A rare sesquiterpene of hawkteasesquioid A(1),featuring a novel 5/6/5 tricyclic system containing a 6,5-spiroketal motif,was isolated from the bark of Litsea coreana Lévl.var.lanuginosa(hawk tea).The structure of...A rare sesquiterpene of hawkteasesquioid A(1),featuring a novel 5/6/5 tricyclic system containing a 6,5-spiroketal motif,was isolated from the bark of Litsea coreana Lévl.var.lanuginosa(hawk tea).The structure of this compound was elucidated based on the high-resolution electrospray ionization mass spectrometry(HRESIMS),one-dimensional(1D)and two-dimensional(2D)nuclear magnetic resonance(NMR)spectroscopy,and single-crystal X-ray diffraction data.The cytotoxicity of this compound was assessed on the A549,HT-29,and SW1990 cell lines.展开更多
Hawk tea,an herbal tea with unique flavors and health benefits that manufactured from the tender shoots of Litsea coreana var.lanuginose(hawk tea tree),has been consumed for a long time in Southern China.Anthocyanin c...Hawk tea,an herbal tea with unique flavors and health benefits that manufactured from the tender shoots of Litsea coreana var.lanuginose(hawk tea tree),has been consumed for a long time in Southern China.Anthocyanin compounds are a class of water-soluble pigments in plants and have important healthcare benefits.However,the anthocyanin biosynthesis and accumulation in hawk tea are largely unknown.In this study,the hawk tea trees with green(G),green-purple(GP),and purple(P)colored tender shoots were selected for investigation.Their anthocyanin and metabolomic profiling were identified and compared.Results showed that hawk tea trees contained a high abundance of proanthocyanidins and quercetin-3-O-glucoside,and the anthocyanin compounds accumulations in P and GP shoots are higher than in G.The transcriptional network of anthocyanin-mediated purple coloration in hawk tea trees was elucidated by single-molecule real-time(SMRT)sequencing RNA sequencing(RNA-seq)analyses.Moreover,the importance of structural genes and transcription factor genes(TFs),including DFRs,ANS/LODXs,and MYBs,in anthocyanin biosynthesis was revealed.Our study provided a comprehensive understanding of anthocyanin biosynthesis and accumulation in hawk tea trees and a fundamental basis for further development and application of hawk tea products.展开更多
为深度开发应用老鹰茶资源,以四川老鹰茶为原料,研究了老鹰茶粉喷雾干燥工艺条件。在单因素试验的基础上,通过正交试验对喷雾干燥工艺进行优化。结果表明:老鹰茶喷雾干燥较优的工艺条件为进风温度190℃、料液浓度25%、进料流量20 m L/mi...为深度开发应用老鹰茶资源,以四川老鹰茶为原料,研究了老鹰茶粉喷雾干燥工艺条件。在单因素试验的基础上,通过正交试验对喷雾干燥工艺进行优化。结果表明:老鹰茶喷雾干燥较优的工艺条件为进风温度190℃、料液浓度25%、进料流量20 m L/min和出风温度90℃。在此工艺下,喷雾干燥产品得率为29.12%,产品内含成分丰富。展开更多
牛乳经杀菌、冷却和接种等步骤处理后,在42℃发酵7 h使其完全凝乳,按0.2~1 m L/100 m L的比例添加老鹰茶水提浓缩液,并破乳混匀得搅拌型老鹰茶酸奶。搅拌型老鹰茶酸奶在8℃下冷藏5周,考察老鹰茶水提浓缩液对搅拌型酸奶的感官理化品质和...牛乳经杀菌、冷却和接种等步骤处理后,在42℃发酵7 h使其完全凝乳,按0.2~1 m L/100 m L的比例添加老鹰茶水提浓缩液,并破乳混匀得搅拌型老鹰茶酸奶。搅拌型老鹰茶酸奶在8℃下冷藏5周,考察老鹰茶水提浓缩液对搅拌型酸奶的感官理化品质和乳酸菌数的影响。结果表明：搅拌型老鹰茶酸奶具有良好的感官品质,具有老鹰茶特有的色泽和风味,其主要理化指标和乳酸菌总数均符合GB 19302的相关规定。与对照酸奶相比,搅拌型老鹰茶酸奶的茶多酚含量、持水力和粘度均有不同程度增加。老鹰茶水提浓缩液可促进嗜热链球菌的生长,而对鼠李糖乳杆菌、嗜酸乳杆菌、干酪乳杆菌和德氏乳杆菌保加利亚亚种的生长促进作用不明显。展开更多
文摘A rare sesquiterpene of hawkteasesquioid A(1),featuring a novel 5/6/5 tricyclic system containing a 6,5-spiroketal motif,was isolated from the bark of Litsea coreana Lévl.var.lanuginosa(hawk tea).The structure of this compound was elucidated based on the high-resolution electrospray ionization mass spectrometry(HRESIMS),one-dimensional(1D)and two-dimensional(2D)nuclear magnetic resonance(NMR)spectroscopy,and single-crystal X-ray diffraction data.The cytotoxicity of this compound was assessed on the A549,HT-29,and SW1990 cell lines.
基金supported by the Fundamental Research Funds for the Central Universities(SWU-KR22016,SWU-XDJH202316)the Key Project of Chongqing Forestry Bureau(ZDXM2024-2)Chongqing Science and Technology Bureau(cstc2021jscx-gksbX0006).
文摘Hawk tea,an herbal tea with unique flavors and health benefits that manufactured from the tender shoots of Litsea coreana var.lanuginose(hawk tea tree),has been consumed for a long time in Southern China.Anthocyanin compounds are a class of water-soluble pigments in plants and have important healthcare benefits.However,the anthocyanin biosynthesis and accumulation in hawk tea are largely unknown.In this study,the hawk tea trees with green(G),green-purple(GP),and purple(P)colored tender shoots were selected for investigation.Their anthocyanin and metabolomic profiling were identified and compared.Results showed that hawk tea trees contained a high abundance of proanthocyanidins and quercetin-3-O-glucoside,and the anthocyanin compounds accumulations in P and GP shoots are higher than in G.The transcriptional network of anthocyanin-mediated purple coloration in hawk tea trees was elucidated by single-molecule real-time(SMRT)sequencing RNA sequencing(RNA-seq)analyses.Moreover,the importance of structural genes and transcription factor genes(TFs),including DFRs,ANS/LODXs,and MYBs,in anthocyanin biosynthesis was revealed.Our study provided a comprehensive understanding of anthocyanin biosynthesis and accumulation in hawk tea trees and a fundamental basis for further development and application of hawk tea products.
文摘为深度开发应用老鹰茶资源,以四川老鹰茶为原料,研究了老鹰茶粉喷雾干燥工艺条件。在单因素试验的基础上,通过正交试验对喷雾干燥工艺进行优化。结果表明:老鹰茶喷雾干燥较优的工艺条件为进风温度190℃、料液浓度25%、进料流量20 m L/min和出风温度90℃。在此工艺下,喷雾干燥产品得率为29.12%,产品内含成分丰富。
文摘牛乳经杀菌、冷却和接种等步骤处理后,在42℃发酵7 h使其完全凝乳,按0.2~1 m L/100 m L的比例添加老鹰茶水提浓缩液,并破乳混匀得搅拌型老鹰茶酸奶。搅拌型老鹰茶酸奶在8℃下冷藏5周,考察老鹰茶水提浓缩液对搅拌型酸奶的感官理化品质和乳酸菌数的影响。结果表明：搅拌型老鹰茶酸奶具有良好的感官品质,具有老鹰茶特有的色泽和风味,其主要理化指标和乳酸菌总数均符合GB 19302的相关规定。与对照酸奶相比,搅拌型老鹰茶酸奶的茶多酚含量、持水力和粘度均有不同程度增加。老鹰茶水提浓缩液可促进嗜热链球菌的生长,而对鼠李糖乳杆菌、嗜酸乳杆菌、干酪乳杆菌和德氏乳杆菌保加利亚亚种的生长促进作用不明显。
