What has a structure resembling diferulic acid and is bright yellow?
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Diferulic acids Diferulic acids (also known as dehydrodiferulic acids) are organic compounds that have the general chemical formula CHO, they are formed by dimerisation of ferulic acid. Curcumin and curcuminoids, though having a structure resembling diferulic acids', are not formed that way but through a condensation process. Just as ferulic acid is not the proper IUPAC name, the diferulic acids also tend to have trivial names that are more commonly used than the correct IUPAC name. Diferulic acids are found in plant cell walls, particularly those of grasses.
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Curcumin Curcumin is a bright yellow chemical produced by some plants. It is the principal curcuminoid of turmeric ("Curcuma longa"), a member of the ginger family (Zingiberaceae). It is sold as an herbal supplement, cosmetics ingredient, food flavoring, and food coloring. As a food additive, its E number is E100.
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2,6-Di-tert-butylpyridine 2,6-Di-"tert"-butylpyridine is an organic compound with the formula (MeC)CHN. This colourless, oily liquid is derived from pyridine by replacement of the two H atoms with tert-butyl groups. It is a hindered base. For example, it can be protonated, but it does not form an adduct with boron trifluoride.
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Thulium(III) chloride Thulium(III) chloride or thulium trichloride is the chemical compound composed of thulium and chlorine with the formula TmCl. It forms yellow crystals. Thulium(III) chloride has the YCl (AlCl) layer structure with octahedral thulium ions.
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Gluconic acid Gluconic acid is an organic compound with molecular formula CHO and condensed structural formula HOCH(CHOH)COOH. It is one of the 16 stereoisomers of 2,3,4,5,6-pentahydroxyhexanoic acid.
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Mangostin Mangostin is a natural xanthonoid, a type of organic compound isolated from various parts of the mangosteen tree ("Garcinia mangostana"). It is a yellow crystalline solid with a xanthone core structure. Mangostin and a variety of other xanthonoids from mangosteen have been investigated for biological properties including antioxidant, anti-bacterial, anti-inflammatory, and anticancer activities.
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Tropolone Tropolone is an organic compound with the formula CH(OH)O. It is a pale yellow solid that is soluble in organic solvents. The compound has been of interest to research chemists because of its unusual electronic structure and its role as a ligand precursor. Although not usually prepared from tropone, it can be viewed as its derivative with a hydroxyl group in the 2-position.
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Naphthol yellow S Naphthol yellow S is an organic compound that is a dye. It is a derivative of 1-naphthol. At one time it was a popular food colorant but it was delisted in 1959 in the U.S.
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Lithium iodide Lithium iodide, or LiI, is a compound of lithium and iodine. When exposed to air, it becomes yellow in color, due to the oxidation of iodide to iodine. It crystallizes in the NaCl motif. It can participate in various hydrates.
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3,4-Dichlorphenylisocyanate 3,4-Dichlorphenylisocyanate is a chemical compound used as a chemical intermediate and in organic synthesis. It is a solid, and ranges in colour from white to yellow. It is an irritant for tissues including eyes and mucous membranes, and inhalation of dust from the chemical is poisonous. It can be used industrially in the preparation of triclocarban by reaction with "p"-chloroaniline.
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Homogentisic acid Homogentisic acid (2,5-dihydroxyphenylacetic acid) is a phenolic acid usually found in "Arbutus unedo" (strawberry-tree) honey. It is also present in the bacterial plant pathogen "Xanthomonas campestris pv. phaseoli" as well as in the yeast "Yarrowia lipolytica" where it is associated with the production of brown pigments.
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Acid-fastness Acid-fastness is a physical property of certain bacterial and eukaryotic cells, as well as some sub-cellular structures, specifically their resistance to decolorization by acids during laboratory staining procedures. Once stained as part of a sample, these organisms can resist the acid and/or ethanol-based decolorization procedures common in many staining protocols, hence the name "acid-fast".
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Dimethylheptylpyran Dimethylheptylpyran (DMHP, 3-(1,2-dimethylheptyl)-Δ-THC, 1,2-dimethylheptyl-ΔTHC, A-40824, EA-2233) is a synthetic analogue of THC, which was invented in 1949 during attempts to elucidate the structure of Δ-THC, one of the active components of cannabis. DMHP is a pale yellow, viscous oil which is insoluble in water, but dissolves in alcohol or non-polar solvents.
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Candelariella vitellina Candelariella vitellina is a common and widespread green-yellow to orange-yellow crustose areolate lichen that grows on rock, wood, and bark, all over the world. It grows on non-calcareous rock, wood, and bark. It often has tiny lobate areoles in the shape of lion claws. The areoles may be flat or convex. Its sexual reproduction structures (apothecia) are a 0.35–1.0 mm-wide disc, darker yellow than the thallus, rimmed with thallus-like tissue lecanorine, flat but becoming convex with age. Lichen spot tests are K+ reddish, KC-, and C-. It produces calycin, pulvinic acid, pulvinic dilactone and vulpinic acid as secondary metabolites.
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Heptasulfur imide Heptasulfur imide is the inorganic compound with the formula SNH. It is a pale yellow solid that is, like elemental sulfur, highly soluble in carbon disulfide. The compound, which is only of academic interest, is representative of a family of sulfur imides S(NH).
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Carborane acid Carborane acids H(CHBX) are a class of superacids at least one million times stronger than 100% sulfuric acid in terms of their Hammett acidity function ("H") values, which measure the ability of a medium or solvent to donate protons. The most well known example is chlorine based (X = Cl) [Figure 1]. The reason for their high acidities is that their conjugate bases, anions of the form (CHB11X11− ), are highly delocalized and stable species substituted with electronegative groups (the (pseudo)halogen X). They are the only acids known to protonate C fullerene without decomposing it. Additionally, they form stable, isolable salts with protonated benzene, C6H7+ .
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Sorbic acid Sorbic acid, or 2,4-hexadienoic acid, is a natural organic compound used as a food preservative. It has the chemical formula CH(CH)COH. It is a colourless solid that is slightly soluble in water and sublimes readily. It was first isolated from the unripe berries of the rowan tree ("Sorbus aucuparia"), hence its name.
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Paramylon Paramylon is a carbohydrate similar to starch. The chloroplasts found in "Euglena" contain chlorophyll which aids in the synthesis of carbohydrates to be stored as starch granules and paramylon. Paramylon is made in the pyrenoids of "Euglena". The euglenoids have chlorophylls a and b and they store their photosynthate in an unusual form called paramylon starch, a B-1,3 polymer of glucose. The paramylon is stored in rod like bodies throughout the cytoplasm, called paramylon bodies, which are often visible as colorless or white particles in light microscopy. Their shape is often characteristic of the "Euglena" species that produces them.
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Naphthionic acid Naphthionic acid is an organic compound with the formula CH(SOH)(NH). It is one of several aminonaphthalenesulfonic acids, derivatives of naphthalene containing both amine and sulfonic acid functional groups. It is a white solid, although commercial samples can appear gray. It is used in the synthesis of azo dyes such as Rocceline (a. k. a. Solid Red A), during which the amino group of the acid (in the form of a salt) is diazotated and then coupled with, in the case mentioned, β-naphthol. It is prepared by treating 1-aminonaphthalene with sulfuric acid.
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Homophthalic acid Homophthalic acid is a dicarboxylic acid with the formula CH(COH)CHCOH. It is a colorless solid. The compounds can be prepared by the Willgerodt reaction from 2-acetylbenzoic acid.
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Sulfonic acid A sulfonic acid (or sulphonic acid) refers to a member of the class of organosulfur compounds with the general formula R−S(=O)−OH, where R is an organic alkyl or aryl group and the S(=O)−OH group a sulfonyl hydroxide. A sulfonic acid can be thought of as sulfuric acid with one hydroxyl group replaced by an organic substituent. The parent compound (with the organic substituent replaced by hydrogen) is the hypothetical compound sulfurous acid. Salts or esters of sulfonic acids are called sulfonates.
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Tuataric acid Tuataric acid is an organic compound and an unsaturated carboxylic acid. This colourless compound was isolated in 2009 from the cloacal glands of the tuatara, a lizard-like reptile native to New Zealand. Its formal name is (4"E",6"Z")-octa-4,6-dienoic acid, and it consists of an unusual pair of conjugated alkene units with the E and Z configurations.