Tag: 100-200

Rapid differentiation of Chinese hop varieties (Humulus lupulus) using volatile fingerprinting by HS-SPME-GC-MS combined with multivariate statistical analysis was written by Liu, Zechang;Wang, Liping;Liu, Yumei. And the article was included in Journal of the Science of Food and Agriculture in 2018.Synthetic Route of C8H16O2 The following contents are mentioned in the article:

BACKGROUND : Hops impart flavor to beer, with the volatile components characterizing the various hop varieties and qualities. Fingerprinting, especially flavor fingerprinting, is often used to identify ‘flavor products’ because inconsistencies in the description of flavor may lead to an incorrect definition of beer quality. Compared to flavor fingerprinting, volatile fingerprinting is simpler and easier. RESULTS : We performed volatile fingerprinting using head space-solid phase micro-extraction gas chromatog.-mass spectrometry combined with similarity anal. and principal component anal. (PCA) for evaluating and distinguishing between three major Chinese hops. Eighty-four volatiles were identified, which were classified into seven categories. Volatile fingerprinting based on similarity anal. did not yield any obvious result. By contrast, hop varieties and qualities were identified using volatile fingerprinting based on PCA. The potential variables explained the variance in the three hop varieties. In addition, the dendrogram and principal component score plot described the differences and classifications of hops. CONCLUSION : Volatile fingerprinting plus multivariate statistical anal. can rapidly differentiate between the different varieties and qualities of the three major Chinese hops. Furthermore, this method can be used as a reference in other fields. © 2018 Society of Chem. Industry. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Synthetic Route of C8H16O2).

Methyl heptanoate (cas: 106-73-0) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Synthetic Route of C8H16O2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Changes in the aroma characteristics during the different processes of dry Cabernet Sauvignon wine production was written by Guo, Yingying;Zhang, Yancong;Yu, Ran;Wang, Fang;Wang, Wei;Zhang, Dai;Zhang, Jun. And the article was included in European Food Research and Technology.Application of 2198-61-0 The following contents are mentioned in the article:

Wine contains a multitude of volatile and non-volatile compounds The sensory characteristics of wine are strongly influenced by the volatile aromas. In this study, we used headspace solid-phase micro-extraction (HS-SPME) and gas chromatog. mass spectrometry (GC-MS) to analyze the Cabernet Sauvignon Grape samples obtained from Ningxia (China) processed by drying, winemaking, and aging, resp. Thirty-seven compounds that significantly influenced the wine aroma characteristics were analyzed quant. Results showed a close correlation of grape or wine volatile components with the flavor characteristics. 16, 29, and 32 aroma compounds were characterized during the drying, fermentation, and aging processes, resp. Drying of Cabernet Sauvignon decreased fruity aromas but enhanced herbaceous and caramel aromas. After fermentation, the aroma component showed substantial increase, with more pronounced caramel, floral, and fruity characteristics in the wine. The aging process decreased the aroma content, but there appeared to be a pos. influence on the formation of aging aromas, such as furfuryl alc., furfural, and 5-methylfurfural. The aging process not only directly altered the general composition of wine, but also showed a pos. influence on sensory properties. These findings shed new light on the mechanism of wine drying, fermentation, and aging process, which can help improve wine characteristics. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Application of 2198-61-0).

Isopentyl hexanoate (cas: 2198-61-0) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Application of 2198-61-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

The influence of ripeness stage and growth area on myrtle-leaved orange (chinotto) peel essential oil composition was written by Flamini, Guido;Pistelli, Laura;Ascrizzi, Roberta;Pistelli, Luisa;Zinnai, Angela. And the article was included in Biochemical Systematics and Ecology in 2020.Application of 112-14-1 The following contents are mentioned in the article:

Myrtle-leaved orange, or chinotto, is a Chinese lesser-known citrus, nowadays cultivated in all the Mediterranean area of Italy. Its fruits are traditionally used in the confectionary and beverage industries: the former mainly uses the unripe fruits, while the juice of the ripe ones is the core ingredient of the well-known Italian soft drink “Chinotto”. In the present work, the compositions of several accessions of chinotto fruit peel essential oils (EOs) have been analyzed by GC-MS: in particular, i) fresh specimens from Savona (Liguria, Italy) at different ripening stages, as well as a dried ripe one; ii) two accessions from Pisa (Tuscany, Italy), of which one native and one transplanted from Savona. A comparison of the analyzed samples with literature reported EO compositions has been performed by means of multivariate statistical anal. The aim was to assess the influence of both the ripening stage and the geog. area of collection on the EO, assessing which factor influenced it the most. The ripening stage influence on the EO composition was found to be less significant compared to the geog. area of growth of the specimens. The statistical analyses, indeed, evidenced a proximity in the compositions obtained from the different ripening stages, whereas greater differences were evidenced for samples at the same ripening phase, but coming from different regions. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Application of 112-14-1).

Octyl acetate (cas: 112-14-1) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Application of 112-14-1

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Influence of nitrogen supply and substrate interactions on the removal of paint VOC mixtures in a hybrid bioreactor was written by Song, JiHyeon;Kinney, Kerry A.;John, Paul. And the article was included in Environmental Progress in 2003.Recommanded Product: 763-69-9 The following contents are mentioned in the article:

The study presented here was designed to investigate VOC degradation patterns as a function of nitrogen availability in a hybrid vapor-phase bioreactor column treating a surrogate paint VOC mixture The mixture consisted of Me Pr ketone, Et 3-ethoxy propionate, Bu acetate, toluene and p-xylene. In order to quantify nitrogen requirements, a series of experiments was conducted under various nitrogen-limited and nitrogen-rich conditions. Overall, increasing nitrogen availability improved the total VOC removal efficiencies from approx. 70% to 99%. At the lowest available nitrogen condition, most of the Et 3-ethoxy propionate and Bu acetate, as well as approx. 75% of the Me Pr ketone were removed in the bioreactor, but toluene and p-xylene were not biodegraded. Increasing the nitrogen availability improved the biodegradation of Me Pr ketone. Substantial degradation of toluene and p-xylene occurred in this study only after the molar ratio of the aromatic compounds to the other constituents in the waste gas stream increased above 2.0. Elimination capacity tests performed with the VOC mixture and each individual VOC indicated that the presence of other VOCs inhibited the biodegradation of toluene and p-xylene. These findings imply that substrate inhibitions limit the removal of aromatic hydrocarbons, particularly when the available nitrogen in the packing media is low. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Recommanded Product: 763-69-9).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Recommanded Product: 763-69-9

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Influence of Freezing and Different Drying Methods on Volatile Profiles of Strawberry and Analysis of Volatile Compounds of Strawberry Commercial Jams was written by Abouelenein, Doaa;Mustafa, Ahmed M.;Angeloni, Simone;Borsetta, Germana;Vittori, Sauro;Maggi, Filippo;Sagratini, Gianni;Caprioli, Giovanni. And the article was included in Molecules in 2021.HPLC of Formula: 2198-61-0 The following contents are mentioned in the article:

Strawberry is the most consumed berry fruit worldwide due to its unique aroma and flavor. Drying fruits to produce a powder represents one of the possible conservation methods to extend their shelf-life. The aim of the present study was to compare the influence of freezing and different drying methods on the volatile profile of strawberry using the HS-SPME/GC-MS method, in addition to anal. of strawberry jam volatiles. A total of 165 compounds were identified, accounting for 85.03-96.88% of the total volatile compositions Results and PCA showed that freezing and each drying process affected the volatile profile in a different way, and the most remarkable representative differential volatiles were Et hexanoate, hexyl acetate, (E)-2-hexenyl acetate, mesifurane, (E)-nerolidol, γ-decalactone, 1-hexanol, and acetoin. Shade air-dried, frozen, freeze-dried, and oven-dried 45°C samples retained more of the fruity and sweet aromas of strawberry, representing more than 68% of the total aroma intensity according to the literature. In contrast, the microwave-drying method showed drastic loss of fruity esters. Strawberry jams demonstrated complete destruction of esters and alcs. in most jams, while terpenes were significantly increased. These findings help better understand the aroma of strawberry and provide a guide for the effects of drying, freezing, and jam processing. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0HPLC of Formula: 2198-61-0).

Isopentyl hexanoate (cas: 2198-61-0) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.HPLC of Formula: 2198-61-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Identification of age-markers based on profiling of Baijiu volatiles over a two-year maturation period: Case study of Lu-flavor Baijiu was written by Zhang, Xiao-Juan;Meng, Lian-Jun;Lu, Zhen-Ming;Chai, Li-Juan;Wang, Song-Tao;Shi, Jin-Song;Shen, Cai-Hong;Xu, Zheng-Hong. And the article was included in LWT–Food Science and Technology in 2021.Category: esters-buliding-blocks The following contents are mentioned in the article:

Baijiu is a highly-valued traditional Chinese distilled alc. liquor and maturation markedly improves its sensory qualities and market value. Identification of age-markers is challenging because of the complexity of the endogenous chem. profile and the absence of exogenous components added during maturation. Here, freshly-distilled raw Lu-flavor Baijiu samples were stored for two years and non-targeted screening for age-markers based on the volatile profile characterized by solid-phase micro-extraction assisted GC-MS. The resulting volatile datasets were analyzed by partial least-squares discriminant anal., Spearman’s correlation and Random-forest decision-tree, to identify potential age-markers. The contents of long chain fatty acid Et esters varied the most during maturation, mostly being absent in freshly-distilled Baijiu, but appearing at different times. Similar behavior was observed in bottled samples matured up to four years. In addition, a slight increase in short/medium chain fatty acid ester content was observed Unsupervised PCA anal., applied only to the fatty acid Et ester dataset, was able to distinguish between bottled Baijiu samples matured for one, two, three, or four years. These age-markers may help establish a reliable model for verifying the maturation time of Lu-flavor Baijiu. This screening approach should be adaptable to other alc. liquors, for quality assessment and authenticity testing. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Category: esters-buliding-blocks).

Isopentyl hexanoate (cas: 2198-61-0) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Category: esters-buliding-blocks

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Dataset on analytical characterization of bioactive components from Azadirachta indica, Canna indica, Magnifera indica and Moringa oleifera leaf extracts and their applications in nanoparticles biosynthesis was written by Bolade, Oladotun P.;Williams, Akan B.;Benson, Nsikak U.. And the article was included in Data in Brief in 2021.Quality Control of Isopropylisothiocyanate The following contents are mentioned in the article:

This paper presents data on the bioactive phytoconstituents in Azadirachta indica, Canna indica, Magnifera indica, and Moringa oleifera analyzed using quant. and qual. phytochem. screening methods, Fourier Transform IR Spectroscopy and Gas Chromatog.-Mass Spectrometry (GC-MS). Extracts were prepared in water, ethanol (EtOH) and EtOH:water mix. Identification of bioactive components was based on their spectral data and retention times compared with National Institute of Standards and Technol. (NIST) mass spectral library. The most prominent absorption bands indicated are O-H stretching vibration, C-H stretch of polyols, aromatic C=C stretching vibration, O-H stretch of polyols, C-H stretching vibration and C-OH polyols. The GC-MS characterization for A. indica showed the presence of phenols, organic acids and carbohydrates with cannabidiol as the most abundant. Crude extracts of M. oleifera showed six phenolic compounds with 4-hydroxy-bezoic acid and cannabidiol present prominently. Six phenolic phytoconstituents were identified in M. indica extracts with 1,2,3-benzenetriol as the major polyphenolic compound Biogenic iron oxide nanoparticles were synthesized and the formation was confirmed using a UV spectrometer (UV-3000 ORI, Germany) between 200 and 800 nm spectral range. X-ray diffraction (XRD) characterization of the biosynthesized iron oxide nanoparticles was carried out using Empyrean, Malvern PanAnal. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Quality Control of Isopropylisothiocyanate).

Isopropylisothiocyanate (cas: 2253-73-8) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Quality Control of Isopropylisothiocyanate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Dataset on analytical characterization of bioactive components from Azadirachta indica, Canna indica, Magnifera indica and Moringa oleifera leaf extracts and their applications in nanoparticles biosynthesis was written by Bolade, Oladotun P.;Williams, Akan B.;Benson, Nsikak U.. And the article was included in Data in Brief in 2021.Recommanded Product: 2253-73-8 The following contents are mentioned in the article:

This paper presents data on the bioactive phytoconstituents in Azadirachta indica, Canna indica, Magnifera indica, and Moringa oleifera analyzed using quant. and qual. phytochem. screening methods, Fourier Transform IR Spectroscopy and Gas Chromatog.-Mass Spectrometry (GC-MS). Extracts were prepared in water, ethanol (EtOH) and EtOH:water mix. Identification of bioactive components was based on their spectral data and retention times compared with National Institute of Standards and Technol. (NIST) mass spectral library. The most prominent absorption bands indicated are O-H stretching vibration, C-H stretch of polyols, aromatic C=C stretching vibration, O-H stretch of polyols, C-H stretching vibration and C-OH polyols. The GC-MS characterization for A. indica showed the presence of phenols, organic acids and carbohydrates with cannabidiol as the most abundant. Crude extracts of M. oleifera showed six phenolic compounds with 4-hydroxy-bezoic acid and cannabidiol present prominently. Six phenolic phytoconstituents were identified in M. indica extracts with 1,2,3-benzenetriol as the major polyphenolic compound Biogenic iron oxide nanoparticles were synthesized and the formation was confirmed using a UV spectrometer (UV-3000 ORI, Germany) between 200 and 800 nm spectral range. X-ray diffraction (XRD) characterization of the biosynthesized iron oxide nanoparticles was carried out using Empyrean, Malvern PanAnal. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Recommanded Product: 2253-73-8).

Isopropylisothiocyanate (cas: 2253-73-8) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Recommanded Product: 2253-73-8

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Poly(ethylene) glycol-modified, amphiphilic, siloxane-polyurethane coatings and their performance as fouling-release surfaces was written by Galhenage, Teluka P.;Webster, Dean C.;Moreira, Augusto M. S.;Burgett, Ryan J.;Stafslien, Shane J.;Vanderwal, Lyndsi;Finlay, John A.;Franco, Sofia C.;Clare, Anthony S.. And the article was included in Journal of Coatings Technology and Research in 2017.COA of Formula: C7H14O3 The following contents are mentioned in the article:

Amphiphilic siloxane-polyurethane (AmSiPU) coatings were prepared using a series of polyisocyanate prepolymers modified with polydimethyl siloxane (PDMS) and poly(ethylene glycol) (PEG). Fouling-release performance of the AmSiPU coatings was evaluated through laboratory biol. assays using several representative marine organisms. First, polyisocyanate prepolymers with compositional variation in PDMS and PEG were synthesized and characterized using Fourier transform IR spectroscopy (FTIR) and isocyanate titrations Then, the prepolymers were incorporated into coatings. Surface wettability of the coatings was evaluated using contact angle and surface energy measurements. Coatings surfaces were also characterized using attenuated total reflectance Fourier transform IR spectroscopy (ATR-FTIR), XPS, and at. force microscopy (AFM). ATR-FTIR and XPS experiments revealed that both PDMS and PEG moieties were present on the surface suggesting amphiphilic character. AFM phase images show microphase separation AmSiPU coatings show excellent fouling-release performance toward bacteria (Cellulophaga lytica), the diatoms (Navicula incerta), and the green algae (Ulva linza), demonstrating comparable or superior performance to many com. amphiphilic fouling-release coatings. Despite the incorporation of hydrophilic PEG, AmSiPU coatings show good macrofouling release which is often challenging with amphiphilic coating systems. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9COA of Formula: C7H14O3).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.COA of Formula: C7H14O3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Assessing Volatiles in Three Chinese Dwarf Cherry Cultivars during Veraison and Maturation Using Headspace-Solid Phase Microextraction with Gas Chromatography-Mass Spectrometry was written by Cui, Qingyu;Ye, Liqin;Guo, Chang-e;Li, Weidong. And the article was included in ACS Omega in 2020.Recommanded Product: 2198-61-0 The following contents are mentioned in the article:

Chinese dwarf cherry is a native shrub in northwest China with a rich and unique fruit aroma. This study aims to determine the changes in volatile profiles during the maturation period, which provides a theor. basis for the optimal harvest times and the breeding of aroma-rich varieties. The variation in the production of 164 volatile compounds from three Chinese dwarf cherry cultivars, namely, “Jing’ou 1”, “Jing’ou 2”, and “Jing’ou 3”, were investigated by headspace-solid phase microextraction (HS-SPME)-GC-MS. These volatiles mainly constituted alcs., carbonyls, esters, terpenoids, and hydrocarbons. Their maturation process could be divided into three stages, namely prophase, metaphase, and anaphase. Prophase contained an abundance of hydrocarbons and carbonyls, primarily benzaldehyde being dominant among all volatiles. During metaphase, volatiles remained at a low level of abundance and diversity. Anaphase coincided with full maturation and was associated with esters and terpenoids; in particular, “Jing’ou 3” presented more compound diversity and a high level of acetate esters. The periods including the week prior to veraison and the week during maturation were particularly critical in volatile formation in Chinese dwarf cherries. This study reveals that the low level or lack of hexanal might be one of the distinctive characteristics separating Chinese dwarf cherries from other Cerasus or Rosaceae fruits. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Recommanded Product: 2198-61-0).

Isopentyl hexanoate (cas: 2198-61-0) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Recommanded Product: 2198-61-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics