Accumulation stability of flavonoids as a species characteristic Lamiaceae family

The aim. The work evaluates 14 economically significant species from the Lamiaceae family. The aim of the work is a comparative assessment of the species from Lamiaceae family by the stability of the composition of raw materials depending on the year weather conditions, which will allow predicting the raw materials quality for its use and processing. Methods. The focus of the work is on determining the yield and flavonoid content. The yield was determined in 4-fold repetition; the size of the plot was 0.66 m2 (1 linear meter with 60 cm row spacing). The sum of flavonoids was been determined by the spectrophotometric method («Shimadsu» spectrophotometer). Results. The optimal harvesting period for the study-selected species is the beginning of mass flowering, which in the Moscow region falls on the last ten days of June – the first ten days of July. The maximum yield on average over 4 years was in Monarda fistulosa (350±42 g/m2), Nepeta grandiflora (363±40 g/m2) and Dracocephalum moldavica (440±76 g/m2). Based on the average four-year values, the maximum flavonoid content was noted in peppermint raw materials (3.52%), and in 2017 and 2018 it exceeded 4%. The flavonoid content was 1% and slightly more lower in Salvia officinalis (2.62%), Thymus serpyllum (2.44%), and Origanum vulgare (2.59%). The species 7 of the 14 studied had average values within 2-3%. Conclusion. Flavonoid accumulation in plants of the Lamiaceae family is species-specific and varies greatly from year to year. Only Agastache foeniculum has a stable flavonoid content, as indicated by a variation coefficient below 10%. Dracocephalum moldavica, Monarda fistulosa, Thymus vulgaris, Thymus serpyllum, Origanum vulgare, and Satureja hortensis were been characterized by an average variation coefficient.