ABSTRACT
In vitro experiments have indicated prebiotic activity of isomaltulose, which stimulates the growth of probiotics and the production of short chain fatty acids (SCFAs). However, the absence of in vivo trials undermines these results. This study aims to investigate the effect of isomaltulose on composition and functionality of gut microbiota in rats. Twelve Sprague-Dawley rats were divided into two groups: the IsoMTL group was given free access to water containing 10% isomaltulose (w/w), and the control group was treated with normal water for five weeks. Moreover, 16S rRNA sequencing showed that ingestion of isomaltulose increased the abundances of beneficial microbiota, such as Faecalibacterium and Phascolarctobacterium, and decreased levels of pathogens, including Shuttleworthia. Bacterial functional prediction showed that isomaltulose affected gut microbial functionalities, including secondary bile acid biosynthesis. Targeted metabolomics demonstrated that isomaltulose supplementation enhanced cholic acid concentration, and reduced levels of lithocholic acid, deoxycholic acid, dehydrocholic acid, and hyodeoxycholic acid. Moreover, the concentrations of propionate and butyrate were elevated in the rats administered with isomaltulose. This work suggests that isomaltulose modulates gut microbiota and the production of SCFAs and secondary bile acids in rats, which provides a scientific basis on the use of isomaltulose as a prebiotic.
Subject(s)
Bile Acids and Salts/metabolism , Fatty Acids, Volatile/metabolism , Gastrointestinal Microbiome/drug effects , Isomaltose/analogs & derivatives , Probiotics/pharmacology , Animals , Glucose Tolerance Test , Isomaltose/pharmacology , Male , RNA, Ribosomal, 16S/metabolism , Rats , Rats, Sprague-DawleyABSTRACT
BACKGROUND: Caramel is used as food colorant in many parts of the world. However, there have been no studies investigating the effects of spray drying on sucrose and glycine solutions. In this study, model sucrose and glycine solutions at different pH levels (pH 4, 3, 2 and 1) were treated with different inlet air temperatures (160, 180, 200, 220 and 240 °C) for durations of 50 s in the spray drying process. RESULTS: With increasing inlet temperatures and decreasing pH, the morphology of the caramel agglomerates tended to be more scattered; however, the solubility of the caramel decreased. With increasing inlet temperature, the glycine and sucrose contents decreased but the fructose and glucose contents increased. CONCLUSION: The content of the intermediate products, browning intensity and amount of 5-hydroxymethyl-2-furaldehyde (HMF) increased with increasing inlet temperature and decreasing pH. Therefore, the amount of sucrose degradation and the change in pH can be used to evaluate caramel properties in the spray drying process. © 2015 Society of Chemical Industry.
Subject(s)
Carbohydrates/chemistry , Food Handling/methods , Glycine/chemistry , Sucrose/chemistry , Aerosols/chemistry , Furaldehyde/analogs & derivatives , Furaldehyde/chemistry , Maillard Reaction , Powders/chemistryABSTRACT
OBJECTIVE: To analyse the cause, diagnosis, treatment and preventive methods of uterine perforation resulting from hysteroscopic electro-surgeries. METHODS: Data of cases with uterine perforation were collected from 5 hospitals where overall 3,541 hysteroscopic electro-surgeries were done from May 1990 to July 2002. There were 1 468 transcervical resections of endometrium (TCRE), 797 cases of transcervical resection of myoma (TCRM), 783 cases of transcervical resection of endometrial polyp (TCRP), 189 cases of transcervical resection of uterine septa (TCRS), 112 cases of transcervical resection of uterine adhesion (TCRA) and 192 cases of transcervical removal of foreign body (TCRF). All operations were performed under B-ultrasonographic or laparoscopic monitoring. Cervical dilator stick was inserted into cervical canal or 200 micro g of misoprostol put in the posterior fornix the evening before operation. The procedures were done according to different indications and purposes. Cases of uterine perforation were divided into two groups: caused by approaching (entry-related) and by surgical instruments (technique-related). RESULTS: Totally sixteen cases (0.45%) of uterine perforation occurred. Seven cases occurred during cervical dilatation and 1 during hysteroscopy inserting lentry-related. Eight cases were technique-related caused by electrode. The incidences of uterine perforation of different operations were: TCRA 4.46% (5/112), TCRF 3.12% (6/192), TCRE 0.27% (4/1 468), TCRM 0.13% (1/797). TCRP and TCRS none. These 16 cases were all diagnosed during operations. 10 cases (62%) by B ultrasound and (or) laparoscopy, 6 cases (38%) by hysteroscopy and clinical features. 13 cases were complete uterine perforations, among them 2 were diagnosed by laparoscopic monitoring, 5 by B-ultrasonic monitoring, 4 by hysteroscopy and 2 by symptoms and B-ultrasound, 3 cases were incomplete uterine perforations in which 2 were diagnosed by laparoscopic monitoring and one by B-ultrasound monitoring. CONCLUSIONS: Half of uterine perforation cases were entry-related, so attention has to be paid to entry of Hegar or hysteroscopy (i.e., not dilate the cervix as possible and introduce the scope under direct vision). The other half were related to surgeons' experience and type of operation. TCRA and TCRF run more risks. B-ultrasound and (or) laparoscopy monitoring during hysteroscopic electro-surgery may help to prevent but not completely avoid uterine perforation.
