Analysis of characteristic aroma components in famous Mengshan teas Mengding Ganlu and Mengshan Maofeng by GC-MS
Mengding Ganlu produced in Mengshan Mountain of Sichuan Province has been one of the most famous teas and tribute teas in history. Like Mengding Ganlu, Mengshan Maofeng is high-quality green tea produced in Mengshan Mountain area. The processing techniques of these two kinds of tea are typical of gr...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2014-01-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2013.07.011 |
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| Summary: | Mengding Ganlu produced in Mengshan Mountain of Sichuan Province has been one of the most famous teas and tribute teas in history. Like Mengding Ganlu, Mengshan Maofeng is high-quality green tea produced in Mengshan Mountain area. The processing techniques of these two kinds of tea are typical of green tea processing. Historically, these two kinds of tea were produced in Mengquan, Houyan and Longxi villages of Mengshan Mountain, Mingshan County. With the increasing demands of Mengding Ganlu and Mengshan Maofeng, the teas similar to Mengding Ganlu and Mengshan Maofeng produced throughout Ya’an City area are sold as Mengding Ganlu and Mengshan Maofeng nowadays, which infringes the protection of origin place of Mengding Ganlu and Mengshan Maofeng. It is necessary to develop an instrumental technique to identify the authenticity of these two kinds of tea so as to protect consumer rights. Owing to the differences in tea cultivars, environmental conditions and processing methods, chemical compositions of tea show area specific characteristics, among which volatile aroma components are important indicators. The studies on geo-aroma characteristics and brand protection of famous teas such as Westlake Longjing tea, Dongting Biluochun tea and Yunnan Pu-erh tea were reported. However, the study concerning Mengshan teas has not been available so far. The purpose of the present study was set to develop a method to discriminate the volatile aroma compounds of authentic Mengding Ganlu and Mengshan Maofeng produced in the three protected villages including Mengquan, Houyan and Longxi from those produced outside the three protected villages or non-protected areas such as Hejiang.Tea volatile aroma components were collected by simultaneous distillation and extraction (SDE) method using 30.00 g dry tea and 400 mL distilled water, with ethyl decanoate as internal standard, exacted at 45℃ for 1 h. The extracted volatile aroma components were identified by gas chromatography-mass spectrometry (GC-MS), based on the spectral library search (NIST147, NIST27 and WILEY7) and published references. The GC-MS data of the relative contents of aroma components were expressed as the ratio of the peak area to internal standard (ethyl decanoate).The tested results showed that there were 64 peaks detected, among which 63 were identified. The main volatile components of Mengding Ganlu and Mengshan Maofeng were alcohols and aldehydes, which accounted for 59.16%-71.42% of the identified compounds. Furthermore, Mengding Ganlu and Mengshan Maofeng had high concentrations of phytol, geraniol, L-linalool, nonanal and n-heptaldehyde, which could be used to discriminate from famous green teas produced outside the Mengshan Mountains such as Westlake Longjing tea and Dongting Biluochun tea. Mengding Ganlu and Mengshan Maofeng produced in the protected areas had higher concentrations of phytol and nonanal than those from the non-protected areas. These were considered to be related to the unique natural climatic conditions of Mengshan Mountain and their special processing techniques. Phytol and nonanal had floral and fruity flavor. According to the quantitative evaluation of aroma components and tea aroma classification, the aroma types of Mengding Ganlu and Mengshan Maofeng produced in the central zone of the protected areas showed chestnut flavor, the teas produced in the edge areas showed honey and floral flavor, with fresh lily flower scent in the between.It is concluded from this study that Mengding Ganlu and Mengshan Maofeng produced in the protected place of origin have higher concentrations of phytol and nonanal than those from non-protected areas and they can be used to identify the authenticity of Mengding Ganlu and Mengshan Maofeng. |
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| ISSN: | 1008-9209 2097-5155 |