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Farazi M, Houghton MJ, Cardoso BR, Murray M, Williamson G. Inhibitory effect of extracts from edible parts of nuts on α-amylase activity: a systematic review. Food Funct 2024; 15:5209-5223. [PMID: 38717256 DOI: 10.1039/d4fo00414k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2024]
Abstract
Elevated blood glucose concentration is a risk factor for developing metabolic dysfunction and insulin resistance, leading to type 2 diabetes and cardiovascular diseases. Nuts have the potential to inhibit α-amylase activity, and so lower postprandial glucose, due to their content of polyphenols and other bioactive compounds. We conducted a systematic literature review to assess the ability of extracts from commonly consumed edible parts of nuts to inhibit α-amylase. Among the 31 included papers, only four utilised human α-amylases. These papers indicated that polyphenol-rich chestnut skin extracts exhibited strong inhibition of both human salivary and pancreatic α-amylases, and that a polyphenol-rich almond skin extract was a potent inhibitor of human salivary α-amylase. The majority of the reviewed studies utilised porcine pancreatic α-amylase, which has ∼86% sequence homology with the corresponding human enzyme but with some key amino acid variations located within the active site. Polyphenol-rich extracts from chestnut, almond, kola nut, pecan and walnut, and peptides isolated from cashew, inhibited porcine pancreatic α-amylase. Some studies used α-amylases sourced from fungi or bacteria, outcomes from which are entirely irrelevant to human health, as they have no sequence homology with the human enzyme. Given the limited research involving human α-amylases, and the differences in inhibition compared to porcine enzymes and especially enzymes from microorganisms, it is recommended that future in vitro experiments place greater emphasis on utilising enzymes sourced from humans to facilitate a reliable prediction of effects in intervention studies.
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Affiliation(s)
- Mena Farazi
- Department of Nutrition, Dietetics and Food, Monash University, BASE Facility, Level 1, 264 Ferntree Gully Road, Notting Hill, VIC 3168, Australia.
- Victorian Heart Institute, Monash University, 631 Blackburn Road, Clayton, VIC 3168, Australia
| | - Michael J Houghton
- Department of Nutrition, Dietetics and Food, Monash University, BASE Facility, Level 1, 264 Ferntree Gully Road, Notting Hill, VIC 3168, Australia.
- Victorian Heart Institute, Monash University, 631 Blackburn Road, Clayton, VIC 3168, Australia
| | - Barbara R Cardoso
- Department of Nutrition, Dietetics and Food, Monash University, BASE Facility, Level 1, 264 Ferntree Gully Road, Notting Hill, VIC 3168, Australia.
- Victorian Heart Institute, Monash University, 631 Blackburn Road, Clayton, VIC 3168, Australia
| | - Margaret Murray
- Department of Nutrition, Dietetics and Food, Monash University, BASE Facility, Level 1, 264 Ferntree Gully Road, Notting Hill, VIC 3168, Australia.
- School of Health Sciences, Swinburne University of Technology, John St, Hawthorn, VIC 3122, Australia
| | - Gary Williamson
- Department of Nutrition, Dietetics and Food, Monash University, BASE Facility, Level 1, 264 Ferntree Gully Road, Notting Hill, VIC 3168, Australia.
- Victorian Heart Institute, Monash University, 631 Blackburn Road, Clayton, VIC 3168, Australia
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2
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Pinto D, López-Yerena A, Lamuela-Raventós R, Vallverdú-Queralt A, Delerue-Matos C, Rodrigues F. Predicting the effects of in-vitro digestion in the bioactivity and bioaccessibility of antioxidant compounds extracted from chestnut shells by supercritical fluid extraction - A metabolomic approach. Food Chem 2024; 435:137581. [PMID: 37776654 DOI: 10.1016/j.foodchem.2023.137581] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 09/13/2023] [Accepted: 09/22/2023] [Indexed: 10/02/2023]
Abstract
Chestnut (Castanea sativa) shells (CS) are an undervalued antioxidant-rich by-product. This study explores the impact of in-vitro digestion on the bioaccessibility, bioactivity, and metabolic profile of CS extract prepared by Supercritical Fluid Extraction, aiming its valorization for nutraceutical applications. The results demonstrated significantly (p < 0.05) lower phenolic concentrations retained after digestion (38.57 µg gallic acid equivalents/mg dry weight (DW)), reaching 30% of bioaccessibility. The CS extract showed antioxidant/antiradical, hypoglycemic, and neuroprotective properties after in-vitro digestion, along with upmodulating effects on antioxidant enzymes activities and protection against lipid peroxidation. The metabolic profile screened by LC-ESI-LTQ-Orbitrap-MS proved the biotransformation of complex phenolic acids, flavonoids, and tannins present in the undigested extract (45.78 µg/mg DW of total phenolic concentration) into hydroxybenzoic, phenylpropanoic, and phenylacetic acids upon digestion (35.54 µg/mg DW). These findings sustain the valorization of CS extract as a promising nutraceutical ingredient, delivering polyphenols with proven bioactivity even after in-vitro digestion.
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Affiliation(s)
- Diana Pinto
- REQUIMTE/LAQV, ISEP, Polytechnic of Porto, Rua Dr. António Bernardino de Almeida, 4249-015 Porto, Portugal.
| | - Anallely López-Yerena
- Polyphenol Research Group, Department of Nutrition, Food Science and Gastronomy, Xia, Faculty of Pharmacy and Food Sciences, Institute of Nutrition and Food Safety (INSA-UB), University of Barcelona, 08028 Barcelona, Spain; Consorcio CIBER, M.P. Fisiopatología de la Obesidad y la Nutrición (CIBERObn), Instituto de Salud Carlos III (ISCIII), 28029 Madrid, Spain
| | - Rosa Lamuela-Raventós
- Polyphenol Research Group, Department of Nutrition, Food Science and Gastronomy, Xia, Faculty of Pharmacy and Food Sciences, Institute of Nutrition and Food Safety (INSA-UB), University of Barcelona, 08028 Barcelona, Spain; Consorcio CIBER, M.P. Fisiopatología de la Obesidad y la Nutrición (CIBERObn), Instituto de Salud Carlos III (ISCIII), 28029 Madrid, Spain
| | - Anna Vallverdú-Queralt
- Polyphenol Research Group, Department of Nutrition, Food Science and Gastronomy, Xia, Faculty of Pharmacy and Food Sciences, Institute of Nutrition and Food Safety (INSA-UB), University of Barcelona, 08028 Barcelona, Spain; Consorcio CIBER, M.P. Fisiopatología de la Obesidad y la Nutrición (CIBERObn), Instituto de Salud Carlos III (ISCIII), 28029 Madrid, Spain
| | - Cristina Delerue-Matos
- REQUIMTE/LAQV, ISEP, Polytechnic of Porto, Rua Dr. António Bernardino de Almeida, 4249-015 Porto, Portugal
| | - Francisca Rodrigues
- REQUIMTE/LAQV, ISEP, Polytechnic of Porto, Rua Dr. António Bernardino de Almeida, 4249-015 Porto, Portugal.
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3
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Pinto D, Almeida A, López-Yerena A, Pinto S, Sarmento B, Lamuela-Raventós R, Vallverdú-Queralt A, Delerue-Matos C, Rodrigues F. Appraisal of a new potential antioxidants-rich nutraceutical ingredient from chestnut shells through in-vivo assays – A targeted metabolomic approach in phenolic compounds. Food Chem 2023; 404:134546. [DOI: 10.1016/j.foodchem.2022.134546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 09/17/2022] [Accepted: 10/05/2022] [Indexed: 11/22/2022]
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Castanea sativa shells: A review on phytochemical composition, bioactivity and waste management approaches for industrial valorization. Food Res Int 2021; 144:110364. [PMID: 34053557 DOI: 10.1016/j.foodres.2021.110364] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 04/03/2021] [Accepted: 04/07/2021] [Indexed: 11/21/2022]
Abstract
Castanea sativa is an outstanding species that represents a valuable natural resource for rural populations. C. sativa shells (CSS), an abundant agro-industrial by-product generated during chestnut peeling process, is commonly discarded or used as fuel. Nevertheless, CSS produced are not depleted by this application and huge amounts are still available, being particularly rich in bioactive compounds (polyphenols, vitamin E, lignin and oligosaccharides) with health benefits. Phytochemical studies reported not only antioxidant and antimicrobial activities, but also anti-inflammatory, anticancer, hypolipidemic, hypoglycemic and neuroprotective activities. The application of a suitable extraction technique is required for the isolation of bioactive compounds, being green extraction technologies outstanding for the industrial recovery of chestnut shells' bioactive compounds. CSS were highlighted as remarkable sources of functional ingredients with promising applications in food and nutraceutical fields, mainly as natural antioxidants and effective prebiotics. This review aims to summarize the phytochemical composition and pro-healthy properties of CSS, emphasizing the sustainable extraction techniques employed in the recovery of bioactive compounds and their potential applications in food and nutraceutical industries.
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Oladeji OS, Oyebamiji AK. Stellaria media (L.) Vill.- A plant with immense therapeutic potentials: phytochemistry and pharmacology. Heliyon 2020; 6:e04150. [PMID: 32548330 PMCID: PMC7284062 DOI: 10.1016/j.heliyon.2020.e04150] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 04/20/2020] [Accepted: 06/02/2020] [Indexed: 02/07/2023] Open
Abstract
Stellaria media Vill. is a representative of Caryophyllaceae family. The plant is widely dispersed all over the world and has been used as therapeutic substance since time immemorial. This review is aimed at exploring the chemical constituents and pharmacological activities of S. media. The findings revealed important secondary metabolites such as flavonoid, oligosaccharide stellariose, anthraquinone derivatives, fatty acid, steroid saponins and phenolic compounds. These bioactive metabolites displayed diverse pharmacological activities such as anti-obesity, antifungal, antibacterial, antioxidant, anti-proliferative, anti-inflammatory, analgesic, antidiabetic and anxiolytic activities. All findings revealed that S. media is a major species of Caryophyllaceae family. However, bioactive constituents and pharmacological potential of are not well appraised. Hence, extracts with established pharmacological activities should be subjected to bioassay guided isolation so as to obtain compounds with novel structural moieties prior to toxicogenetic appraisals.
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Affiliation(s)
- Oluwole Solomon Oladeji
- Natural Products Research Unit, Department of Physical Sciences, Industrial Chemistry Programme, College of Pure and Applied Sciences, Landmark University, PMB 1001, Omu-Aran, Nigeria
| | - Abel Kolawole Oyebamiji
- Department of Basic Sciences, Faculty of Sciences, Adeleke University, Ede, Nigeria
- Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
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Tsujita T. Persimmon-Tannin, an α-Amylase Inhibitor, Retards Carbohydrate Absorption in Rats. J Nutr Sci Vitaminol (Tokyo) 2016; 62:192-7. [PMID: 27465726 DOI: 10.3177/jnsv.62.192] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Inhibitors of carbohydrate-hydrolyzing enzymes play an important role in controlling postprandial blood glucose levels. Thus the effect of persimmon tannin on pancreatic α-amylase and intestinal α-glucosidase has been investigated. Persimmon tannin inhibits pancreatic α-amylase and intestinal α-glucosidase in a concentration-dependent manner with the 50% inhibition concentration (IC50) for amylase, maltase and sucrase being 1.7 μg/mL, 632 μg/mL and 308 μg/mL, respectively. The effect of persimmon-tannin extract on carbohydrate absorption in rats has also been investigated. Oral administration of persimmon tannin to normal rats fed cornstarch (2 g/kg body weight) significantly suppressed the increase in blood glucose levels and the area under the curve (AUC) after starch loading in a dose-dependent manner. The effective dose of persimmon tannin required to achieve 50% suppression of the rise in blood glucose level was estimated to be 300 mg/kg body weight. Administration of persimmon tannin to rats fed maltose or sucrose delayed the increase of blood glucose level and slightly suppressed AUC, but not significantly. These results suggest that persimmon tannin retards absorption of carbohydrate and reduces post-prandial hyperglycemia mainly through inhibition of α-amylase.
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Affiliation(s)
- Takahiro Tsujita
- Division of Analytical Bio-medicine, Advanced Research Support Center, Ehime University
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7
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Polyphenol- and fibre-rich dried fruits with green tea attenuate starch-derived postprandial blood glucose and insulin: a randomised, controlled, single-blind, cross-over intervention. Br J Nutr 2016; 116:443-50. [PMID: 27278405 DOI: 10.1017/s0007114516002221] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Polyphenol- and fibre-rich foods (PFRF) have the potential to affect postprandial glycaemic responses by reducing glucose absorption, and thus decreasing the glycaemic response of foods when consumed together. A randomised, single-blind, cross-over study was conducted on sixteen healthy volunteers to test whether PFRF could attenuate postprandial blood glucose in healthy volunteers when added to a source of carbohydrate (starch in bread). This is the first study to examine the effects of a meal comprised of components to inhibit each stage of the biochemical pathway, leading up to the appearance of glucose in the blood. The volunteers were fasted and attended four visits: two control visits (bread, water, balancing sugars) and two test visits (single and double dose of PFRF) where they consumed bread, water and PFRF. Blood samples were collected at 0 (fasted), 15, 30, 45, 60, 90, 120, 150 and 180 min after consumption. The PFRF components were tested for α-amylase and α-glucosidase inhibitory potential in vitro. Plasma glucose was lower after consumption of both doses compared with controls: lower dose, change in mean incremental areas under the glucose curves (IAUC)=-27·4 (sd 7·5) %, P<0·001; higher dose, IAUC=-49·0 (sd 15·3) %, P<0·001; insulin IAUC was also attenuated by-46·9 (sd 13·4) %, P<0·01. Consistent with this, the polyphenol components of the PFRF inhibited α-amylase (green tea, strawberry, blackberry and blackcurrant) and α-glucosidase (green tea) activities in vitro. The PFRF have a pronounced and significant lowering effect on postprandial blood glucose and insulin response in humans, due in part to inhibition of α-amylase and α-glucosidase, as well as glucose transport.
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Nyambe-Silavwe H, Villa-Rodriguez JA, Ifie I, Holmes M, Aydin E, Jensen JM, Williamson G. Inhibition of human α-amylase by dietary polyphenols. J Funct Foods 2015. [DOI: 10.1016/j.jff.2015.10.003] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Tsujita T, Shintani T, Sato H. Preparation and characterisation of peanut seed skin polyphenols. Food Chem 2013; 151:15-20. [PMID: 24423496 DOI: 10.1016/j.foodchem.2013.11.072] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 09/18/2013] [Accepted: 11/12/2013] [Indexed: 10/26/2022]
Abstract
Using α-amylase inhibition as a separation guide, polyphenolic compounds from peanut seed skin were prepared. During preparation, specific α-amylase inhibitory activities were increased about 4-fold. High-resolution MALDI-TOF mass spectra showed that the structure of this sample was a series of polyflavan-3-ols, up to 15-mer, composed of catechin/epicatechin units together with several afzelechin/epiafzelechin units and gallocatechin/epigallocatechin units. The observed precious mass values suggest that the polymers consist of both interflavanoid C-C linkages (A-type) and interflavanoid ether linkages (B-type). Oral administration of the polyphenol fraction to rats fed corn starch significantly suppressed an increase in blood glucose levels in a dose dependent manner. Administration of the polyphenol fraction to rats fed maltose or sucrose delayed the increase in blood glucose levels. These results suggest peanut seed skin contains polyphenols with strong α-amylase inhibitory activity, which retard absorption of carbohydrates and mainly function through inhibition of α-amylase.
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Affiliation(s)
- Takahiro Tsujita
- Bioscience, Integrated Center for Sciences, Ehime University, Shitsukawa, Toon, Ehime, Japan.
| | - Tomoyoshi Shintani
- Ehime Institute of Industrial Technology, 2-5-48 Higashimura-minami, Imabari, Ehime, Japan
| | - Hiroaki Sato
- Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki, Japan
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Tsujita T, Shintani T, Sato H. α-Amylase inhibitory activity from nut seed skin polyphenols. 1. Purification and characterization of almond seed skin polyphenols. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:4570-4576. [PMID: 23614772 DOI: 10.1021/jf400691q] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Using α-amylase inhibition as a separation guide, polyphenolic compounds from almond ( Prunus dulcis ) seed skin were purified using ultrafiltration and Sephadex LH-20 and ODS columns. The purified fraction specifically and strongly inhibited α-amylase; the IC50 value was 2.2 μg/mL for pig pancreatic α-amylase. The fraction contained about 62% of the total polyphenols, 33.8% flavanol-type tannins and 30% procyanidins. Oral administration of the polyphenol fraction to rats fed corn starch significantly suppressed an increase in blood glucose levels and area under the curve (AUC), in a dose-dependent manner. High-resolution MALDI-TOF mass spectra showed that the structure of this sample is a series of polyflavan-3-ol polymers composed of catechin/epicatechin units and gallocatechin/epigallocatechin units up to 11-mer with several interflavanoid ether linkages. The results suggest almond seed skin contains highly polymerized polyphenols with strong α-amylase inhibitory activity, which retard absorption of carbohydrate.
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Affiliation(s)
- Takahiro Tsujita
- Bioscience, Integrated Center for Sciences, Ehime University, Shitsukawa, Toon, Ehime 791-0295, Japan.
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Khalil-Moghaddam S, Ebrahim-Habibi A, Pasalar P, Yaghmaei P, Hayati-Roodbari N. Reflection on design and testing of pancreatic alpha-amylase inhibitors: an in silico comparison between rat and rabbit enzyme models. ACTA ACUST UNITED AC 2012; 20:77. [PMID: 23352052 PMCID: PMC3584935 DOI: 10.1186/2008-2231-20-77] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Accepted: 11/13/2012] [Indexed: 11/12/2022]
Abstract
Background Inhibitors of pancreatic alpha-amylase are potential drugs to treat diabetes and obesity. In order to find compounds that would be effective amylase inhibitors, in vitro and in vivo models are usually used. The accuracy of models is limited, but these tools are nonetheless valuable. In vitro models could be used in large screenings involving thousands of chemicals that are tested to find potential lead compounds. In vivo models are still used as preliminary mean of testing compounds behavior in the whole organism. In the case of alpha-amylase inhibitors, both rats and rabbits could be chosen as in vivo models. The question was which animal could present more accuracy with regard to its pancreatic alpha-amylase. Results As there is no crystal structure of these enzymes, a molecular modeling study was done in order to compare the rabbit and rat enzymes with the human one. The overall result is that rabbit enzyme could probably be a better choice in this regard, but in the case of large ligands, which could make putative interactions with the −4 subsite of pancreatic alpha-amylase, interpretation of results should be made cautiously. Conclusion Molecular modeling tools could be used to choose the most suitable model enzyme that would help to identify new enzyme inhibitors. In the case of alpha-amylase, three-dimensional structures of animal enzymes show differences with the human one which should be taken into account when testing potential new drugs.
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Etxeberria U, de la Garza AL, Campión J, Martínez JA, Milagro FI. Antidiabetic effects of natural plant extracts via inhibition of carbohydrate hydrolysis enzymes with emphasis on pancreatic alpha amylase. Expert Opin Ther Targets 2012; 16:269-97. [PMID: 22360606 DOI: 10.1517/14728222.2012.664134] [Citation(s) in RCA: 226] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
INTRODUCTION The increasing prevalence of type 2 diabetes mellitus and the negative clinical outcomes observed with the commercially available anti-diabetic drugs have led to the investigation of new therapeutic approaches focused on controlling postprandrial glucose levels. The use of carbohydrate digestive enzyme inhibitors from natural resources could be a possible strategy to block dietary carbohydrate absorption with less adverse effects than synthetic drugs. AREAS COVERED This review covers the latest evidence regarding in vitro and in vivo studies in relation to pancreatic alpha-amylase inhibitors of plant origin, and presents bioactive compounds of phenolic nature that exhibit anti-amylase activity. EXPERT OPINION Pancreatic alpha-amylase inhibitors from traditional plant extracts are a promising tool for diabetes treatment. Many studies have confirmed the alpha-amylase inhibitory activity of plants and their bioactive compounds in vitro, but few studies corroborate these findings in rodents and very few in humans. Thus, despite some encouraging results, more research is required for developing a valuable anti-diabetic therapy using pancreatic alpha-amylase inhibitors of plant origin.
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Affiliation(s)
- Usune Etxeberria
- University of Navarra, Department of Nutrition, Food Science, Physiology and Toxicology, C/Irunlarrea, 1 31008, Pamplona, Spain
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Tsujita T, Yamada M, Takaku T, Shintani T, Teramoto K, Sato T. Purification and characterization of polyphenols from chestnut astringent skin. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:8646-8654. [PMID: 21777007 DOI: 10.1021/jf201679q] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Polyphenolic compounds from chestnut astringent skin (CAS) were purified by dialysis, using Diaion HP-20 and Sephadex LH-20 columns. During purification, specific α-amylase inhibitory activities were increased about 3.4-fold, and the 50% inhibition value was 5.71 μg/mL in the Sephadex LH-20 fraction (SE-fraction). The SE-fraction contained about 67% of the total polyphenols, 57.3% of the flavanol-type tannins, and 51.3% of the procyanidins. Strong antioxidant activity was observed in the SE-fraction. Oral administration of the SE-fraction in rats fed corn starch significantly suppressed an increase in blood glucose levels. The SE-fraction contained gallic acid and ellagic acid. The MALDI-TOF spectrum showed a peak series exhibiting a mass increment of 288 Da, reflecting the variation in the number of catechin/epicatechin units. Our results suggest CAS contains polyphenols with strong α-amylase inhibitory activity. The data also suggest CAS polyphenols might be oligomeric proanthocyanidins with gallic acid and ellagic acid.
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Affiliation(s)
- Takahiro Tsujita
- Bioscience, Integrated Center for Sciences, Ehime University, Shitsukawa, Toon, Ehime, Japan.
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Narita Y, Inouye K. Inhibitory effects of chlorogenic acids from green coffee beans and cinnamate derivatives on the activity of porcine pancreas α-amylase isozyme I. Food Chem 2011. [DOI: 10.1016/j.foodchem.2011.02.013] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ikarashi N, Takeda R, Ito K, Ochiai W, Sugiyama K. The inhibition of lipase and glucosidase activities by acacia polyphenol. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2011; 2011:272075. [PMID: 21660093 PMCID: PMC3096474 DOI: 10.1093/ecam/neq043] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2010] [Accepted: 04/09/2010] [Indexed: 12/31/2022]
Abstract
Acacia polyphenol (AP) extracted from the bark of the black wattle tree (Acacia mearnsii) is rich in unique catechin-like flavan-3-ols, such as robinetinidol and fisetinidol. In an in vitro study, we measured the inhibitory activity of AP on lipase and glucosidase. In addition, we evaluated the effects of AP on absorption of orally administered olive oil, glucose, maltose, sucrose and starch solution in mice. We found that AP concentration-dependently inhibited the activity of lipase, maltase and sucrase with an IC50 of 0.95, 0.22 and 0.60 mg ml−1, respectively. In ICR mice, olive oil was administered orally immediately after oral administration of AP solution, and plasma triglyceride concentration was measured. We found that AP significantly inhibited the rise in plasma triglyceride concentration after olive oil loading. AP also significantly inhibited the rise in plasma glucose concentration after maltose and sucrose loading, and this effect was more potent against maltose. AP also inhibited the rise in plasma glucose concentration after glucose loading and slightly inhibited it after starch loading. Our results suggest that AP inhibits lipase and glucosidase activities, which leads to a reduction in the intestinal absorption of lipids and carbohydrates.
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Affiliation(s)
- Nobutomo Ikarashi
- Department of Clinical Pharmacokinetics, Hoshi University, Tokyo 142-8501, Japan
| | - Rumi Takeda
- Department of Clinical Pharmacokinetics, Hoshi University, Tokyo 142-8501, Japan
| | - Kiyomi Ito
- Department of Clinical Pharmacokinetics, Hoshi University, Tokyo 142-8501, Japan
| | - Wataru Ochiai
- Department of Clinical Pharmacokinetics, Hoshi University, Tokyo 142-8501, Japan
| | - Kiyoshi Sugiyama
- Department of Clinical Pharmacokinetics, Hoshi University, Tokyo 142-8501, Japan
- *Kiyoshi Sugiyama:
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Kim JS, Jeon WJ, You HJ, Park MS, Ji GE. Inhibitory activities of Rubi Fructus on digestive enzymes. Food Sci Biotechnol 2010. [DOI: 10.1007/s10068-010-0166-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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17
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TSUJITA T, TAKAKU T. Mechanism of the Inhibitory Action of Chestnut Astringent Skin Extract on Carbohydrate Absorption. J Nutr Sci Vitaminol (Tokyo) 2008; 54:416-21. [DOI: 10.3177/jnsv.54.416] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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