Identification of odorous compounds from nine fermentor-cultivated Streptomyces strains

Řezanka, Tomáš; Prell, A.; Sigler, Karel

doi:10.1007/s12223-008-0049-3

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Geosmin is a well-known microbial metabolite produced by several species of cyanobacteria, streptomycetes and some fungi, − which is responsible for the characteristic smell of moist soil or freshly plowed earth and is mainly found in soil, but also in odor-polluted water, wheat grain, beets, apple juice, cheese, nut, cabbage, fish or wine. ,,− It presents with an undesirable musty or earthy odor even at very low concentration owing to an exceptionally low threshold for human detection (less than 10 ng/L). To study its influence on the aroma of Chinese liquor, we investigated the olfactory perception threshold of geosmin in solution with high level alcohol content according to the mentioned method in Materials and Methods.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Geosmin as Source of Earthy Odor in Different Aroma Type Chinese Liquors

Fan

2011

J. Agric. Food Chem.

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Earthy odor is one of the most frequent and serious causes for the aroma deterioration in Chinese liquor, which causes a dirty and dusty impression. The odor in Chinese liquor is similar to that of rice husk, one kind of auxiliary material widely used as a filler in the distillation process. So it is experientially hypothesized that such odor may derive from rice husk. In this paper, the gas chromatography-olfactometry (GC-O) technique and gas chromatography-mass spectrometry (GC-MS) were used to discover and identify the characteristic odoriferous zone of Chinese liquor marked by earthy odor. Geosmin was found to be responsible for this odor. The levels of the compound in ten bottled liquors and thirty liquors aging for different years belonging to four different aroma types were determined by the optimized headspace-solid phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) method. Quantitative analysis of bottled liquor revealed the presence of geosmin in all aroma type liquors with concentrations ranging from 1.10 μg/L to 9.90 μg/L, except for strong-aroma type liquor. Meanwhile in the aged liquors belonging to the same aroma type, geosmin was detected with significant concentrations and high odor activity values (OAVs) during different years of aging. However, geosmin was not detected in steamed rice husk nor in nonsteamed rice husk, which suggests that rice husk is not the origin of earthy odor in Chinese liquor, and there may be another origin of it during the brewing process.

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Section: Resultsmentioning

confidence: 99%

Characterization of Geosmin as Source of Earthy Odor in Different Aroma Type Chinese Liquors

Fan

2011

J. Agric. Food Chem.

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“…They include alcohols, aldehydes, ketones, esters, a pyridine, a pyrazine, a terpene, and three sulfurcontaining compounds. Many have been found in fruits, fungi, or yeast, and some play a role in insect chemical communication (20)(21)(22)(23)(24).…”

Section: Significancementioning

confidence: 99%

Functional diversity among sensory receptors in a Drosophila olfactory circuit

Mathew

Martelli

Kelley-Swift

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

107

184

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The ability of an animal to detect, discriminate, and respond to odors depends on the function of its olfactory receptor neurons (ORNs), which in turn depends ultimately on odorant receptors. To understand the diverse mechanisms used by an animal in olfactory coding and computation, it is essential to understand the functional diversity of its odor receptors. The larval olfactory system of Drosophila melanogaster contains 21 ORNs and a comparable number of odorant receptors whose properties have been examined in only a limited way. We systematically screened them with a panel of ∼500 odorants, yielding >10,000 receptor-odorant combinations. We identify for each of 19 receptors an odorant that excites it strongly. The responses elicited by each of these odorants are analyzed in detail. The odorants elicited little cross-activation of other receptors at the test concentration; thus, low concentrations of many of these odorants in nature may be signaled by a single ORN. The receptors differed dramatically in sensitivity to their cognate odorants. The responses showed diverse temporal dynamics, with some odorants eliciting supersustained responses. An intriguing question in the field concerns the roles of different ORNs and receptors in driving behavior. We found that the cognate odorants elicited behavioral responses that varied across a broad range. Some odorants elicited strong physiological responses but weak behavioral responses or weak physiological responses but strong behavioral responses.T he olfactory system of the Drosophila larva achieves remarkable function with minimal structure. It detects and responds to spatial and temporal gradients of odorants, transforming chemical information into navigation via an elegant repertoire of head sweeps, runs, and turns (1-3). Its sophisticated function is based on the activities of 21 olfactory receptor neurons (ORNs), which innervate the dorsal organ of the head and send axons to the antennal lobe of the brain (4). The activities of the ORNs are in turn based on the responses of odor receptors (Ors). Thus, to understand the molecular basis of larval olfactory navigation, it is necessary to understand the function of the receptors.ORNs together express 25 members of the Or family of odor receptors and the Orco coreceptor (5-8). In each ORN, an Or and Orco together form a ligand-gated ion channel (9-11). Most ORNs express a single Or, although one ORN coexpresses Or94a and Or94b and another ORN coexpresses Or33b and Or47a (7). The significance of this coexpression remains speculative, but the response profiles of some coexpressed adult Ors are additive (12).The responses of the larval Or repertoire to a limited odorant panel was previously examined in an in vivo expression system known as the empty neuron system (8, 13). With the use of this system, 21 of the larval Ors were found to be functional. However, studies of the larval Or repertoire have been limited not only in the number of odorants examined, but also in their consideration of receptor sensitivity, tempor...

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Phylogenetic Analysis and Characterization of Odorous Compound-Producing Actinomycetes in Sediments in the Sanbe Reservoir, A Drinking Water Reservoir in Japan

et al. 2022

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Identification of odorous compounds from nine fermentor-cultivated Streptomyces strains

Cited by 4 publications

References 24 publications

Characterization of Geosmin as Source of Earthy Odor in Different Aroma Type Chinese Liquors

Characterization of Geosmin as Source of Earthy Odor in Different Aroma Type Chinese Liquors

Functional diversity among sensory receptors in a Drosophila olfactory circuit

Phylogenetic Analysis and Characterization of Odorous Compound-Producing Actinomycetes in Sediments in the Sanbe Reservoir, A Drinking Water Reservoir in Japan

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