Volatile profiles of cooked organic sweetpotato by electronic nose

2021 ◽  
Author(s):  
Ramasamy Ravi ◽  
Dilip Nandwani ◽  
Sochinwechi Nwosisi
Keyword(s):  
Electronic Nose ◽  
Volatile Profiles

Effect of the two drying approaches on the volatile profiles of button mushroom (Agaricus bisporus) by headspace GC–MS and electronic nose

LWT ◽  
2016 ◽  
Vol 72 ◽  
pp. 343-350 ◽  
Author(s):  
Fei Pei ◽  
Wenjian Yang ◽  
Ning Ma ◽  
Yong Fang ◽  
Liyan Zhao ◽  
...  
Keyword(s):  
Electronic Nose ◽  
Agaricus Bisporus ◽  
Button Mushroom ◽  
Volatile Profiles ◽  
Headspace Gc

scholarly journals Aroma Volatile Profiles from Ripe Tomatoes are Influenced by Physiological Maturity at Harvest: An Application for Electronic Nose Technology

1998 ◽  
Vol 123 (6) ◽  
pp. 1094-1101 ◽  
Author(s):  
Fernando Maul ◽  
Steven A. Sargent ◽  
Murat O. Balaban ◽  
Elizabeth A. Baldwin ◽  
Donald J. Huber ◽  
...  
Keyword(s):  
Electronic Nose ◽  
Output Analysis ◽  
Mahalanobis Distances ◽  
Physiological Maturity ◽  
Ethylene Treatment ◽  
Volatile Profiles ◽  
Profile Changes ◽  
Exogenous Ethylene ◽  
Multivariate Discriminant ◽  
Electronic Nose Technology

The effect of physiological maturity at harvest on ripe tomato (Lycopersicon esculentum Mill.) volatile profiles was studied using ripening response time (in days) to 100 μL·L-1 exogenous ethylene treatment as a tool to separate immature-green from mature-green fruit. Electronic nose (EN) sensor array and gas chromatography (GC) analyses were used to document volatile profile changes in tomatoes that required a 1-, 3-, or 5-day ethylene treatment to reach the breaker stage. EN output analysis using multivariate discriminant and canonical analyses classified intact tomato and whole tomato homogenate samples that required 3 or 5 days of ethylene treatment as significantly different (P < 0.01) from those that required only 1 day. The GC aroma profiles from whole tomato homogenate showed that 1-day fruit had significantly higher levels (P < 0.05) of 1-penten-3-one, cis-3-hexenal, 6-methyl-5-hepten-2-one, 2-isobutylthiazole, and geranylacetone when compared to 5-day fruit. Analysis of excised tomato tissues showed that pericarp (including columnella) produced an average 219% greater concentration of the 16 aroma volatiles quantified by GC when compared to locular gel (442 and 203 μL·L-1, respectively). EN analysis concurred with GC by showing greater average Mahalanobis distance between pericarp tissue groupings when compared to locular gel groupings (78.25 and 12.33 units, respectively). Pericarp tissue from the 5-day ethylene treatment showed significantly lower levels of 1-penten-3-one, trans-2-heptenal, 6-methyl-5-hepten-2-one, 2-isobutylthiazole, geranylacetone, and β-ionone compared to the 1- and 3-day treatments, Similarly, locular gel from the 3- and 5-day ethylene treatments had significantly lower levels of 1-penten-3-one, 2-isobutylthiazole, and 1-nitro-2-phenylethane compared to 1-day samples. cis-3-Hexenol in locular gel was the only volatile compound that showed significantly higher levels with increasing ethylene treatment. EN analysis showed greater Mahalanobis distances between 1- and 3-day ethylene samples than between 3- and 5-day ethylene samples (32.09 and 12.90, 24.14 and 6.52, 116.31 and 65.04, and 15.74 and 13.28 units, for intact tomato, whole tomato, pericarp, and locular gel homogenate, respectively).

scholarly journals HS–SPME–GC–MS and Electronic Nose Reveal Differences in the Volatile Profiles of Hedychium Flowers

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5425
Author(s):  
Yiwei Zhou ◽  
Farhat Abbas ◽  
Zhidong Wang ◽  
Yunyi Yu ◽  
Yuechong Yue ◽  
...  
Keyword(s):  
Volatile Compounds ◽  
Electronic Nose ◽  
Ornamental Plants ◽  
Principal Component ◽  
Precise Determination ◽  
Gas Chromatography Mass Spectrometry ◽  
Pollinator Attraction ◽  
Floral Fragrance ◽  
Volatile Profiles ◽  
Floral Volatile

Floral fragrance is one of the most important characteristics of ornamental plants and plays a pivotal role in plant lifespan such as pollinator attraction, pest repelling, and protection against abiotic and biotic stresses. However, the precise determination of floral fragrance is limited. In the present study, the floral volatile compounds of six Hedychium accessions exhibiting from faint to highly fragrant were comparatively analyzed via gas chromatography–mass spectrometry (GC–MS) and Electronic nose (E-nose). A total of 42 volatile compounds were identified through GC–MS analysis, including monoterpenoids (18 compounds), sesquiterpenoids (12), benzenoids/phenylpropanoids (8), fatty acid derivatives (2), and others (2). In Hedychium coronarium ‘ZS’, H. forrestii ‘Gaoling’, H. ‘Jin’, H. ‘Caixia’, and H. ‘Zhaoxia’, monoterpenoids were abundant, while sesquiterpenoids were found in large quantities in H. coccineum ‘KMH’. Hierarchical clustering analysis (HCA) divided the 42 volatile compounds into four different groups (I, II, III, IV), and Spearman correlation analysis showed these compounds to have different degrees of correlation. The E-nose was able to group the different accessions in the principal component analysis (PCA) corresponding to scent intensity. Furthermore, the pattern-recognition findings confirmed that the E-nose data validated the GC–MS results. The partial least squares (PLS) analysis between floral volatile compounds and sensors suggested that specific sensors were highly sensitive to terpenoids. In short, the E-nose is proficient in discriminating Hedychium accessions of different volatile profiles in both quantitative and qualitative aspects, offering an accurate and rapid reference technique for future applications.

scholarly journals Volatile-Olfactory Profiles of cv. Arbequina Olive Oils Extracted without/with Olive Leaves Addition and Their Discrimination Using an Electronic Nose

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ítala M. G. Marx ◽  
Nuno Rodrigues ◽  
Ana C. A. Veloso ◽  
Susana Casal ◽  
José A. Pereira ◽  
...  
Keyword(s):  
Electronic Nose ◽  
Internal Standard ◽  
Total Content ◽  
Olive Leaves ◽  
Lipoxygenase Pathway ◽  
Olive Oils ◽  
Volatile Profiles ◽  
Practical Tool ◽  
Leave One Out ◽  
Fold Cross Validation

Oils from cv. Arbequina were industrially extracted together with olive leaves of cv. Arbequina or Santulhana (1%, w/w), and their olfactory and volatile profiles were compared to those extracted without leaves addition (control). The leaves incorporation resulted in green fruity oils with fresh herbs and cabbage olfactory notes, while control oils showed a ripe fruity sensation with banana, apple, and dry hay grass notes. In all oils, total volatile contents varied from 57.5 to 65.5 mg/kg (internal standard equivalents), being aldehydes followed by esters, hydrocarbons, and alcohols the most abundant classes. No differences in the number of volatiles were observed. The incorporation of cv. Arbequina or Santulhana leaves significantly reduced the total content of alcohols and esters (minus 37–56% and 10–13%, respectively). Contrary, cv. Arbequina leaves did not influence the total content of aldehydes or hydrocarbons, while cv. Santulhana leaves promoted a significant increase (plus 49 and 10%, respectively). Thus, a leaf-cultivar dependency was observed, tentatively attributed to enzymatic differences related to the lipoxygenase pathway. Olfactory or volatile profiles allowed the successful unsupervised differentiation of the three types of studied cv. Arbequina oils. Finally, a lab-made electronic nose was applied to allow the nondestructive discrimination of cv. Arbequina oils extracted with or without the incorporation of olive leaves (100% and 99 ± 5% of correct classifications for leave-one-out and repeated K-fold cross-validation variants), being a practical tool for ensuring the label correctness if future commercialization is envisaged. Moreover, this finding also strengthened that olive oils extracted with or without olive leaves incorporation possessed quite different olfactory patterns, which also depended on the cultivar of the olive leaves.

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