Bean Extract Research Articles

Edible Alginate–Lecithin Films Enriched with Different Coffee Bean Extracts: Formulation, Non-Cytotoxic, Anti-Inflammatory and Antimicrobial Properties

The aim of this study was to analyze the functional properties of newly obtained films based on sodium alginate and lecithin with the addition of antioxidant-rich coffee extracts and to verify their potential as safe edible food packaging materials. In our study, we developed alginate–lecithin films enriched with green or roasted coffee bean extracts. The roasting process of coffee beans had a significant impact on the total phenolic content (TPC) in the studied extracts. The highest value of TPC (2697.2 mg GAE/dm3), as well as antioxidant activity (AA) (17.6 mM T/dm3), was observed for the extract of light-roasted coffee beans. Films with the addition of medium-roasted coffee extracts and baseline films had the highest tensile strength (21.21 ± 0.73 N). The addition of coffee extract improved the barrier properties of the films against UV light with a decrease in the transmittance values (200–400 nm), regardless of the type of extract added. Studies on Caco-2, HepG2 and BJ cells showed that digestated films were non-cytotoxic materials (100–0.1 μg/cm3) and had no negative effect on cell viability; an increase was noted for all cell lines, the highest after 48 h in a dose of 1 μg/cm3 for a film with medium-roasted coffee (194.43 ± 38.30) for Caco-2. The tested films at 20% digestate concentrations demonstrated the ability to reduce nitric oxide (NO) production in the RAW264.7 cell line by 25 to 60% compared to the control. Each of the tested films with coffee extracts had growth inhibitory properties towards selected species of bacteria.

Extraction and immobilization of the urease enzyme in polyvinylpyrrolidone films: applications in biosensors

Enzymes play a fundamental role in the manufacture of biosensors, acting as biological recognition elements due to their sensitivity and selectivity in the reactions they catalyze. Among them, urease stands out as an efficient enzyme found in nature, whose function involves the hydrolysis of urea. This enzyme has been used when extracted from legume seeds, as well as various bacteria and fungi. The objective of this study was the extraction and immobilization of the urease enzyme in polyvinylpyrrolidone (PVP) films. Crude jack bean extracts were prepared at concentrations of 15, 25 and 35% in PBS/PVP, centrifuged and refrigerated. Subsequently, aliquots of each solution were applied to plates to form films, being characterized by enzymatic activity, pH, FTIR and UV-vis. The affinity with urea was evidenced by enzymatic activity, pH and UV-vis, compatible with the Michaelis-Menten model. In FTIR, the polypeptide bands characteristic of the amino acids present in the structure of the enzymes, such as those of amides I, II and III, were confirmed.

Effectiveness of cocoa bean extract mouthwash against gingivitis in pregnant women in Aceh Besar

Background: Gingivitis and periodontitis are the most common dental support tissue problems in dentistry. Gingivitis is an inflammation of the gingiva due to the body's response to the accumulation of dental plaque bacteria in the form of Streptococcus mutans, Streptococcus sanguis, Actinomyces, and Spirochaeta on the surface of the teeth. Gingivitis and nutritional status in pregnant women are related to the risk of 8.75 times the birth of low-birth-weight babies (BBLR) and premature babies. Prevention of gingivitis can be done chemically through gargling with antibacterial mouthwash. Therefore, herbal ingredients are needed that can prevent plaque and control gingivitis. This study aims to determine the effectiveness of mouthwash of cocoa bean extract against gingivitis. Methods: This study used the post-test only control group design method. The study was conducted on pregnant women in Bayu Aceh Besar village with a total of 30 samples. The sample was divided into 3 groups that received different treatments. Group 1 was instructed to do a mouthwash with cocoa extract mouthwash while Group 2 with chlorhexidine, group 3 with mineral water. Each pregnant woman gargles for 30 seconds (20 ml) for 3 days. Results: Analysis of the gingival index before and after using cocoa seed extract mouthwash showed that this mouthwash was more effective in reducing the gingival index with a value of p=0.012 (p<0.05). Conclusions: Gargling with cocoa bean extract is more effective in reducing gingivitis. We recommend further studies to investigate the potential of cocoa bean extract for use in mouthwashes.

Unveiling the potential of germinated black bean extracts: Targeting topoisomerase IIα through in silico and in vitro approaches

This study investigates the potential of germinated black bean extracts (GBBE) to modulate the activity of topoisomerase IIα (topo IIα), a key enzyme involved in DNA replication and repair, particularly in triple-negative breast cancer (TNBC). Germination significantly elevated the polyphenolic content of black beans, thereby enhancing their antioxidant properties. Molecular docking studies demonstrated a strong interaction between GBBE and the active site of topo IIα, suggesting a possible mechanism for its inhibitory action. In vitro experiments revealed a significant inhibitory effect of GBBE on topo IIα ATPase activity, which was further confirmed by the decatenation assay, with bean extracts germinated for three days showing the highest effect. The study underscores the significance of GBBE as a promising natural source of bioactive compounds with the capacity to inhibit topo IIα activity, offering a potential novel therapeutic strategy against TNBC. Warranting further investigation to clarify the molecular mechanisms underlying these effects.

Sequential Detection of Hg2+ and TNT Using a Nitrogen‐Doped Polymeric Carbon Dots On–Off–On Fluorescence Sensor

ABSTRACTThis work presents a fluorescence sensor based on nitrogen‐doped carbon dots (N‐CDs) utilized for sequential detection of Hg2+ and TNT. The N‐CDs were produced by a simple and efficient hydrothermal process involving the combination of black bean extract with citric acid (CA) and ethylenediamine (EDA). The resulting N‐CDs exhibit a steady blue fluorescence with a significant quantum yield of 12%. We conducted a thorough investigation into the mechanism by which the fluorescence of NCDs is reduced in the presence of Hg2+. Our analyses, which included Stern–Volmer quenching tests, confirmed the development of a stable complex between N‐CDs and Hg2+. When the NCDs‐Hg2+ complex was exposed to TNT, the fluorescence was selectively restored. This sequential “on–off–on” sensing capacity allows for efficient monitoring of both Hg2+ and TNT, demonstrating good sensitivity and selectivity. The sensor has a low detection limit (LOD) of 3.1 and 46 nM for Hg2+ ions and TNT in a linear range of 0–40 and 0–30 μM, respectively. This study emphasizes the potential application of N‐CDs for detecting heavy metals and explosives at the same time. It highlights their usefulness in sophisticated environmental sensing technologies that are suitable for important applications.

Co-Encapsulation of Coffee and Coffee By-Product Extracts with Probiotic Kluyveromyces lactis.

Coffee and coffee by-products contain several chemical compounds of great relevance, such as chlorogenic acid (CGA), trigonelline, and caffeine. Furthermore, yeasts have been the target of studies for their use as probiotics because of their interesting biochemical characteristics. The combined administration of probiotic microorganisms with components that provide health benefits mediated by alginate encapsulation is an alternative that ensures the stability of cells and chemical compounds. In this context, the aim of this work was to co-encapsulate the probiotic yeast Kluyveromyces lactis B10 and extracts of green coffee beans, coffee silverskin, and PVA (black, green or immature, and sour coffee beans). The bioactive composition, antioxidant and antimicrobial activities of the extracts, microcapsule morphological characteristics and encapsulation efficiency, ability of the encapsulation to protect the yeast cells subjected to gastrointestinal conditions, and antioxidant activity of the microcapsules were evaluated. All the evaluated extracts showed antioxidant activity, of which PVA showed 75.7% and 77.0%, green coffee bean showed 66.4% and 45.7%, and coffee silverskin showed 67.7% and 37.4% inhibition of DPPH and ABTS•+ radicals, respectively, and antimicrobial activity against the pathogenic bacteria E. coli, Salmonella, and S. aureus, with high activity for the PVA extract. The microcapsules presented diameters of between 1451.46 and 1581.12 μm. The encapsulation efficiencies referring to the yeast retention in the microcapsules were 98.05%, 96.51%, and 96.32% for green coffee bean, coffee silverskin, and PVA, respectively. Scanning electron microscopy (SEM) showed that the microcapsules of the three extracts presented small deformations and irregularities on the surface. The K. lactis cells encapsulated in all treatments with the extracts showed viability higher than 8.59 log CFU/mL, as recommended for probiotic food products. The addition of green coffee bean, coffee silverskin, and PVA extracts did not reduce the encapsulation efficiency of the alginate microcapsules, enabling a safe interaction between the extracts and the K. lactis cells.

Potential Antihyperglycemic Effects of Adzuki (Vigna angularis) Polyphenols on Mice and Caco-2 Cells

Background/Purpose Some health-beneficial foods, including adzuki beans ( Vigna angularis), can show antihyperglycemic effects. Adzuki bean-derived polyphenols, such as (+)-catechin 7- O- β-d-glucopyranoside (C7G) and (+)-epicatechin 7- O- β-d-glucopyranoside (E7G), could be potential inhibitors of α-amylase and α-glucosidase, however, few studies of the activity of adzuki polyphenols have been performed in vivo. Thus, we evaluated the antihyperglycemic effects of crude adzuki bean extract containing polyphenols (ABP), and purified C7G or E7G using mice and Caco-2 cells. Methods Six-week-old male ICR mice were orally administered ABP (100 or 250 mg/kg), C7G or E7G (15 or 40 mg/kg), and sucrose (2 g/kg). Blood samples were taken from the lateral tail vein to measure the blood glucose levels at various times over 0–120 min. Cultured caco-2 cells, an intestinal model, were treated with ABP, C7G, or E7G. The glucose concentration in the medium was measured to examine the activity of α-glucosidase. Results Administration of adzuki polyphenols decreased blood glucose levels, especially E7G administration significantly showed antihyperglycemic effects in vivo. In Caco-2 cells, α-glucosidase activity was significantly decreased by ABP, C7G, or E7G addition in a dose-dependent manner without cytotoxicity. Conclusion These results suggest that C7G and E7G in adzuki bean extract inhibited sucrose-degrading enzymes to elicit antihyperglycemic effects in vivo, which supports the results of previous studies using adzuki beans, and may contribute to health promotion.

Effect of ultrasound assisted extraction and simulated in vitro gastrointestinal digestion on phenolic compound profile, bio-accessibility, and LC-ESI-QTOF-MS analysis of black beans (Phaseolus vulgaris L.) extract

Effect of ultrasound assisted extraction and simulated in vitro gastrointestinal digestion on phenolic compound profile, bio-accessibility, and LC-ESI-QTOF-MS analysis of black beans (Phaseolus vulgaris L.) extract

Immunoexpression of aortic endothelial P-selectin and serum apolipoprotein A-1 levels after administration of arabica (Coffea arabica) and robusta (Coffea canephora) coffee bean extracts: In vivo study in atherosclerosis rat model.

Atherosclerosis is a leading cause of cardiovascular disease-related death worldwide. Some studies suggested that the natural ingredients in coffee may negatively affect cardiovascular diseases, while other studies indicated that coffee contains anti-inflammatory compounds that are beneficial for cardiovascular diseases. The aim of this study was to measure the expression of P-selectin in aortic endothelial cells and the level of serum apolipoprotein A-1 (ApoA-1) in an atherosclerosis rat model after the administration of arabica and robusta coffee bean extracts at mild-moderate and high doses. An experimental study was conducted with a complete randomized design using 36 adult male white rats (Rattus norvegicus) divided into six groups: negative control (NC), positive control (PC), arabica mild-moderate dose (A1), arabica high dose (A2), robusta mild-moderate dose (R1), and robusta high dose (R2). Animals were induced atherosclerosis with atherogenic feed and then were treated with arabica and robusta coffee bean extracts at two different doses for four weeks. The results showed that the expression of P-selectin in the group of rats treated with robusta coffee bean extract was lower than arabica coffee bean extract group. Rats with robusta coffee bean extract mild-moderate dose had the highest ApoA-1 levels compared to other groups significantly (p<0.05). The level of ApoA-1 was higher in both mild-moderate and high dose of robusta coffee groups compared to the negative control group (both with p<0.001). In conclusion, mild-moderate intake of robusta coffee bean extract could reduce aortic P-selectin immunoexpression and increase serum ApoA-1 levels in an atherosclerosis rat model.

From beverage to anticancer agent: The repurposing of green coffee bean extract loaded in solid lipid nanoparticles

Green coffee bean extract (GCBE) captivated the world with its various health benefits. However, its topical use was limited by the hampered penetration of hydrophilic GCBE through the skin. So, this study aimed to incorporate GCBE-loaded solid lipid nanoparticles (SLNs) into water-in-oil (W/O) cream, to explore its repurposed application as an anticancer drug. The anticancer activity was assessed in vitro using MTT assay against human breast cancer cell lines (MCF-7) and in vivo using the Ehrlich ascites carcinoma (EAC) model in mice compared to free GCBE followed by immunohistochemical analysis of caspase-3 and estrogen receptor. The optimized GCBE-SLNs results of the MTT assay exhibited a concentration-dependent reduction in the viability of MCF-7 with approximately 36 times more toxic effect against MCF-7 compared to free GCBE. The results of the in vivo Ehrlich ascites carcinoma model revealed that GCBE-SLNs cream exhibited statistically significant higher expression of caspase-3, lower expression of estrogen receptor, and increased necrotic index compared to the control group. Conclusively, GCBE-SLNs cream seems to have reassuring promises as anticancer remediation in both in vivo and in vitro studies. The present work is considered the first pre-clinical evidence for the potential merits of GCBE-SLNs in cancer management.

Administration of arabica coffee green bean extract (Coffea arabica L.) reduces tumor necrosis factor-α levels and increases superoxide dismutase levels in excessive physical exercise male Wistar rats (Rattus norvegicus)

Background: Green Arabica coffee bean water extract contains phenolic acid, polyphenols, caffeine, and chlorogenic acid, which are responsible for health benefits including antioxidant and anti-inflammatory properties. Excessive exercise induces oxidative stress. Tumor necrosis factor-α (TNF-α) and the superoxide dismutase (SOD) may be modified by routine administration of green Arabica coffee bean water extract at the appropriate concentration. Thus, the study aimed to determine the effect of green Arabica coffee bean water extract on TNF-α and SOD levels after excessive physical exercise treatment in a male Wistar rat.Methods: This research used a posttest-only control group design method. Subjects were Wistar rats (Rattus norvegicus), male, 2-3 months old, weighing 150-200 grams. The P0 group was not given treatment. Groups P1, P2, P3, and P4 were given excessive physical exercise. Group P1 was given distilled water. Groups P2, P3, and P4 were given Arabica coffee bean extract at 200, 400, and 800 mg/kg, respectively. Phytochemical was determined by thin layer chromatography (TLC) spectrophotometry method for caffeine, but phenolic acid and polyphenol were standardized to gallic acid (GA). Antioxidant activity was tested using the DPPH method. TNF-α and SOD levels were determined by ELISA methods. Differences among groups were tested with one-way ANOVA and least significant difference (LSD) post hoc test at p &lt; 0.001.Results: One-way ANOVA test showed differences in TNF-α levels (F = 6,388.964; p &lt; 0.001). The LSD post hoc test showed that TNF-α levels in the P1 (159.640 ± 0.167) were higher compared to the P0 (151.720 ± 0.303) (p &lt; 0.001). The levels of TNF-α in P2 (139.680 ± 0.303) were lower than in P1 (p &lt; 0.001). However, TNF-α levels in P3 (161.680 ± 0.084) and P4 (163.750 ± 0.412) were higher than in P1. One-way ANOVA test showed that there were differences in SOD levels (F = 5,564.526; p = 0.003). The LSD post hoc test showed that SOD levels in the P1 (0.742 ± 0.009) were lower than those in the P0 (1.448 ± 0.022) (p &lt; 0.001). The levels of SOD in P2 (1.668 ± 0.026) were higher than in P1 (p &lt; 0.001). However, SOD levels in P3 (0.680 ± 0.003) and P4 (0.591 ± 0.010) were lower than in P1.Conclusion: Administration of Arabica coffee green bean extract prevents an increase in TNF-α levels and decreases SOD levels in excessive physical exercise male Wistar rats.

Antispasmodic Activity of Light-Roasted Coffee Extract and Its Potential Use in Gastrointestinal Motility Disorders.

Antispasmodic agents are crucial in managing gastrointestinal motility disorders by modulating muscle contractions and reducing symptoms like cramping and diarrhea. This study investigated the antispasmodic potential of different coffee bean extracts, including light coffee (LC), medium coffee (MC), and dark coffee (DC), on ileum contractions induced by potassium chloride (KCl), and elucidated their mechanisms of action using in vitro isolated tissue techniques. The results demonstrated that all coffee extracts reduced spontaneous contractions of rat ileum tissue in a dose-dependent manner. Among these, LC showed the most significant reduction in ileum contractions, particularly at higher concentrations. The key findings reveal that LC at 5 mg/mL significantly reduced CaCl2-induced contractions in isolated rat ileum tissue, indicating that LC may inhibit calcium influx or interfere with calcium signaling pathways. The presence of nifedipine, propranolol, and N-nitro-L-arginine methyl ester (L-NAME) have been confirmed in their involvement; they block calcium influx and calcium channels and activate β-adrenergic pathways as part of LC's mechanism of action. The presence of their active compounds, particularly chlorogenic acid and caffeine, likely contributes to the observed antispasmodic effects. These findings suggest that LC exerts its antispasmodic effects by targeting key mechanisms involved in muscle spasms and intestinal motility, providing a potential for managing such conditions.

Adsorption and desorption process for high recovery and purification of anthocyanins from (Clitoria ternatea L) using macroporous resins

The intense coloration of the petals of the butterfly bean flowers (Clitoria Ternatea L.) is attributed to high content of anthocyanins, which are considered as an antioxidant phytochemicals that have many health benefits. In this context, it is so important to implement a new method for the separation and purification of phenolic compounds. Therefore, the objective of this work was to evaluate the adsorption and desorption behavior of anthocyanins extracted from the petals of the butterfly bean flowers, using six different macroporous adsorption resins (XAD 2, XAD 4, XAD 7HP, DAX 8. XAD 1180 N and XAD 16), and to identify the best type of resin for anthocyains recovery from butterfly bean flowers extract. The XAD7HP and DAX8 resins showed high adsorption capacity, (248.55 ± 8.8 mg/g) and (228.84 ± 16.9 mg/g) at pH 5, and the highest recovery values for anthocyanins; (75.66 ± 1.1%) and (52.64 ± 1.2%), respectively. The Langmuir model described better the adsorption isotherm process on DAX 8, in turn, the experimental data of equilibrium were better fitted by Freundlich model for isotherm adsorption of anthocyanin on XAD7HP resin. The pseudo-second order model was the best to fit the experimental data of the adsorption kinetics at the different temperatures used. Both resins XAD 7HP and DAX 8 presented high recovery of anthocyanin, comparing with conventional extracted methods the purified anthocyanin using XAD 7HP and DAX 8 can be used as biological compounds with more purity for food and pharmaceutical applications.

Common bean polyphenolic enriched extracts decrease reactive oxygen species induced by heavy metals and polycyclic aromatic hydrocarbons in Hs27 and Hs68 human fibroblasts

The increase of coarse particulate matter (PM10) due to industrialization and urban sprawl has been identified as a significant contributor to air pollution and a threat to human skin health and premature aging. The objective was to analyze the antioxidant effect of phenolic-enriched extracts (PHE) obtained from black bean (BB) and pinto bean (PB) varieties (Phaseolus vulgaris L.) and pure phenolic compounds (rutin, catechin, and gallic acid) in two human dermal fibroblasts cell lines exposed to PM10. Petunidin-3-O-glucoside was the most abundant anthocyanin, with 57 ± 0.9 mg/g dry extract (DE) in PHE-BB. Gallic acid was the prevalent phenolic acid with 8.2 ± 2.8 mg/g DE in PHE-BB (p < 0.05). Hs27 and Hs68 cell lines were exposed to PM10 (100 μg/mL) to induce oxidative stress; PHE-BB reduced it by 69% ± 12 and PHE-PB by 80% ± 5 relative to PM10 treatment (p < 0.05). Delphinidin-3-O-glucoside showed the highest binding affinity in adenosine monophosphate-activated protein kinase (AMPK) with −9.0 kcal/mol and quercetin-3-D-galactoside with −6.9 kcal/mol in sirtuin 1 (Sirt1). Rutin increased the expression of Sirt1 by 30% (p < 0.05) in the Hs27 cell line treated with PM10. Common bean extracts can potentially reduce oxidative stress induced by PM10 in human dermal fibroblasts.

Influence Green Bean Extract in Increasing Hemoglobin (Hb) Levels in Trimester II Pregnant Motherat Pratama Clinic of bunda Tessa Dusun 1A Sidourip Sub-District Beringin Deli Serdang Regency in 2023

Introduction: Pregnant women with anemia are still many in Indonesia, including in North Sumatra which reached 39%. Pregnancy is very susceptible to anemia that can cause bleeding in pregnant women. Purpose: The purpose of this study was find out the influence Green Bean extract in increasing Hemoglobin Levels in Trimester II Pregnant Women in Pratama Clinic of Bunda Tessa Dusun IA Sidourip Subdistrict Beringin District Deli Serdang in 2023. Method: Types of Quasy Experiment with the design of One Group Pretest Posttest. The population was 20 people. Sampling technique with purposive sampling was a selection of samples based on certain characteristics as many as 10 people, the statistic test used wilcoxon test. Result: Based on the result showed that the data obtained was pre-test minimum value of 8.4 maximum 11.9 while post-test minimum 10.8 maximum13.7. From the results of statistical tests thatwas with wilcoxon test known value P-value= .11 &lt;. 05. Conclusion: The ability in this study is the effect of green bean extract on increasinghemoglobin levels in trimester II pregnant women in Pratama Clinic of Bunda Tessa Dusun IA Sidourip Subdistrict Beringin District Deli Serdang in 2023. It is suggested to be an evaluation and reference material for health workers to be applied and can inform pregnant women who have anemia in a natural way that is by consuming green bean juice as much as 200 ml.

Proprietary alpha-amylase inhibitor formulation from white kidney bean (Phaseolus vulgaris L.) promotes weight and fat loss: a 12-week, double-blind, placebo-controlled, randomized trial

White kidney bean (Phaseolus vulgaris L.) extracts can aid weight management by reducing calorie intake from complex carbohydrates through alpha-amylase inhibition. We examined the impact of a proprietary aqueous extract from whole dried white kidney beans standardized by its alpha-amylase inhibitor activity (Phase 2 white kidney bean extract (WKBE)) on weight management in subjects with overweight and moderate obesity. In a randomized, double-blind, placebo-controlled fashion, 81 participants completed the study and ingested either a high dose of Phase 2 (1000 mg, WKBE HIGH), a low dose (700 mg, WKBE LOW), or a matching placebo (microcrystalline cellulose, PLA) three times a day, 30 min before meals, for 12 weeks during a calorie restricted diet. In a dose-dependent manner, Phase 2 significantly reduced body weight, fat mass, BMI, waist, hip and in the WKBE HIGH group thigh circumference. Phase 2 is an effective and safe supplement aiding weight and fat loss. ClinicalTrials.gov identifier NCT02930668.

PENGARUH KOMPOSISI MEDIA TANAM DAN KONSENTRASI EKSTRAK TAUGE TERHADAP PERTUMBUHAN AWAL STEK BIBIT VANILI (Vanila planifolia Andrews)

Vanilla is one of the export commodities with a relatively high economic value. One of the problems with vanilla cultivation is the health of vanilla seedlings. This study aimed to determine the best concentration of growth regulators from bean sprout extract to vanilla seed cuttings with some variations of plant media. This research was conducted by observing changes in shoot length, root length, number of leaves, and root volume in plant samples due to providing various types of planting media treatments and PGR fertilization. This study was designed using the Completely Randomized Design method with two factors. The treatment composition of growing media with bean sprout extract concentration showed a significant effect on the growth parameters, which affected the observation parameters, including the number of leaves, shoot length, root length, and root volume. The best bean sprout extract concentration was 10%, and the best-growing media composition was soil and manure.

Alterations in pH of Coffee Bean Extract and Properties of Chlorogenic Acid Based on the Roasting Degree.

Factors influencing the sour taste of coffee and the properties of chlorogenic acid are not yet fully understood. This study aimed to evaluate the impact of roasting degree on pH-associated changes in coffee bean extract and the thermal stability of chlorogenic acid. Coffee bean extract pH decreased up to a chromaticity value of 75 but increased with higher chromaticity values. Ultraviolet-visible spectrophotometry and structural analysis attributed this effect to chlorogenic and caffeic acids. Moreover, liquid chromatography-mass spectrometry analysis identified four chlorogenic acid types in green coffee bean extract. Chlorogenic acid isomers were eluted broadly on HPLC, and a chlorogenic acid fraction graph with two peaks, fractions 5 and 9, was obtained. Among the various fractions, the isomer in fraction 5 had significantly lower thermal stability, indicating that thermal stability differs between chlorogenic acid isomers.

Changes in biochemical composition of Ethiopian Coffee arabica with growing region and traditional roasting.

Updating the biochemical composition of coffee beans across the years is necessary. This is important to understand the vulnerability of coffee toward climate adaptation longitudinally. Accordingly, in this study the influence of growing area and traditional roasting on the biochemical composition of five common Ethiopian Arabica coffee beans collected in the harvest year of 2021/22 were investigated. With an average of 11.34 g/100 g, the Hararge and Jimma coffee beans had the highest crude fat content (p < 0.05). The crude protein content of the five varieties was in the range of 13-15 g/100 g, with respective highest and lowest contents in the (Hararge and Nekemte) and (Sidama and Yirgachefe) coffee beans (p < 0.05). The total phenolic content (TPC) of the coffee beans was in the order of Jimma (46.52) > Nekemte (44.55) > Sidama (44.31) > Hararge (39.02) > Yirgachefe (34.25) mg GAE/100 g. The 50% inhibitory concentration (IC50) of ascorbic acid, coffee bean extract from Jimma and Hararge against 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical was 19.86, 20.22 and 20.02 μg/mL, respectively. The respective highest and lowest caffeine concentration was obtained in the Yirgachefe (10.38) and Hararge (7.55 g/100 g) coffee beans (p < 0.05). The Jimma, Sidama, and Nekemte coffee varieties had the highest chlorogenic acid content of 45 g/100 g (p > 0.05); whereas the lowest content was in Hararge coffee (36.78 g/100 g). While the caffeine concentration did not show significant (p > 0.05) difference, with all the coffee beans the roasting has reduced significantly the TPC, trigonelline and mainly the chlorogenic acid (p < 0.05). These data can update the existing facts on biochemical diversity of coffee beans in the country which can be used for evidence based innovations of climate adaptation in predicting the quality of coffee. Further recommendation of optimizing the traditional coffee processing method is supported from this study.

Assessment of the Diuretic Properties of Rice Bean Accessions Using a Mouse Model and Identification of Active Polyphenolic Compounds.

Rice bean [Vigna umbellata (Thunb.) Ohwi and Ohashi], an annual legume in the genus Vigna, is a promising crop suitable for cultivation in a changing climate to ensure food security. It is also a medicinal plant widely used in traditional Chinese medicine; however, little is known about the medicinal compounds in rice bean. In this study, we assessed the diuretic effect of rice bean extracts on mice as well as its relationship with the contents of eight secondary metabolites in seeds. Mice gavaged with rice bean extracts from yellow and black seeds had higher urinary output (5.44-5.47 g) and water intake (5.8-6.3 g) values than mice gavaged with rice bean extracts from red seeds. Correlation analyses revealed significant negative correlations between urine output and gallic acid (R = -0.70) and genistein (R = -0.75) concentrations, suggesting that these two polyphenols negatively regulate diuresis. There were no obvious relationships between mice diuresis-related indices (urine output, water intake, and weight loss) and rutin or catechin contents, although the concentrations of both of these polyphenols in rice bean seeds were higher than the concentrations of the other six secondary metabolites. Our study findings may be useful for future research on the diuretic effects of rice bean, but they should be confirmed on the basis of systematic medical trials.