Buckwheat: classification, quality and applications

Buckwheat (Fagopyrum) is a genus of herbaceous plants in the Polygonaceae family, whose grain is one of the most important groat and dietary crops in the world. It is a unique plant often called a "pseudo-cereal" because, despite being used as a grain crop, it does not belong to the grass family. Buckwheat is distinguished by its exceptional nutritional value, rich biochemical composition and ability to grow on poor soils, making it a strategically important crop for food security and dietary nutrition.

Chemical Nature and Grain Composition

Buckwheat grain has a triangular shape and is covered with a dense hull, the share of which ranges from 18 to 30% depending on the variety and growing conditions. The chemical composition of the grain is determined by a high content of starch (65–75%), quality protein (13–14%), dietary fibre and a unique set of micronutrients. A key feature of buckwheat is the presence of the flavonoid rutin (quercetin-3-rutinoside), the content of which in the grain can reach 6.7–14.1 × 10⁻² g/kg, and in Tartary buckwheat (Fagopyrum tataricum) — up to 0.8–1.7% dry weight. Rutin has pronounced antioxidant, antihypertensive and antihyperglycemic properties.

Buckwheat proteins have a balanced amino acid composition and, most importantly, an almost complete absence of prolamins (gluten), which allows it to be classified as a gluten-free crop and recommended for the dietary nutrition of patients with celiac disease. Buckwheat is also rich in B vitamins (thiamine, riboflavin, pyridoxine), vitamin E, potassium, phosphorus, magnesium, iron and zinc.

Classification, Classes and Standards

In Russia and CIS countries, buckwheat quality is regulated by GOST 19092-2021 "Buckwheat. Specifications". According to the standard, depending on grain quality, buckwheat is divided into three classes. The class is determined by the worst value of one of the standardised indicators: if the grain does not meet the norm for at least one criterion, it is assigned to a lower class.

Key quality indicators for class 1: kernel content — not less than 73%, moisture — not more than 14.5%, foreign matter — not more than 2.0%, grain impurities — not more than 2.0%, acidity — not more than 4.0 degrees. For class 2, kernel content is not less than 71%, for class 3 — not less than 70%. In buckwheat for the production of baby food, the presence of sprouted grains is not allowed.

For wholegrain buckwheat supplied for food purposes, including baby food, GOST 31454-2012 applies, which establishes requirements for wholeness (not less than 60–75% for the highest class), impurity content (not more than 2–4%) and functional properties, including falling number (not less than 200–250 s). For buckwheat groats, GOST 5550-74 applies, standardising sound kernels (not less than 98.4–99.2%), moisture, content of unhulled grains and damaged kernels.

Production and Processing Technology

Buckwheat cultivation includes soil preparation, sowing, care and harvesting. Buckwheat is demanding of warmth and moisture, especially during flowering, and does not tolerate drought well. After harvesting, the grain is cleaned, dried and sorted. The main processing directions are:

• Groats production: production of buckwheat groats (whole kernel and crushed kernel) and Smolensk groats (finely crushed grain).

• Flour milling: buckwheat flour is used for baking pancakes, bread, pasta and baby food.

• Deep processing: production of flakes, gluten-free pasta, crispbreads and dietary products with high added value.

• Feed production: processing waste (husks, flour dust) is used as feed and raw material for biofuel production.

Modern technologies are aimed at developing deep processing of buckwheat, allowing products with profitability from 30 to 150% to be obtained.

Applications

Food consumption. The main use of buckwheat is the production of groats and flour, which form the basis of dietary and functional nutrition. Buckwheat groats are valued for their high content of protein, dietary fibre, rutin and absence of gluten.

Dietary and therapeutic nutrition. Due to its gluten-free nature, buckwheat is used in the nutrition of people with celiac disease and in baby food. Rutin and other bioactive compounds give products antioxidant and antihyperglycemic properties.

Feed production. Buckwheat and its processing products are used as feed for farm animals and poultry.

Cosmetics and pharmaceuticals. Buckwheat extracts rich in rutin and flavonoids are used in the production of cosmetics and dietary supplements.

Safety and Storage

Buckwheat is a combustible material, but the main risk during storage is associated with biological processes. Grain is hygroscopic: at moisture above 14.5%, respiration, mould growth and mycotoxin accumulation are activated. Storage is carried out in dry, well-ventilated grain stores (elevators, flat stores) at controlled temperature and humidity. Regular monitoring of pest infestation (granary weevil, mites) and active ventilation must be ensured. When working with grain dust, respirators are recommended.

Market and Trends

The global buckwheat market is characterised by steady demand supported by the trend towards healthy eating and gluten-free products. Global buckwheat consumption reached 2.9 million tonnes in 2024, with Russia and China being the largest consumers and producers. Russia accounts for about 45% of global buckwheat production, significantly ahead of China. The global market is projected to reach 3.1 million tonnes by 2035 at a compound annual growth rate of about 1.1%.

In Russia, the buckwheat harvest in 2025 amounted to about 926 thousand tonnes, but in 2026 a decline to 794 thousand tonnes is expected due to a reduction in sown areas (708 thousand hectares versus 751 thousand hectares) and drought conditions in key regions. Despite this, Russia remains a key exporter: in January–February 2026, buckwheat supplies to China increased by a third in value terms (to USD 14.3 million) and by 17% in physical terms (to 45 thousand tonnes).

Key industry trends include growing demand for gluten-free and functional products, the development of deep processing of buckwheat (flakes, flour, pasta), and the expansion of exports to China and the Asia-Pacific region. Producers with access to quality grain and modern deep-processing capacities occupy stable competitive positions.

Conclusion

Buckwheat remains a unique and strategically important crop of global agriculture and the food industry. Understanding the classification according to GOST 19092-2021, key quality indicators (kernel content, moisture, acidity, falling number), gluten-free properties and processing directions is the basis for competent selection of grain for specific purposes — from groats production to dietary and functional nutrition. Organising buckwheat supplies, including the selection of classes and quality control, requires an individual approach.