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Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective]Four different colors of white, yellow, pink and purple Nymphaea hybrid were used as tested materials and the varieties and contents of volatile substances were detected, and to explore the differences of volatile substances and the characteristic aroma components in different varieties.[Method]The volatile components in N. hybrid were analyzed by headspace solid-phase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GCMS), and the relative content of each component was calculated by internal standard method. The odor activity value (OAV) of each substance was calculated based on the content and sensory thresholds, to analyze the contribution of each component to the aroma of N. hybrid.[Result] A total of 127 volatile components were detected in four different varieties of N. hybrid, including alkanes, ketones, alcohols, aldehydes, esters, acids, terpenoids and others. Among these, 45 compounds contributed to aroma. The volatile components with relatively high content included pentadecane, 6,9-Heptadecadiene, benzyl alcohol, benzyl acetate, trans-α-Bergamotene, trans-β-Famesene, γ-bisabolene, β-Ionone, and 2-butanone-β-Ionone. The odor activity values of volatile aroma components were analyzed, and the main aroma components with OAV larger than 1 included famesene, β-sesquihydrocelercene, bergamotene, benzyl acetate, anisylacetate α-ionol, β-ionone, 2-butanone-β-ionone, bisabolene, ethyl benzoate. These substances had six aromatic attributes, including orange, floral, delicate, herbal, sweet and woody fragrance, in which floral and woody were the main fragrance of N. hybrid.[Conclusion]The aroma substances contributing more to the aroma of different varieties of N. hybrid are clarified. The aroma of the white variety is characterized by floral aroma with strong violet fragrance, herbal and woody aromas. The aroma of the yellow variety is characterized by lilac/jasmine-like floral, woody and oily fragrance. The aroma of the pink variety is characterized by osmanthus or seaweed-like floral, herbal and woody fragrance. The aroma of the purple variety is characterized by woody, orange, floral, fruity, herbal, sweet, and balsamic aromas. [ABSTRACT FROM AUTHOR]

Copyright of Acta Agronomica Sinica is the property of Crop Science Society of China and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Food Research & Development is the property of Food Research & Development Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The digital speckle correlation method was adopted to measure the deformation field.Acoustic emission information was monitored by acoustic emission system.This paper concentrated on acoustic emission characteristics of deformation field evolution of red sandstone rocks.By uniaxial compression,the deformation filed evolution,the correspondence between deformation filed evolution and acoustic emission dominant-frequency range and acoustic emission event rate,energy characteristics of acoustic emission dominant-frequency of red sandstone were studied.The results show that:At the start time of deformation localization,the low dominant-frequency acoustic emission events began to occur,then the number increased.The dominant-frequency distribution of acoustic emission events increased with the increase of dislocation rate.The quantity of low and higher dominant-frequency acoustic emission event rate are close,but the quantity is small.When the macroscopic crack developed of rock specimen,the low dominant-frequency event rate is larger.And the higher dominant-frequency event rate is smaller.At the peak of stress,the low dominant-frequency event rate is much higher than the high dominant-frequency event rate.The value of high and low dominant-frequency acoustic emission event rate is higher at the interface sliding stage.In the process of failure of rock specimens,the high energy acoustic emission events are mainly distributed in the low dominant-frequency range.Low energy acoustic emission events are distributed both in high dominant-frequency and low dominant-frequency range. [ABSTRACT FROM AUTHOR]