School the Medicine, Dentistry and also Nursing, college of medical Veterinary and also Life Sciences, college of Glasgow, Glasgow G31 2ER, UK
Received: 17 October 2016 / Revised: 16 December 2016 / Accepted: 22 December 2016 / Published: 1 January 2017
n = 15, β(1-1) n = 9 every others n = 10. A indicates significant differences come α(1-1), b indicates far-reaching differences native β(1-4) p † suggests p = 0.086 vs. α(1-1) * suggests p = 0.057 vs. β(1-4), + shows p = 0.051 vs. β(1-4), ‡ shows p = 0.078 vs. α(1-1).

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SCFA manufacturing after 24 h the fermentation mmol/g carbohydrate/day. Typical (SEM), α(1-1), β(1-4) n = 15, β(1-1) n = 9 every others n = 10. * significant differences in between bond anomers.

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Individually plotted pure SCFA production. Di-glucose α(1-1): (A) Acetate; (B) Propionate; (C) Butyrate; (D) full SCFA.; Di-glucose β(1-4); (E) Acetate; (F) Propionate; (G) Butyrate; (H) complete SCFA.

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Abstract


Short chain fat acids (SCFA) are the significant products that carbohydrate fermentation by gut bacteria. Different carbohydrates are connected with characteristics SCFA file although the mechanisms room unclear. The individual SCFA profile may determine any kind of resultant health and wellness benefits. Understanding determinants of separation, personal, instance SCFA manufacturing would allow substrate selection to be tailored for colonic SCFA manipulation. To test the hypothesis that the orientation and position that the glycosidic shortcut is a determinant the SCFA manufacturing profile, a miniaturized in vitro human being colonic batch fermentation model was used to examine a selection of isomeric glucose disaccharides. Diglucose α(1-1) fermentation caused significantly greater butyrate production (p ns p ns colonic fermentation; gut microbiota; non-digestible carbohydrates; brief chain fatty acids; glycosidic bond colonic fermentation; gut microbiota; non-digestible carbohydrates; brief chain fatty acids; glycosidic bond
There is increasing proof that bioactive molecules produced during colonic bacterial fermentation beat a main role in the advantageous effects of non-digestible carbohydrates (NDC) <1>. Diet NDC room the significant fermentable ingredient of diet fiber and also have been linked with positive wellness outcomes regarded appetite regulation, human body composition and metabolic health and wellness <2,3>. Short chain fatty acids (SCFA) room the main assets of saccharolytic bacterial fermentation the NDC, v acetate, propionate, and butyrate gift the major SCFA created <4>. Although there is significant variability between individuals, SCFA are produced in the approximate proportion 60:20:20 for acetate, propionate and butyrate dong <5>. With enhanced interest in the results of SCFA on human being metabolic health <2>, over there is a farming need come understand how NDCs and also the gut microbiota connect to yield different patterns the SCFA production and also if certain profiles are concerned improved health and wellness outcomes.
Acetate is a main metabolite in intermediary metabolism and is affiliated in lipid and cholesterol synthesis <6,7> and main appetite regulation <8>. In enhancement to inhibiting de novo cholesterol and also lipid synthetic <9,10>, propionate is a precursor because that intestinal <3> and also hepatic gluconeogenesis <7>. Selectively boosting colonic propionate in humans, through the consumption of inulin propionate ester, has actually been displayed to manage appetite, reduce hepatic and also intra-abdominal visceral fat depots and also reduce human body weight get in overweight adults <2>. Butyrate is the desired energy resource for the colonic epithelial cells <11>, has regulatory roles in cellular proliferation and apoptosis <12> and has newly been presented to play a role in immune regulation <13,14>. At the molecular level, several of the observed results of SCFA on cellular role are believed to be mediated through a receptor mediated cascade involving complimentary fatty acid receptor 2 (FFAR2) and totally free fatty acid receptor 3 (FFAR3) <15>. These receptors are existing on a selection of cell types including endocrine cells, adipocytes and immune cells <16>. FFAR 2/3 express on enteroendocrine L-cells have actually been presented to be connected in the receptor mediated release of the anorexigenic gut hormones peptide YY (PYY) and also glucagon-like peptide 1 (GLP-1) <17>. ~ above immune cells FFAR2 appears to play an important role in the common resolution of inflammatory responses in pet models the colitis, arthritis and asthma <18>.
The myriad of metabolically important and immune-related cell varieties expressing FFAR 2/3 has actually led to a renewed attention in the duty of SCFA as essential signaling molecules linking diet, the gut microbiome and health <19>. However, at present, that is not straightforward to selectively manipulate production of individual SCFA in the diet the humans because the factors which journey the production of one SCFA over an additional are no well understood.
The file of SCFA manufacturing is thought to be regarded the physicochemical nature of NDCs reaching the colon, which subsequently may identify which members of the gut microbiota consortium room able come derive power from NDC fermentation, yielding SCFA together the diminished end-products <20>. Factors which have actually been shown to affect SCFA production profile include monosaccharide composition and also distribution, glycosidic link linkage and also NDC chain length and also branching <21,22,23>. Soluble NDC appear an ext readily fermented 보다 insoluble NDC, and also previous research studies have said that solubility (or chain length) may affect the profile of SCFA created <24>. Pyrodextrinised starch, a short molecular load carbohydrate with new β-glycosidic bonds created after warm treatment the the native starch, has been presented to increase propionate manufacturing in vitro <24>. Furthermore, in vitro investigate have additionally demonstrated a direct association in between the lot of soluble fiber and also SCFA production <25>. However, the relationship between NDC solubility and SCFA manufacturing is no truly representative the the human being diet and its combined NDC composition, exemplified by the truth that insoluble, high molecular weight resistant strength is plentiful in the human diet and highly fermentable by the human being gut microbiota <26>.
Fermentation of part mono- and di-saccharides appears to donate selective SCFA production. In vitro, sorbitol fermentation selectively raised butyrate production whereas glucose, xylose, and also fructose fermentation selectively boosted acetate production <21,23>. Rhamnose has actually been shown, in both in vitro fermentations and also in vivo feeding studies, to selectively rise propionate production <27,28>. Lactose fermentation selectively enhanced acetate production <23,29>. In an experiment with a solitary fecal donor, it was observed the diglucose β(1-2) (sophorose), and mannobiose with various glycosidic bond linkages (dimannose 2α, 3α, 4α, 6α) raised propionate production. Diglucose α(1-1) α(α, α-trehalose) and also diglucose β(1-1) β(β, β-trehalose) and 3α-digalactose (3α-galactobiose) enhanced butyrate production <29>.
Predicting SCFA yield from individual NDC is no straightforward. Acetate is almost exclusively the many abundant SCFA produced. Propionate production is linked with higher abundance the β-glycosidic bond in NDCs together demonstrated by fermentation of laminarin <30> and also pyrodextrinised starch <24>. In contrast, starch consisting of α-glycosidic bonds, and also oligofructose consists of both α and β-glycosidic bonds outcomes in a selective rise in butyrate production <24,25>. SCFA manufacturing is likewise influenced by the composition of these complex NDC wherein the fermentability of every of the constituent street may determine the distinctions in SCFA developed <22>. Colonic bacteria differ in their ability to make use of substrates, yielding often certain SCFAs through the saccharolytic fermentation pathways encoded in your genomes <31>. For example, the genus Roseburia makes use of starch to produce butyrate <32> and also in contrast both, Ruminococcus obeum related varieties and Roseburia inulinivorans are connected in the manufacturing of propionate <33>. The relationship between monosaccharide composition, intra-molecular glycosidic bond configuration and also chain length shows up to it is in complex. However, make the efforts to design the fermentation procedure in silico have presented some promise. Making use of a differential equation model, many of the changes in the microbiota and an essential metabolites, such as SCFA, have actually been simulated in continuous flow fermenters inoculated with human fecal microbiota <34>.
In the existing study, the relationship between glycosidic bond orientation and also position and SCFA production was investigated making use of glucose-glucose disaccharides as version NDC substrates. This allowed for experimental manage of confounding components such together solubility and monosaccharide compositions ~ above SCFA production.
Glucose-glucose disaccharides (diglucoses) were used as model substrates to check out all bond alternatives on SCFA manufacturing with the exemption of diglucose β(1-1) β (β, β-trahalose) i beg your pardon was not commercially feasible. Disaccharide substrates were derived from Carbosynth (Berkshire, UK). Shortcut linkages investigated were; diglucose α(1-1) (α, α-d-trehalose dihydrate), diglucose β(1-1) (α, β-trehalose), diglucose α(1-2) (kojibiose), diglucose β(1-2) (sophorose), diglucose α(1-3) (nigerose), diglucose β(1-3) (laminaribiose), diglucose α(1-4) (d-maltose monohydrate), diglucose β(1-4) (d-cellobiose), diglucose α(1-6) (isomaltose), diglucose β(1-6) (d-gentiobiose). A empty (no-substrate) control was also used to readjust for elevator SCFA production. Due to the price of some substrates, miniaturized batch fermentations the those supplied previously were established <35,36>. In the present study, the technique was proportionally scaled under by a aspect of 20 (to 2.5 mL) and validated against our standard bigger (50 mL) fermentation system.
Fermentation vials contained: 50 mg of each substrate, 0.1 mL the reducing systems (per 50 mL 312.5 mg cysteine hydrochloride, 2 mL 1 M NaOH, 312.5 mg Na2S·9H2O, dH2O to 50 mL) and 2.1 mL of pre-boiled, and cooled under oxygen totally free nitrogen (OFN) fermentation medium (per liter 2.25 g tryptone, 450 mL dH2O, 112.5 μL micromineral equipment (13.2 g CaCl2·2H2O, 10 g MnCl2·4H2O, 1 g CoCl2·6H2O, 8 g FeCl3·6H2O come 100 mL making use of dH2O), 225 mL bicarbonate solution (2 g NH4HCO3, 17.5 g NaHCO3 come 500 mL through dH2O), 225 mL macromineral solution (providing buffering) (2.85 g Na2HPO4, 3.1 g KH2PO4, 0.3 g MgSO4·7H2O come 500 mL with dH2O) and also 1.125 mL 0.1% resazurin (an indicator of anaerosis), and adjusted for a beginning fermentation pH the 7 to be sealed v airtight seals and degassed under oxygen totally free nitrogen (OFN) for one minute. Every vessel, 250 μL the 32% fecal slurry prepared by adding pre-boiled and also OFN cooled sodium phosphate Sorensen’s buffer to a homogenized stool and also blended (with a standard family blender) and strained with nylon (to remove huge food residues) before being injected right into the vial. The vials underwent a additional degassing through OFN because that 1 min prior to being incubated in a shower water bathtub at 37 °C. ~ 0, 8 and 24 h that incubation, 400 μL that fermentation fluid were taken because that pH measurement (Mettler Toledo pH meter), and 150 μL of 1 M NaOH added to stabilize the SCFA before extraction.
Stool samples were acquired from 15 healthy Caucasian individuals (8 females, 7 males, median age, 28; 20–52 years), who had not bring away antibiotics in the ahead 6 months and had no cradle disease. Honest permission was granted by the college of Medical, Veterinary and also Life Sciences values Committee, college of Glasgow (Application No.: 2011023) through the sample providers giving informed signed consent. Stool samples to be prepared and incubated in ~ 2 h of gift voided.
For SCFA extraction, 200 μL the the fermentation liquid were extracted. Orthophosphoric acid (50 μL) and 50 μL inner standard (2-ethyl butyric mountain in 2 M NaOH; 73.78 mM) were added and mixed by vortexing. To this mixture, 1 mL that diethyl-ether was included and vortexed for 1 min. The ether phase to be removed, and the ether extraction repeated twice an ext with the 3 extracts an unified and stored in gas-tight vials at −20 °C until analysis by gas chromatography with flame ionization detection (GC-FID). SCFA concentrations to be calculated making use of the ratio of every SCFA to the inner standard (73.8 mM, 2-ethylbutyric acid), calibrated because that individual SCFA an answer in the detector using an exterior standard acetic mountain (183.51 mM), propionic acid (132.52 mM), butyric acid (107.06 mM), valeric mountain (88.63 mM), caproic mountain (74.36 mM), enanthic acid (66.25 mM), caprylic acid (57.84 mM), isobutyric mountain (104.13 mM), isovaleric mountain (86.59 mM) and isocaproic acid (50.93 mM), every in 2 M NaOH.
Statistical evaluation was performed using SPSS version 22 (IBM, Chicago, IL, USA). The Shapiro Wilk check was offered to test for normality of the data. One-way ANOVA with short article hoc Bonferroni evaluation were brought out top top log transformed data on every occasions. Statistical meaning was determined at ns 35> and between basic sugars <21>.
For all substrates tested the early stage pH of the fermentation system did no differ substantially (Table 1). In ~ both 8 and 24 h that fermentation, the pH for diglucose α(1-1) was significantly greater than all other substrates in the α orientation (p ns p 3.2. Impacts of Glycosidic Bond position on SCFA Production
There to be no distinction in full SCFA production as a result of various glycosidic shortcut position, however varying glycosidic bond position led to significant differences in acetate and also butyrate production (Table 2). When considering glycosidic bonds in the α orientation, diglucose α(1-1) created significantly much more (mean (SEM)) butyrate contrasted with diglucose α(1-3) (0.9 (0.2) vs. 0.2 (0.1) mmol/g carbohydrate/day, p = 0.024), diglucose α(1-4) (0.9 (0.2) vs. 0.1 (0.0) mmol/g carbohydrate/day, p = 0.001) and diglucose α(1-6) (0.9 (0.2) vs. 0.2 (0.0) mmol/g carbohydrate/day, ns = 0.006) and significantly much less acetate compared with diglucose α(1-4) (1.8 (0.3) vs. 2.9 (0.3) mmol/g carbohydrate/day, p = 0.009) and diglucose α(1-6) (1.8 (0.3) vs. 2.9 (0.2) mmol/g carbohydrate/day, p = 0.011) respectively. Proportionally, diglucose α(1-1) likewise led to considerably increased butyrate production (p p number 1).
When considering glycosidic bond in the β orientation, diglucose β(1-6) caused significantly greater acetate production contrasted with diglucose β(1-4) (3.7 (0.3) vs. 1.9 (0.2) mmol/g carbohydrate/day, ns = 0.001) (Table 2). Proportionally, diglucose β(1-4) result in substantially reduced acetate production compared with diglucose β(1-1) (67.2 (5.2)% vs. 88.0 (3.3)%; p = 0.016) and also diglucose β(1-6) (67.2 (5.2)% vs. 86.0 (2.0)%, p = 0.023). There to be a tendency for a higher proportion that butyrate production from diglucose β(1-4) contrasted with diglucose β(1-1) (20.4 (3.8)% vs. 6.7 (27)%, ns = 0.051) (Figure 1).
The effect of anomeric orientation on SCFA manufacturing is portrayed in number 2 and also Table 2. There were no distinctions in full SCFA production however diglucoses v α(1-1) bonding raised butyrate production compared with diglucose β(1-1) (0.9 (0.2) vs. 0.2 (0.1) mmol/g carbohydrate/day, ns = 0.01) whereas diglucose α(1-4) developed less butyrate than diglucose β(1-4) (0.1 (0.0) vs. 0.6 (0.1) mmol/g carbohydrate/day, ns = 0.038). Proportionally, diglucose β(1-4) additionally resulted in a significant increased propionate (12.4 (2.8)% vs. 4.9 (1.2)% , p = 0.037) and butyrate (20.4 (3.8)% vs. 3.7 (1.1)% , ns = 0.001), and decreased acetate (67.2 (5.2)% vs. 91.3 (1.9)% , p = 0.001) production compared with diglucose α(1-4). Diglucose α(1-1) led to significantly an ext butyrate (29.3 (4.9) vs. 6.7 (2.7)%, ns = 0.001) and also significantly less acetate manufacturing (58.3 (5.2) vs. 88.0 (3.3)%, p number 1).
Significant variability in SCFA manufacturing was observed between the individual donor samples. A tiny subset that donors (n = 3) showed up to have actually much higher propionate production contrasted with various other donors (Figure 3). Butyrate manufacturing was also variable in between individuals with a small subset the donors (n = 4) appearing to have much greater butyrate production. There to be no consistent pattern across the substrates and participants because that high SCFA yield.
Determining which main factor(s) drive production of separation, personal, instance SCFA could permit selective manipulation that SCFA manufacturing in the colon. Such targeted activation through dietary means would permit selective affect on metabolism and health. For example, Chambers et al. Demonstrated the selective rises in propionate manufacturing led to improvements in appetite regulation, hepatic and also intra-abdominal visceral fat accretion and body weight obtain in overweight adult <2>. Although minimal amounts of diet glucose disaccharides are most likely to reach the colon as result of digestion and/or absorb in vivo, lock represent valuable model compounds because that in vitro studies since they control for other potential confounding components which deserve to influence SCFA manufacturing such as monomer composition and solubility. In the present study, glycosidic bond place had little impact top top SCFA production other than for diglucose (1-1) i beg your pardon had marked effects top top acetate and also butyrate manufacturing with α(1-1) creating increased butyrate compared to the various other α anomers (p ns p 37,38>.
As a an outcome of the high price of the glucose disaccharides used, fermentation experiments to be miniaturized and also the number of fermentations feasible was restricted. Miniaturization is likely have led to raised variability because of propagation of errors when handling smaller samples. This may have actually increased the variability of the data yet the study was powered to watch a difference of 9.5 mM (equivalent come 0.47 mmol/g carbohydrate/day) in propionate production from NDC in vitro which additionally demonstrated an effect on power intake in humans <39>. The yield of SCFA was reduced than supposed from stoichiometric equations i beg your pardon may indicate incomplete fermentation the the substrates with the experimental timeframe. This can be sustained indirectly by the it was observed rapid production of SCFA and also drop in pH i beg your pardon would become increasingly inhibitory to recurring fermentation. A subpopulation of individuals did appear to have higher capacity because that propionate and also butyrate production contrasted with other sample donors. Ahead studies have indicated that SCFA manufacturing varies v pH, with reduced pH favoring butyrate production and greater pH favoring propionate <32>. In our study, pH was measured however no variations to be observed in between participants the would define the higher propionate and also butyrate manufacturing seen in this tiny subset that participants. The reasons for this are unclear yet variations in bacterial groups involved in propionate and also butyrate production have been observed previously <33>. Recent job-related has also demonstrated the the microbiota responds quickly to dietary changes <40> and also the changes in task observed in ~ the subgroups in this study may reflect sport in dietary intake (which was not controlled) in the days prior to sample collection.
The physicochemical properties of NDC space thought to play a duty in determining SCFA production due to the fact that some NDC show up to selectively increase production of separation, personal, instance SCFA. An altering the physicochemical properties of an NDC have the right to also affect SCFA production. Because that example, enhanced solubility as a an outcome of pyrodextrinization of starch, which introduce β bonding right into the mainly α bonded starch, led to enhanced production that propionate in vitro <24>. Various other β-glucans have likewise been associated with enhanced propionate production including, laminarin (mainly β(1-3) and also β(1-6) bonding) and psyllium (mainly β(1-4) bonding) <30>. Resistant strength consisting that α(1-4) and also α(1-6) bonding and oligofructose through β(1-2) and also α(1-2) bonding are connected with boosted butyrate production <36,41,42>. Stewart et al. <43> elegantly demonstrated in the fermentation of inulin form fructans (ITF) that both rate and also proportions of SCFAs developed are influenced by chain length. Boosted molar ratios that acetate and a decrease in molar ratios of butyrate to be observed as ITF chain size increased. No result was observed for molar proportion of propionate with ITF chain length. Hence whether the selected disaccharides serve as a model for fermentation that larger and also more complex oligo and also polysaccharides, whereby both endo- and exo- glycoside hyrolases might play complementary duties in saccharolytic degradation of polymers <44>, is no clear. However, the version substrates studied, uniquely enabled the impact of link position and also configuration to it is in studied totally free of the confounding effects such as added bonding construction invariably existing in countless oligo- and polysaccharides, solubility and also chain length—all potential contributors to changes in the rate and also molar proportion of SCFA production.
From the data in the existing study, it was clear the the position and also configuration the glycosidic bonding in diglucose had actually no major impact ~ above SCFA production profiles. There was part modest influence on SCFA together a an outcome of anomeric orientation for (1-1) and (1-4) diglucose linkages, through both having ~80% difference in butyrate production in between anomers. This data are supported, in part, by previous small-scale studies. Sanz et al. Demonstrated, in a solitary fecal donor making use of all glucose disaccharides, no fads were associated with diglucose linkages, anomeric formation and also the result bacterial population. Although the fermentation of (1-1) did no lead to differences in bacter populations compared to the control, (1-4) fermentation brought about a significant increase in bifidobacteria contrasted with the manage <29>. Castle did yet observe some alters in SCFA production. For example, diglucose isomers include β bonds (including β(1-1)β trehalose which we were can not to include within ours investigation) considerably increased propionate and butyrate production compared to the α bonded diglucose isomers. But diglucose β(1-6) bonding did no follow this pattern <29>. Diglucoses α(1-1) additionally resulted in considerably reduced propionate production, however significantly enhanced butyrate production contrasted to other α bonded diglucoses. The reasons for this selective boost in butyrate manufacturing with α(1-1) glycosidic link configuration are not clear and warrant more investigation. In another study, diglucose α(1-4) and also diglucose α(1-6) linkages caused non-significant rises in propionate and butyrate production <21>. However, comparisons in between these studies and the present study are complicated to interpret since of their quick fermentation duration and the low number of subjects.
In conclusion, our data display that the orientation of glycosidic linkage, in between glucose monomers in ~ least, is no the primary factor determining the SCFA production profile. This argues that the motorists of SCFA production may be associated to various other facets of carbohydrate framework or microbiology. Further investigations into just how other elements of carbohydrate structure affect upon SCFA manufacturing by the microbiota room required.

Acknowledgments


This study was funded by a BBSRC DRINC Doctoral Training grant (BB/H532075/1).

Author Contributions


H.C.H., C.A.E. And also D.J.M. Draft the experiments, and wrote the manuscript, H.C.H. Perform the experiments and also analysis. Every authors added to creating the manuscript.

Conflicts the Interest


The authors explain no problem of interest.

Abbreviations


The following abbreviations are used in this manuscript:
FFAR2/3Free fatty acid receptor 2/3
GC-FIDGas color layer analyzer flame ionization detector
GLP-1glucagon-like peptide-1
NDCnon-digestible carbohydrate
OFNoxygen free nitrogen
PYYpeptide YY

*

Figure 1.Molar proportions of brief chain fat acids (SCFA) manufacturing after 24 h that fermentation. Typical (SEM), α(1-1), β(1-4) n = 15, β(1-1) n = 9 every others n = 10. A indicates far-ranging differences to α(1-1), b indicates significant differences indigenous β(1-4) ns † indicates p = 0.086 vs. α(1-1) * shows p = 0.057 vs. β(1-4), + suggests p = 0.051 vs. β(1-4), ‡ indicates p = 0.078 vs. α(1-1).
Figure 1.Molar proportions of quick chain fat acids (SCFA) production after 24 h the fermentation. Median (SEM), α(1-1), β(1-4) n = 15, β(1-1) n = 9 every others n = 10. A indicates significant differences to α(1-1), b indicates far-ranging differences indigenous β(1-4) ns † suggests p = 0.086 vs. α(1-1) * suggests p = 0.057 vs. β(1-4), + suggests p = 0.051 vs. β(1-4), ‡ shows p = 0.078 vs. α(1-1).
*

*

Figure 2.SCFA manufacturing after 24 h that fermentation mmol/g carbohydrate/day. Typical (SEM), α(1-1), β(1-4) n = 15, β(1-1) n = 9 every others n = 10. * far-ranging differences between bond anomers.
Figure 2.SCFA production after 24 h the fermentation mmol/g carbohydrate/day. Average (SEM), α(1-1), β(1-4) n = 15, β(1-1) n = 9 every others n = 10. * far-reaching differences between bond anomers.
*

*

Figure 3.Individually plotted pure SCFA production. Di-glucose α(1-1): (A) Acetate; (B) Propionate; (C) Butyrate; (D) full SCFA.; Di-glucose β(1-4); (E) Acetate; (F) Propionate; (G) Butyrate; (H) complete SCFA.
Figure 3.Individually plotted absolute SCFA production. Di-glucose α(1-1): (A) Acetate; (B) Propionate; (C) Butyrate; (D) full SCFA.; Di-glucose β(1-4); (E) Acetate; (F) Propionate; (G) Butyrate; (H) total SCFA.
0 h8 h24 hαβαβαβDiglucose (1-1)7.13 (0.14)7.08 (0.24)5.10 (0.17) a,*4.32 (0.25)5.51 (0.06) a,*3.91 (0.12)Diglucose (1-2)7.04 (0.21)7.23 (0.18)4.43 (0.27) b4.29 (0.10)3.93 (0.10) b3.85 (0.08)Diglucose (1-3)7.04 (0.20)6.98 (0.22)4.18 (0.18) b4.50 (0.11)3.92 (0.10) b4.05 (0.12) bDiglucose (1-4)7.06 (0.21)7.16 (0.17)3.93 (0.09) b,*4.49 (0.09)3.64 (0.06) b,*4.15 (0.14) bDiglucose (1-6)7.08 (0.21)7.19 (0.08)4.11 (0.25) b4.24 (0.23)3.81 (0.06) b3.77 (0.11) a
Mean (SEM), different letters in ~ a obelisk indicate far-reaching differences p p n = 15, β(1-1) n = 9 every others n = 10.
AcetatePropionateButyrateTotalGlucose bond OrientationαβαβαβαβDiglucose (1-1)1.8 (0.3) a2.4 (0.3)0.4 (0.1)0.1 (0.0)0.9 (0.2) a,*0.2 (0.1)3.0 (0.4)2.7 (0.3)Diglucose (1-2)2.4 (0.3)2.7 (0.3)0.1 (0.1)0.2 (0.1)0.1 (0.1) 0.5 (0.1)2.9 (0.3)3.5 (0.5)Diglucose (1-3)2.6 (0.3)2.3 (0.3)0.2 (0.1)0.2 (0.1)0.2 (0.1) b0.3 (0.1)3.0 (0.3)2.9 (0.4)Diglucose (1-4)2.9 (0.3) b1.9 (0.2) a0.2 (0.1)0.4 (0.1)0.1 (0.0) b,*0.6 (0.1)3.2 (0.4)2.9 (0.3)Diglucose (1-6)2.9 (0.2) b3.7 (0.3) b0.2 (0.1)0.3 (0.1)0.2 (0.0) b0.4 (0.1)3.2 (0.3)4.3 (0.3)
Mean (SEM), various letters in ~ a tower indicate far-reaching differences ns p n = 15, β(1-1) n = 9 every others n = 10.

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