Sodium hydrogencarbonate, sulphuric acid (96%), ortho phosphoric acid (85%), hydrogen peroxide 3% stabilized w/v VINIKIT, indicator 4,4, mixed (methyl red-methylene blue) VINIKIT, and Sodium hydroxide 0.01 molL−1 VINIKIT were from Panreac (Barcelona, Spain). L(+)-tartaric acid (99%), glycerol (99.5%), iron (II) chloride tetrahydrate (>99%), manganese (II) choride tetrahydrate (>99%), copper (I) chloride (99.9%), L-leucine (Leu) (>98%), L-isoleucine (Ile) (>98%), D-valine (Val) (>98%), L-phenylalanine (Phe) (>98%), D-methionine (Met) (>98%) and 4-methylcatechol (4m-catol) (>95%) were from Sigma-Aldrich Madrid, Spain. Isolute ENV+sorbent, 1 mL cartridges, PTFE frits and ethanol were purchased from Merck (Darmstadt, Germany). Sodium hydroxide 99% was purchased from Scharlab (Sentmenat, Spain). Isobutyraldehyde (99%), 2-methylbutanal (95%), phenylacetaldehyde (95%) and methional (98%), 2-methylpentanal (98%), 3-methylpentanal (97%) and O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA 98%) were supplied by Merck USA. Phenylacetaldehyde-d2 (95%) and methional-d2 were purchased from Eptes (Vevey, Switzerland). Water was purified in a Milli-Q system from Millipore (Bedford, Germany).
2 methylbutanal
Manufactured by Merck Group
Sourced in United States, Germany, Spain, United Kingdom
2-methylbutanal is a volatile organic compound used as a laboratory reagent. It is a colorless liquid with a pungent odor. The compound is commonly used in research and analytical applications.
Automatically generated - may contain errors
Lab products found in correlation
3 methylbutanal, by Merck Group (14 mentions)
Benzaldehyde, by Merck Group (8 mentions)
Hexanal, by Merck Group (8 mentions)
Ethanol, by Merck Group (5 mentions)
Pentanal, by Merck Group (5 mentions)
Nonanal, by Merck Group (5 mentions)
2 methylpropanal, by Merck Group (5 mentions)
Methional, by Merck Group (4 mentions)
Phenylacetaldehyde, by Merck Group (4 mentions)
Dimethyl sulfide, by Merck Group (4 mentions)
2 phenylethanol, by Merck Group (4 mentions)
Acetaldehyde, by Merck Group (4 mentions)
Acetoin, by Merck Group (4 mentions)
2 3 butanedione, by Merck Group (4 mentions)
Acetic acid, by Merck Group (4 mentions)
Butanoic acid, by Merck Group (4 mentions)
2 3 pentanedione, by Merck Group (4 mentions)
Ethyl acetate, by Merck Group (4 mentions)
1 octanol, by Merck Group (3 mentions)
Dimethyl disulfide, by Merck Group (3 mentions)
22 protocols using 2 methylbutanal
1
Analytical Methods for Food Volatiles
2
Synthesis of Fluorinated Benzylhydroxylamine Derivatives
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O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (≥99%), p-fluorobenzaldehyde (98%), 2-methylpropanal (2 MP) (≥99.5%), 2-methylbutanal (2 MB) (95%), 3-methylbutanal (3 MB) (97%), 2-phenylacetaldehyde (PA) (≥90%), Meth (≥97%), benzaldehyde (Benz) (≥99.5%), pentanal (≥97.5%), Hex (98%), heptanal (95%), T2N (97%), ACA (≥99.5%), and 4-vinylpyridine (95%) were obtained from Merck (Darmstadt, Germany). 2-Furfural (Fur) (≥99.0%) was purchased from Fluka Analytical (Charlotte, NC, USA). Ethanol p.a. was purchased from VWR (Darmstadt, Germany).
3
Development and Validation of TD-GC-qMS Method
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The TD-GC-qMS method development was done using dimethyl sulphide (1 , anhydrous, ≥ 99%), 2-methylbutanal (2 , 95%), dimethyl disulphide (3 , ≥ 98%), 2-hexanone (4 , analytical standard), 1-octanol (6 , anhydrous, ≥ 99%), 2-nonanone (7 , ≥ 99%), 1-undecene (8 , 97%), 1-decanol (9 , ≥ 9 8%) and 2-aminoacetophenone (10 , analytical standard) purchased from Sigma-Aldrich (Taufkirchen, Germany), and 2-heptanone (5 , ≥ 98%) purchased from Merck KGaA (Darmstadt, Germany).
To verify the analysis of cyclic siloxanes by atmospheric pressure ionization (APPI), coupled with thermogravimetry (TG) and a qMS, three cyclic siloxanes were analysed as single standards. Octamethylcyclotetrasiloxane (D4, 98%, Alfa Aesar, Karlsruhe, Germany), decamethylcyclopentasiloxane (D5, 97%, Alfa Aesar, Karlsruhe, Germany) and dodecamethylcyclohexasiloxane (D6, 95%, Alfa Aesar, Karlsruhe, Germany) were used.
For all purposes, liquid chromatography-mass spectrometry (LC-MS) grade methanol from VWR (Leuven, Belgium) and ultrapure water, generated with a water purification system from Sartorius Stedim (Göttingen, Germany), were used. For cleaning purpose, Decon 90 from VWR (Leuven, Belgium) was used.
To verify the analysis of cyclic siloxanes by atmospheric pressure ionization (APPI), coupled with thermogravimetry (TG) and a qMS, three cyclic siloxanes were analysed as single standards. Octamethylcyclotetrasiloxane (D4, 98%, Alfa Aesar, Karlsruhe, Germany), decamethylcyclopentasiloxane (D5, 97%, Alfa Aesar, Karlsruhe, Germany) and dodecamethylcyclohexasiloxane (D6, 95%, Alfa Aesar, Karlsruhe, Germany) were used.
For all purposes, liquid chromatography-mass spectrometry (LC-MS) grade methanol from VWR (Leuven, Belgium) and ultrapure water, generated with a water purification system from Sartorius Stedim (Göttingen, Germany), were used. For cleaning purpose, Decon 90 from VWR (Leuven, Belgium) was used.
4
Truffle Volatile Aroma Compounds
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The VOC components phenylacetaldehyde, 1-octen-3-ol, 3-methylthiophene, 2-butanone, nonanal, dimethyl sulfide (DMS), 2-methylbutanal, 2,4-dithiapentane, 3-methylbutanal, dimethyl disulfide (DMDS), and 3-methylthio-1-propanol were all purchased from Sigma-Aldrich at >98% purity. The white oil (runny, paraffinum perliquidum, pharmaceutical quality, Chemdiscount), the synthetic sponges (Belle Vous “round synthetic sponge”), and the truffle oil were purchased from commercial vendors. The truffle oil was sold with an indication of the respective type of truffle (Tuber melanosporum). Samples of the truffle varieties Tuber magnatum pico, Tuber melanosporum, Tuber aestivum, and Tuber indicum were purchased online (Buon Gusto C.N.C e.K., Braunschweig, Germany, 2021 and Terra Ross Ltd., Berlin, Germany, 2021). Immediately upon receipt, the truffle samples were visually and sensorially checked for the authenticity of the variety and freshness.
5
Quantitative Analysis of Food Volatiles
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All chemicals used had a purity grade higher than 95%. Hexanal, benzaldehyde, 2-methylpropanal, nonanal, 2-methylbutanal, 3-methylbutanal, and 4-fluorobenzaldehyde standards were purchased from Sigma-Aldrich (Steinheim, Germany). Acetaldehyde, phenylAcetaldehyde, 5-(hydroxymethyl) furfural, 2-furaldehyde, and trans-2-nonenal were purchased from Acros Organics (Geel, Belgium). Absolute ethanol, acetonitrile, and methanol (HPLC grade 99.99%) was obtained from Sigma-Aldrich (Steinheim, Germany). Sodium chloride was obtained from Panreac (Barcelona, Spain). Ultra-pure water with a resistivity of >18 MΩ.cm (type 1) was obtained from a Millipore Simplicity® UV apparatus (Milford, MA, USA). The alkane solution (C7–C30) was obtained from Supelco (Sigma Aldrich, St. Louis, MO, USA).
6
Volatile Compound Analysis by GC-MS
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All chemicals used had a purity grade higher than 95%. Hexanal, benzaldehyde, 2-methylpropanal, nonanal, 2-methylbutanal, 3-methylbutanal, and 4-fluorobenzaldehyde standards were purchased from Sigma-Aldrich (Steinheim, Germany). Acetaldehyde, phenylAcetaldehyde, 5-(hydroxymethyl) furfural, 2-furaldehyde and trans-2-nonenal were purchased from Acros Organics (Geel, Belgium). Absolute ethanol, acetonitrile, and methanol (all HPLC grade 99.99%) came from Sigma-Aldrich (Steinheim, Germany). Sodium chloride was obtained from Panreac (Barcelona, Spain). Ultra-pure water with a resistivity of >18 MΩ·cm (type 1) was obtained from a Millipore Simplicity® UV apparatus (Milford, MA, USA). The alkane solution (C7–C30) was obtained from Supelco (Sigma Aldrich, St. Louis, MO, USA).
7
Volatile Organic Compounds Analysis
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2-Butanone (≥99%), 2-furaldehyde (≥99%), 2-methylbutanal (90%), 4-heptanone (97%), carvone (≥98.5%), decanal (95%), decane (≥99%), formaldehyde (37% aqueous solution), hexanal (97%), methylglyoxal (40% aqueous solution), O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA) (≥ 99%), octanal (≥99%) and p-cresol (4-methylphenol) (≥98%) were purchased from Sigma-Aldrich (Madrid, Spain). Sodium chloride was supplied by VWR (Leuven, Belgium).
8
Comprehensive Flavor Compound Reference Protocol
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Reference standards (+) -β-Pinene (≥98.5%), 1-Octen-3-ol, borneol (≥95%), butyric acid (≥99.5%), citral (≥95%), cis-3-hexen-1-ol (≥98%), diacetyl, dimethyl sulphide, dimethyl trisulphide (≥98.5%), 3-methylbutanal (≥97%), 2-methylbutanal (≥95%), ethyl 2-methylbutanoate (99%), ethyl 2-methylpentanoate (internal standard, ≥99%), ethyl-3-methylbutanoate (≥98%), 3-methylbutyl-2-methylpropanoate (≥98%), 2-methylbutyl-2-methylpropanoate (≥95%), and ethyl cinnamate (99%), ethyl 2-methylpropanoate (≥99%), ethyl 3-methylbutanoate (≥98%), ethyl 4-methylpentanoate (≥97%), ethyl butanoate (≥99,5%), ethyl hexanoate (≥99.5%), eugenol (99.6%), furaneol (≥99%), geraniol (≥99%), hexanol (≥99%), 3-methylbutyl acetate (≥97%), linalool (97%), menthol (99%), methyl nonanoate (≥99.8%), myrcene (≥90%), geranyl acetate (≥97%), dimethyl disulphide (≥90%), limonene (97%), hexanal (≥98%), 3-hexenol (≥95%), 2-phenyl ethanol (≥99%), β-caryophyllene (≥80%), α-humulene (≥96%), humulene oxide, S-methyl 5-methylpentanthioate S-methyl hexanthioate, S-methyl 4-methylpentanoate and theaspirane (≥90%) were purchased from Sigma Aldrich (St. Louis, MO, USA).
9
Volatile Organic Compounds Analysis by HS-SPME-GC-MS
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All reagents utilized in this assay were of analytical quality. Sodium chloride (NaCl, 99.5%), and calcium chloride (CaCl2, >99.0%) were obtained from Panreac (Spain, Barcelona). Ultrapure water was supplied from a Milli-Q® system (Millipore); the 3-octanol used as internal standard and other VOCs for identification, namely, 1-butanol, 1-heptanol, 1-octanol, 1-propanol, (E)-2-hexenal, 2-methyl-butanal, 2-ethyl-1-hexanol, 2-methyl-1-propanol, 2-phenylethanol, acetaldehyde, benzaldehyde, ethanol, ethyl acetate, ethyl butanoate, ethyl decanoate, ethyl hexanoate, ethyl octanoate, ethyl propanoate, ethyl 3-hydroxybutanoate, hexyl acetate, and pentanal with purity up to 98% were acquired from Sigma Aldrich (Madrid, Spain). Helium gas purity of 5.0 (Air Liquide, Portugal) was utilized as the GC carrier gas. Solid-phase microextraction holder and divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) fiber were supplied from Supelco (Bellefonte, PA, USA). The Kovats index (KI) was calculated by the injection of a series of C8 to C20 straight-chain n-alkanes (at 40 mg L−1 in n-hexane) produced by Fluka (Buchs, Switzerland).
10
Analytical Standards for Aroma Compounds
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Dichloromethane, ethyl acetate, absolute ethanol (99%), and anhydrous sodium sulfate were purchased from VWR International (Leuven, Belgium). Standards of ethyl benzoate, methyl anthranilate, phenylacetaldehyde, 2-methylbutanal, 3-methylbutanal, heptan-2-one, heptan-2-ol, 2-methylbutyl acetate, trans-2-nonenal, methional, isobutyl acetate, benzaldehyde, myrcene, linalool, ethyl heptanoate, ethyl octanoate, 2-phenylethyl acetate, ethyl acetate, ethyl butanoate, isoamyl propionate, acetophenone, and 2-acetylthiophene were purchased from Sigma-Aldrich (Bornem, Belgium). Standard of nonan-2-one was purchased from Janssen Chimica (Geel, Belgium). Standards of dimethyltrisulfide and 1-octen-3-ol were purchased from Acros Organics (Geel, Belgium). Standard of 3-methylbutan-1-ol was purchased from Merck Millipore (Burlington, NJ, USA). Standard of acetoin was purchased from Supelco (Bellefonte, PA, USA).
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