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Fatty acid composition of shiitake mushrooms as affected by harvesting cycles
Mun Yhung Jung,Da Eun Lee,Hong Yu Cheng,Min Kyoung Lee,Gyeong Ho Lee,Yoon Young Hwang,Seon Hye Baek 한국버섯학회 2018 버섯 Vol.22 No.1
The fatty acid composition of shiitake mushrooms cultivated at the mushroom farms under the identical condition was analyzed using a GC-FID. The lipids in mushrooms were extracted with a solvent mixture of methanol and chloroform. The lipids were saponified and methylesterified to make fatty acid methylesters (FAME). The FAME was isolated, identified and quantified using a GC-FID with a highly polar cyano-siloxane type capillary column. Linoleic acid was the most abundant fatty acid, representing about 74-81% of total fatty acids. Palmitic acid was the second most abundant fatty acid found in shitake mushrooms. The composition of fatty acid metabolite profiles were not greatly different with harvesting cycles. However, the contents of fatty acids in mushroom was greatly dependent on the harvesting cylcles. The fatty acid of contents in mushrooms obtained at the 1st harvesting cycle was much higher than those in mushrooms obtain at the 3rd harvesting cycle.
Jung, Mun Yhung 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.2
Toxic inorganic arsenic (iAs) has been reported to be present in high quantity in rice and rice-based products. The inorganic arsenic contents in infant foods (n = 59) of ready-to-cook infant rice powders and infant rice snacks marketed in Korea were determined by a highly sensitive gas chromatography-tandem mass spectrometry (GC-MS/MS). The mean iAs contents in the infant rice powder and infant rice snacks were 65.6 and $54.0{\mu}g/kg$, respectively. The percentages of rice powders and rice snack containing iAs over the maximum level ($100{\mu}g/kg$) set by EU for the infant foods were found to be 21, and 6%, respectively. This result clearly suggested that regulation regarding the maximum limit of iAs levels for the baby rice products is urgently needed to be set in Korea. This represents the first report on the iAs levels in ready-to-cook infant rice powder products and infant snacks marketed in Korea.