Naslov
SADRŽAJ BLAGOTVORNIH TVARI U SILIRANOM REHIDRIRANOM ZRNU KUKURUZA
(CONTENT OF BENEFICIAL COMPOUNDS IN ENSILED REHYDRATED MAIZE)

Autori
Kljak, Kristina ; Duvnjak, Marija ; Grbeša, darko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
XXVI MEĐUNARODNO SAVJETOVANJE "KRMIVA". ZBORNIK SAŽETAKA / Modrić, Mario ; Matin, Ana - Zagreb : Krmiva, 2019, 49-50

Skup
26. međunarodno savjetovanje KRMIVA = 26th international conference KRMIVA

Mjesto i datum
Opatija, Hrvatska, 05.06.2019. - 07.06.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
zrno kukuruza, silaža rehidriranog zrna, karotenoidi, tokoli, fenoli
(maize grain, rehydrated grain silage, carotenoids, tocols, phenolics)

Sažetak
Maize grain is the most important energy feed in animal nutrition, and it can be used as a dry or ensiled grain whereas, after rehydration, even dry grain could be ensiled. Maize grain is rich in bioactive compounds from carotenoids, tocols and phenolics, and acidic conditions created during ensiling could affect their content. The aim of this research was to determine contents of these beneficial compounds in rehydrated maize grain silage after 185 days of storage. Grain of hybrids Bc 344, Bc 418b, Bc 424, Bc 525, Bc 572, Kekec and Pajdaš was harvested after physiological maturity, rehydrated to 32% moisture content and ensiled in vacuum bags at room temperature with the addition of a commercial inoculant. Contents of carotenoids (lutein, zeaxanthin, β-cryptoxanthin and β-carotene) and tocols (α-, γ- and δ-tocopherol and γ-tocotrienol) were determined using HPLC method while contents of free and bound phenolics and flavonoids were determined using the spectrophotometric method. Ensiling affected contents of beneficial compounds in rehydrated maize grain silage (P<0.001). Carotenoid content decreased from 8.5 to 28.3% and tocol content from 35.3 to 56.2% while contents of total phenolics and flavonoids increased for 26 and 38%, respectively, in comparison to fresh grain. Also, acidic conditions released a considerable amount of bound resulting in an increase o f free phenolics (66%) and flavonoids (46%). Rehydrated maize grain silages of investigated hybrids varied in contents of beneficial compounds (P<0.001). Ranges for investigated hybrids were (μg/g DM) 9.3 – 20.4 for lutein, 7.9 – 21.3 for zeaxanthin, 1.2 – 4.7 for β-cryptoxanthin, 0.6 – 1.8 for β-carotene, 2.1 – 9.5 for α-tocopherol, 23.1 – 4.8 for γ-tocopherol, 1.1 – 1.7 for δ-tocopherol, 3.0 – 4.5 for γ-tocotrienol, and 3069 – 4506 and 2421 – 3286 GAE/g DM for free and bound phenolics and 460 – 702 and 1384 – 1709 CE/g DM for free and bound flavonoids. Acidic conditions created during ensiling decrease content of carotenoids and tocols and increase content of free and total phenolics and flavonoids.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA