Abstract BACKGROUND Flavor plays a critical role in defining sensory and consumer acceptance of dried pepper, it can be affected by temperature moisture content during hot air drying (HAD). Thus, headspace‐gas chromatography‐ion mobility spectrometry (HS‐GC‐IMS) was used to analyze changes volatile compounds pepper the HAD process with different temperatures. RESULTS A total 45 flavor were identified, including 11 esters, aldehydes, nine alcohols, five ketones, three furans, acids, two...

Citri Reticulatae Pericarpium (CRP) is a kind of important traditional Chinese medicine and food. Sulfur-fumigation may induce chemical transformation CRPs with no difference in appearance, leading to harmful effects on human health. In this paper, an accurate nondestructive detection method sulfur-fumigated was established based portable near-infrared spectroscopy (NIRS) chemometrics. 389 normal 350 were collected, while the spectra outer skin inner capsule obtained directly without...

Terahertz spectroscopy has drawn great interest for the detection and characterization of biological matter, but its limited sensitivity to biomolecules with weak changes in dielectric properties varying concentration hinders potential bio-sensing applications. Here, a novel terahertz sensor was developed enhancing ability detect based on two electromagnetically induced transparency (EIT) metamaterials coupled gold nanoparticles (AuNPs) integrated biomolecules. The electrostatic interaction...

Abstract A simple and nondestructive method for the analysis of soluble solid content in citrus was established using portable visible to near‐infrared spectroscopy (Vis/NIRS) reflectance mode combination with appropriate chemometric methods. The spectra were obtained directly by Vis/NIRS without destroying samples. Outlier detection performed leave‐one‐out cross‐validation (LOOCV) 3σ criterion, calibration models partial least squares (PLS) algorithm. Besides, different data pretreatment...

Radiation at terahertz frequencies can be used to analyze the structural dynamics of water and biomolecules, but applying technique aqueous solutions tissues remains challenging since radiation is strongly absorbed by water. While this absorption enables certain analyses, such as structure its interactions with biological solutes, it limits thickness samples that analyzed, drowns out weaker signals from biomolecules interest. We present a method for analyzing water-rich via time-domain...

Terahertz metamaterials have shown promises in biomolecules detection, however, aqueous solvents such as blood serum strongly absorb the terahertz waves, interfering with detection. To avoid interference, an ultrathin, flexible, biogel‐based metamaterial that can specifically detect transmission of waves through solution is proposed and demonstrated. The glucose water be detected a sensitivity 0.0446 dL mg −1 detection limit 1.64 , well human serum. detects sweat part wearable device....

Fermented pepper is one of the traditional Chinese fermented vegetables. The production mainly relies on fermentation by natural microorganisms. This system a unique and dynamic microecological environment, involved microbial communities are very complex. In this study, 454 pyrosequencing was first used to investigate fungal in fresh different phases. results showed that (sample M_0) were more abundant than later Taxa proportions >0.01% could be assigned 21 genera. >1% Trichosporon 24.11%,...

This study optimized the headspace solid phase microextraction (HS-SPME) conditions for analysis of volatile flavor compounds Chinese south stinky tofu brine by gas chromatography-mass spectrometry (GC-MS). The optimum HS-SPME established were as follows: polar column CD-WAX, white 85 μm polyella extractor, extraction temperature 60 °C, equilibrium time 20 min, 40 min. Under these conditions, a total 63 in five brines identified. offensive odor may be derived from some such phenol, p-cresol,...

Intensive study of the metabolome during Douchi fermentation can provide new knowledge for optimizing process. In this work, metabolic characterization throughout Mucor racemosus was investigated using gas chromatography with time-of-flight mass spectrometry. A total 511 peaks were found, and 114 metabolites identified. The process clearly distinguished into two main phases by principal components analysis orthogonal partial least squares-discriminant analysis. All samples in score plots...

This study reports the optimization of culture conditions and medium components M9, an endophytic strain Bacillus amyloliquefaciens, which we had previously isolated from kiwifruit, evaluation its effect on kiwifruit postharvest protection against soft rot. The method one-factor-at-a-time was used to determine optimum conditions, response surface methodology applied optimize constituents. After optimization, a high rate antifungal activity (73.12% decrease in decay rate) by M9 filtrate rot...

The nondestructive characterization of citrus varieties (Egyptian sweet orange, Lane Late navel Australian and Blood orange) was developed based on near-infrared diffuse reflectance spectroscopy (NIRDRS) together with principal component analysis (PCA) Fisher linear discriminant (FLDA). An experiment for the penetration NIRDRS into peel designed effects different spectral acquisition points were investigated. Pretreatments used to eliminate interferences. As an unsupervised pattern...

Summary Undesirable substances of thermal food processing such as acrylamide ( AA ) and 5‐hydroxymethylfurfural HMF have been intensively studied in recent decades. The aim this work was to investigate the evolution mechanism contents presence various valence metal cations at concentrations asparagine–glucose model system. Three interesting phenomena were found. Firstly, first decreased then increased, whereas increased decreased, with increasing concentration; secondly, concentration for...

Citri Reticulatae Pericarpium (CRP), has been used in China for hundreds of years as a functional food and medicine. However, some short-age CRPs are disguised long-age by unscrupulous businessmen order to obtain higher profits. In this paper, rapid nondestructive method the classification different-age was established using portable near infrared spectroscopy (NIRS) diffuse reflectance mode combination with appropriate chemometric methods. The spectra outer skin inner capsule at different...

Liuyang Douchi is a kind of traditional fermented Aspergillus-type in China for excellent favor. However, studies on the microbial diversity and characterization predominate fungi are few. In present study, Illumina HiSeq sequencing was performed to reveal fluctuation characteristics during fermentation. Results showed that Staphylococcus (33.86%), Staphylococcaceae_unclassified (27.39%) Pediococcus (8.80%) were dominated bacteria, while Petromyces (74.57%), Rhizopus (10.93%) Penicillium...