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Jurnal Penelitian Teh dan Kina
Jurnal Penelitian Teh dan Kina is an national journal providing rapid publication of peer-reviewed articles concerned with tea and cinchona commodities based on the aspects, agronomy, plant breeding, soil science, crop protection, postharvest technology and social economy. Papers dealing with result of original research on the above aspects are welcomed with no page charge.
Articles by issue : Vol 15, No 1 (2012)
4
Articles
Selection of superior assamica tea clones with high yield potential and high catechine contents

Sriyadi, Bambang

Jurnal Penelitian Teh dan Kina Vol 15, No 1 (2012)
Publisher : Research Institute for Tea and Cinchona

Show Abstract | Original Source | Check in Google Scholar | Full PDF (488.507 KB)

Abstract

Selection of superior assamica tea clones with high yielding potential and high catechine contents, was conducted using plant materials of selected mothers bushes from F1 polyclonal seed field with a clone composition of Kiara 8, TRI 777, TRI 2024, TRI 2025, and PS 1. The selected bushes had a minimum 100 g per bush. This research was conducted in Pasir Sarongge Experimental Garden, representing medium elevation and Gambung Experimental Garden, representing high elevation. Experimental design in each location was a randomized complete block design with three replications. Twenty five selected clones were used in this research with one high yielding GMB 7 as a check. Plot contained 15 bushes with plant distant of 120 x 80 cm. Shoot yield were observed in September to November 2010 on six years old plant of third prunning stages with plucking cycle seven days. Catechine content of clone were observed by extracting dry tea shoot in boilling water, followed by deluting in ethyl acetate and HPLC readings. The results showed that in medium elevation clone number of II.32.15 had similar yielding potential with GMB 7 clone with catechine content 16,44%, and at high elevation clones number of II.6.10, III.28.4, III.35.3, and III.36.15 had high yielding potential and catechine content of 15,35%; 16,13%; 16,03%; and 13,14% respectively

The effectiveness of the formulation of Leucaena leucocephala-based botanical fungicides on blister blight disease (Exobasidium vexans Massee) on tea plant

Rayati, Dini Jamia

Jurnal Penelitian Teh dan Kina Vol 15, No 1 (2012)
Publisher : Research Institute for Tea and Cinchona

Show Abstract | Original Source | Check in Google Scholar | Full PDF (593.606 KB)

Abstract

A study to evaluate the effect of the formulation of L. leucocephala-based botanical fungicide against blister blight disease on tea plant has been conducted in laboratory and in field. In laboratory, the effect of formulation of L. leucocephala-based botanical fungicide was tested against spore germination of E. vexans. The experiment was designed in a randomized complete block (RCB) with ten treatments, replicated three times. The treatments comprised: L. leucocephala-based botanical fungicide in WP and EC formulations, each at concentrations of 0,25%; 0,50%; 1,00%; and 1,50%, standard chemical fungicide at the concentrations of 0,03%, and control. In field, effect of formulation of L. leucocephala-based botanical fungicide was tested against blister blight disease intensity. The trial was conducted at Pasir Sarongge Experimental Garden (1.100 m asl), Cianjur, West Java, designed in a randomized complete block (RCB) with six treatments, replicated fourtimes. The treatments comprised: L. leucocephala-based botanical fungicide in WP formulation at the concentrations of 1,0% and 1,5%, as well as  in EC formulation at the concentrations of 0,5% and 1,0%, standard chemical fungicide at the dose of 100 g/ha, and control. Results showed that L. leucocephala-based botanical fungicide was effective in inhibiting spore germination of E. vexans in laboratory at concentration of 1,5% for WP  formulation, and at the concentrations of 0,5%; 1,0%; and 1,5% for EC formulation. Their effectiveness were not significantly different to each others, and lower (21%) than standard chemical fungicide treatment (71%). In field, L. leucocephala-based botanical fungicide in WP formulation at concentration of 1,5% (Dose: 4,5 kg/ha) was effective in suppressing blister blight disease intensity after four times of application, and its effectiveness was comparable to standard chemical fungicide treatment, in average reached 31,29%.

Preservation of fish using instant extract of green and black tea

Nugraha, Tutun, Fernando, Anthony, Rahardjo, Pudjo

Jurnal Penelitian Teh dan Kina Vol 15, No 1 (2012)
Publisher : Research Institute for Tea and Cinchona

Show Abstract | Original Source | Check in Google Scholar | Full PDF (341.791 KB)

Abstract

The use of illegal and hazardous preservative agents such as formalin by traditional fishermen and trader has become a problem in Indonesia.  In this research, instant extract powder of green tea and black tea were used as natural preservatives for fish. Both substances are known for their anti-bacterial and anti-oxidative activities due to the presence of various types of polyphenols, particularly the catechin groups. The tea extract powder was produced  by drying  using a spray drying device. The two different tea extract powders were tested separately, and in combination. The tests were done by dipping pieces of fresh indian mackerel fish (Rastrelliger kanagurta), also known locally as kembung banjar, in the solution containing the tea extract. The microbial tests were done using total plate count (TPC) method. The result showed that instant green and black tea extracts was capable in suppressing bacterial growth in fish. When the two substances were mixed together, the preservation activities were found to be stronger than if they were used separately. In addition, histamine and total volatile base nitrogen (TVB-N) tests which are regularly used to test the freshness of fish also showed substantial improvement in the quality of the fish sample. The sensory tests also showed that the extracts were capable of improving the freshness of the fish sample. 

Antidiabetic activity of of green tea ethanol extract on white mouse

Rohdiana, Dadan, Firmansyah, Adang, Setiawati, Anik, Yunita, Nuni

Jurnal Penelitian Teh dan Kina Vol 15, No 1 (2012)
Publisher : Research Institute for Tea and Cinchona

Show Abstract | Original Source | Check in Google Scholar | Full PDF (288.443 KB)

Abstract

In China, India, United State, and some small other countries, tea has been consumed to prevent various disease, such as diabetes mellitus. A number of recent research revealed that consumption of green tea has an impact on the ability of insulin sensitivity in reducing glucose content in human body. Research to know antidiabetic activity of ethanol extract of green tea on experimental rats has been conducted using glucose tolerance method on rats. Results showed that application of 720 mg/kg BW of ethanol extract of green tea at 120, 180, and 240 minutes after application could reduce glucose content in the body. While applications of 180 mg/kg BW and 360 mg/kg BW of ethanol extract of green tea reduced glucose content of the body at 180 and 240 minutes after application respectively.