The odor fingerprint of Pollygonati Rhizoma samples with different mildewing degrees was analyzed and the relationship between the odor variation and the mildewing degree was explored. A fast discriminant model was established according to the response intensity of electronic nose. The α-FOX3000 electronic nose was applied to analyze the odor fingerprint of Pollygonati Rhizoma samples with different mildewing degrees and the radar map was used to analyze the main contributors among the volatile organic compounds. The feature data were processed and analyzed by partial least squares discriminant analysis(PLS-DA), K-nearest neighbor(KNN), sequential minimal optimization(SMO), random forest(RF) and naive Bayes(NB), respectively. According to the radar map of the electronic nose, the response values of three sensors, namely T70/2, T30/1, and P10/2, increased with the mildewing, indicating that the Pollygonati Rhizoma produced alkanes and aromatic compounds after the mildewing. According to PLS-DA model, Pollygonati Rhizoma samples of three mildewing degrees could be well distinguished in three areas. Afterwards, the variable importance analysis of the sensors was carried out and then five sensors that contributed a lot to the classification were screened out: T70/2, T30/1, PA/2, P10/1 and P40/1. The classification accuracy of all the four models(KNN, SMO, RF, and NB) was above 90%, and KNN was most accurate(accuracy: 97.2%). Different volatile organic compounds were produced after the mildewing of Pollygonati Rhizoma, and they could be detected by electronic nose, which laid a foundation for the establishment of a rapid discrimination model for mildewed Pollygonati Rhizoma. This paper shed lights on further research on change pattern and quick detection of volatile organic compounds in moldy Chinese herbal medicines.
Electronic Nose ; Odorants/analysis* ; Volatile Organic Compounds/analysis* ; Bayes Theorem ; Drugs, Chinese Herbal/analysis* ; Discriminant Analysis

Galli Gigerii Endothelium Corneum(GGEC) is commonly used for the clinical treatment of indigestion, vomiting, diarrhea, and infantile malnutrition with accumulation. In recent decades, omnivorous domestic chickens, the original source of GGEC, has been replaced by broilers, which may lead to significant changes in the quality of the yielding GGEC. Through subjective and objective sensory evaluation, biological evaluation, and chemical analysis, this study compared the odor and quality between GGEC derived from domestic chickens and that from broilers. The odor intensity between them was compared by odor profile analysis and it was found that the fishy odor of GGEC derived from domestic chickens was significantly weaker than that of GGEC from broilers. Headspace-solid phase microextraction-gas chromatography-triple quadrupole tandem mass spectrometry(HS-SPME/GC-QQQ-MS/MS) suggested that the overall odor-causing chemicals were consistent with the fishy odor-causing chemicals. According to the odor activity va-lue and the orthogonal partial least squares discriminant analysis(OPLS-DA) result, dimethyl trisulfide, 2-methoxy-3-isobutylpyrazine, and 2-methylisoborneol were responsible for the fishy odor(OAV≥1) and the content of fishy odor-causing chemicals in GGEC derived from broilers was 1.12-2.13 folds that in GGEC from domestic chickens. The average pepsin potency in GGEC derived from broilers was 15.679 U·mg~(-1), and the corresponding figure for the medicinal from domestic chickens was 26.529 U·mg~(-1). The results of pre-column derivatization reverse-phase high-performance liquid chromatography(RP-HPLC) assay showed that the content of total amino acids and digestion-promoting amino acids in domestic chickens-derived GGEC was 1.12 times and 1.15 times that in GGEC from broilers, and the bitter amino acid content was 1.21 times folds that of the latter. In conclusion, GGEC derived from domestic chickens had weaker fishy odor, stronger enzyme activity, higher content of digestion-promoting amino acids, and stronger bitter taste than GGEC from broilers. This study lays a scientific basis for studying the quality variation of GGEC and provides a method for identifying high-quality GGEC. Therefore, it is of great significance for the development and cultivation of GGEC as both food and medicine and breeding of corresponding varieties.
Animals ; Odorants/analysis* ; Chickens ; Gas Chromatography-Mass Spectrometry/methods* ; Tandem Mass Spectrometry ; Solid Phase Microextraction ; Amino Acids ; Endothelium/chemistry* ; Volatile Organic Compounds/analysis*

Despite the distinctive characteristics and remarkable efficacy, animal medicine is stenchy, which decreases the comp-liance of patients. At the moment, the research on the method for deodorizing animal medicines lags behind. To be specific, the components related to the odor and the basic properties transformation of the components are unclear and there is a lack of specific deodorizing method. This study aims to clarify the main components related to the stench of animal medicine, such as aldehydes, amines, trimethylamines and sulfur compounds, and their basic properties, and to explore their metabolism and transformation in vivo and in vitro, which is expected to serve as a reference for the research on deodorization of animal medicine and development of new techniques.
Animals ; Odorants ; Aldehydes

Aromatic compounds make up a large part of fragrances and are traditionally produced by chemical synthesis and direct extraction from plants. Chemical synthesis depends on petroleum resources and has disadvantages such as causing environment pollutions and harsh reaction conditions. Due to the low content of aromatic compounds in plants and the low yield of direct extraction, plant extractions require large amounts of plant resources that occupy arable land. In recent years, with the development of metabolic engineering and synthetic biology, microbial synthesis of aromatic compounds from renewable resources has become a promising alternative approach to traditional methods. This review describes the research progress on the synthesis of aromatic fragrances by model microorganisms such as Escherichia coli or yeast, including the synthesis of vanillin through shikimic acid pathway and the synthesis of raspberry ketone through polyketide pathway. Moreover, this review highlights the elucidation of native biosynthesis pathways, the construction of synthetic pathways and metabolic regulation for the production of aromatic fragrances by microbial fermentation.
Biosynthetic Pathways ; Metabolic Engineering ; Odorants ; Shikimic Acid ; Synthetic Biology

This study adopted headspace-gas chromatography-mass spectrometry(HS-GC-MS) and electronic nose to detect volatile components from Myristicae Semen samples with varying degrees of mildew, aiming at rapidly identifying odor changes and substance basis of Myristicae Semen mildew. The experimental data were analyzed by electronic nose and principal component analysis(PCA). The results showed that Myristicae Semen samples were divided into the following three categories by electronic nose and PCA: mildew-free samples, slightly mildewy samples, and mildewy samples. Myristicae Semen samples with different degrees of mildew greatly varied in volatile components. The volatile components in the samples were qualitatively and quantitatively detected by HS-GC-MS, and 59 compounds were obtained. There were significant differences in the composition and content in Myristicae Semen samples with different degrees of mildew. The PCA results were the same as those by electronic nose. Among them, 3-crene, D-limonene, and other terpenes were important indicators for the identification of mildew. Bicyclo[3.1.0]hexane, 4-methylene-1-(1-methylethyl)-, terpinen-4-ol, and other alcohols were key substances to distinguish the degree of mildew. In the later stage of mildew, Myristicae Semen produced a small amount of hydroxyl and aldehyde compounds such as acetaldehyde, 2-methyl-propionaldehyde, 2-methyl-butyraldehyde, and formic acid, which were deduced as the material basis of the mildew. The results are expected to provide a basis for the rapid identification of Myristicae Semen with different degrees of mildew, odor changes, and the substance basis of mildew.
Electronic Nose ; Gas Chromatography-Mass Spectrometry ; Odorants/analysis* ; Semen/chemistry* ; Solid Phase Microextraction ; Volatile Organic Compounds/analysis*

The processing of Chinese herb medicine( PCHM) is the premise and necessity of treating diseases in traditional Chinese medicine( TCM). After processing,Chinese herbal medicine can achieve the effects of correcting odor,inducing channel tropism,changing drug properties and reducing toxicity. As the most important part of TCM theory system,Chinese medicine property,involving four odors and five flavors,ascending and descending,channel tropism,toxicity and side effects. In recent years,with the development of modern science and technology,many researches on the changes of properties of Chinese herb medicines by PCHM have been reported. In this paper,the researches in four aspects of processing method,chemical composition,medicinal effect and biological effect on properties changes by PCHM were reviewed,so as to discuss the modern research ideas and technologies,and explain the importance of the increase of clinical efficacy of TCM through property changes by PCHM. In the end,the future research ideas and cutting-edge technologies were discussed to make the studies on property changes by PCHM more systematic and deeper.
Drug-Related Side Effects and Adverse Reactions ; Drugs, Chinese Herbal/toxicity* ; Medicine, Chinese Traditional ; Odorants ; Taste ; Technology, Pharmaceutical

The quality of honeysuckle has always been an important factor in industrial development. Flowering is one of the elements for the variation of the effective components in honeysuckle. We can conveniently recognize whether the commodity is mixed with blossomed honeysuckle in the form of medicinal material. However,it is hard to identify whether the products are mixed with blossomed honeysuckle in the form of powdersince visual identification traits are missing. Therefore,this study aims to seek an effective method of odor-based distinguish for identifying the quality of honeysuckle powder in different ratios by using Heracles Ⅱ ultra-fast gas phase electronic nose.The powdered samples were prepared with flower buds and fully blooming flowers in different proportion. Gas chromatograms of the powder were obtained by HeraclesⅡ ultra-fast gas phase electronic nose. Through analyzing the data of chromatograms,we have concluded that the qualitative results of the prepared powder were almost the same,and there existed differences in the components content. Meanwhile,the hexanal odor appeared to be the critical factor in identifying honeysuckle powder quality among the flavor of all possible compounds. Also,we have applied PCA,DFA and CQ to identify and classify the variety of the powder based on the chromatogram data. Finally,it is realized that the powder was rapidly identified and classified into three grades based on the proportion of flowering honeysuckle. The predicted concentration value for the first class is less than 3,the value of is not less than 3 and less than 5 for the second class,and more than 5 for the third class. In summary,the results obtained by the study suggest that Heracles Ⅱ ultra-fast gas phase electronic nose analysis can be used as a rapid identification method for the quality of honeysuckle powder. At the same time,it can provide a reference for the quality classification of honeysuckle based on flowering degrees.
Electronic Nose ; Flowers/chemistry* ; Lonicera/chemistry* ; Odorants/analysis* ; Plant Preparations/analysis* ; Powders/analysis* ; Quality Control

This article aims to identify four commonly applied herbs from Curcuma genus of Zingiberaceae family,namely Curcumae Radix( Yujin),Curcumae Rhizoma( Ezhu),Curcumae Longae Rhizoma( Jianghuang) and Wenyujin Rhizoma Concisum( Pianjianghuang). The odor fingerprints of those four herbal medicines were collected by electronic nose,respectively. Meanwhile,XGBoost algorithm was introduced to data analysis and discriminant model establishment,with four indexes for performance evaluation,including accuracy,precision,recall,and F-measure. The discriminant model was established by XGBoost with positive rate of returning to 166 samples in the training set and 69 samples in the test set were 99. 39% and 95. 65%,respectively. The top four of the contribution to the discriminant model were LY2/g CT,P40/1,LY2/Gh and LY2/LG,the least contributing sensor was T70/2. Compared with support vector machine,random forest and artificial neural network,XGBoost algorithms shows better identification capacity with higher recognition efficiency. The accuracy,precision,recall and F-measure of the XGBoost discriminant model forecast set were 95. 65%,95. 25%,93. 07%,93. 75%,respectively. The superiority of XGBoost in the identification of Curcuma herbs was verified. Obviously,this new method could not only be suitable for digitization and objectification of traditional Chinese medicine( TCM) odor indicators,but also achieve the identification of different TCM based on their odor fingerprint in electronic nose system. The introduction of XGBoost algorithm and more excellent algorithms provide more ideas for the application of electronic nose in data mining for TCM studies.
Algorithms ; Curcuma/classification* ; Discriminant Analysis ; Drugs, Chinese Herbal/analysis* ; Electronic Nose ; Medicine, Chinese Traditional ; Odorants/analysis* ; Plants, Medicinal/classification*

BACKGROUND: Bacterial vaginosis (BV) is a very common gynecologic infection associated with a vast number of complications both in gynecologic and obstetric patients. One of the major concerns in its treatment is a high recurrence rate which was multifactorial and the choice of the suitable antimicrobial is important to decrease the treatment failure.

METHODS: All gynecologic patients aged 18 years old and above in a tertiary hospital diagnosed with bacterial vaginosis according to Amsel's criteria. A total of 80 patients were randomly assigned into two groups; one group to receive oral Probiotics (Protexin) while the other group to receive Metronidazole. The patients will be followed up accordingly on Days 1, 3, 7 and 30 and will be graded according to Amsel's criteria. The primary endpoint of the study is the treatment of bacterial vaginosis based on the mentioned criteria. (Anukam, 2006)

RESULTS: The results showed that there was a significant improvement in the character of the vaginal discharge based on the Amsels criteria on Day 1 of treatment for the Metronidazole group (0/40; 100%, p value <0.001) and Day 3 for Oral Lactobacillus arms. (7/40; 20%, p value 0.01). The Metronidazole arm showed a significant improvement in the fishy odor on vaginal examination with addition of 10% KOH on day 1 (0/40; 100%, p value <0.001) and Day 3 for oral Lactobacilus (0/40; 100%, p value 1.00). Then vaginal pH was noted to be more acidic in the Metronidazole compared to the Protexin arm on Day 1 of treatment (0/40; 0% and 40/40; 100% p value

CONCLUSION: The Metronidazole remains to be the standard treatment for Bacterial vaginosis. There was also faster recovery and clinical improvement in the character of the vaginal discharge, amount and smell based on the Amsel's criteria as early as Day 1 of follow-up; however, there was a small number of population with poor compliance resulting to higher recurrence rate which was evident on the 30 th day of follow-up. The oral lactobacillus rhamnosus showed advantage over Metronidazole due to lower recurrence rate of BV as noted on Day 30 of follow up.

Human ; Female ; Aged ; Middle Aged ; Adult ; Pregnancy ; Vaginosis, Bacterial ; Lactobacillus Rhamnosus ; Metronidazole ; Lactobacillus ; Probiotics ; Anti-infective Agents ; Gynecological Examination ; Odorants ; Smell ; Vaginal Discharge

BACKGROUND: Bacterial vaginosis (BV) is a very common gynecologic infection associated with a vast number of complications both in gynecologic and obstetric patients. One of the major concerns in its treatment is a high recurrence rate which was multifactorial and the choice of the suitable antimicrobial is important to decrease the treatment failure.

METHODS: All gynecologic patients aged 18 years old and above in a tertiary hospital diagnosed with bacterial vaginosis according to Amsel's criteria. A total of 80 patients were randomly assigned into two groups; one group to receive oral Probiotics (Protexin) while the other group to receive Metronidazole. The patients will be followed up accordingly on Days 1, 3, 7 and 30 and will be graded according to Amsel's criteria. The primary endpoint of the study is the treatment of bacterial vaginosis based on the mentioned criteria. (Anukam, 2006)

RESULTS: The results showed that there was a significant improvement in the character of the vaginal discharge based on the Amsels criteria on Day 1 of treatment for the Metronidazole group (0/40; 100%, p value <0.001) and Day 3 for Oral Lactobacillus arms. (7/40; 20%, p value 0.01). The Metronidazole arm showed a significant improvement in the fishy odor on vaginal examination with addition of 10% KOH on day 1 (0/40; 100%, p value <0.001) and Day 3 for oral Lactobacilus (0/40; 100%, p value 1.00). Then vaginal pH was noted to be more acidic in the Metronidazole compared to the Protexin arm on Day 1 of treatment (0/40; 0% and 40/40; 100% p value

CONCLUSION: The Metronidazole remains to be the standard treatment for Bacterial vaginosis. There was also faster recovery and clinical improvement in the character of the vaginal discharge, amount and smell based on the Amsel's criteria as early as Day 1 of follow-up; however, there was a small number of population with poor compliance resulting to higher recurrence rate which was evident on the 30 th day of follow-up. The oral lactobacillus rhamnosus showed advantage over Metronidazole due to lower recurrence rate of BV as noted on Day 30 of follow up.

Human ; Female ; Aged ; Middle Aged ; Adult ; Pregnancy ; Vaginosis, Bacterial ; Lactobacillus Rhamnosus ; Metronidazole ; Lactobacillus ; Probiotics ; Anti-infective Agents ; Gynecological Examination ; Odorants ; Smell ; Vaginal Discharge