The goal of this paper is to demonstrate a potential of energetic value of seeds of oil plants collected in the M.M. Gryshko National Botanical Garden of the NAS of Ukraine. In the present study lipid and caloric content of cultivars and varieties of Brassica campestris D.C., Brassica junceae (L.) Czern., Brassica napus D.C., Brassica rapa subsp. rapifera Metzger, Camelina sativa (L.) Crantz and Sinapis alba L. are described. Studing of seeds of 19 samples of investigated plants was carried out by method of extraction with petroleum ether equipped with Soxhlet extractor. Content of lipids was determined in range from 17.72% (Brassica campestris f. annua D.C., cv. Pioner) to 37.61% (Brassica napus f. annua D.C., cv.s. Yamal). Comparing of Brassica campestris plants showed that winter varieties had higher level of lipids in seeds and was in range from 28.35 to 34.48%. In the spring varieties the same parameter was in range from 17.72 to 29.00%. Identification of energetic value was made by method of combustion in the oxygen and was determined in range from 5,039.33 Kcal/kg (Brassica campestris f. annua) to 6,108.00 Kcal/kg (Brassica napus f. annua D.C., cv.s. Yamal). Content of calories in the seeds of winter varieties of Brassica campestris was from 5,530.40 to 6,045.67 Kcal/kg and in spring varieties -from 5,381.33 to 5,659.11 Kcal/kg.

Investigation of accumulation of different compounds in above-ground part of these plants an important aspect for evaluation of perspective of use. The aim of this study was to compare the peculiarities of the biochemical composition of Crambe species dynamically. Plant material collected from the experimental collection of M.M. Gryshko National Botanical Garden of the NAS of Ukraine. It was studied above-ground parts of C. cordifolia Steven, C. koktebelica (Junge) N. Busch, C. maritima L., C. steveniana Rupr. At the spring vegetation, budding stage, flowering, and fruitage. Following biochemical parameters was studied: dry matter by drying to consist weight at the 105 °C; content of sugars by Bertrand's method using of glucose scale; ascorbic acids with 2.6-dichlorophenolindophenol, tannins with indigo carmine discoloration, organic acids by sodium hydroxide titration with phenolphthalein; carotene with gasoline galosh spectrophotometrically; ash in muffle over. The dry matter during vegetation was from 9.76 (C. cordifolia, budding) to 22.54 (C. maritima at the fruitage) %, total content of sugars from 6.54 (C. maritime at the fruitage) to 33.18 (C. cordifolia at the budding) %, ascorbic acid from 139.85 (C. maritima at the spring vegetation) to 987.02 (C. maritime at the budding) mg%, b-carotene from 0.39 (C. maritima at the budding) to 1.82 (C. cordifolia at the fruitage) mg%, tannins from 1.28 (C. cordifolia at the fruitage) to 7.47 (C. steveniana at the budding) %, content of organic acids from 3.12 (C. steveniana at the fruitage) to 6.28 (C. koktebelica at the spring vegetation) %, ash from 6.11 (C. maritima at the spring vegetation) to 14.61 (C. cordifolia at the flowering) %. Correlation analysis showed that between the content of tannins and organic acids existed positive moderate correlation (r = 0.52). Between other parameters found the weak, very weak positive or negative correlation. Thus, comparing biochemical analyze identified that raw of four species of Crambe is a valuable source of nutrients during vegetation. The high content of sugars, ascorbic acid, and carotene can recommend these plants as forage crops. Also, raw of these plants can be recommended for farther pharmacological investigations.

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The economically important species of genus Brassica L. were investigated in this study. Alcohol and water plant extracts of cultivars and varieties of Brassica campestris and B. rapa were inspected on antiradical activity by DPPH-method (with 2,2-diphenyl-2-picrylhydrazyl). Obtained extracts were measured on a spectrophotometer at wavelength 515 nm. Antiradical activity of methanol extracts was in the range from 34.29 (B. rapa subsp. rapifera Metzger (f. biennis), f. EOTRFO) to 58.09% (B. campestris f. biennis D.C., cv. Oriana). Water extracts demonstrated this activity in range from 58.18 (B. campestris f. biennis D.C., cv. Oriana) to 84.25% (B. campestris f. biennis D.C. × B. rapa L., f. EOTFVS). Antioxidant activity (AA) of extracts of investigated plants was expressed in ascorbic acid equivalent (mg g -1 AAE). The highest AA of methanol extracts was found for B. campestris f. biennis D.C. × B. rapa L., cv. Fitopal (86.07 mg g -1 AAE), the lowest one -for B. rapa subsp. rapifera Metzger (f. biennis), f. EOTRFO (52.78 mg g -1 AAE). Maximal AA of water extracts was registered for B. campestris f. biennis D.C. × B. napus f. biennis D.C., cv. Innovacia (121.77 mg g -1 AAE), minimal -for B. campestris f. biennis D.C. × B. rapa L., f. EOTFVS (85.18 mg g -1 AAE).