Optimized combination of dilution and refined QuEChERS to overcome matrix effects of six types of tea for determination eight neonicotinoid insecticides by ultra performance liquid chromatography–electrospray tandem mass spectrometry
In this study, sample preparation by a refined QuEChERS method combined with a dilution strategy removed almost all matrix effects caused by six types of tea. Tea samples were soaked with water and extracted with acetonitrile, cleaned up with a combination of PVPP (160mg) and GCB (20mg), and dried. Dried extracts were diluted with 20mL acetonitrile/water (15:85, v/v) before analysis by UPLC–MS/MS. The average recoveries of eight neonicotinoid insecticides (dinotefuran, nitenpyram, thiamethoxam, imidacloprid, clothianidin, imidaclothiz, acetamiprid, and thiacloprid) ranged from 66.3 to 108.0% from tea samples spiked at 0....
Source: Food Chemistry - April 27, 2016 Category: Food Science Source Type: research
Sensors, Vol. 16, Pages 594: A Comparative Analysis of Machine Learning with WorldView-2 Pan-Sharpened Imagery for Tea Crop Mapping
This study attempts to interpret tea land use/land cover (LULC) using very high resolution WorldView-2 imagery of central Taiwan with both pixel and object-based approaches. A total of 80 variables derived from each WorldView-2 band with pan-sharpening, standardization, principal components and gray level co-occurrence matrix (GLCM) texture indices transformation, were set as the input variables. For pixel-based image analysis (PBIA), 34 variables were selected, including seven principal components, 21 GLCM texture indices and six original WorldView-2 bands. Results showed that support vector machine (SVM) had the highest ...
Source: Sensors - April 25, 2016 Category: Biotechnology Authors: Yung-Chung ChuangYi-Shiang Shiu Tags: Article Source Type: research
Effect of shaking process on correlations between catechins and volatiles in oolong tea
Publication date: Available online 12 April 2016 Source:Journal of Food and Drug Analysis Author(s): Shu-Yen Lin, Li-Chiao Lo, Iou-Zen Chen, Po-An Chen Shaking the tea leaves is the key manipulation to making oolong tea. It contributes to the formation of flavor and fragrance in oolong tea. The dynamic variations of catechins and volatile organic compounds (VOCs) during the shaking process were investigated. The results showed that the contents of epicatechin, epigallocatechin, epicatechin gallate (ECG), and epigallocatechin gallate first decreased after the shaking and then increased to the initial value befor...
Source: Journal of Food and Drug Analysis - April 22, 2016 Category: Food Science Source Type: research
Use of plant extracts for tea pest management in India.
Abstract
India is the second largest producer of black tea in the world. The biggest challenge for tea growers of India nowadays is to combat pests and diseases. Tea crop in India is infested by not less than 720 insect and mite species. At least four sucking pests and six chewing pests have well established themselves as regular pests causing substantial damage to this foliage crop. Various synthetic pesticides are widely used for the management of tea pests in India. Applications of such large quantity of pesticides could cause various problems such as development of resistance, deleterious effects on no...
Source: Applied Microbiology and Biotechnology - April 21, 2016 Category: Microbiology Authors: Roy S, Handique G, Muraleedharan N, Dashora K, Roy SM, Mukhopadhyay A, Babu A Tags: Appl Microbiol Biotechnol Source Type: research
488 Anti-inflammAgeing effect of green tea petiole extract in vitro and in vivo
In this study, we investigated the anti-inflammatory effect of GTP extract in human skin cells and 3D skin equivalent. Thus far it has been reported that abnormal TLRs and/or TLR-ligands signaling could lead to inflammation imbalance during cellular aging named inflamm-aging. (Source: Journal of Investigative Dermatology)
Source: Journal of Investigative Dermatology - April 20, 2016 Category: Dermatology Authors: H. Lee, I. Bae, S. Lee, D. Min, M. Kim, N. Park, J. Lee, Y. Kim Tags: Innate Immunity, Inflammation & Microbiology Source Type: research
