0.001 | 0 | |
FATS AND FATTY ACIDS
| Name | Content, mass fraction per 100 g of product | % of daily allowance | |
| in figures | Visually | ||
| Total fat content | 0.30 | 0.3 | |
| Unsaturated fatty acid content | 0.176 g | 0.4 | |
| Omega-3 unsaturated fatty acid content | 0.039 | 3.9 | |
| Omega-6 unsaturated fatty acid content | 0.121 | 1.2 | |
| Saturated fatty acid content | 0.064 | 0.3 | |
Unsaturated fatty acids
| Acid name | Content, g per 100 g of product |
| Palmitoleic C 16:1 (omega-7) | 0 |
| Oleic C 18:1 (omega-9) | 0. |
| Linoleic C 18:2 (omega-6) | 0.1 |
| Linolenic C 18:3 (omega-3) | 0.039 |
| Stearidonic C 18:4 (omega-3) | 0 |
| Gadoleic C 20:1 (omega-11) | 0 |
| Arachidic C 20:4 (omega-6) | 0 |
| Eicosapentaenoic C 20:5 (omega-3) | 0 |
| Erucic acid C 22:1 (omega-9) | 0 |
| Clupanoid C 22:5 (omega-3) | 0 |
| Docosahexaenoic C 22:6 (omega-3) | 0 |
| Nervonova C 24:1 (omega-9) | 0 |
Saturated fatty acids
| Acid name | Content, g per 100 g of product |
| Capric C 10:0 | 0 |
| Lauric C 12:0 | 0 |
| Myristic acid C 14:0 | 0 |
| Palmitic acid C 16:0 | 0.057 g |
| Stearic acid C 18:0 | 0.007 g |
| Arachidic C 20:0 | 0 |
| Behenic C 22:0 | 0 |
| Lignoceric acid C 24:0 | 0 |
Sterols
| Name | Content, mass fraction per 100 g of product | % of daily requirement | |
| in numbers | Visually | ||
| Total phytosterols | 0.48 | 0.9 | |
| Campesterol | 0.0 mg | 0 | |
| Beta-sitosterol | + | ||
| Stigmasterol | 0.0 | 0 | |
| Daurusterol | + | ||
| Cholesterol | 0 | 0 | – |
CARBOHYDRATES
| Name | Content, mass fraction per 100 g of product | % of daily requirement | |
| in numbers | Visually | ||
| Total carbohydrate content | 3.9-9.2 g | 1.9 | |
| Mono- and disaccharides | 1.6-2.3 g | 3.9 | |
| Glucose | 0.89 | 8.9 | |
| Fructose | 0.75 | 2.1 | |
| Galactose | 0 | 0.0 | |
| Sucrose | 0.1 | – | – |
| Lactose | 0 | 0 | |
| Starch | 0.22 | – | – |
| Maltose | 0 | – | – |
| Fiber | 3.2 | 12.8 | |
| Pectin | 0.7 | 14 | |
PURINE BASES
| Name | Content, mass fraction per 100 g of product | % of daily requirement | |
| in figures | Visually | ||
| Purin content | 2.0 | 1.7 | |
OXALIC ACID
| Name | Content, mass fraction per 100 g of product | % of maximum daily intake | |
| in figures | Visually | ||
| Oxalic acid content | 150.0-530.0 mg | 85.0 |  |