Month: November 2022

Wang, Chao published the artcileA comparative study of volatile components in Dianhong teas from fresh leaves of four tea cultivars by using chromatography-mass spectrometry, multivariate data analysis, and descriptive sensory analysis, Computed Properties of 21834-92-4, the main research area is Dianhong tea leaf volatile compound GC MS sensory property; Descriptive sensory analysis; Dianhong tea; Hierarchical cluster analysis; Partial least squares–discriminant analysis; Tea cultivars; Volatile compounds.

Dianhong teas produced from fresh leaves of different tea cultivars (YK is Yunkang Number 10, XY is Xueya 100, CY is Changyebaihao, SS is Shishengmiao), were compared in terms of volatile compounds and descriptive sensory anal. A total of 73 volatile compounds in 16 tea samples were tentatively identified. YK, XY, CY, and SS contained 55, 53, 49, and 51 volatile compounds, resp. Partial least squares-discriminant anal. (PLS-DA) and hierarchical cluster anal. (HCA) were used to classify the samples, and 40 key components were selected based on variable importance in the projection. Moreover, 11 flavor attributes, namely, floral, fruity, grass/green, woody, sweet, roasty, caramel, mellow and thick, bitter, astringent, and sweet aftertaste were identified through descriptive sensory anal. (DSA). In generally, innate differences among the tea varieties significantly affected the intensities of most of the key sensory attributes of Dianhong teas possibly because of the different amounts of aroma-active and taste components in Dianhong teas.

Food Research International published new progress about Acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

Zhao, Guozhong published the artcileGene regulation in Aspergillus oryzae promotes hyphal growth and flavor formation in soy sauce koji, Computed Properties of 21834-92-4, the main research area is Aspergillus gene regulation hyphal growth flavor soy sauce koji.

Aspergillus oryzae 100-8 and the parental strain A. oryzae 3.042 are used in soy sauce fermentation in China. The growth rate of A. oryzae 100-8 is faster than A. oryzae 3.042, and the soy sauce flavors obtained with A. oryzae 100-8 fermentation are better than those obtained with A. oryzae 3.042. In this study, comparisons were made through biomass, reactive oxygen species (ROS) and gas chromatog.-mass spectrometry (GC-MS) measurements, and the reasons for these differences were investigated through transcriptome and qRT-PCR anal. The anal. indicated that several unique genes are closely associated with hyphal growth and flavor formation, as demonstrated by changes in the expression levels of these genes. These unique genes regulate hyphal growth and flavor formation in soy sauce koji fermentation

RSC Advances published new progress about Acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

Wittanalai, Suttida published the artcileVolatile compounds of vegetarian soybean kapi, a fermented Thai food condiment, Application of 5-Methyl-2-phenylhex-2-enal, the main research area is Bacillus volatile compound soybean kapi.

Kapi is a traditional shrimp paste used as a food condiment in Thailand. Several vegetarian soybean kapi, S1-S5, were fermented from various bacterial starter cultures isolated from com. shrimp paste. The volatile compounds of S1-S5 were analyzed using SPME coupled with gas chromatog./mass spectrometry and compared to three samples of com. vegetarian kapi (J1-J3) and com. shrimp pastes (K1-K3). 124 Volatile compounds consisting of aldehydes, alcs., ketones, acids and esters, N-containing compounds, aromatic compounds, S-containing compounds, miscellaneous, indoles and hydrocarbons were identified. Principal component anal. and cluster anal. separated the volatile profile of the fermented samples into four groups. Vegetarian soybean kapi, S1, S4 and S5 produced from Bacillus subtilis IS4, TISTR10 and TISTR1, resp., were classified into the following groups containing com. kapi (J1, J2, K2 and K3), that had a predominance of indole, S-containing and N-containing compounds Sensory evaluation of S1 showed a strong kapi odor with higher scores among the vegetarian soybean kapi and there were no significant differences in evaluation scores between S1 and com. vegetarian kapi J1-J3. These data demonstrate that B. subtilis IS4 can be employed as a starter culture to produce an acceptable vegetarian soybean kapi substitute for shrimp paste kapi.

African Journal of Biotechnology published new progress about Acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

Huang, Meigui published the artcileContribution of sulfur-containing compounds to the colour-inhibiting effect and improved antioxidant activity of Maillard reaction products of soybean protein hydrolysates, Quality Control of 21834-92-4, the main research area is color antioxidant Maillard reaction soybean protein hydrolyzate.

BACKGROUND: Light-colored and savory-tasting flavor enhancers are attractive to both consumers and food producers. The aim of this study was to investigate the color-inhibiting effect of L-cysteine and thiamine during the Maillard reaction of soybean peptide and D-xylose. The correlation between volatile compounds and antioxidant activity of the corresponding products was also studied. RESULTS: Color formation was markedly suppressed by cysteine. Compared with peptide/xylose (PX), the taste profile of Maillard reaction products (MRPs) derived from peptide/xylose/cysteine (PXC) and peptide/xylose/cysteine/thiamine (PXCT) was stronger, including umami, mouthfulness, continuity, meaty and overall acceptance. PXC and PXCT also exhibited distinctly higher antioxidant activity. Principal component anal. was applied to investigate the correlation between antioxidant activity and volatile compounds Of 88 volatile compounds identified, 55 were significantly correlated with antioxidant activity by two principal components (accounting for 85.05% of the total variance). CONCLUSION: Effective color control of the Maillard reaction by L-cysteine may allow the production of healthier (higher antioxidant activity) and tastier foods to satisfy consumers’ and food producers’ demands. Light-colored products might be used as functional flavor enhancers in various food systems. Copyright © 2010 Society of Chem. Industry.

Journal of the Science of Food and Agriculture published new progress about Acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Quality Control of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Zhang, Wencan published the artcileSolid-state fermentation of palm kernels by Yarrowia lipolytica modulates the aroma of palm kernel oil, Application In Synthesis of 21834-92-4, the main research area is Yarrowia Elaeis seed kernel oil solid state fermentation.

Solid-state fermentation with Yarrowia lipolytica was applied to palm kernels (PK) with the aim to modulate the aroma of palm kernel oil (PKO) obtained after kernel roasting. The results showed that, the metabolic activities of Y. lipolityca brought about significant changes to the volatile profile of obtained PKO either by providing thermal reaction reactants or by directly contributing aroma compounds After fermentation, a decreased content in glucose (60%) while an elevated amount (7-fold) in free amino acids was found in PK, which further impacted the formation of volatile compounds by influencing the Maillard reaction and Strecker degradation during roasting. More Strecker aldehydes and N-heterocyclic compounds were formed in PKO derived from fermented PK especially after intensified roasting. In addition, the catabolism of Y. lipolytica imparted some distinct volatile compounds such as 2-phenylethanol to the obtained PKO. However, the lipase excreted by Y. lipolytica hydrolyzed PK lipids and released 5-fold more free fatty acids in fermented PKO, relative to the blank and control PKO, which likely contributed to the off-flavor. On the basis of all volatile categories, principal component anal. (PCA) clearly separated the fermented PKO from the blank and control PKO, with light roasted, fermented PKO being correlated with acids, alcs. and aliphatic aldehydes; medium and dark roasted, fermented PKO tending to be dominated by pyrroles, pyrazines and furanones, which is in correspondence with sensory changes of PKO. This study demonstrated that combining fermentation with roasting could provide a novel way to modulate the volatile composition and aroma of PKO.

Scientific Reports published new progress about Acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

Zheng, Qiaoran published the artcileEffects of drying methods on colour, amino acids, phenolic profile, microstructure and volatile aroma components of Boletus aereus slices, Safety of 5-Methyl-2-phenylhex-2-enal, the main research area is Boletus phenolics microstructure amino protocatechuic acid alochol antioxidant.

This study is to investigate the effects of hot air drying (HD) at 60-80°C (HD-60, HD-70 and HD-80), microwave pretreatment combined with HD (MHD), ultrasound pretreatment combined with HD (UHD) and vacuum freeze drying (FD) on the quality of Boletus aereus slices. Key characteristics, including color, free amino acids, microstructure, volatile aroma components, phenolic profile and antioxidant activity, were studied. Amongst these drying methods, FD was the best way to preserve color and volatiles of Boletus aereus slices. Fifteen amino acids were detected in Boletus aereus slices, and HD-60 showed a higher content of total amino acids than other drying regimes. Two phenolic acids were identified in Boletus aereus slices, namely, protocatechuic acid and p-hydroxybenzoic acid. MHD presented the highest content of phenolic compounds, followed by FD. Antioxidant capacity was pos. correlated with phenolic compounds of Boletus aereus slices. Moreover, the cell structure of Boletus aereus slices was damaged after drying, and FD had a more porous structure than other drying methods. These results will be beneficial to the further industrial production of Boletus aereus slices.

International Journal of Food Science and Technology published new progress about Acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Safety of 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Paul, Dipankar published the artcileA facile iron-catalyzed dual C-C bond cleavage: an approach towards triarylmethanes, HPLC of Formula: 151-10-0, the main research area is triarylmethane preparation; benzyl substituted diketone nucleophile dual bond cleavage iron catalyst.

A facile iron-catalyzed dual C-C bond cleaving reaction involving 1,3-dicarbonyl units along with electron-rich and sterically bulky arenes as efficient carbon-based leaving groups was developed. The scope of the dual C-C bond breaking reaction was studied in detail using a range of nucleophiles to synthesize sym. triarylmethanes in good to excellent yields. The intermediate of the reaction was isolated which was formed via the initial Csp3-Csp3 bond cleavage and subsequently converted the intermediate to the final product via the Csp3-Csp2 bond cleavage. A notable difference in the leaving aptitudes of the two carbon-based leaving groups perceived during the study enabled us to develop an application of the dual C-C bond breaking reaction for the synthesis of unsym. triarylmethanes in a stepwise manner. To improve the synthetic utility, a one-pot procedure to generate unsym. triarylmethanes via sequential C-C bond breaking reactions were also fashioned . In addition to studying a novel dual C-C bond breaking reaction and providing a hint to the mechanistic pathway, the application molded from the study for the synthesis of sym. and especially unsym. triarylmethanes may render value to the present work.

New Journal of Chemistry published new progress about 1,3-Dicarbonyl compounds Role: RCT (Reactant), RACT (Reactant or Reagent). 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, HPLC of Formula: 151-10-0.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Sarma, Daisy published the artcileVisible-light induced enhancement in the multi-catalytic activity of sulfated carbon dots for aerobic carbon-carbon bond formation, Formula: C8H10O2, the main research area is sulfated carbon dot aerobic bond formation photocatalyst visible light; xanthene ketone arene dicarbonyl dehydrogenative cross coupling visible light.

The development of carbonaceous materials as metal-free catalysts integrating different types of catalysis in a single system represents a significant advance in cascade/tandem organic synthesis. Zero-dimensional carbon dots with tuneable optical properties and easily modifiable surface functionalities can be harnessed as a carbocatalyst for merging photooxidation and acid-catalyzed reactions in one pot. Herein, we explore carbon dots decorated with hydrogen sulfate groups as a photocatalyst for the dehydrogenative cross-coupling of xanthenes with ketones, arenes and 1,3-dicarbonyl compounds that showed high efficiency and selectivity under visible-light irradiation The sulfated carbon dots demonstrate dual catalytic properties, wherein they induced the rapid photooxidation of xanthenes in the presence of mol. oxygen to form a hydroperoxy intermediate followed by coupling of nucleophiles catalyzed by the acidic surface functional groups. The methodol. represents an operationally simple pathway for the generation of C-C coupling products in a short reaction time with wide substrate scopes under mild conditions. The catalyst is easily separable and can be reused over multiple cycles with good efficiency.

Green Chemistry published new progress about 1,3-Dicarbonyl compounds Role: RCT (Reactant), RACT (Reactant or Reagent). 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Formula: C8H10O2.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Verma, Vibha published the artcileQuinolinium chlorochromate: an excellent reagent for N3-C4 dehydrogenation of dihydropyrimidinones and their antifungal evaluation, SDS of cas: 598-50-5, the main research area is pyrimidinone green preparation antifungal SAR; dihydropyrimidinone preparation antifungal SAR oxidation quinolinium chlorochromate; benzaldehyde ketoester urea Biginelli hydrochloric acid catalyst.

3,4-Dihydropyrimidin-2-ones (DHPMs) I [R1 = Ph, 3-HOC6H4, 2-O2NC6H4, etc.; R2 = Me, Et, i-Pr; R3 = H, Me] were synthesized by reaction of aromatic aldehydes, β-ketoester and urea/N-Me urea. These compounds I on oxidation with quinolinium chlorochromate as an oxidizing agent resulted into pyrimidin-2-ones II. The synthesized compounds I and II were screened against three test fungi of wheat crop, i.e., Alternaria triticina, Bipolaris sorokiniana and Ustilago segetum tritici by spore germination method. Compounds II showed excellent antifungal activity than compounds I with least ED50 values 42, 93 and 47 μg/mL. Among the tested compounds, compounds II [R1 = 4-O2NC6H4, R2 = i-Pr, R3 = H; R1 = 2,4-di-MeOC6H3, R2 = Et, R3 = Me] were found to be most active. Structure activity relationship showed that electron withdrawing group enhanced their efficacy due to +I effect and vice versa, whereas dehydrogenation improved their potential due to resonance stabilization of structures involved during electronic interactions between proteins of fungus cells and compounds

Indian Journal of Heterocyclic Chemistry published new progress about 1,3-Dicarbonyl compounds Role: RCT (Reactant), RACT (Reactant or Reagent). 598-50-5 belongs to class isoquinoline, name is 1-Methylurea, and the molecular formula is C2H6N2O, SDS of cas: 598-50-5.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Rahman, Taskia published the artcileSpinel Structured Copper Ferrite Nano Catalyst with Magnetic Recyclability for Oxidative Decarboxylation of Phenyl Acetic Acids, Related Products of isoquinoline, the main research area is copper ferrite catalyst oxidative decarboxylation phenyl acetic acid.

A simple, efficient and environmentally benign method has been discussed for the synthesis of aldehydes and ketones by the oxidative decarboxylation of phenylacetic acid under ligand free condition using simple, efficient, preparatively easy, magnetically recoverable and low cost spinel CuFe2O4 nanoparticles. The catalyst was characterized using powder-XRD, FTIR, FE-SEM, EDX, VSM and HRTEM. The recyclability was examined and the results showed that the catalyst remained almost equally active up to five consecutive cycles. Spinel Structured Copper Ferrite is a very efficient nano catalyst for Oxidative decarboxylation of Ph acetic acids and can be reused up to five cycles without significant loss in catalytic activity.

Catalysis Letters published new progress about Aromatic carboxylic acids Role: RCT (Reactant), RACT (Reactant or Reagent). 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem