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3-Isobutyl-2-methoxypyrazine
3-Isobutyl-2-methoxypyrazine (2-isobutyl-3-methoxypyrazine also known as Grindstaff pyrazine) is a methoxypyrazine that is very similar to isopropyl methoxy pyrazine except that the alkyl side-group contains an isobutyl group attached to the carbon alpha to the methoxy sidegroup instead of an isopropyl side-group at that same carbon position. Natural occurrence The molecule is produced by some plants and is a contributor to the aroma of several plant-based foods. It is also seen to be produced in some forms of Planktothrix, blue-green algae; however, it is most frequently found in members of the genus ''Capsicum''. Specifically, it is what gives a bell pepper, along with other peppers, their distinctive smell. This is to such an extent that Grindstaff pyrazine is sometimes just called the "bell pepper pyrazine." The human nose can detect concentrations of this molecule below the part per trillion level making it one of the most odor intensive compounds on earth. Unlike capsaicin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Methoxypyrazine
Methoxypyrazines are a class of chemical compounds that produce odors. The odors tend to be undesirable, as in the case of certain wines, or as defensive chemicals used by insects such as ''Harmonia axyridis'' which produces isopropyl methoxy pyrazine (IPMP). They have also been identified as List of additives in cigarettes, additives in cigarette manufacture. Detection thresholds are very low, typically near 2 parts per trillion (1 ng/L). Examples of methoxypyrazines in wine grapes Cabernet Sauvignon has high levels of methoxypyrazines.Oz Clarke ''Encyclopedia of Grapes'' pg 223 Harcourt Books 2001 Two methoxypyrazine compounds, 3-isobutyl-2-methoxypyrazine (IBMP) and 3-isopropyl-2-methoxypyrazine (IPMP), are considered to be important determinants of "green" (i.e., herbal, grassy, or vegetal) flavours in Sauvignon blanc wines.Marais, J., Hunter, J.J., & Haasbroek, P.D. (1999). Effect of microclimate, season and region on Sauvignon blanc grape composition and wine qual ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isopropyl Methoxy Pyrazine
Isopropyl methoxypyrazine (IPMP) is a methoxypyrazine, a class of chemical compounds that produce odors. The odor is rather undesirable and is produced by the Asian lady beetle or by the actinomycete '' Streptomyces'' sp. It can be detected by human taste at concentrations of as low as 2 nanograms per litre. Presence in wine grapes The odor of IPMP tends to be undesirable in the case of certain wines. Cabernet Sauvignon has high levels of methoxypyrazines.Oz Clarke ''Encyclopedia of Grapes'' pg 223 Harcourt Books 2001 Two methoxypyrazine compounds, 3-isobutyl-2-methoxypyrazine 3-Isobutyl-2-methoxypyrazine (2-isobutyl-3-methoxypyrazine also known as Grindstaff pyrazine) is a methoxypyrazine that is very similar to isopropyl methoxy pyrazine except that the alkyl side-group contains an isobutyl group attached to the carbo ... (IBMP) and 3-isopropyl-2-methoxypyrazine, are considered to be important determinants of green flavours in Sauvignon blanc wines. Presence in coffe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planktothrix
''Planktothrix'' is a diverse genus of filamentous cyanobacteria observed to amass in algal blooms in water ecosystems across the globe. Like all Oscillatoriales, ''Planktothrix'' species have no heterocyst, heterocysts and no akinetes. ''Planktothrix'' are unique because they have Trichome#Algal trichomes, trichomes and contain gas vacuoles unlike typical planktonic organisms. Previously, some species of the taxon were grouped within the genus ''Oscillatoria'', but recent work has defined ''Planktothrix'' as its own genus. A tremendous body of work on ''Planktothrix'' ecology and physiology has been done by A.E. Walsby, Anthony E. Walsby, and the 55.6 kb microcystin synthetase gene which gives these organisms the ability to synthesize toxins has been sequenced. ''P. agardhii'' is an example of a Holotype, type species of the genus. ''P. agardhii'' and ''P. rubescens'' are commonly observed in lakes of the Northern Hemisphere where they are known producers of potent hepatotoxins ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capsicum
''Capsicum'' () is a genus of flowering plants in the Solanum, nightshade family Solanaceae, native to the Americas, cultivated worldwide for their edible fruit, which are generally known as "peppers" or "capsicum". Chili peppers grow on five species of ''Capsicum''. Bell peppers, Sweet or bell peppers and some chili peppers are ''Capsicum annuum'', making it the most cultivated species in the genus. History ''Capsicum'' is native to South America and Central America. These plants have been evolving for 17 million years. It was domesticated and Mesoamerican agriculture, cultivated at least since 3000 BC, as evidenced by remains of chili peppers found in pottery from Puebla and Oaxaca. Etymology and names The generic name may come from Latin , meaning 'box', presumably alluding to the pods; or possibly from the Greek language, Greek word , , 'to gulp'. The name ''pepper'' comes from the similarity of piquance (spiciness or "heat") of the flavor to that of black pepper, ''Piper ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell Pepper
The bell pepper (also known as sweet pepper, paprika, pepper, capsicum or, in some parts of the US midwest, mango) is the fruit of plants in the Grossum Group of the species ''Capsicum annuum''. Cultivars of the plant produce fruits in different colors, including red, yellow, orange, green, white, chocolate, candy cane striped, and purple. Bell peppers are sometimes grouped with less pungent chili varieties as "sweet peppers". While they are botanically fruits—classified as berries—they are commonly used as a vegetable ingredient or side dish. Other varieties of the genus ''Capsicum'' are categorized as ''chili peppers'' when they are cultivated for their pungency, including some varieties of ''Capsicum annuum''. Peppers are native to Mexico, Central America, the Caribbean and northern South America. Pepper seeds were imported to Spain in 1493 and then spread through Europe and Asia. Preferred growing conditions for bell peppers include warm, moist soil in a t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrazine
Pyrazine is a heterocyclic aromatic organic compound with the chemical formula C4H4N2. It is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. It is a ''"deliquescent crystal or wax-like solid with a pungent, sweet, corn-like, nutty odour"''. Pyrazine and a variety of alkylpyrazines are flavor and aroma compounds found in baked and roasted goods. Tetramethylpyrazine (also known as ligustrazine) is reported to scavenge superoxide anions and decrease nitric oxide production in human granulocytes. Synthesis Many methods exist for the organic synthesis of pyrazine and its derivatives. Some of these are among the oldest synthesis reactions still in use. In the Staedel–Rugheimer pyrazine synthesis (1876), 2-chloroacetophenone is reacted with ammonia to the amino ketone, then condensed and then oxidized to a pyrazine. A variation is the Gutknecht pyrazine synthesis (1879) also based on this selfcondensation, but di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capsaicin
Capsaicin (8-methyl-''N''-vanillyl-6-nonenamide) (, rarely ) is an active component of chili peppers, which are plants belonging to the genus ''Capsicum''. It is a potent Irritation, irritant for Mammal, mammals, including humans, and produces a sensation of burning in any Tissue (biology), tissue with which it comes into contact. Capsaicin and several related amides (capsaicinoids) are produced as secondary metabolites by chili peppers, likely as deterrents against certain mammals and fungi. Pure capsaicin is a hydrophobic, colorless, highly pungent (i.e., spicy) crystalline solid. Natural function Capsaicin is present in large quantities in the Placentation#In plants, placental tissue (which holds the seeds), the internal membranes and, to a lesser extent, the other fleshy parts of the fruits of plants in the genus ''Capsicum''. The seeds themselves do not produce any capsaicin, although the highest concentration of capsaicin can be found in the white Fruit anatomy#Mesocar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudoephedrine
Pseudoephedrine, sold under the brand name Sudafed among others, is a sympathomimetic medication which is used as a decongestant to treat nasal congestion. It has also been used off-label for certain other indications, like treatment of low blood pressure. At higher doses, it may produce various additional effects including stimulant, appetite suppressant, and performance-enhancing effects. In relation to this, non-medical use of pseudoephedrine has been encountered. The medication is taken by mouth. Side effects of pseudoephedrine include insomnia, elevated heart rate, increased blood pressure, restlessness, dizziness, anxiety, and dry mouth, among others. Rarely, pseudoephedrine has been associated with serious cardiovascular complications like heart attack and hemorrhagic stroke. Some people may be more sensitive to its cardiovascular effects. Pseudoephedrine acts as a norepinephrine releasing agent, thereby indirectly activating adrenergic receptors. As such, it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Methamphetamine
Methamphetamine (contracted from ) is a potent central nervous system (CNS) stimulant that is mainly used as a recreational drug use, recreational or Performance-enhancing substance, performance-enhancing drug and less commonly as a second-line treatment for attention deficit hyperactivity disorder (ADHD). It has also been researched as a potential treatment for traumatic brain injury. Methamphetamine was discovered in 1893 and exists as two enantiomers: levo-methamphetamine and dextro-methamphetamine. ''Methamphetamine'' properly refers to a specific chemical substance, the racemic mixture, racemic free base, which is an equal mixture of levomethamphetamine and dextromethamphetamine in their pure amine forms, but the hydrochloride salt, commonly called crystal meth, is widely used. Methamphetamine is rarely prescribed over concerns involving its potential for recreational use as an aphrodisiac and euphoriant, among other concerns, as well as the availability of safer subst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Note (perfumery)
Notes in perfumery are descriptors of scents that can be sensed upon the application of a perfume. Notes are separated into three classes: top/head notes, middle/heart notes, and base/soul notes; which denote groups of scents which can be sensed with respect to the time after the application of a perfume. These notes are created with knowledge of the evaporation process and intended use of the perfume. The presence of one note may alter the perception of another—for instance, the presence of certain base or heart notes will alter the scent perceived when the top notes are strongest, and likewise the scent of base notes in the dry-down will often be altered depending on the smells of the heart notes. The idea of ''notes'' is used primarily for the marketing of fine fragrances. The term is sometimes used by perfumers to describe approximately scents or the perfumery process to laypeople. Volatility grouping Fragrant materials are listed by Poucher in order of volatility and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2p70
P7, P.7, or P-7 may refer to: Aircraft * Boeing XP-7, a prototype United States biplane fighter of the 1920s * Lockheed P-7, a proposed patrol aircraft ordered by the U.S. Navy * Piaggio P.7, an Italian hydrofoil racing seaplane of 1929 * PZL P.7, a 1930 Polish fighter aircraft Science * p7 protein, a protein providing nucleocapsid of HIV * Period 7 of the periodic table * Seoul Semiconductor, high-energy quad-chip LED light (SSC P7) * HAT-P-7b, an extrasolar planet discovered in 2008 Computer science * Intel Itanium processor code-name * Intel NetBurst, a seventh generation x86 microarchitecture * X.400 protocol for access of a message store from a user agent Other * Cinturato P7 tire developed by Pirelli * DR P7 Mix, a former radio station operated by the Danish Broadcasting Corporation * Heckler & Koch P7, a semi-automatic pistol manufactured in Germany * ProSieben, a German television channel * Russian Sky Airlines IATA airline code * South Scanian Regiment, Swedish Army arm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrazines
Pyrazine is a heterocyclic aromatic organic compound with the chemical formula C4H4N2. It is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. It is a ''"deliquescent crystal or wax-like solid with a pungent, sweet, corn-like, nutty odour"''. Pyrazine and a variety of alkylpyrazines are flavor and aroma compounds found in baked and roasted goods. Tetramethylpyrazine (also known as ligustrazine) is reported to scavenge superoxide anions and decrease nitric oxide production in human granulocytes. Synthesis Many methods exist for the organic synthesis of pyrazine and its derivatives. Some of these are among the oldest synthesis reactions still in use. In the Staedel–Rugheimer pyrazine synthesis (1876), 2-chloroacetophenone is reacted with ammonia to the amino ketone, then condensed and then oxidized to a pyrazine. A variation is the Gutknecht pyrazine synthesis (1879) also based on this selfcondensation, but dif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
