Effects of Mulberry Leaf and Corn Silk Extracts Against α-Amylase and α-Glucosidase In Vitro and on Postprandial Glucose in Prediabetic Individuals: A Randomized Crossover Trial

Postprandial glycemic effects of lactose-hydrolyzed milk supplemented with mulberry leaf and corn silk extracts in adults with type 2 diabetes: A randomized crossover trial.

The potential of mulberry (Morus alba L.) leaf extract against pro-aggregant tau-mediated inflammation and mitochondrial dysfunction.

The purpose of this study was to investigate the anti-inflammatory and antiobesity effect of combinational mulberry leaf extract (MLE) and mulberry fruit extract (MFE) in a high-fat (HF) diet-induced obese mice. Mice were fed a control diet or a HF diet for nine weeks. After obesity was induced, the mice were administered with single MLE at low dose (133 mg/kg/day, LMLE) and high dose (333 mg/kg/day, HMLE) or combinational MLE and MFE (MLFE) at low dose (133 mg MLE and 67 mg MFE/kg/day, LMLFE) and high dose (333 mg MLE and 167 mg MFE/kg/day, HMLFE) by stomach gavage for 12 weeks. The mulberry leaf and fruit extract treatment for 12 weeks did not show liver toxicity. The single MLE and combinational MLFE treatments significantly decreased plasma triglyceride, liver lipid peroxidation levels and adipocyte size and improved hepatic steatosis as compared with the HF group. The combinational MLFE treatment significantly decreased body weight gain, fasting plasma glucose and insulin, and homeostasis model assessment of insulin resistance. HMLFE treatment significantly improved glucose control during intraperitoneal glucose tolerance test compared with the HF group. Moreover, HMLFE treatment reduced protein levels of oxidative stress markers (manganese superoxide dismutase) and inflammatory markers (monocyte chemoattractant protein-1, inducible nitric oxide synthase, C-reactive protein, tumour necrosis factor-α and interleukin-1) in liver and adipose tissue. Taken together, combinational MLFE treatment has potential antiobesity and antidiabetic effects through modulation of obesity-induced inflammation and oxidative stress in HF diet-induced obesity.

In this work, mulberry (Morus nigra L.) leaf extract was added in poly(vinyl alcohol) (PVA)-based films and its impact on the film’s properties was evaluated. In addition, HCl and glycerol were studied for their use as additives to prepare PVA-based films. The results showed that HCl and glycerol have minimal impacts on the films’ appearance, while mulberry leaf extract imparted green colour to the films produced, mainly due to the presence of green pigments. Moreover, the results suggested that a significant interaction has occurred between the polymer matrix and leaf extract, contributing to a more compact and uniform film morphology. The tensile strengths of the films increased from 21.38 to 28.28 MPa after the addition of mulberry leaf extract. Additionally, the films were tested for their application as food wrapping films. Overall, the results showed that PVA-based films incorporated with mulberry leaf extract have higher capability to preserve the freshness of food when compared to commercial cling wraps from brands such as Diamond and Glad. Appropriate proportions of additives (mulberry leaf extract, HCl and glycerol) used in the formulation of P-GH-M20 films showed improvement in its mechanical properties and food preservation capability.

Effects of Multi-Ingredient Nutritional Drink Including Mulberry Leaf Extract (MLE) on Postprandial Glycemic and Appetite Responses in Healthy Chinese Adults

Objective: Postprandial glucose is a predictor of later diabetes and vascular complications. The study aims to identify determinants of inter-individual variability in postprandial responses in healthy and prediabetic individuals. Methods: A multi-centre study in the UK and the U.S. assessed the postprandial insulin, glucose and triglyceride responses to a dietary challenge (50g fat and 85g carbohydrate) in the clinic. The inter-individual variability in postprandial glycemic responses was then measured over 2 weeks for isocaloric meals of different macronutrient content using a continuous glucose monitor (CGM). Interim analyses of the 30- and 120-min insulin rises and meal content contributions to the incremental glucose area under the curve (iAUC) were performed in 573 individuals (age 47.5 (19-66) years, BMI 25.7 (17-53) kg/m2; F=76%; n=108 with HbA1c > 5.7% [prediabetic]). Results: A machine learning algorithm showed that 29% of variation in glucose iAUC of at home meals was explained by the meal’s macronutrient content. In clinic, the 30min insulin postprandial rise (strongly associated with same meal’s glucose iAUC r=0.39 p=1.25x10[-20]) was not correlated with at-home postprandial glucose iAUCs in healthy (r=-0.012 p=0.62) or prediabetic (r=-0.074 p=0.17) individuals after adjustment for age, sex and BMI. However, 2hr insulin rise was significantly associated in healthy (r=0.13 p=1.6 x 10[-7]) and prediabetic (r=0.22 p=3.2x10[-5]) individuals, explaining 15% of the variance in glucose iAUCs. This was the same for all meals regardless of macronutrient content. Conclusions: The 2hr postprandial insulin rise is a predictor of glycemic responses to different meal types. Ongoing exploration in PREDICT I using additional environmental, genetic and microbiome variables should advance our ability to predict an individual’s response to food. Disclosure P.W. Franks: Board Member; Self; Zoe Ltd. Research Support; Self; AstraZeneca, Boehringer Ingelheim International GmbH, Lilly Diabetes, Novo Nordisk A/S, Novo Nordisk Foundation, Sanofi, Servier. S. Berry: Consultant; Self; Zoe Ltd. A.T. Chan: Consultant; Self; Bayer AG, Janssen Pharmaceuticals, Inc., Pfizer Inc. R.J. Davies: Employee; Self; Zoe Global Limited. D.A. Drew: Consultant; Spouse/Partner; PathAI. T.D. Spector: Stock/Shareholder; Self; Zoe Global Ltd. A.M. Valdes: Consultant; Self; Zoe Ltd Global. Research Support; Self; Pfizer Inc. Funding UK National Institute for Health Research; UK Wellcome Trust; Zoe Global Limited

This study evaluates how white mulberry (Morus alba L.) leaf extracts affect the growth, antioxidant activity, and immune response in Nile tilapia Oreochromis niloticus. Mulberry leaf extracts were obtained through aqueous extraction (AE) and ethanol extraction (EE). Powder of mulberry leaf (PML) was added directly to feed and compared with the effects of feeds supplemented with the different extracts. Fish were divided into eight groups for an 8-week feeding trial where they were fed the basal diet or supplemented with 10% PML, 10% AE, 20% AE, 40% AE, 10% EE, 20% EE, or 40% EE. The inclusion of mulberry leaf extract obtained with either method showed better effects on fish growth performance, antioxidant activities and acid phosphatase activity (ACP) in serum, immune cytokine expression, and intestinal morphology as compared with controls or fish fed the 10% PML diet. The specific growth rate was significantly higher in the 10% AE, 10% EE, and 20% EE groups compared with all other groups (P<0.05). Catalase activity was significantly greater in most groups fed an extract, and in the 10% PML group, when compared with controls. Similarly, ACP, interleukin (IL)-1, and IL-2 expression was significantly increased in groups fed an extract, and in the 10% PML group, when compared with controls (P<0.05). IL- 1, IL-2, IL-10, and Toll-like receptor 2 expression was significantly greater in the 10% EE group than in the 10% PML and 10% AE groups (P<0.05). Villus length in the middle intestine was significantly increased in the 10% AE and 10% EE groups compared with controls and the 10% PML group (P<0.05). Thus, 10% mulberry leaf ethanol extract added to feed is recommended for enhancing the growth rate and health of cultured Nile tilapia.

This study investigates the impact of mulberry leaf extract on the viability, plasma membrane integrity, and motility of spermatozoa from male white rats (Rattus norvegicus) exposed to e-cigarette smoke. A total of twenty-five male rats were divided into five groups: negative control (NC), positive control (PC), T1, T2, and T3. All groups, except for the NC group, were exposed to e-cigarette smoke. Rats in the T1, T2, and T3 groups received mulberry leaf extract in doses of 100, 200, and 400 mg/kg bw, respectively, while the NC and PC groups were given a placebo of 1% Na-CMC. Both the mulberry leaf extract and the placebo were administered daily, beginning three days prior to the start of e-cigarette smoke exposure, which lasted for 28 days. Results showed that spermatozoa motility, plasma membrane integrity, and viability in the experimental groups were significantly lower than those in the NC group (p <0.05). Conversely, rats in the T1, T2, and T3 groups that received mulberry leaf extract demonstrated significantly greater spermatozoa viability, plasma membrane integrity, and motility compared to the PC group (p <0.05). The T3 group exhibited the most pronounced improvements, with significantly enhanced spermatozoa viability, membrane integrity, and motility (p <0.05) relative to the PC group. These results indicate that mulberry (Morus alba L.) leaf extract enhanced spermatozoa viability, plasma membrane integrity, and motility in white rats (Rattus norvegicus) subjected to e-cigarette smoke.

The qualitative changes of the fermented beverage prepared from corn silk (Zea mays L.) and mulberry leaf (Morus alba) extracts were investigated. The thickness of cellulose was 7.17-8.30 mm after 15 days of fermentation. Moreover, the pH significantly decreased to 3.68-3.93 (p<0.05) and the total acidity increased significantly to 3.41-3.77% (p<0.05), indicating Gluconacetobacter xylinus fermentation activity. The total flavonoid and phenol contents were 37.42-164.65 μg/mL and 138.67-620.17 μg/mL, respectively. The DPPH and ABTS radical scavenging and reducing powers were 23.87-69.39%, 59.92-75.68% and 27.27-82.33%, respectively. Corn silk showed antimicrobial activity for all test strains, especially Acinetobacter calcoaceticus, Bacillus coagulans and Escherichia coli. In addition, although antidiabetic activity of the fermented beverage (22.51-33.66%) was lower than that of acarbose control, the fermented beverage may prove to be a natural alternative. There was no observable synergy between the active ingredients in the beverage. Further, mulberry leaf had a significantly higher contribution to the total flavonoid and phenol contents, as well as the antioxidant, antidiabetic, and antimicrobial activities, compared to corn silk. The results of the study confirmed the functional characteristics of the novel fermented beverage. Further evaluation is needed for the analysis of sensory characteristics of the novel fermented beverage.

A novel heat-stable angiotensin-converting enzyme zinc-binding motif inhibitory peptide identified from corn silk

Vasodilatory effects of mulberry (Morus spp.) leaf extract on porcine cerebral arteries in vitro: Possible underlying mechanisms

Survival of probiotics in soyoghurt plus mulberry (c.v. Chiang Mai 60) leaf extract during refrigerated storage and their ability to tolerate gastrointestinal transit

Study background: Hypercholesterolemia causes arteriosclerosis, a risk factor for cerebral or myocardial infarctions.Prevention of hypercholesterolemia by improving dietary habits has recently attracted attention in many countries.It has been reported that the leaves of the mulberry plant, Morus alba L., which is commonly used for tea in Asian countries, can ameliorate hypercholesterolemic conditions. Method:To determine its mechanism of action, we performed gene expression profiling of the liver of mice fed a high-cholesterol diet and a polyphenol-rich mulberry leaf extract containing abundant quercetin and kaempferol for 4 weeks. Results:The levels of total cholesterol, low-density lipoprotein cholesterol, aspartate aminotransferase, alanine aminotransferase, and lactate dehydrogenase in plasma, and level of total cholesterol in the liver were significantly lower in the mice treated with the mulberry leaf extract than that in the control group mice.DNA microarray analysis revealed that mulberry extract downregulated the expression of genes involved in cholesterol biosynthesis, including hydroxymethylglutaryl-CoA reductase gene, and upregulated the transcription of peroxisome proliferator-activated receptor (PPAR)α and γ, transcriptional factors known to regulate lipid metabolism or immunity, and their target genes.Additionally, the mulberry extract stimulated both innate and acquired immunity, including the induction of scavenger and Toll-like receptors and the activation of pathways in various lymphocytes, such as macrophages, eosinophils, neutrophils, natural killer cells, B cells, and T cells. Conclusion:The results obtained in this study suggest that quercetin and kaempferol in the mulberry leaf induce the activation of PPARα and PPARγ, transcription of Ppara and Pparg genes, and stimulation of PPAR signaling pathways.These phenomena ultimately lead to the reduction of cholesterol synthesis and immunostimulation.

For centuries, mulberry leaf has been used in traditional Chinese medicine for the treatment of diabetes. This study aims to test the prevention effects of a proprietary mulberry leaf extract (MLE) and a formula consisting of MLE, fenugreek seed extract, and cinnamon cassia extract (MLEF) on insulin resistance development in animals. MLE was refined to contain 5% 1-deoxynojirimycin by weight. MLEF was formulated by mixing MLE with cinnamon cassia extract and fenugreek seed extract at a 6:5:3 ratio (by weight). First, the acute toxicity effects of MLE on ICR mice were examined at 5 g/kg BW dose. Second, two groups of normal rats were administrated with water or 150 mg/kg BW MLE per day for 29 days to evaluate MLE’s effect on normal animals. Third, to examine the effects of MLE and MLEF on model animals, sixty SD rats were divided into five groups, namely, (1) normal, (2) model, (3) high-dose MLE (75 mg/kg BW) treatment; (4) low-dose MLE (15 mg/kg BW) treatment; and (5) MLEF (35 mg/kg BW) treatment. On the second week, rats in groups (2)-(5) were switched to high-energy diet for three weeks. Afterward, the rats were injected (ip) with a single dose of 105 mg/kg BW alloxan. After four more days, fasting blood glucose, post-prandial blood glucose, serum insulin, cholesterol, and triglyceride levels were measured. Last, liver lysates from animals were screened with 650 antibodies for changes in the expression or phosphorylation levels of signaling proteins. The results were further validated by Western blot analysis. We found that the maximum tolerance dose of MLE was greater than 5 g/kg in mice. The MLE at a 150 mg/kg BW dose showed no effect on fast blood glucose levels in normal rats. The MLE at a 75 mg/kg BW dose and MLEF at a 35 mg/kg BW dose, significantly (p < 0.05) reduced fast blood glucose levels in rats with impaired glucose and lipid metabolism. In total, 34 proteins with significant changes in expression and phosphorylation levels were identified. The changes of JNK, IRS1, and PDK1 were confirmed by western blot analysis. In conclusion, this study demonstrated the potential protective effects of MLE and MLEF against hyperglycemia induced by high-energy diet and toxic chemicals in rats for the first time. The most likely mechanism is the promotion of IRS1 phosphorylation, which leads to insulin sensitivity restoration.

The assessment of composition, biological properties, safety and molecular docking of corn silk (Zea mays L.) extracts from the valorization of agricultural waste products in Thailand