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Search Results (2)

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Keywords = sea red rice

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24 pages, 4722 KiB  
Article
Extraction Optimization, UHPLC-Triple-TOF-MS/MS Analysis and Antioxidant Activity of Ceramides from Sea Red Rice Bran
by Gang Wang, Xue-Jing Jia, Bing-Bing Song, Rui Li, Xiao-Fei Liu, Jian-Ping Chen, Sai-Yi Zhong and Hong-Kai Zhou
Foods 2022, 11(10), 1399; https://doi.org/10.3390/foods11101399 - 12 May 2022
Cited by 8 | Viewed by 3917
Abstract
As a new type of salt-tolerant rice, sea red rice contains more minerals, proteins, and lipid compounds, and, in particular, its by-product rice bran may be used to replace other commercial rice brans as the main source of ceramides (Cers). However, the extraction [...] Read more.
As a new type of salt-tolerant rice, sea red rice contains more minerals, proteins, and lipid compounds, and, in particular, its by-product rice bran may be used to replace other commercial rice brans as the main source of ceramides (Cers). However, the extraction rate of Cers is generally low, and it is crucial to seek an efficient extraction method. This study optimized the ultrasonic-assisted extraction of Cers from sea red rice bran using response surface methodology (RSM) and obtained a Cers yield of 12.54% under optimal conditions involving an extraction temperature of 46 °C, an extraction time of 46 min, and a material–to-liquid ratio of 5 g/mL. The Cers content in sea red rice bran was preliminarily analyzed using thin-layer chromatography, and the Cers content was determined via UHPLC-Triple-TOF-MS/MS after purification and separation using silica column chromatography. Forty-six different types of Cers were identified in sea red rice bran, of which Cer 18:0/24:0 (2OH), Cer 18:0/26:0, Cer 18:0/26:0 (2OH), and Cer 18:0/24:0 accounted for 23.66%, 17.54%, 14.91%, and 11.96%. Most of the Cers structures were mainly composed of sphingadienine. A biological activity assay indicated that Cers extracted from sea red rice bran had significant antioxidant and anti-aging properties. These findings indicate that the extracted Cers show great potential for applications in the cosmetic and pharmaceutical industries. Full article
(This article belongs to the Special Issue Analysis, Detection Technology and Safety Risk Assessment of Food Contaminants)
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10 pages, 709 KiB  
Article
Azaphilones from the Red Sea Fungus Aspergillus falconensis
by Dina H. El-Kashef, Fadia S. Youssef, Rudolf Hartmann, Tim-Oliver Knedel, Christoph Janiak, Wenhan Lin, Irene Reimche, Nicole Teusch, Zhen Liu and Peter Proksch
Mar. Drugs 2020, 18(4), 204; https://doi.org/10.3390/md18040204 - 10 Apr 2020
Cited by 28 | Viewed by 4606
Abstract
The marine-derived fungus Aspergillus falconensis, isolated from sediment collected from the Canyon at Dahab, Red Sea, yielded two new chlorinated azaphilones, falconensins O and P (1 and 2) in addition to four known azaphilone derivatives (3−6) [...] Read more.
The marine-derived fungus Aspergillus falconensis, isolated from sediment collected from the Canyon at Dahab, Red Sea, yielded two new chlorinated azaphilones, falconensins O and P (1 and 2) in addition to four known azaphilone derivatives (3−6) following fermentation of the fungus on solid rice medium containing 3.5% NaCl. Replacing NaCl with 3.5% NaBr induced accumulation of three additional new azaphilones, falconensins Q−S (7−9) including two brominated derivatives (7 and 8) together with three known analogues (10−12). The structures of the new compounds were elucidated by 1D and 2D NMR spectroscopy and HRESIMS data as well as by comparison with the literature. The absolute configuration of the azaphilone derivatives was established based on single-crystal X-ray diffraction analysis of 5, comparison of NMR data and optical rotations as well as on biogenetic considerations. Compounds 1, 3−9, and 11 showed NF-κB inhibitory activity against the triple negative breast cancer cell line MDA-MB-231 with IC50 values ranging from 11.9 to 72.0 µM. Full article
(This article belongs to the Special Issue Bioactive Natural Products from the Red Sea)
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