Analysis of audiological outcomes of children referred from a universal newborn hearing screening program over 9 years in Beijing, China.

Universal newborn hearing screening (UNHS) and audiological diagnosis are crucial for children with congenital hearing loss (HL). The objective of this study was to analyze hearing screening techniques, audiological outcomes and risk factors among children referred from a UNHS program in Beijing. A retrospective analysis was performed in children who were referred to our hospital after failing UNHS during a 9-year period. A series of audiological diagnostic tests were administered to each case, to confirm and determine the type and degree of HL. Risk factors for HL were collected. Of 1839 cases, 53.0% were referred after only transient evoked otoacoustic emission (TEOAE) testing, 46.1% were screened by a combination of TEOAE and automatic auditory brainstem response (AABR) testing, and 1.0% were referred after only AABR testing. HL was confirmed in 55.7% of cases. Ears with screening results that led to referral experienced a more severe degree of HL than those with results that passed. Risk factors for HL were identified in 113 (6.1%) cases. The main risk factors included craniofacial anomalies (2.7%), length of stay in the neonatal intensive care unit longer than 5 days (2.4%) and birth weight less than 1500 g (0.8%). The statistical data showed that age (P < 0.001) and risk factors, including craniofacial anomalies (P < 0.001) and low birth weight (P = 0.048), were associated with the presence of HL. This study suggested that hearing screening plays an important role in the early detection of HL and that children with risk factors should be closely monitored.

Optimized concurrent hearing and genetic screening in Beijing, China: A cross-sectional study.

Concurrent screening has been proven to provide a comprehensive approach for management of congenital deafness and prevention of ototoxicity. The SLC26A4 gene is associated with late-onset hearing loss and is of great clinical concern. For much earlier detection of newborns with deafness-causing mutations in the SLC26A4 gene, the Beijing Municipal Government launched a chip for optimized genetic screening of 15 variants of 4 genes causing deafness based on a chip to screen for 9 variants of 4 genes, and 6 variants of the SLC26A4 gene have now been added. To ascertain the advantage of a screening chip including 15 variants of 4 genes, the trends in concurrent hearing and genetic screening were analyzed in 2019 and 2020. Subjects were 76,460 newborns who underwent concurrent hearing and genetic screening at 24 maternal and child care centers in Beijing from January 2019 to December 2020. Hearing screening was conducted using transiently evoked otoacoustic emissions (TEOAEs), distortion product otoacoustic emissions (DPOAE), or the automated auditory brainstem response (AABR). Dried blood spots were collected for genetic testing and 15 variants of 4 genes, namely GJB2, SLC26A4, mtDNA 12S rRNA, and GJB3, were screened for using a DNA microarray platform. The initial referral rate for hearing screening decreased from 3.60% (1,502/41,690) in 2019 to 3.23% (1,124/34,770) in 2020, and the total referral rate for hearing screening dropped form 0.57% (236/41,690) in 2019 to 0.54% (187/34,770) in 2020, indicating the reduced false positive rate of newborn hearing screening and policies to prevent hearing loss conducted by the Beijing Municipal Government have had a significant effect. Positivity according to genetic screening was similar in 2019 (4.970%, 2,072/41,690) and 2020 (4.863%,1,691/34,770), and the most frequent mutant alleles were c.235 del C in the GJB2 gene, followed by c.919-2 A > G in the SLC26A4 gene, and c.299 del AT in the GJB2 gene. In this cohort study, 71.43% (5/7) of newborns with 2 variants of the SLC26A4 gene were screened for newly added mutations, and 28.57% (2/7) of newborns with 2 variants of the SLC26A4 gene passed hearing screening, suggesting that a screening chip including 15 variants of 4 genes was superior at early detection of hearing loss, and especially in early identification of newborns with deafness-causing mutations in the SLC26A4 gene. These findings have clinical significance.

How is the Societal Perspective Defined in Health Technology Assessment? Guidelines from Around the Globe.

Some researchers have argued that the aim of an economic evaluation should be to offer guidance on resource allocation based on public interest from a societal perspective. The application of a societal perspective in health technology assessment (HTA), while common in many published studies, is not mandated in most countries, and there is limited discussion on what the societal perspective should encompass. This study aimed to systematically compare and contrast the HTA guidelines in different countries. HTA methods guidelines were identified through international HTA networks, such as the Professional Society for Health Economics and Outcomes Research (ISPOR) and Guide to Economic Analysis Research (GEAR). The respective HTA agencies were grouped into two categories: well-established and newly developed, based on the establishment date. Data extracted from the guidelines summarised the methodological details in the reference cases, including specifics on the societal perspective. The database search yielded 46 guidelines, and 65% explicitly considered the societal perspective. The maturity of these agencies is reflected in their attitudes towards the societal perspective; the societal perspective is defined in 73% of the guidelines of well-established agencies and only 56% of those of newly developed agencies. The guidelines from multipayer healthcare systems are more likely to consider the societal perspective. Although most guidelines from the well-established agencies recommend the inclusion of a societal perspective, the types of costs and consequences that should be included and the recommended approaches to valuing them are variable. The direct costs to family and carers were included in 73% of the societal perspective definitions, while non-health outcomes were considered in only 40%. Most HTA guidelines lack clear guidance on what to include under specific perspectives. Considering the recent advancements in economic evaluation methods, it is timely to rethink the role of the societal perspective in HTA guidelines and adopt a more comprehensive perspective to include all costs and consequences of healthcare services.

Comprehensive analysis of m6A-modified circRNAs in peritoneal metastasis of high grade serious carcinoma of ovary.

Purpose: High-grade serous ovarian cancer (HGSOC) remains the most lethal female cancer due to metastasis. CircRNAs are recently identified to be modified by N6-methyladenosine (m6A) in many cells. However, the significance of m6A-modified circular RNAs (circRNAs) has not been elucidated in HGSOC peritoneal metastasis. Here, we aimed to investigate the participation and potential functions of m6A-modified circRNAs in HGSCO peritoneal metastasis. Methods: Cancerous tissues were collected from the in situ and the peritoneal metastasis lesions of HGSCO patients. M6A-tagged circRNAs were identified by m6A-modified RNA immunoprecipitation sequencing (m6A-RIP-seq). Gene Ontology (GO) annotation and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses were performed to predict the potential functions of the m6A-modified circRNAs. Results: For the m6A-modified circRNAs, 259 were upregulated and 227 were downregulated in the peritoneal metastasis than in the situ lesions of HGSCO patients. For the m6A peaks, 1541 were upregulated and 1293 were downregulated in the peritoneal metastasis than in the in situ lesions of HGSCO patients. For the differential expressed circRNAs, 1911(19.6%) were upregulated and 2883(29.6%) were downregulated in the peritoneal metastasis than in the in situ lesions of HGSCO patients. The upregulated m6A-modified circRNAs were associated with the HIF-1 signaling. The downregulated m6A-modified circRNAs were associated with the MAPK signaling. Conclusions: This work firstly identified the transcriptome-wide map of m6A-modified circRNAs in peritoneal metastasis of HGSCO. Our findings provided novel evidences about the participation of m6A-modified circRNAs via HIF-1 and MAPK signaling and a new insight in molecular target of HGSCO peritoneal metastasis.

Effects of Acute Alcohol Intake on Nasal Patency.

BACKGROUND: Acute alcohol intake may influence nasal patency; however, there is lack of objective evidence. OBJECTIVE: The aim of this study was to evaluate the effects of acute alcohol intake on nasal patency employing both subjective and objective measures. METHODS: A total of 31 participants were classified into 2 groups of non-heavy drinkers (n = 17) and heavy drinkers (n = 14). Both groups consumed wine in 1 h and were assessed for subjective nasal symptoms and objective nasal patency, using rhinomanometry and acoustic rhinometry, at baseline and at 0.5, 2, and 6 h post-alcohol consumption. RESULTS: Alcohol consumption significantly increased nasal obstruction from baseline values in both heavy and non-heavy drinking groups. Total nasal volume (TNV) and the minimal cross-sectional area (MCA) were significantly decreased and nasal airway resistance (NAR) significantly increased from baseline values by 2 h post-alcohol consumption for both heavy and non-heavy drinking groups (P < .05). Significant differences were found in TNV, MCA, and NAR between baseline and post-drinking in allergic rhinitis subjects; with no significant differences in MCA and NAR in subjects without allergic rhinitis. Pulse rate (PR) and temperature (T) were elevated, and blood pressure (BP) was decreased after alcohol consumption (P < .05). Blood alcohol concentration (BAC) was not significantly correlated with nasal patency with regard to any subjective or objective measurement. CONCLUSION: Acute alcohol consumption may impair nasal patency, independent of the amount consumed. Individuals with allergic rhinitis may be more prone to nasal obstruction after alcohol consumption than those without allergic rhinitis.

Air Pollution Exposure Affects Severity and Cellular Endotype of Chronic Rhinosinusitis With Nasal Polyps.

OBJECTIVES/HYPOTHESIS: Air pollution has emerged as an important environmental risk factor for chronic rhinosinusitis (CRS) progression. This study assessed exposure to five types of air pollution (PM2.5/10 , SO2 , NO2 , CO, O3 ) and explored their effects on CRS with nasal polyps (CRSwNP) severity and endotype. STUDY DESIGN: Retrospective cohort study. METHODS: Air pollution data from monitoring sites in Beijing were obtained to assess individual air pollution exposure. Outcomes of CRSwNP (n = 282) including Lund-Mackay (L-M) score, Lund-Kennedy (L-K) score, visual analogue scale (VAS) score and nasal patency/airflow resistance and so on were measured to analyze correlations with air pollution and compare groups with different exposure types. Multivariable-adjusted binary logistic regression was used to determine potential air pollution risk factors of the endotype of eosinophilic CRSwNP (ECRSwNP). RESULTS: Short-term exposures to PM2.5/10 , SO2 , CO, NO2 , and O3 were weak but significantly associated with increased L-M scores. Short-term exposures to PM10 , CO, and NO2 were correlated with increased VAS headache/facial pain scores. The L-M scores of the group of the highest PM2.5 (≥150 µg/m3 ) exposure were significantly higher than those of control group. For each increased unit of the average concentration of PM2.5 , there was a 1.047-fold (95% confidence interval, 1.005-1.091) increased risk of the endotype of ECRSwNP. CONCLUSIONS: Air pollution exposure exacerbated CRSwNP severity and PM2.5 could be a risk factor for endotype of ECRSwNP, suggesting the role of air pollution in CRSwNP pathogenesis. LEVEL OF EVIDENCE: 4 Laryngoscope, 132:2103-2110, 2022.

Effect of starter cultures mixed with different autochthonous lactic acid bacteria on microbial, metabolome and sensory properties of Chinese northeast sauerkraut.

Effects of mixed cultures composed of any two of four autochthonous lactic acid bacteria on fermentation of Chinese northeast sauerkraut were investigated in this study. Results indicated that different mixed cultures inoculation generated diversified physicochemical, microbiological and flavor quality of sauerkraut. Compared to spontaneous fermentation, mix-culture fermentation showed significant higher population of lactic acid bacteria and lower amounts of undesirable microorganisms. Free amino acids increased by 2- to 5-fold from initial level in spontaneous and mix-culture fermentation, with the lowest production by spontaneous fermentation. Moreover, mix-culture fermentation promoted the flavor formation based on the analysis of HS-SPME/GC-MS, E-nose, E-tongue and sensory evaluation, especially for the mixed culture of Leu. mesenteroides and L. plantarum. These results highlighted that using a mixed culture made up with Leu. mesenteroides and L. plantarum could be a potential way to improve the quality of sauerkraut, which could provide an alternative way to meet consumers' requirement.

[Investigation of Laboratory and Clinical Feature in the Patients with Myeloproliferative Neoplasm Co-expression of BCR-ABL1 and JAK2 V617F].

OBJECTIVE: To analyze the comprehensive laboratory test data of BCR-ABL1 fusion gene and JAK2 V617F mutation co-expressed in myeloproliferative neoplasm (MPN) patients, and investigate its relative clinical significance. METHODS: Data of 1 332 MPN patients were comprehensively analyzed, BCR-ABL1 (P190/P210/P230) fusion gene and JAK2 V617F mutation were detected by real time-polymerase chain reaction (RT-PCR) technique, the CALR, MPL, JAK2 12 and 13 exon mutations were detected by the First Generation Sequencing, the bone marrow cell morphology and pathological characteristics were evaluated by bone marrow smear and biopsy technique, the immune phenotypes of bone marrow cells were evaluated by flow cytometry, the chromosome karyotypes of bone marrow cells were analyzed by chromosome G banding technique. RESULTS: Four of the 1 332 patients were found to have the co-existence of BCR-ABL1 fusion gene and the JAK2 V617F mutation, with a 0.3% incidence and a median age of 70 years old, including 2 cases of polycythemia vera, 1 case of primary myelofibrosis, and 1 case of chronic myeloid leukemia-accelerated phase. The clues of double positive genes of such patients at the time of initial diagnose could not be cued only by age, physical signs and cell morphology, they should be analyzed by comprehensive test data. CONCLUSION: The co-existence of BCR-ABL1 fusion gene and JAK2 V617F mutation in the same case is a kind of disease with special clinical significance. The application of multiple detection methods can improve the detection of this disease, which is conducive to early detection, reasonable diagnosis and treatment by clinicians.

Proteomic analysis validates previous findings on wounding-responsive plant hormone signaling and primary metabolism contributing to the biosynthesis of secondary metabolites based on metabolomic analysis in harvested broccoli (Brassica oleracea L. var. italica).

The plant wound-response is a complex process that generates physiological modifications for protecting the wounded tissue. In this study, tandem mass tag (TMT)-based quantitative proteomic analysis was performed to clarify the comprehensive molecular mechanism for the wound-response of broccoli subjected to two wounding intensities (0.04 and 1.85 m2 kg-1 for florets and shreds, respectively). Furthermore, integrated proteomic and metabolomic analysis was performed to reveal the interaction among the critical metabolic pathway responses to wounding. The results show that a total of 399 proteins and 266 proteins were identified as differentially expressed proteins (DEPs) in florets and shreds broccoli compared to control, respectively. Furthermore, 167 DEPs were detected in shreds broccoli compared to the florets broccoli. Salicylic acid (SA) and ethylene (ET) biosynthesis were more susceptible to being induced by wounding with lower intensities, whereas, phenylpropanoid biosynthesis, aliphatic glucosinolate synthesis and jasmonic acid (JA) biosynthesis were more susceptible to being activated by wounding with higher intensities. The activation of starch and sucrose metabolism, TCA cycle, glycolysis, pentose phosphate could provide carbon sources and ATP for the production of amino acids including phenylalanine, valine, threonine, isoleucine, L-methionine, methionine and histidine. The motivation of carbohydrate metabolic pathways and amino acid biosynthesis-related pathways promotes the precursor levels for phenolic substances and glucosinolate synthesis. Furthermore, the accumulation of SA, ET and JA may activated secondary metabolite biosynthesis through the regulation of critical proteins involved in the corresponding metabolic pathways.

Palladium-Catalyzed C-H Allylation of Electron-Deficient Polyfluoroarenes with gem-Difluorinated Cyclopropanes.

A palladium-catalyzed C-H allylation of electron-deficient polyfluoroarenes with gem-difluorinated cyclopropanes is reported. It provides a useful and facile approach to 2-fluoroallylic polyfluoroarenes in moderate to excellent yields with high Z-selectivity. In addition, this new approach has good functional group compatibility and broad substrate scope.

Metabolomics and physiological analyses validates previous findings on the mechanism of response to wounding stress of different intensities in broccoli.

The mechanism of response of plant to wounding stress is a complex process that physiologically modifies the wounded tissue for protection. In this study, untargeted metabolomics and physiological analyses were performed to validate the molecular mechanism of response to wounding stress of two intensities (0.04 and 1.85 m2 kg-1) in broccoli florets and shreds, respectively. The results showed that 97 and 1220 differentially expressed metabolites could be identified in broccoli subjected to the Florets vs. Control and Shreds vs. Control experiments, respectively. The Kyoto Encyclopedia Genes and Genomes pathway analyses revealed that these metabolites were mainly involved in aminoacyl-tRNA, amino acid, and secondary metabolite biosynthesis; purine metabolism; and plant signal molecule production. This study validated that wounding stress induced plant signal molecule production. Activation of jasmonic acid biosynthesis and H2O2 production were more susceptible to wounding stress of higher intensities, whereas induction of salicylic acid biosynthesis and O2- production were more susceptible to wounding stress of lower intensities. Furthermore, wounding stress also activated glucosinolate and phenylpropanoid biosynthesis by regulating the levels of the precursors, including L-leucine, phenylalanine, tyrosine, valine, isoleucine, tryptophan, methionine, and phenylalanine. Wounding stress induced phenylpropanoid biosynthesis and the antioxidant system by upregulating the corresponding critical enzyme activity and gene expression, contributing greatly to the enhancement of phenolic compound levels, free radical scavenging ability, and resistance to wounding in broccoli.

Effect of Ethanol Vapor Treatment on the Growth of Alternaria alternata and Botrytis cinerea and Defense-Related Enzymes of Fungi-Inoculated Blueberry During Storage.

The aim of the present study was to investigate the effects of ethanol vapor on the inhibition of Alternaria alternata and Botrytis cinerea in postharvest blueberry and the induction of defense-related enzymes (DREs) activities in fungi-inoculated blueberries stored at 0±0.5°C for 16days. Results indicated that ethanol vapor markedly inhibited the mycelial growth of A. alternata and B. cinerea in a dose-dependent manner, with inhibition rates of 9.1% (250µlL-1), 36.4% (500µlL-1), and 5.5% (1,000µlL-1) on A. alternata and 14.2% (250µlL-1), 44.7% (500µlL-1), and 76.6% (1,000µlL-1) on B. cinerea, respectively. Meanwhile, ethanol vapor also enhanced the activities of DREs in fungi-inoculated blueberries, including ß-1,3-glucanase (GLU), chitinase (CHI), phenylalnine ammonialyase (PAL), peroxidase (POD), and polyphenol oxidase (PPO). In particular, 500µlL-1 ethanol vapor increased the activities of DREs by 84.7% (GLU), 88.0% (CHI), 37.9% (PAL), 85.5% (POD), and 247.0% (PPO) in A. alternata-inoculated blueberries and 103.8% (GLU), 271.1% (CHI), 41.1% (PAL), 148.3% (POD), and 74.4% (PPO) in B. cinerea-inoculated blueberries, respectively. But, the activity of PPO was decreased by 55.2 and 31.9% in 500µlL-1 ethanol-treated blueberries inoculated with A. alternata and B. cinerea, respectively, after 8days of storage. Moreover, the surface structure and ultrastructure of 500µlL-1 ethanol-treated blueberry fruit cells were more integrated than those of other treatments. The findings of the present study suggest that ethanol could be used as an activator of defense responses in blueberry against Alternaria and Botrytis rots, by activating DREs, having practical application value in the preservation of postharvest fruit and vegetables.

Comparison of northeast sauerkraut fermentation between single lactic acid bacteria strains and traditional fermentation.

The quality characteristics of sauerkraut fermented with autochthonous LAB selected from traditional northeast sauerkraut were investigated. The physicochemical, microbiological and metabolome were also determined. The pH decreased rapidly in inoculated sauerkraut along with high sugar utilization and acid production. qPCR analysis showed that inoculated products exhibited sufficient numbers of beneficial bacteria. PCA showed clear differences in volatilome profiles of sauerkraut depending on starter cultures used. The greatest abundance of esters (ethyl lactate, ethyl acetate and isoamyl acetate) was detected in L. plantarum-inoculated sauerkraut. Sauerkraut inoculated with L. paracasei had a significantly higher content of lactones. Leu. mesenteroides and W. cibaria inoculation contributed to an increase in acids and ketones. FAAs increased by 4.16-, 5.21-, 5.99-, 7.11- and 5.51-fold from the initial levels in spontaneous-, Leu. mesenteroides-, L. plantarum-, L. paracasei- and W. cibaria-fermented sauerkraut, respectively. Therefore, the physicochemical properties and aromatic quality of sauerkraut strongly depended on the starters used.

The effect of cutting style on the biosynthesis of phenolics and cellular antioxidant capacity in wounded broccoli.

To explore the effect of cutting style on the biosynthesis of phenolic compounds and cellular antioxidant capacity in wounded broccoli subjected to different cutting styles (heads, florets, 1/2 florets and shredded florets), the mechanism of the accumulation of phenolic compounds was investigated at the transcriptional level, and cellular antioxidant capacity was measured using a breast cancer cell MCF-7 culture model. The results indicated that the relative expression of the genes encoding phenylalanine ammonia-lyase, cinnamic acid 4-hydroxylase and 4-coumarin coenzyme A ligase, three enzymes involved in phenylpropanoid metabolism, was upregulated and that contributed to the synthesis of individual phenolic compounds, including catechin, hydroxybenzoic acid, chlorogenic acid, caffeic acid, sinapic acid, catechin gallate, rutin, cinnamic acid and quercetin. This research constructes the phenol synthesis pathway in wounded broccoli. Moreover, the relative expression of critical genes including superoxide dismutase, peroxidase, catalase, glutathione peroxidase and glutathione reductase involved in the metabolism of reactive oxygen species (ROS) increased, resulting in enhanced antioxidant capacity in wounded broccoli. Cell antioxidant capacity (CAA) of heads, florets, 1/2 florets and shredded florets increased by 52.7%, 59.2%, 64.8% and 86.5%, respectively, compared to whole broccoli. The enhancement of CAA was greater as the intensity of wounding increased, indicating that enhancement of antioxidant activity occurred at the cellular level. This research helps provide a reliable and persuasive theoretical basis for nutritional value assessment at the cellular level in wounded broccoli.

Microbial Community Dynamics and Metabolome Changes During Spontaneous Fermentation of Northeast Sauerkraut From Different Households.

Sauerkraut, one of the most popular traditional fermented vegetable foods in northern China, has been widely consumed for thousands of years. In this study, the physicochemical characteristics, microbial composition and succession, and metabolome profile were elucidated during the fermentation of traditional northeast sauerkraut sampled from different households. The microbial community structure as determined by high-throughput sequencing (HTS) technology demonstrated that Firmicutes and Proteobacteria were the predominant phyla and Weissella was the most abundant genus in all samples. Except for Weissella, higher relative abundance of Clostridium was observed in #1 sauerkraut, Clostridium and Enterobacter in #2 sauerkraut, and Lactobacillus in #3 sauerkraut, respectively. Meanwhile, Principal component analysis (PCA) revealed significant variances in the volatilome profile among different homemade sauerkraut. Acids and lactones were dominant in the #1 sauerkraut. The #2 sauerkraut had significantly higher contents of alcohols, aldehydes, esters, sulfides, and free amino acids (FAAs). In comparison, higher contents of terpenes and nitriles were found in the #3 sauerkraut. Furthermore, the potential correlations between the microbiota and volatilome profile were explored based on Spearman's correlation analysis. Positive correlations were found between Clostridium, Enterobacter, Lactobacillus, Leuconostoc, Weissella and most volatile compounds. Pseudomonas, Chloroplast, Rhizobium, Aureimonas, and Sphingomonas were negatively correlated with volatile compounds in sauerkraut. This study provided a comprehensive picture of the dynamics of microbiota and metabolites profile during the fermentation of different homemade northeast sauerkraut. The elucidation of correlation between microbiota and volatile compounds is helpful for guiding future improvement of the fermentation process and manufacturing high-quality sauerkraut.

Effect of atmospheric cold plasma treatment on antioxidant activities and reactive oxygen species production in postharvest blueberries during storage.

BACKGROUND: Blueberry is universally acknowledged as a kind of berry rich in antioxidants. Cold plasma, an emerging non-thermal treatment technology, has been proved to be able to maintain or improve the antioxidant level while inactivating the microorganisms on the surface of fruits and vegetables. Postharvest blueberries were treated with atmospheric cold plasma (ACP; 12 kV, 5 kHz) for 0 s (Control), 30 s (ACP-30), 60 s (ACP-60), and 90 s (ACP-90) in this study, and the effects of ACP on the antimicrobial properties, antioxidant activities, and reactive oxygen species (ROS) production were investigated during storage at 4 ± 1 °C for 40 days. RESULTS: Total aerobic bacteria and mold populations on ACP-treated blueberries decreased significantly in a time-dependent manner (P < 0.05), and decreased by 0.34-1.24 and 0.57-0.87 log10 CFU g-1 respectively on ACP-60-treated blueberries during storage. The decay rate of blueberries was decreased by 5.8-11.7% and the decrease of blueberry firmness was slowed down by ACP-60. But the total phenol, anthocyanin, and ascorbic acid contents increased, and superoxide dismutase, catalase, and peroxidase activities were enhanced in ACP-treated blueberries. The free radical scavenging activity and total antioxidant capacity (T-AOC) were enhanced. Hydrogen peroxide (H2 O2 ) and superoxide anion (O2 - ) production rates declined by 27.3% and 41.3% at day 40 of storage, respectively. CONCLUSION: It is suggested that ACP may be a promising non-thermal treatment technology for postharvest sterilization and preservation of blueberry under suitable conditions. © 2020 Society of Chemical Industry.

Microbial dynamics and volatilome profiles during the fermentation of Chinese northeast sauerkraut by Leuconostoc mesenteroides ORC 2 and Lactobacillus plantarum HBUAS 51041 under different salt concentrations.

This study aimed to investigate the effects of salt concentration on the microbial community and flavor metabolites formed during northeast sauerkraut fermentation using a starter culture consisting of a combination Leuconostoc mesenteroides ORC 2 and Lactobacillus plantarum HBUAS 51041. The results revealed a correlation between microbiota and flavor metabolites, with the top 20 genera being identified using Illumina MiSeq. Lactobacillus and Leuconostoc were dominant genera throughout the fermentation process, and PCoA showed that the salt concentration had distinct impacts on the microbial community. The most abundant genus Lactobacillus (88.46%) was observed in the 0.5% salted sauerkraut at day 30. Forty-six flavor metabolites were identified by HS-SPME/GC-MS. The relative contents of esters, aldehydes and ketones showed the highest values in sauerkraut fermented with a 0.5% salt concentration. Sauerkraut fermented at 2.5 and 3.5% salt were characterized by higher relative contents of acids, alcohols, isothiocyanates and hydrocarbons. Spearman's rank correlation test results showed that Lactobacillus, Leuconostoc, Enterobacteriaceae, Pseudomonas, Staphylococcus and Bacillus were closely related to flavor metabolites. These results showed the effects of salt concentration on fermentation of northeast sauerkraut, revealing that sauerkraut fermented with 0.5% salt possessed a higher abundance of Lactobacillus and accumulated more flavor compounds (esters, aldehydes, ketones, nitriles and sulfides), providing a potential alternative approach to meet the preference of consumers for desirable aromatic quality. The results of this study may contribute to the industrial production of sauerkraut in Northeastern China.