scholarly journals Changes of phenolic compounds of tea leaves during Oolong tea process

2014 ◽  
Vol 17 (1) ◽  
pp. 67-75
Author(s):  
Tram Ngoc Nguyen ◽  
Oanh Ngoc Huynh ◽  
Hien Phuoc Phan
Keyword(s):  
Phenolic Compounds ◽  
Green Tea ◽  
The Other ◽  
Tea Leaves ◽  
Total Polyphenols ◽  
Oolong Tea ◽  
Other Hand ◽  
Green Tea Leaves

It was believed that provided photographs of changes of total polyphenols (TPP), tannin, theaflavins (TF), thearubigins (TR) contents and total colour liquids. Green tea leaves were going through the stages: fresh tea → withering → incubated 1 → aromatic spin 1 → incubated 2 → aromatic spin 2 →fried inactivated enzymes. Tea samples in the stages were provided by Cau Tre tea factory. Tea samples were divided into two groups: the activated and inactivated enzyme groups – microwave was applied to treated the activated enzyme one. Tea samples after the inactivation were conducted. The results showed that TPP and tannin contents generally decreased. Changes of theaflavin contents were contrast to tannin contents. On the other hand, theaflavin and thearubigin are the major polyphenols that determine on the quality of Oolong tea.

scholarly journals Key Elements of Technology Package Influencing Annual Tea Production of Small Tea Growers (STGS): Insight from Biswanath District of India

2019 ◽  
Vol 8 (4) ◽  
pp. 9799-9802
Keyword(s):  
Water Supply ◽  
Green Tea ◽  
Small Scale ◽  
Tea Leaves ◽  
Tea Plantation ◽  
Environment And Health ◽  
Green Tea Leaves ◽  
Tea Production ◽  
Artificial Water

Though the tea sector of Assam is primarily dominated by the estate sector comprising of large tea gardens, the relevance of small scale tea plantation can never be denied as nearly 30% of the state’s tea production is contributed by Small Tea Growers (STGs). In fact the quality of green tea leaves produced by the Small Tea Growers (STGs) has outclassed that of the tea leaves produced by the estate sector. Since tea plantation is a technology intensive practice, the growers are bound to adopt certain technology components like artificial fertiliser, artificial pesticide, HYV clone, artificial water supply facility, etc. All these elements constitute a technology package which helps the tea growers to reap greater benefit in tea cultivation. This study is a humble attempt to investigate the marginal impact of each element of the technology package adopted by the Small Tea Growers (STGs) on their annual green tea leave production. Moreover it also tries to figure out the jeopardised effect of the technology package used in tea cultivation on environment and health.

scholarly journals Effect of early leaf removal on Sangiovese (Vitis vinifera L.) under thermal excess and drought conditions

2019 ◽  
Vol 13 ◽  
pp. 04005
Author(s):  
Sergio Puccioni ◽  
Giordano Martini ◽  
Alessandra Zombardo ◽  
Rita Perria ◽  
Mario Pagano ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Vitis Vinifera ◽  
Pest Control ◽  
The Other ◽  
Vitis Vinifera L ◽  
Leaf Removal ◽  
Other Hand ◽  
Drought Conditions ◽  
Warm Summer

The early defoliation of the fruiting area is a technique that offers considerable advantages both in relation to the quality of grapes and to pest control; on the other hand, when a very warm summer occurs, the risk of grape sunburn may increase. This paper reports the results of a pre-flowering defoliation trial carried out in the province of Arezzo (Italy) in 2017, an exceptionally hot and dry year. The results confirmed the validity of this technique in limiting yield while achieving a concurrent higher concentration of phenolic compounds without increasing the risk of burns and radiative damages of grapes.

scholarly journals Nitrogen Fertilization in Soil Affects Physiological Characteristics and Quality of Green Tea Leaves

HortScience ◽  
2018 ◽  
Vol 53 (5) ◽  
pp. 715-722 ◽  
Author(s):  
Fang Xiao ◽  
Zaiqiang Yang ◽  
Haijing Huang ◽  
Fei Yang ◽  
Liyun Zhu ◽  
...  
Keyword(s):  
Green Tea ◽  
N Fertilization ◽  
Shoot Biomass ◽  
Tea Leaves ◽  
Total N ◽  
Spad Value ◽  
Green Tea Leaves ◽  
Fertilization Level ◽  
Growth Quality

To study the effects of soil nitrogen (N) fertilization on tea growth, quality and yield, a controlled experiment with green tea [Camellia sinensis (L.) O. Ktze] was conducted. Five N fertilization treatments in soil were designed: 0, 0.97, 1.94, 3.88, and 5.82 g/kg/pot, which were subsequently recorded as N0, N1, N2, N3, and N4. The changes to young shoot biomass, total N and carbon (C), Soil and Plant Analyzer Development (SPAD) value, photosynthetic parameters, senescent characteristics, endogenous hormones, and the quality of green tea leaves were investigated. The results showed that with the increase in N fertilization level, the young shoot biomass, total N and C, SPAD value, net photosynthetic rate (PN), transpiration rate (Tr), stomatal conductance (gS), superoxide dismutase activity, indoleacetic acid, gibberellin, zeatin (ZT), caffeine, and amino acids increased at first and then decreased, the maximums appeared at 3.88 g/kg/pot; whereas the intercellular CO2 concentration (Ci), malondialdehvde contents, abscisic acid (ABA), polyphenol contents, and the ratio of polyphenols (PP) to free amino acid decreased at first and then increased, the minimums appeared at 3.88 g/kg/pot. The immediately significant change in all parameters appeared after 1 month of N treatments. The experiment showed that 3.88 g/kg/pot N fertilization level was the best for growth, quality, and yield of tea, which could provide a theoretical basis for short-term N fertilization management in tea tree.

Concentrations of alkali elements in green tea leaves evaluated using PIXE analysis

2014 ◽  
Vol 24 (01n02) ◽  
pp. 35-39
Author(s):  
A. Terakawa ◽  
K. Ishii ◽  
S. Matsuyama ◽  
T. Matsuyama ◽  
T. Sato ◽  
...  
Keyword(s):  
Green Tea ◽  
Internal Standard ◽  
The Other ◽  
Radioactive Cesium ◽  
Internal Standard Method ◽  
Tea Leaves ◽  
Pixe Analysis ◽  
Green Tea Leaves ◽  
Tea Leaf ◽  
Alkali Elements

The concentrations of alkali elements in Japanese green tea leaves were evaluated using particle-induced X-ray emission (PIXE) analysis combined with an internal standard method to investigate the elution of radioactive cesium into green tea using potassium and rubidium. The concentrations of potassium and rubidium of used tea leaf samples were lower than those of unused samples, whereas no significant differences in the concentrations of the other elements were observed between them. In addition, we found a similarity in the relative concentrations between potassium and rubidium although the other elements showed different aspects. These results suggest that it is possible to investigate the elution of radioactive cesium into green tea using potassium and rubidium as substitutes of cesium.

EFEK PENAMBAHAN EKSTRAK AIR JAHE (Zingiber officinale Roscoe) DAN PENYIMPANAN DINGIN TERHADAP MUTU SENSORI IKAN TUNA (Thunnus albacores)

2010 ◽  
Vol 6 (1) ◽  
pp. 36
Author(s):  
Silvana Dinaintang Harikedua
Keyword(s):  
Sensory Quality ◽  
Zingiber Officinale ◽  
The Other ◽  
Ginger Extract ◽  
Other Hand ◽  
Storage Treatment ◽  
Zingiber Officinale Roscoe ◽  
Hedonic Scale ◽  
And Storage

The objective of this study was to investigate the effect of ginger extract addition and refrigerate storage on sensory quality of Tuna through panelist’s perception. Panelists (n=30) evaluated samples for overall appearance and flavor attribute using hedonic scale 1–7. The sample which is more acceptable by panelists on flavor attributes having 3% gingers extract and storage for 3 days. The less acceptable sample on flavor attribute having 0% ginger extract and storage for 9 days. On the other hand, the sample which is more acceptable by panelists on overall appearance having 0% ginger extract without storage treatment. The less acceptable sample on overall appearance having 3% ginger extract and storage for 9 days.

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