Pelargonidin-3-glucoside Research Articles

Anthocyanin content, bioactive compounds and physico-chemical characteristics of potential new strawberry cultivars rich in-anthocyanins

BACKGROUND: High anthocyanin content and the presence of other bioactive compounds are attractive characteristics of strawberry fruits for healthy consumption. OBJECTIVES: To characterize the anthocyanin content and the presence of other bioactive compounds, including anthocyanin (total and predominant types) andantioxidant activity; and to determine the physico-chemical fruit quality parameters of two new strawberry cultivars. METHOD: Fruits of two new hybrids were extracted and total anthocyanin and antioxidant activity were determined usinga UV-Vis spectrophotometer. Individual anthocyanins and vitamin C were measured using an HPLC. Physico-chemical characteristics of fruits were analyzed. RESULTS: Hybrid No. 4 line 5 and hybrid No. 4 line 26 are two potential new strawberry cultivars that are rich in anthocyanins. The total anthocyanin contents of these two hybrids were approximately 31–38 mg/100 g FW with no significant differences between them. Cyanidin 3-glucoside and pelargonidin 3-glucoside were foundat amounts of approximately 15–24 mg/kgFW and 332–478 mg/kg FW, respectively. Total phenolic compounds and FRAP activity of the two hybrids were approximately 2295–2579 mg GAE/kgFWand 27–30 mmol Fe2 +/kg FW, respectively. CONCLUSION: The two new hybrid strawberry lines, hybrid No. 4 line 5 and No. 4 line 26, when compared to the parents, had higher levels of bioactive compounds, especially anthocyanins, total phenolics, and FRAP, together with improved physico-chemical quality, and higher vitamin C content. These results indicate a considerable potential of these hybrids for commercial cultivation in Thailand and other production regions.

Comparison of anthocyanin distribution in berries of Haskap (Lonicera caerulea subsp. edulis (Turcz. ex. Herder) Hultén), Miyama-uguisukagura (Lonicera gracilipes Miq.), and their interspecific hybrid using imaging mass spectrometry

Haskap (Lonicera caerulea subsp. edulis), a shrub with violet–blue fruits, is distributed mainly in Hokkaido, Japan. Miyama-uguisukagura (Lonicera gracilipes), a species related to Haskap, produces red fruits. Interspecific hybridization of Miyama-uguisukagura and Haskap was performed to introduce novel characteristics in the resulting hybrids. The shape and color of the interspecific hybrid fruits differed from those of the parent fruits. A comparison of anthocyanin distribution among these three fruit types by imaging mass spectrometry (IMS) revealed the presence of five different anthocyanins. The average cyanidin 3,5-diglucoside and peonidin 3,5-diglucoside intensities in the interspecific hybrid fruit were higher than those of the parent fruits, whereas the average pelargonidin 3-glucoside, cyanidin 3-glucoside, and peonidin 3-glucoside intensities were the highest in Haskap. All anthocyanins were mainly accumulated in the inner and outer skins of Haskap and interspecific hybrid fruits, and in the skin of Miyama-uguisukagura fruits. The order of signal intensities of all anthocyanins among the three fruits was unchanged in different regions. Additionally, a comparison of IMS and LC/MS data from our previous study confirmed the possibility of comparing multiple fruits in the same plate by IMS. Thus, we elucidated anthocyanin distribution patterns of the interspecific hybrid and parent fruits by IMS.

Improving the physicochemical stability and functionality of nanoliposome using green polymer for the delivery of pelargonidin-3-O-glucoside

This study aimed to improve the physicochemical stability of nanoliposome (NL) with enhanced functionality for the delivery of Pelargonidin-3-O-glucoside (P3G) using biopolymers, i.e. chitosan (CH) and pectin (P). In this study, we successfully developed stabilized liposomal carriers, i.e. CH-conjugated NL (CH-NL) and P-conjugated CH-NL (P-CH-NL) using an optimum concentration of CH (0.6 wt%) and P (0.5 wt%). Results revealed that P-CH-NL had better physical stability to salt and pH with maximum P3G retention (>97%) under oxidative, thermal, and UV conditions. Nanoliposomes were more stable under refrigerated-storage and ensured high P3G retention (>96%). In vitro mucoadhesion study revealed that CH-NL had better mucin adsorption efficiency (59.72%) followed by P-CH-NL and NL. Furthermore, CH-NL and P-CH-NL alternatively had better stability to serum than NL. Taken together, the stabilization of nanoliposome using chitosan and pectin can be a promising approach for the delivery of hydrophilic compounds in association with enhanced stability and functionality.

Pomegranate-derived anthocyanin regulates MORs-cAMP/CREB-BDNF pathways in opioid-dependent models and improves cognitive impairments

BackgroundPomegranate (Punica granatum) is one of the oldest known edible fruit. Recently, there has been an increased interest in this fruit as a functional food for health benefits due to its use in disease prevention and promotion of overall health wellness. ObjectiveThis study aims to investigate the effects of pomegranate extract for the development of non-opioid substitution therapy for in-vitro and in-vivo studies. Materials and methodsAnthocyanin contents consisting of cyanidin 3-glucoside, diglucoside, and pelargonidin 3-glucoside, diglucoside were detected and quantified in pomegranate extract using high-performance liquid chromatography. The optimum dosage of the extract was determined based on the regulation of MORs and cAMP proteins in U-87 cells. Co-treatment of the extract with morphine was performed to evaluate its potency in reducing the concentration levels of MORs and cAMP. For animal studies, rats were divided into two major groups representing both acute and chronic morphine-induced treatments and the Morris water maze (MWM) study was employed after treatment for each rat. The rats were sacrificed after the treatments and serum samples were collected to evaluate the levels of CREB and BDNF. ResultsThe results indicated that each of the anthocyanin content tested in the study was present in the pomegranate extract. Additionally, in-vitro studies using pomegranate extract treatment showed that the extract was effective in decreasing the MORs and cAMP protein levels in U-87 cells at a concentration of 0.125 mg/mL. The memory impairment based on the MWM study in rats was also subsequently improved after treatment with pomegranate extract as compared to treatment with morphine. The blood serum derived from the rats treated with pomegranate extract also showed a significant decrease in CREB level and an increase in BDNF as compared to rats treated with morphine. ConclusionIn conclusion, this study substantiates the potency of pomegranate extract as a non-opioid substitution therapy for in-vitro and in-vivo studies.

Colonic delivery of pelargonidin-3-O-glucoside using pectin-chitosan-nanoliposome: Transport mechanism and bioactivity retention

Colon-targeted delivery is an active area of research as it can improve drug stability, bioactivity, and lessen the systematic toxicity. In this study, the colon-specific delivery of pelargonidin-3-O-glucoside (P3G) was investigated using pectin (P)/chitosan (CH)-functionalized nanoliposome (NL). The food simulant stability, transport mechanism, and bioactivity retention potential of carrier systems were studied. Results showed that polymer-coated nanoliposomes (P-CH-NL and CH-NL) improved the thermal and food simulant stability as well as enhanced the P3G retention during the in vitro digestion. The maximum P3G retention after enzymatic and non-enzymatic digestion was observed by P-CH-NL and the values were 47.5% and 57.5%, respectively. However, all nanoliposomal carriers followed Fickian diffusion mechanism both in in vitro food simulants and in vitro digestion models. Digested functionalized nanoliposomes revealed higher antioxidant properties after gastric digestion. Following by simulated intestinal fluid digestion, ABTS antioxidant activity of P-CH-P3G-NL was 12.52% and 6.31% higher than that of P3G-NL and CH-P3G-NL, respectively, while DPPH scavenging capacity of P-CH-P3G-NL was 5.57% and 1.86% greater than that of P3G-NL and CH-P3G-NL, respectively. Therefore, the developed functionalized nanoliposome can be useful for colon-targeted delivery and applicable in functional foods and/or beverages.

PH-Controlled fermentation of strawberry waste as phenol solubilisation method

The present study aims to use pH as a control parameter for the accumulation of target compounds. Solubilisation of wasted strawberry through fermentation at different operational pH (pH 4, 7, and 9) was evaluated. Methane as a target compound was achieved at pH 7, reaching a value up to 353 ± 10 mL CH4/g VS (VS, volatile solids). Operation at pH 9 was hardly controlled due to the low pH of the substrate and the accumulation of VFA. pH 9 resulted in the highest accumulation of VFA, mainly acetic acid. The operation at pH 4 resulted in the inhibition of the biogas production, leading to the concentration of soluble phenols up to 3 times the initial concentration in the reactors. The concentrations of pelargonidin 3-glucoside and p-coumaric acid showed a significant increase at pH 4 (p = 0.157 and p = 0.058, respectively). Acidogenic fermentation could be a suitable method to solubilise bioactive compounds from wasted strawberries without the necessity of high-energy pre-treatments. The low energy demand, i.e. 19 equivalent kJ/g gallic acid, as well as the high phenol solubilisation capacity, indicates that the acidogenic fermentation at pH 4 it is a promising method for the recovery of phenols from wasted strawberry.

Potential for antioxidant and antihyperglycemic activities of four everbearing strawberry cultivars

‘Goha’, ‘Gangha’, ‘Gwanha’, and ‘Yeolha’ are newly-developed Korean everbearing strawberry (Fragaria ananassa Duch.) cultivars. Bioactive phytochemicals play a crucial role in the prevention of cancer, cardiovascular, neurodegenerative, and metabolic diseases. We examined the free radical scavenging activity and α-glucosidase inhibitory activity in these four cultivars and a junebearing cultivar ‘Seolhyang’ for comparison. ‘Gwanha’ showed the strongest 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) free radical scavenging activities, and ‘Gwanha’ and ‘Goha’ had the most potent α-glucosidase inhibitory activity. Total anthocyanin content (TAC) was the highest in ‘Gwanha’. The major anthocyanin components of everbearing strawberry were determined to be pelargonidin-3-O-glucoside (Pg3G), pelargonidin-3-O-rutinoside, and cyanidin-3-O-glucoside (C3G). A correlation study between activity and components revealed that TAC was highly correlated with antioxidant and antihyperglycemic activities, and in principal component analysis, C3G is highly correlated with antioxidant activity and Pg3G is highly correlated with the antihyperglycemic effect of everbearing strawberries. Among the four everbearing strawberry cultivars, ‘Gwanha’ and ‘Goha’ are rich sources of pelargonidin showing strong α-glucosidase inhibitory activity and are promising dietary sources to prevent diabetes.

Pelargonidin 3-glucoside-enriched strawberry attenuates symptoms of DSS-induced inflammatory bowel disease and diet-induced metabolic syndrome in rats.

To determine whether the anthocyanin, pelargonidin 3-glucoside (P3G), attenuates symptoms of inflammatory bowel disease (IBD) and metabolic syndrome in rats. We tested P3G-enriched strawberry in two models of chronic inflammation in rats, chronic IBD induced by 0.5% dextran sodium sulphate in the drinking water for 12weeks (D) and metabolic syndrome induced by a high-carbohydrate, high-fat diet (H) for 16weeks. P3G-enriched strawberry was added to the diet for the final 6weeks in IBD rats (DP) or 8weeks in H rats (HP) to provide a dose of 8mg P3G/kg/day. D rats had marked diarrhoea, bloody stools, erosion of mucosal epithelium, crypt atrophy, loss of villi and goblet cells, and inflammatory cell infiltration. These symptoms were reversed by P3G with healthy stools and mucosal lining of ileum and colon including increased villi, crypts and goblet cells and reduced inflammation. H rats developed hypertension, dyslipidaemia, central obesity, increased ventricular stiffness, cardiac and liver inflammation, and steatosis. P3G treatment in H rats improved systolic blood pressure, ventricular stiffness, and cardiac and liver structure, and reduced abdominal fat, abdominal circumference and body weight gain. Our study indicates that dietary P3G decreased inflammation to decrease the symptoms of IBD, and to improve cardiovascular, liver and metabolic functions in metabolic syndrome.

Transcriptome profiling reveals the antihyperglycemic mechanism of pelargonidin-3-O-glucoside extracted from wild raspberry

Abstract Emerging evidence suggests that anthocyanins prevent type 2 diabetes (T2D), however, its mechanisms remain elusive. Herein, we sought to elucidate the antihyperglycemic mechanism of pelargonidin-3-O-glucoside (Pg3G) extracted from wild raspberry based on RNA-sequence. Our study showed that Pg3G ameliorated glucose intolerance and insulin resistance in db/db mice. Besides, Pg3G improved serum lipid profiles and attenuated hepatic dysfunction. RNA-sequence analysis showed that Pg3G contributed to 301 genes upregulated and 269 genes downregulated. Further GO, KEGG and GSEA analysis indicated that Pg3G led to differential gene expressions enriched in glucose and lipid metabolism by upregulation of Elovl7, C1ql3, Cybb, Cytip, Src, Pdk4 and downregulation of Fasn, Aacs, Srebp1c, Mlxipl, Sorbs3, Gck, Slc2a4. RT-PCR validation of selected genes exhibited a positive correlation between RNA-sequence and RT-PCR results. Taken together, this study demonstrated that Pg3G attenuated T2D by regulating glucose and lipid metabolism, which implicates the potential for T2D therapeutics.

Organoleptic Evaluation of Product Developed from Pomegranate Flower for Liver Disease

Pomegranate biologically known as Punica Granatum L. It is grown throughout dry Mediterranean regions like hot, dry summers. It is a small shrub in which flowering occurs on 1-year-old spurs or short branches appearing as solitary, pairs, or clusters. It shows the antioxidative property, anti-inflammatory property and hepatoprotective property due to the presence of two anthocyanins- pelargonidin 3, 5-diglucoside and pelargonidin 3-glucoside in its purified form. The study was conducted to develop a value-added product from dry pomegranate flower powder for liver disease patients. It involves procurement of flowers from Delhi, NCR and dried at room temperature to convert them into dry powder. The product, shrikhand was developed in different concentrations, i.e., 12.5 g, 18 g, 25 g of pomegranate flower powder. Sensory evaluation was done using a composite scale and the data was statistically analyzed by using Statistical package for Social Sciences (SPSS) version 21. It revealed that the product with a concentration of 12.5 g of pomegranate powder was highly acceptable in all parameters -color, taste, texture, aroma, an appearance by composite scale. The shelf life of the product developed with 12.5g of pomegranate flower powder was done.

Hybrid-Transcriptome Sequencing and Associated Metabolite Analysis Reveal Putative Genes Involved in Flower Color Difference in Rose Mutants.

Gene mutation is a common phenomenon in nature that often leads to phenotype differences, such as the variations in flower color that frequently occur in roses. With the aim of revealing the genomic information and inner mechanisms, the differences in the levels of both transcription and secondary metabolism between a pair of natural rose mutants were investigated by using hybrid RNA-sequencing and metabolite analysis. Metabolite analysis showed that glycosylated derivatives of pelargonidin, e.g., pelargonidin 3,5 diglucoside and pelargonidin 3-glucoside, which were not detected in white flowers (Rosa ‘Whilte Mrago Koster’), constituted the major pigments in pink flowers. Conversely, the flavonol contents of petal, such as kaempferol-3-glucoside, quercetin 3-glucoside, and rutin, were higher in white flowers. Hybrid RNA-sequencing obtained a total of 107,280 full-length transcripts in rose petal which were annotated in major databases. Differentially expressed gene (DEG) analysis showed that the expression of genes involved in the flavonoid biosynthesis pathway was significantly different, e.g., CHS, FLS, DFR, LDOX, which was verified by qRT-PCR during flowering. Additionally, two MYB transcription factors were found and named RmMYBAN2 and RmMYBPA1, and their expression patterns during flowering were also analyzed. These findings indicate that these genes may be involved in the flower color difference in the rose mutants, and competition between anthocyanin and flavonol biosynthesis is a primary cause of flower color variation, with its regulation reflected by transcriptional and secondary metabolite levels.

Nutraceutical Properties of Mulberries Grown in Southern Italy (Apulia).

In this work, for the first time, were analyzed mulberry genotypes grown in Apulia (Southern Italy, Salento region) were analyzed. Two local varieties of Morus alba (cv. Legittimo nero and cv. Nello) and one of Morus nigra were characterized for content in simple sugars, organic acids, phenols, anthocyanins; fruit antioxidant activity (AA) was also evaluated by three different methods (2,2-Diphenyl-1-picrylhydrazyl, DPPH; 2,2′-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), ABTS; and Ferric reducing antioxidant potential, FRAP test). The results showed that the sugars amount ranged between 6.29 and 7.66 g/100 g fresh weight (FW) while the malic and citric acids content was low, at about 0.1–1 g/100 g FW. Mulberries are a good source of phenols which are present in higher values in M. nigra and M. alba cv. Legittimo nero (485 and 424 mg Gallic Acid Equivalent (GAE)/ 100 g FW, respectively). The high performance liquid chromatography/diode array detector/mass spectrometry (HPLC/DAD/MS) analysis identified 5 main anthocyanin compounds present in different concentrations in each variety of mulberry: cyanidin 3-sophoroside, cyanidin 3-glucoside, cyanidin 3-rutinoside, pelargonidin 3-glucoside, pelargonidin 3-rutinoside. The highest concentration of anthocyanins was determined in Morus alba Legittimo (about 300 mg/100 g FW) while the lowest content (about 25 mg/100 g FW) was measured in M. alba cv. Nello. Morus nigra showed a good AA in comparison with the different M. alba genotypes with all the used methods; its AA was equal to 33, 26 and 21 μmols Trolox/g FW when using DPPH, ABTS and FRAP tests, respectively. All genotypes showed an anti-inflammatory activity (measured by cyclooxygenase (COX) inhibitory assay) which was also compared with two commercial anti-inflammatory drugs. The data obtained support the high biological qualities of mulberry fruits and their diffusion in human nutrition.

Relationship of phenolic composition of selected purple maize (Zea mays L.) genotypes with their anti-inflammatory, anti-adipogenic and anti-diabetic potential

This study aimed to investigate the associations between phenolic composition of selected purple maize genotypes and their anti-inflammatory, anti-adipogenic and anti-diabetic properties in vitro. Anthocyanin-rich water extracts (PMWs) from 20 purple maize genotypes were evaluated in RAW 264.7 macrophages and 3T3-L1 adipocytes under different conditions. Cyanidin-3-O-glucoside (C3G), pelargonidin-3-O-glucoside (Pr3G), peonidin-3-O-glucoside (P3G) and corresponding acylated forms were major anthocyanins in PMW, accompanied by ten tentatively identified non-anthocyanin phenolics. Correlation studies showed that C3G, P3G, and derivatives, but not Pr3G and its acylated form contributed to the biological properties of PMW. Besides anthocyanins, quercetin, luteolin, and rutin were the dominant anti-inflammatory and anti-diabetic components, in terms of down-regulating pro-inflammatory mediator production in inflamed macrophages and adipocytes, modulating diabetes-related key enzymes and improving insulin sensitivity in insulin-resistant adipocytes. Quercetin and phenolic acids, especially vanillic acid and protocatechuic acid, were closely associated with anti-adipogenic properties of PMW via inhibition of the preadipocyte-adipocyte transition.

Effect of exogenous sucrose on anthocyanin synthesis in postharvest strawberry fruit

Sucrose acts as a vital signal that modulates fruit ripening. In current study, 50 mM sucrose was applied in strawberry fruit to investigate the regulation of sucrose in anthocyanin synthesis after harvest. The results showed that sucrose treatment increased the contents of glucose, fructose and sucrose, which were 19.76%, 15.83% and 16.50% higher, respectively, compared with control at the end of storage. The increase of glucose and fructose contents resulted from the activation of acid invertase by sucrose treatment. In addition, sucrose treatment specifically increased four pelargonidin derivatives, pelargonidin 3-glucoside, pelargonidin 3-rutinoside, pelargonidin 3-malonylglucoside and pelargonidin 3-methylmalonyglucoside, during the storage. Further, transcriptional profiles and enzyme activities analysis revealed that the accumulation of pelargonidin derivatives was related to the activation of the pentose phosphate pathway, shikimate pathway, phenylpropanoid pathway, and flavonoid pathway. These results provided new insights into the regulation of sucrose on the accumulation of individual anthocyanins.

Urinary Excretion of Anthocyanins Following Consumption of Strawberry and Red Grape Juice.

The excretion of anthocyanins in urine following consumption of a mixed juice prepared from strawberry and red grape juice was investigated in a human intervention study. Unmetabolised anthocyanins, and glucuronide derivatives have been detected, with pelargonidin-3 glucoside metabolised into pelargonidin monoglucuronide and pelargonidin-3-glucoside monoglucuronide. The mass of urinary anthocyanins excreted in 24h following consumption of the mixed juice (containing 21.93mg of anthocyanins) was 144nmol consisting of 106nmol of anthocyanins derived from strawberries (0.32% of ingested dose) and 38nmol derived from red grapes (0.22% of ingested dose). A higher proportion of delphinidin-3-glucoside was excreted in the unmetabolised form than less polar anthocyanins (at p≤0.05). Excretion of anthocyanins peaked between 2 and 4h following consumption of the juice. The proportion of the ingested anthocyanins excreted was not significantly different for strawberry and red grape anthocyanins despite the differences in the structures.

Anthocyanins from colored maize ameliorated the inflammatory paracrine interplay between macrophages and adipocytes through regulation of NF-κB and JNK-dependent MAPK pathways

This study aimed to investigate the anti-inflammatory effect of two anthocyanin-rich extracts from purple (PMW) and red maize (RMW), in comparison to three pure anthocyanins [cyanidin-3-O-glucoside (C3G); peonidin-3-O-glucoside (P3G); pelargonidin-3-O-glucoside (Pr3G)] on the inflammatory states that occurred during the macrophage-adipocyte interaction, using both mono- and co-culture in vitro models. PMW and RMW reduced production of pro-inflammatory cytokines (TNF-α: −8.8% to −44.2%; MCP-1: −18.4% to −56.9%) in both macrophages and adipocytes mono-cultures. PMW and RMW, as well as C3G and Pr3G inhibited activation of NF-κB and JNK pathways, via regulation of phosphorylation of IκBα and JNK, respectively. Both extracts and pure anthocyanins restored inflammation-mediated oxidative stress and insulin resistance in macrophage-conditioned media-treated adipocytes. PMW and RMW decreased pro-inflammatory cytokine production and lipolysis, while enhanced the glucose transporter 4 membrane translocation in the adipocyte-macrophage co-cultures. These results suggested that colored maize anthocyanins could potentially ameliorate the paracrine interplay between adipocytes and macrophages.

Anatomical and biochemical analyses reveal the mechanism of double-color formation in Paeonia suffruticosa 'Shima Nishiki'.

Paeonia suffruticosa 'Shima Nishiki' is a very precious double-color cultivar because of its distinctive and colorful flowers. However, our understanding of the underlying mechanisms of its double-color formation is limited. The present study investigated the soluble sugar content, cell sap pH value and anatomical structure, anthocyanin composition and content and expression patterns of genes related to anthocyanin biosynthesis in the red and pink petals of the 'Shima Nishiki' cultivar. Here, we found that soluble sugar content, cell sap pH and the shape of outer epidermal cells were not the key factors that determine double-color formation. Five different anthocyanins were detected in both the red and pink petals, and the pelargonidin-3,5-di-O-glucoside (Pg3G5G) and pelargonidin-3-O-glucoside (Pg3G) contents in the red petals were significantly higher than those in the pink petals at every developmental stage. In addition, these gene expression patterns suggested that the significant differential expression of the dihydroflavonol 4-reductase gene (PsDFR) gene might play a key role in double-color formation. These results will provide a valuable resource for further studies unraveling the underlying genetic mechanisms of double-color formation in P. suffruticosa 'Shima Nishiki'.

Effect of thermosonication and thermal treatments on phytochemical stability of barberry juice copigmented with ferulic acid and licorice extract

Abstract This study was designed to compare the effect of thermosonication and thermal treatment on color and anthocyanins stability of natural and copigmented barberry juice during processing and storage. Addition of copigments significantly induced the hyperchromic effect and increased the total phenolic and antioxidant activity of barberry juice. Copigmentation especially at 1:2 M ratio, markedly enhanced the color and anthocyanin stability of barberry juice during processing. Thermal treatment negatively affected the phytochemical compounds, whereas thermosonication especially at low amplitude showed no significant changes. A similar trend in the degradation of anthocyanins and color instability of samples was observed during storage. Copigmentation, especially with licorice extract, considerably increased the half-life of anthocyanins and well preserved pelargonidin 3-glucoside and the color parameters of the juice during storage. The results indicate that licorice extract can be a good alternative to synthetic copigments and the application of thermosonication maintains the effectiveness of copigmentation reaction. Industrial relevance Barberry (Berberis vulgaris) is one of the most important medicinal plants which is mainly cultivated in Iran. Barberry fruits are used in preparing sauces, jellies, candies, marmalades and especially juice drinks. Like other berry fruits, barberry contains high amounts of anthocyanins. Due to the highly instability of these pigments, the preservation of these nutrients during industrial processing and storage of barberry juice is very important. Intermolecular copigmentation of anthocyanins with phenolic compounds, especially with phenolic extract from various plant species, is an efficient method to stabilize these compounds. Moreover, because of the adverse effect of thermal treatment on the copigmentation reaction and the degradation of nutritive compounds of fruit juice, there is a need for non-thermal processing techniques like sonication or high pressure to preserve the nutritional and sensory properties of juices. Therefore, in this study, for the first time, the simultaneous use of thermosonication and copigmentation with ferulic acid and licorice extract on the stability of color and anthocyanins of barberry juice was evaluated. The results of our study revealed that licorice extract due to having various flavonoid compounds such as liquiritin and isoliquiritin can be a good alternative to synthetic copigments. Furthermore, the application of thermosonication in comparison with thermal treatment maintains the effectiveness of copigmentation reaction.

Bioaccessibility of phenolic compounds in native and exotic frozen pulps explored in Brazil using a digestion model coupled with a simulated intestinal barrier

The bioaccessibility of phenolics and antioxidant activity were determined in açaí, cupuaçu, blackberry, blueberry, jabuticaba, raspberry, cajá and soursop frozen pulps (FPs) using a digestion model coupled with a simulated intestinal barrier. Cyanidin 3-glucoside (6.56%) and pelargonidin 3-glucoside (28.33%) were bioaccessible in blueberry and raspberry. Catechin had the highest bioaccessibility in blueberry (270.71%), blackberry (137.51%), and jabuticaba (99.52%), while the highest bioaccessibility of epicatechin (153.59%) and syringic acid (147.14%) was observed in blueberry. Procyanidin B1 presented the highest bioaccessibility in cajá (102.79%) and blackberry (87.62%) and contributed to the high DPPH▪ scavenging activity observed in these FPs. The bioaccessible fraction in soursop consisted of caffeic (8.18%), p-coumaric (7.36%), caftaric (7.96%) and chlorogenic (11.08%) acids, and these acids were correlated with the iron reduction capacity of this FP. Our study assessed the bioaccessible phenolics in several FPs and showed that those found in cajá and blackberry possesses the highest antioxidant activity.

Comparison of forage yield, silage fermentative quality, anthocyanin stability, antioxidant activity, and in vitro rumen fermentation of anthocyanin-rich purple corn (Zea mays L.) stover and sticky corn stover

The objective of this study was to observe the forage yield, silage fermentative quality, anthocyanin stability, and antioxidant activity during the storage period and in vitro rumen fermentation of anthocyanin-rich purple corn (Zea mays L.) stover (PS) and sticky corn stover (SS). Forage yield of corn stover was weighed and ensiled with two treatments: (1) hybrid sticky waxy corn stover (control), and (2) hybrid purple waxy corn stover (treatment). Samples were stored in mini-silos for periods of 0, 7, 14, 21, 42, 63, 84, and 105 d. The results showed that PS had significantly higher (P<0.05) yields of dry matter (DM), organic matter (OM), gross energy (GE), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), and total anthocyanins than that of the SS. Anthocyanin-rich purple corn stover silage (PSS) showed higher (P<0.05) levels of DM and CP relative to the sticky corn stover silage (SSS). Although anthocyanin-rich PSS displayed a lower (P<0.05) level of pelargonidin-3-glucoside (P3G), it had higher (P<0.05) levels of peonidin (Peo) and pelargonidin (Pel) compared to the control. Delphinidin (Del) and malvidin (Mal) were not detected in SSS during the ensilage period; in PSS, Del was no longer detected after 7 d of ensilage. Specifically, total anthocyanins in anthocyanin-rich PSS decreased rapidly (P<0.05) prior to 7 d of ensilage, and then remained at relatively stable (P>0.05) constants. Compared to the anthocyanin-rich PSS, SSS displayed significantly higher (P<0.05) pH value and ammonia nitrogen (NH3-N) content. Propionic acid (PA) at 0 d and butyric acid (BA) during the entire study period were not detected, whereas anthocyanin-rich PSS showed a higher (P<0.05) level of lactic acid (LA) than that of the SSS. Compared with the SSS extract, anthocyanin-rich PSS extract showed a higher (P<0.05) level of 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity and displayed a lower (P<0.05) half maximal inhibitory concentration (IC50) value. Moreover, anthocyanin-rich PSS reduced (P<0.05) gas production (GP), and displayed lower levels of immediately soluble fraction and ratio of acetic acid (AA) to PA at 12 h, but the other parameters were unaffected (P>0.05) relative to the control. Taken together, the results indicated that: (1) anthocyanins could be stable in silage; (2) anthocyanin-rich PSS showed better silage fermentative quality and stronger antioxidant activity; and (3) anthocyanin-rich PSS had no negative effect on rumen fermentation parameters.