Fresh fruit and vegetable juices are commonly consumed as a valuable source of nutrients, while wheatgrass juice is, due to its nutritional value, used as a natural dietary supplement. The main aim of this research was to evaluate the effect of wheatgrass juice addition to apple, beet, carrot, orange, and lemon juice on total and in vitro bioaccessible concentrations of K, Ca, Mg, Mn, Fe, and Zn, vitamin C concentration, total phenolic and flavonoid content, and antioxidant activity. In comparison to other juices, wheatgrass juice had the highest total and in vitro bioaccessible concentrations of Ca, Mg, Mn, Fe, and Zn, while beet juice had the highest K concentration. Lemon and orange juices had the highest vitamin C concentration, while the highest total phenolic and flavonoid content were found in wheatgrass juice. After the addition of wheatgrass juice, Ca, Mg, Mn, and Zn concentration increased in all examined juices, vitamin C concentration increased in apple, beet, and carrot juice, total phenolic content increased in carrot juice, while total flavonoid content increased in apple, carrot, and orange juice. In comparison to the examined juices, wheatgrass juice has better nutritional value, and it could be used in a mixture with other juices to improve their nutritional value.
Pšenična trava predstavlja biljke pšenice u ranim stadijima uzgoja prije ulaska u fazu vlatanja. Zbog visoke koncentracije minerala, vitamina, enzima, klorofila i bioflavonoida, pšenična trava se koristi kao prirodni dodatak prehrani. Iako se može konzumirati u obliku praha i tableta, često se konzumira u obliku svježega soka, te ju stoga ljudi uzgajaju u kućanstvima. Veliki je problem u takvome uzgoju pojava i razvoj plijesni na supstratu i biljkama. Cilj istraživanja bio je ispitati razlike između površinske dezinfekcije sjemena te vrste i dezinfekcije podloge (bez podloge, kvarcni pijesak [dezinficiran i nedezinficiran] i Brillov supstrat [dezinficiran i nedezinficiran]) na pojavu plijesni, broj i masu biljaka (g) i količinu dobivenoga soka (ml) u dvije sorte pšenice (Ilirija i Katarina). Metode površinske dezinfekcije sjemena i dezinfekcije supstrata, koje su ispitivane u provedenome istraživanju, moguće je primijeniti u kućanstvu. Najveći broj biljaka i masa biljaka utvrđene su na Brill supstratu, neovisno o sorti. Između mase biljaka i količine dobivenoga soka utvrđena je pozitivna korelacija (r=0,98; p<0,01). Prosječna količina soka za sortu Iliriju bila je 7,85±2,93 ml, a za sortu Katarinu 5,08±2,21 ml. Najveća pojava i razvoj plijesni utvrđeni su pri uzgoju pšenične trave bez podloge. Na ispitivane parametre najveći utjecaj imali su sorta i podloga.
Due to its nutritional value, wheatgrass (Triticum aestivum L.) is considered to be a functional food, becoming increasingly popular as a supplement to the people’s quotidian diet. The study aimed to determine the influence of the number of cuttings and cultivars on the total antioxidant activity (DPPH), the content of chloroplast pigments, vitamin C, phenols, and flavonoids in the wheatgrass juice. Two genotypes of wheatgrass, T. aestivum ssp. aestivum (variety Katarina) and T. aestivum ssp. sphaerococcum, respectively, were cut twice during the experiment. In both cuttings, the genotype significantly differed in the flavonoid level and antioxidant activity, while the number of cuttings influenced the content of phenols, vitamin C, and antioxidant activity in the wheatgrass juice. T. sphaerococcum had a higher concentration of flavonoids and a significantly lower antioxidant activity when compared to the Katarina wheat variety. On an average, the first cut implicated an increased content of phenols and vitamin C concerning both genotypes, followed by a higher antioxidant value. In the Katarina variety, a significantly higher phenol content and antioxidant activity was detected in the first cut. In the T. Sphaerococcum, a decrease in the total content of the examined antioxidants was apparent in the second cut.
Hydrogen sulfide (H2S) is involved in many physiological processes and responses to the abiotic types of stress. The aim of the study was to determine the effect of sodium hydrogen sulfide (NaHS) and the time of application on the physiological properties of etiolated wheatgrass plants. Two genotypes of wheatgrass were grown under controlled conditions for five days without light and then with a 12-hour photoperiod, watered for three consecutive days with 100, 200, and 500 mM NaHS solutions. The plants were watered in three variants, 7-9, 10-12, and 13-15 days after sowing, respectively. The highest content of phenols, flavonoids, and hydrogen peroxide was found in wheatgrass plants watered with 100 mM of NaHS solution. The highest proline content and lipid peroxidation levels were found in the plants at 500 mM of NaHS solution. Also, the significant influence of the watering period on the examined physiological parameters was determined. The results show that H2S significantly affects the de-etiolation process and concentration of physiologically active compounds in wheatgrass plants.
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