Lipidomics analysis unravels changes from flavor precursors in different processing treatments of purple-leaf tea.

BACKGROUND: Lipids are one of the most important bioactive compounds, affecting the character and quality of tea. However, the contribution of lipids to tea productions is still elusive. Here, we systematically identified the lipid profiles of green, oolong, and black teas in purple-leaf tea (Jinmingzao, JMZ) and green-leaf tea (Huangdan, HD), respectively. RESULTS: The lipids analysis showed regular accumulation in tea products with different manufacturing processes, among which the fatty acids, glycerolipids, glycerophospholipids, and sphingolipids contribute to the quality characteristics of tea products, including typical fatty acyl (FA), monogalactosyldiacylglycerol (MGDG), digalactosyldiacylglycerols (DGDG), and phosphatidylcholine (PC). Compared tea materials with products, levels of fatty acids were up-regulated, while glycerolipids and glycerophospholipids were down-regulated in tea products. FA 18:3, FA 16:0, MGDG 36:6, DGDG 36:6, PC 34:3, and PC 36:6 were the negative contributors to green tea flavor formation of purple-leaf tea. The pathway analysis of significant lipids in materials and products of purple-leaf tea were enriched linolenic acid metabolism pathway and glycerolipid metabolism. CONCLUSION: This study provides insights into the lipid metabolism profiles of different tea leaf colors, and found that fatty acids are essential precursors of black tea flavor formation. © 2021 Society of Chemical Industry.

[Effect of levonorgestrel-releasing intrauterine system in the treatment of adenomyosis].

OBJECTIVE: To assess the clinical efficacy of levonorgestrel-releasing intrauterine system (LNG-IUS) in the treatment of adenomyosis. METHODS: Forty-two patients with adenomyosis diagnosed by clinical symptoms, MRI, laparoscopy and/or chromatic colour type-B ultrasound were treated with LNG-IUS, and the menstrual blood volume, severity of dysmenorrhea and uterine volume were observed three months later. RESULTS: After 3 month treatment of LNG-IUS, the menstrual blood volume reduced significantly to (27 +/- 11)% of that before treatment. The uterine volume was decreased from (143 +/- 33) cm(3) to (115 +/- 22) cm(3) (P < 0.05). Dysmenorrhea was completely relieved or significantly alleviated. Hemoglobin recovered to (124 +/- 8) g/L (P < 0.05) in 20 patients with anemia. CONCLUSION: LNG-IUS is an effective and safe method in the short-term treatment of adenomyosis.