Category: 21834-92-4

Albak, F. published the artcileVariation of total aroma and polyphenol content of dark chocolate during three phase of conching, Name: 5-Methyl-2-phenylhex-2-enal, the main research area is polyphenol caffeine theobromine aroma conching dark chocolate; Aroma; Caffein; Dark chocolate; Phases of conching; Polyphenol and theobromine.

Variation in the volatiles, total polyphenol, theobromine and caffeine was investigated both qual. and quant. for all phases of conching with GC/MS/SPME, HPLC, GC/O, and UV-visible spectrophotometry. The volatile compounds being identified during the three phases consisted of aldehydes, ketones, pyrazines, acids, alcs. and esters. The number and concentration of these compounds were observed to be 31-25,681 ppb, 44-34,838 ppb and 44-29,809 ppb in the dry, pasty, and liquid phases resp. The odor of dark chocolate was described as nutty, sweet, caramel, green and chocolate using olfactometry. The percent decrease in the concentration of total polyphenol, caffeine and theobromine was observed to be only 3.0, 11.0, and 32.0 resp.

Journal of Food Science and Technology (New Delhi, India) published new progress about Dark chocolate. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Name: 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Utrilla-Vazquez, Marycarmen published the artcileAnalysis of volatile compounds of five varieties of Maya cocoa during fermentation and drying processes by Venn diagram and PCA, Category: isoquinoline, the main research area is volatile compound maya cocoa during fermentation drying processes; 2-Heptanone (PubChem CID: 8051); 2-Methylbutanal (PubChem CID: 7284); 2-Nonanone (PubChem CID: 13187); Acetophenone (PubChem CID: 7410); Benzeneacetaldehyde (PubChem CID: 998); Benzonitrile (PubChem CID: 7505); Cocoa beans; Criollo and Trinitario; Fermented and unfermented; Furfural (PubChem CID: 7362); Isobutyl benzoate (PubChem CID: 61048); Trimethylpyrazine (PubChem CID: 26808); Volatile profile, aromatic quality; β-Myrcene (PubChem CID: 31253).

Fermented cocoa beans can be described as a complex matrix that integrates the chem. history of beans, their processing, and environmental factors. This study presents an anal. that aims to identify volatile compounds of five varieties of fine-aroma cocoa types. The cocoa types studied were Carmelo, Rojo Samuel, Lagarto, Arcoiris, Regalo de Dios, that grow in the Maya lands of Chiapas, Mexico. Profile of volatile compounds was obtained from each cacao type during fermentation and drying process. This profile of volatile compounds also was compared with beans unfermented, using a statistical anal. of Venn diagram and a multivariate Anal. of Principal Components (PCA). One hundred nine different compounds were identified by SPME-HS GC-MS, these compounds mainly related to desirable aromatic notes generated by esters, aldehydes, ketones, and alcs. The differences in chem. composition of the volatile compounds were associated mainly with the process and not to cocoa varieties. Fermented dry cocoa beans showed a higher content of esters, aldehydes, pyrazines, alcs., some acids, and furans where Lagarto (CL), Rojo Samuel (CR), and Regalo de Dios (TRD) cocoas type showed a more interesting aromatic profile. On the other hand, as expected dry unfermented cocoas presented a few numbers of aroma compounds, in the five cacao types, where alcs., ketones and hydrocarbons predominated.

Food Research International published new progress about Drying process. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Category: isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Shen, Qing published the artcileVolatile compounds and antioxidant properties of pickled and dried mustard as influenced by different cooking methods, Synthetic Route of 21834-92-4, the main research area is pickled dried mustard volatile compound antioxidant steaming boiling microwaving.

Pickled and dried mustard (PDM; Brassica juncea, Coss), a traditional fermented vegetable product, is very popular in China because of its typical aromatic flavor and great antioxidant activity. PDM is usually consumed after being cooked by various cooking methods. Here, we determined and compared the effects of four different common cooking methods (steaming, high-pressure steaming, boiling, and microwaving) with different cooking time on the volatile compounds and antioxidant properties of PDM. The gas chromatog.-mass spectrometry results showed that steaming for 15 min and high-pressure steaming for 5 min significantly increased the concentration of volatile compounds of PDM while boiling and microwaving obviously decreased them. Moreover, high-pressure steaming best preserved the antioxidant activity, obtained from ABTS, DPPH, FRAP, and ORAC assays, as well as the total phenolic, flavonoid, and glucosinolate content of PDM. These findings provide insights into the beneficial effects of high-pressure steaming for 5 min in cooking PDM. Practical applications : Our findings showed that high-pressure steaming for short time (5 min) was the best way to cook PDM because it could not only significantly increase volatile compounds of PDM but also had the preservation effects of antioxidant activity of PDM. By contrast, boiling and microwaving dramatically decreased the volatile compounds and antioxidant properties of PDM mainly because of leaching action. These findings provide useful information for food producers and consumers to optimize the processing and cooking of PDM products with better flavor and health-related characteristics.

Journal of Food Processing and Preservation published new progress about Boiling (cooking). 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Synthetic Route of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Liang, Jingjing published the artcileAroma Constituents in Shanxi Aged Vinegar before and after Aging, Application In Synthesis of 21834-92-4, the main research area is aroma compound aged Shanxi vinegar; GC−O; Shanxi aged vinegar; aroma extract dilution analysis; quantitation; selected reaction monitoring; solvent-assisted flavor evaporation.

Shanxi aged vinegar is one of the most famous Chinese traditional cereal vinegars produced by spontaneous solid-state fermentation However, the aroma composition of Shanxi aged vinegar is still ambiguous. The Shanxi vinegars before and after aging were both analyzed by solvent-assisted flavor evaporation combined with gas chromatog.-mass spectrometry (GC-MS) as well as gas chromatog.-olfactometry (GC-O) in aroma extract dilution anal. A total of 87 odor-active regions were found by GC-O, and 80 odor-active compounds were identified. By GC-MS/MS, in selected reaction monitoring mode, 30 important identifications were quantitated using authentic standards In comparison, the aroma mols. for the vinegars before and after aging were almost the same; only their levels were altered, with mostly the esters and some compounds that produce pungent smells being lost and the levels of those from the Maillard reaction, especially the pyrazines (e.g., tetramethylpyrazine), being greatly increased. As for the aged vinegar, the compounds found to have high flavor dilution factors (>128) were 3-(methylthio)propanal, vanillin, 2,3-butanedione, tetramethylpyrazine, 3-methylbutanoic acid, γ-nonalactone, guaiacol, 3-(methylthio)propyl acetate, di-Me trisulfide, phenylacetaldehyde, 2-ethyl-6-methylpyrazine, 2-acetylpyrazine, 2,3-dimethylpyrazine, furfural, and 3-hydroxy-2-butanone. However, the aroma compounds found at high concentrations (>25 μg/L) in the aged vinegar were acetic acid, followed by 2,3-butanedione, furfural, 3-hydroxy-2-butanone, tetramethylpyrazine, furfuryl alc., and 3-methylbutanoic acid.

Journal of Agricultural and Food Chemistry published new progress about Aging of materials. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Application In Synthesis of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Yu, Xiaohang published the artcileBiochemical properties of fish sauce prepared using low salt, solid state fermentation with anchovy by-products, Application of 5-Methyl-2-phenylhex-2-enal, the main research area is biochem property solid state fermentation salt Engraulis sauce.

Biochem. characteristics of fast fermented fish sauce made by adding anchovy juice during the process of low salt, solid state fermentation were investigated using 3 different techniques (A: adding anchovy juice in the process of making koji, B: adding anchovy juice in the process of fermentation, and C: not adding anchovy juice). After fermentation under optimized conditions, the amino nitrogen contents of sauces A and B were 7.50 and 7.73 mg/mL after two weeks, resp. Chem. anal. suggested that the amounts of amino nitrogen and reducing sugar, degree of hydrolysis (DH), DPPH radical-scavenging activity, total acidity, and total amino acid in sauce B were higher than those in sauce A. Volatile odorant anal. and sensory evaluation showed that sauce B was superior to sauce A. Adding anchovy juice during the process of fermentation is a good way to produce a fish sauce with a good flavor and nutrition value.

Food Science and Biotechnology published new progress about Aspergillus oryzae. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Application of 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Urbisch, Daniel published the artcileAssessment of Pre- and Pro-haptens Using Nonanimal Test Methods for Skin Sensitization, Name: 5-Methyl-2-phenylhex-2-enal, the main research area is prehapten prohapten skin sensitization.

Because of ethical and regulatory reasons, several nonanimal test methods to assess the skin sensitization potential of chems. have been developed and validated. In contrast to in vivo methods, they lack or provide limited metabolic capacity. For this reason, identification of pro-haptens but also pre-haptens, which require mol. transformations to gain peptide reactivity, is a challenge for these methods. In this study, 27 pre- and pro-haptens were tested using nonanimal test methods. Of these, 18 provided true pos. results in the direct peptide reactivity assay (DPRA; sensitivity of 67%), although lacking structural alerts for direct peptide reactivity. The reaction mechanisms leading to peptide depletion in the DPRA were therefore elucidated using mass spectrometry. Hapten-peptide adducts were identified for 13 of the 18 chems. indicating that these pre-haptens were activated and that peptide binding occurred. Pos. results for five of the 18 chems. can be explained by dipeptide formations or the oxidation of the sulfhydryl group of the peptide. Nine of the 27 chems. were tested neg. in the DPRA. Of these, four yielded true pos. results in the keratinocyte and dendritic cell based assays. Likewise, 16 of the 18 chems. tested pos. in the DPRA were also pos. in either one or both of the cell-based assays. A combination of DPRA, KeratinoSens, and h-CLAT used in a 2 out of 3 weight of evidence (WoE) approach identified 22 of the 27 pre- and pro-haptens correctly (sensitivity of 81%), exhibiting a similar sensitivity as for directly acting haptens. This anal. shows that the combination of in chemico and in vitro test methods is suitable to identify pre-haptens and the majority of pro-haptens.

Chemical Research in Toxicology published new progress about Contact dermatitis. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Name: 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Dearden, J. C. published the artcileMechanism-Based QSAR Modeling of Skin Sensitization, SDS of cas: 21834-92-4, the main research area is skin sensitizer QSAR modeling.

Many chems. can induce skin sensitization, and there is a pressing need for non-animal methods to give a quant. indication of potency. Using two large published data sets of skin sensitizers, we have allocated each sensitizing chem. to one of 10 mechanistic categories and then developed good QSAR models for the seven categories that have a sufficient number of chems. to allow modeling. Both internal and external validation checks showed that each model had good predictivity.

Chemical Research in Toxicology published new progress about Contact dermatitis. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, SDS of cas: 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Febrianto, N. A. published the artcileCocoa-like flavor compound development of rambutan seed fat as the effect of fermentation and roasting, Name: 5-Methyl-2-phenylhex-2-enal, the main research area is rambutan seed fat fermentation roasting pyrazine ketone alc ester.

Rambutan seed waste has become a noteworthy problem in rambutan canning industry that need to be solved. Previous finding showed that rambutan seed could be utilized by extracting the fat that could be utilized as confectionery fat with improved characteristic by fermentation and roasting treatment. The study to evaluate the cocoa-like flavor compounds development as the effect of these process was carried out. The rambutan seed was fermented for 3, 6, and 9 days followed/unfollowed by roasting process at 150°C for 30 min. The browning index of the powder, the Maillard Reaction Products (MRPs) and the volatile flavor compounds of the rambutan seed fat were analyzed. The study found that the fermentation treatment followed by roasting treatment significantly increase the browning index and melanoidin content in powder and fat, resp. Six and 9 days fermentation followed by roasting possessed highest value of browning index (1.4875 and 1.5485 AU, resp.) and melanoidin content (0.318 and 0.295 AU, resp.). The result also showed that fermentation of rambutan seed followed by roasting process could successfully developed desired pyrazine compounds, in which the contribution of the pyrazine content could be as much as 42.69% of total flavor compound of rambutan seed fat.

International Food Research Journal published new progress about Bacillus megaterium. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Name: 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Joshi, Robin published the artcileEffect of decaffeination conditions on quality parameters of Kangra orthodox black tea, HPLC of Formula: 21834-92-4, the main research area is temperature pressure black tea decaffeination volatile supercritical carbon dioxide.

Effect of extraction temperature and pressure on the removal of caffeine from Kangra orthodox black tea using supercritical carbon dioxide was investigated. Maximum caffeine as well as volatile flavor components was extracted at 35 °C/170 bar using 60 g/min flow rate for 90 min extraction in dynamic mode. Satisfactory decaffeination and quality retention were achieved at extraction at 60 °C/90 bar. The quality of extracts reduced at higher extraction temperature and pressure combinations. Maximum amounts of theaflavins (88.88%), thearubigins (81.18%) and catechins (73.53%) were retained at these extraction conditions. Volatile components in original (caffeinated) and decaffeinated black teas were isolated by simultaneous distillation extraction (SDE), and analyzed by gas chromatog. (GC) and gas chromatog.-mass spectrometry (GC-MS). 2-Hexenal, 3-hexenol, phenylacetaldehyde, cis-linalool oxide, linalool, trans-geraniol, nerolidol, Me salicylate, α- and β-ionones decreased in decaffeinated black teas compared to untreated control. β-ionone (1.77%), trans-linalool oxide (5.36%), linalool (7.84%), trans-geraniol (4.32%) and Me salicylate (1.90%) were retained in satisfactory amount in decaffeination at 60 °C/90 bar. Application of aroma extract dilution anal. revealed 11 odor active compounds with flavor dilution (FD) factor ranging from 8 to 512 and odor quality investigated by GC-FID, GC-MS. Some unknown compounds quant. reduced or disappeared during decaffeination process. Although there was considerable loss of theaflavins and thearubigins as well as volatile flavor components, SFE extraction at 60 °C/90 bar for 90 min appears as the method suitable for selective removal of caffeine from the Kangra orthodox black tea.

Food Research International published new progress about Black tea beverages. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, HPLC of Formula: 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Chen, Xiaohua published the artcileAroma characterization of Hanzhong black tea (Camellia sinensis) using solid phase extraction coupled with gas chromatography-mass spectrometry and olfactometry and sensory analysis, Computed Properties of 21834-92-4, the main research area is aroma compound Hanzhong black tea solid extraction; Aroma; GC; Odor; Olfactometry; Sensory; Solid phase extraction; Tea.

The unique aroma of the Hanzhong black tea is due to the special location of the harvesting place and specific manufacturing processes. In this study, a solid phase extraction method (SPE) as sample preparation tool was combined with gas chromatog. (GC) as separation technique and several detection systems such as mass spectrometry (MS), flame ionization (FID) and olfactometry (O), which, together with sensorial anal. were used to characterize aroma compounds in Hanzhong black tea infusion. Seventy three aroma compounds were identified and quantified in the tea infusion by the GC-MS and GC-FID methods, resp. Among them, odor perceptions of 24 compounds were characterized by the GC-O anal. It was found that linalool oxide I, II and III, E,E-2,4-nonadienal, 4,5-dimethyl-3-hydroxy-2,5-dihydrofuran-2-one, 1-octen-3-one, E,Z-2,6-nonadienal, bis(2-methyl-3-furyl) disulfide had higher odor activity value in the tea infusion and offered floral, fatty, and caramel, mushroom, cucumber, and cooked beef -like odors, resp. Overall, floral and mushroom and caramel -like odors significantly dominated in the Hanzhong black tea infusion.

Food Chemistry published new progress about Black tea beverages. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Computed Properties of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem