Red-purple Color Research Articles

Encapsulated betalains (Opuntia ficus-indica) as natural colorants. Case study: Gummy candies

Gummy candies were selected as model food system to incorporate betalain-rich capsules (BC) obtained by ionic gelation with calcium alginate from a betalain-rich extract of Opuntia-ficus-indica fruit. Ten formulations were obtained by a factorial design (2 × 5) with two types of gelatin (GA and GB), and five betalain-rich capsules/gelatin (BC/G) ratios (from 70/30 to 30/70). The rheological and morphological properties of all formulations were studied, finding that the viscoelastic, gel strength, and stress relaxation properties were dependent on the G type content in the ratio BC/G. Optical micrographs also showed that G type, bloom, and BC/G ratio had a marked influence on the gummy candies structure. These data suggested that the G addition in higher concentrations allows to develop a more rigid gel. The betanin stability in the food system was evaluated during storage at 4 °C for 30 days and there was no significant variation in total colour parameters for all samples (ΔE∗ values less than four). Thus, the stability of the betalain colour in the gummy candy was confirmed, exhibiting this food product a vivid red-purple colour, such representing a promising application for these natural pigments in food industry.

Investigation of stability of colorant powders extracting from Japanese purple sweet potato (Ipomoea batatas (L.) Poir)

The stability of colorant powders from Japanese purple sweet potato (Ipomoea batatas (L.) Poir) harvested in Vinh Long province was investigated. The colorants were formed from extracting solutions which were adjusted to pH of 6, 5, 4 and 3 before converted to powder matrix. They had red-purple color and contained anthocyanin concentration of about 32 mg/g. The IC50 inhibitory concentration of the neutral powder was 292.7 μg/mL, whereas the IC50 of pH3 powder was 484 μg/mL, which antioxidant activity decreased by increasing of acidic media clearly. Stability of appearance colors, anthocyanin content, polyanthocyanin index and antioxidant capacity were investigated and they depended on storing conditions (temperature and radiation) and pH media. To avoid denaturation of anthocyanin content, the pigment should be stored in the dark and at low temperature (10 °C). The acidic media could preserve the colorant powder by protecting anthocyanins, but it reduced the biological property of the pigment.

Karakteristik Mutu Sirup Bit dengan Penambahan Carboxymethyl Cellulose

This research aimed to study the influence of addition of carboxymethyl cellulose (CMC) and to get the best CMC concentration in making of beet syrup. The research was conducted with five treatments and three replications. The treatments in this study were CMC addition of 0.3%, 0.6%, 0.9%, 1.2%, and 1.5%. Data were statistically analyzed by using analysis of variance and followed by duncan new multiple range test at level 5%. The result of analysis of variance showed that the influence of CMC had significantly affected pH, total dissolved solid, sucrose level, and viscosity. The treatment also significantly effected aroma and hedonic test, but didn’t significantly affected colour and flavor of beet syrup. Based on this research, the best treatment was syrup with 0.9% CMC addition which had pH 5.75, total dissolved solids 71.16°brix, viscosity 351.56 cP, and sucrose level 69.68%. Characteristics of best treatment syrup based on descriptive test were red purple colour, beet root flavor, sweet taste, thick, and on hedonic test was favored by panelists.Keywords: Syrup, beet root, carboxymethyl cellulose (CMC)

Amended definitions for Aplysinidae and Aplysina (Porifera, Demospongiae, Verongiida): on three new species from a remarkable population in the Gulf of California.

Verongiid sponges inhabiting the La Paz region, Gulf of California are described herein as new species. Although morphological evidence was sufficient to determine the identity between species, we have confirmed their uniqueness and relationships with molecular (CO1 and ITS1 and 2), and ecological studies. An amended definition of family Aplysinidae and genus Aplysina is presented to highlight a novel skeletal trait for the latter, clearly described herein as a complex of dendritic fibers sustained by anastomosed fibers deep in the choanosome. This novel fiber arrangement combination is a constant trait of Aplysina encarnacionae sp. nov. and A. airapii sp. nov., which otherwise conform to our current concept of Aplysina. The former species has a long tubular morphology, reddish purple color, with the longest dendritic fibers; while A. airapii sp. nov. is a short tubular sponge, yellow with reddish tints, and smaller choanosomal dendritic fibers that depart from a uniplanar anastomosed skeleton. A third species, A. sinuscaliforniensis sp. nov., is characterized by a completely anastomosed skeleton, massive habit with short tubes superimposed one over the other, sympatric with the other new species. Comparisons with Suberea azteca verified that the same novel skeletal architecture described here occurs in the latter, while Aiolochroia thiona examined as well, proved to bear an anastomosed skeleton only, besides sharing more features with Aplysina than with any other genera in Verongiida. Moreover, molecular sequencing recovered "S." azteca nested in the Aplysina clade, prompting us to reallocate it in Aplysina, as originally proposed. The new species described herein are probably endemics within the Gulf of California since they have not been recorded elsewhere along the Mexican Pacific coast.

De novo assembly and comparative transcriptome analysis reveals genes potentially involved in tissue-color changes in centipedegrass (Eremochloa ophiuroides [Munro] Hack.)

Turf color is the most important characteristics of visual quality for a turfgrass species with high ornamental value and wide application prospects. Centipedegrass is a well-adapted warm-season turfgrass species in tropical, subtropical and temperate regions, possessing many outstanding properties including uniform green color. However, quite a few centipedegrass accessions or cultivars produce stolons and spike tissues with red-purple color, thereby decreasing their aesthetic value. A research focus in centipedegrass is to develop high-quality cultivars with uniform green color. To explore the major genes associated with the color changes in certain organs/tissues contributes to understand the molecular mechanisms of the same tissues having different phenotypic characteristics. In the present study, two phenotypically distinct centipedegrass accessions, E092 being a wild-type (WT) with red-purple stolons and spike tissues and E092-1 being a mutant (MT) with uniform green stolons and spike tissues, were used. Using the Illumina sequencing platform, approximately 401.7 million high-quality paired-end reads were obtained. After de novo assembly and quantitative assessment, 352,513 transcript sequences corresponding to 293,033 unigenes were generated with an average length of 735 bp. A total of 145,032 (49.49%) unigenes were annotated by alignment with public protein databases. Of these unigenes, 329 differentially expressed genes (DEGs) were identified between WT and MT stolons, with 156 up-regulated and 173 down-regulated; and 829 DEGs were detected between WT and MT spike tissues, including 497 up-regulated and 332 down-regulated. The expression profile of 10 randomly selected DEGs was confirmed with RT-qPCR. Candidate genes involved in the flavonoid biosynthesis were identified showing significant transcript changes between WT and MT organs/tissues. And transcript abundances of these flavonoid biosynthetic pathway-related genes were positively correlated with the accumulation of total anthocyanin in respective organs/tissues. This assembled transcriptome of centipedegrass can be served as a global description of expressed genes of above-ground organs/tissues and provide more molecular resources for future functional characterization analysis of genomics in warm-season turfgrass. Identified genes related to centipedegrass organ/tissue changes will contribute to molecular improvement of turf quality through genetic manipulation.

Effect of refrigerated storage on betacyanin composition, antibacterial activity of red pitahaya (Hylocereus polyrhizus) and cytotoxicity evaluation of betacyanin rich extract on normal human cell lines

Red pitahaya fruit is rich in purplish-red color water-soluble betacyanins. The effect of refrigerated storage at 4 °C on the betacyanin composition of red pitahaya was monitored each day, for one week, using HPLC. The betacyanin content of red pitahaya had increased by 57.2% after storage for six days at 4 °C. From day 2 to day 7, the phyllocactin content decreased from 45.4 ± 1.5% to 38.3 ± 3.1%, whereas the betanin content increased from 37.9 ± 1.6% to 42.7 ± 1.5%. Antimicrobial activity was determined using the broth microdilution assay and expressed as minimum inhibitory concentration (MIC). As compared to the freshly harvested fruits (MIC values: 50,000–>50,000 μg mL−1), fruits that were stored for six days at 4 °C demonstrated better antimicrobial activity (MIC values: 3130–6250 μg mL−1) against 10 pathogenic Gram-positive and 6 Gram-negative bacteria. Betacyanin rich extract was also examined against normal human cell lines (HEK-293 and THP-1) and found to be not cytotoxic at the levels of 0.39–3.13 mg mL−1. In summary, refrigerated storage for 6 days increased the betacyanin content, changed the betacyanin composition in red pitahaya and contributed to higher antimicrobial activity.

Development of uracil-DNA-glycosylase-supplemented loop-mediated isothermal amplification coupled with nanogold probe (UDG-LAMP-AuNP) for specific detection of Pseudomonasaeruginosa.

Pseudomonas aeruginosa (P. aeruginosa) is an important opportunistic pathogen that causes serious infections in humans, including keratitis in contact lens wearers. Therefore, establishing a rapid, specific and sensitive method for the identification of P. aeruginosa is imperative. In the present study, the uracil-DNA-glycosylase-supplemented loop-mediated isothermal amplification combined with nanogold labeled hybridization probe (UDG-LAMP-AuNP) was developed for the detection of P. aeruginosa. UDG-LAMP was performed to prevent carry over contamination and the LAMP reactions can be readily observed using the nanogold probe. A set of 4 primers and a hybridization probe were designed based on the ecfX gene. The UDG-LAMP reactions were performed at 65°C for 60 min using the ratio of 40% deoxyuridine triphosphate to 60% deoxythymidine triphosphate. The detection of UDG-LAMP products using the nanogold labeled hybridization probe, which appeared as a red-purple color, was examined at 65°C for 5 min with 40 mM MgSO4. The UDG-LAMP-AuNP demonstrated specificity to all tested isolates of P. aeruginosa without cross reaction to other bacteria. The sensitivity for the detection of pure culture was 1.6×103 colony-forming units (CFU) ml−1 or equivalent to 3 CFU per reaction while that of polymerase chain reaction was 30 CFU per reaction. The detection limit of spiked contact lenses was 1.1×103 CFU ml−1 or equivalent to 2 CFU per reaction. In conclusion, the UDG-LAMP-AuNP assay was rapid, simple, specific and was effective for the identification of P. aeruginosa in contaminated samples.

Bacterial cyclic β-(1,2)-glucans sequester iron to protect against iron-induced toxicity.

Cellular iron homeostasis is critical for survival and growth. Bacteria employ a variety of strategies to sequester iron from the environment and to store intracellular iron surplus that can be utilized in iron-restricted conditions while also limiting the potential for the production of iron-induced reactive oxygen species (ROS). Here, we report that membrane-derived oligosaccharide (mdo) glucan, an intrinsic component of Gram-negative bacteria, sequesters the ferrous form of iron. Iron-binding, uptake, and localization experiments indicated that both secreted and periplasmic β-(1,2)-glucans bind iron specifically and promote growth under iron-restricted conditions. Xanthomonas campestris and Escherichia coli mutants blocked in the production of β-(1,2)-glucan accumulate low amounts of intracellular iron under iron-restricted conditions, whereas they exhibit elevated ROS production and sensitivity under iron-replete conditions. Our results reveal a critical role of glucan in intracellular iron homeostasis conserved in Gram-negative bacteria.

Fermi surfaces properties of AuAl2, AuGa2, and AuIn2 with the CaF2-type cubic structure

We grew high-quality single crystals of AuAl2, AuGa2, and AuIn2 with the fluorite (CaF2)-type cubic structure and determined the Fermi surface properties by the de Haas-van Alphen (dHvA) experiments using full-potential LAPW bad calculations. The Fermi surface and optical properties for three compounds were once studied from an interest of colors because AuAl2 has a striking bright reddish-purple color, whereas AuGa2 and AuIn2 are, respectively, neutral and bluish. The detected dHvA frequencies in the present study are found to be in a wide range of (0.1–13)×107Oe. The main dHvA branches for three compounds are in excellent agreement with the theoretical ones, but some dHvA branches with small dHvA frequencies are slightly deviated from the theoretical ones, especially in AuGa2 and AuIn2.

Caracterização morfológica de fruto, semente e plântula de Psidium rufum DC. (Myrtaceae)

The objective of this study was to describe and illustrate the morphology of fruits, seeds and seedlings of Psidium rufum DC. in order to assist diff erent disciplines, such as taxonomy and forestry. The species is a fruit that is not cultivated, but has great ecological potential. For structure characterization and germination stage descriptions, 100 units of random fruits and seeds of Curitiba and Ponta Grossa, Parana were used. P. rufum fruit is smooth, shiny, hairless, with a red-purple color when ripe, so globosa, fl eshy and indehiscent type bacoide. The seeds are campylotropous, reniform, with smooth, opaque and stony seed coat, and presented a possible endospermatic tissue and linseed in cream coloring. The embryo is of the pimentoide type and germination is epigeous phanerocotyledonal, starting on day 15 and extending to day 37. The morphological characteristics presented are useful in helping identify P. rufum.

A sensitive colorimetric determination of cyanuric chloride and its activated agarose immobilization resins

A colorimetric method for determining cyanuric chloride (CC) and for monitoring its polysaccharide gel activation, before and after ligand binding, was developed. The method is based on the reaction of CC or its activated gel with pyridine and barbituric acid or dimethylbarbituric acid. The product formed yields a purple red color with λ max at 595 nm, and an EM value of approximately 300,000 after 1 h at room temperature.Due to its high sensitivity, this method can detect traces of CC (1 μM) under the above conditions. The method is fast, reliable and devoid of any side reactions.

Red-purple flower color and delphinidin-type pigments in the flowers of Pueraria lobata (Leguminosae)

A previously undescribed acylated anthocyanin was extracted from the red-purple flowers of Pueraria lobata with 5% HOAc-H2O, and determined to be petunidin 3-O-(β-glucopyranoside)-5-O-[6-O-(malonyl)-β-glucopyranoside], by chemical and spectroscopic methods. In addition, two known acylated anthocyanins, delphinidin 3-O-(β-glucopyranoside)-5-O-[6-O-(malonyl)-β-glucopyranoside] and malvidin 3-O-(β-glucopyranoside)-5-O-[6-O-(malonyl)-β-glucopyranoside] were identified. Delphinidin 3,5-di-glucoside, petunidin 3,5-di-glucoside, and malvidin 3,5-di-glucoside, have been known as major components of P. lobata in the former study. However, malonyl esters amounts were detected over 10 times compared with non-malonyl esters amounts. In those anthocyanins the most abundant anthocyanin was petunidin 3-O-(β-glucopyranoside)-5-O-[6-O-(malonyl)-β-glucopyranoside] in total flowers.On the visible absorption spectral curve of fresh red-purple petals, one characteristic absorption maximum was observed at 520 nm, which is similar to those of flowers containing pelargonidin derivatives. In contrast, the absorption spectral curve of old violet petals was observed at 500(sh), 536, 564(sh), and 613(sh) nm, which are similar to those of violet flowers containing delphinidin-type pigments. Pressed juices of both fresh red-purple petals and old violet petals had pH5.2 and 5.5 respectively, and had the same flavonoid constitution. Crude fresh red-purple petal pigments extracted by pH 2.2 and pH 5.2 buffers exhibited the same color and spectral curves as fresh red-purple petals and old violet petals, respectively. Moreover, in a cross-TLC experiment of crude extracted pigments, red-purple color was exhibited by the anthocyanin region and the crossed region of anthocyanins and isoflavone. Thus, it may be assumed that the unusually low pH in the vacuole of fresh petals plays an important role to form red-purple flower color against weak acidic pH in the vacuole of old violet P. lobata petals.

Application of newly-developed dichlorvos–ammonia (DV–AM) method to direct isolation of aflatoxigenic fungi from field soils

We recently devised the dichlorvos–ammonia (DV–AM) method, a sensitive and simple visual method for detecting aflatoxigenic strains. The DV–AM method enables a prominent distinction of red (positive; aflatoxin-producing) colony from pale-yellow (negative; non-aflatoxigenic) colony via brilliant purple-red color of the backside of positive colonies. We used the DV–AM method to screen aflatoxigenic fungi from soil samples in Tsukuba, Ibaraki, Japan. We herein isolated seven positive (red) colonies and four negative (pale-yellow) colonies from one of the 100 independent samples. Chemical analyses demonstrated that these red isolates produced aflatoxins B1 and B2 without aflatoxins G1 nor G2. In contrast, 4 pale-yellow colonies with similar phenotypes to the Aspergillus flavus group were confirmed to be non-aflatoxigenic fungi. Morphological and phylogenic analyses of one positive strain (HA9-S1-1) indicated that it was A. flavus or its closely related species of Aspergillus. These aflatoxigenic strains showed differences in aflatoxin production, morphological characteristics, and sclerotia formation, suggesting that different types of aflatoxigenic strains were present in the same soil. These results demonstrated that the DV–AM method is practically useful for the direct isolation of aflatoxigenic and non-aflatoxigenic fungi from field samples.

Self-assembled nanohelix from a bolaamphiphilic diacetylene via hydrogelation and selective responsiveness towards amino acids and nucleobases.

A bolaamphiphile with diacteylene mesogen unit and l-glutamic acid as the terminal group was newly designed and its self-assembly was investigated. The compound formed hydrogels with water upon heating and cooling. The as-formed gel could be switched to a dispersion upon mechanical shaking. Both the gel and the water dispersion undergo polymerization upon UV irradiation. However, the gel turned to blue and then purple red color, while the dispersion turned red directly. Using AFM and SEM observations, it was found that nanohelix was formed in the as-prepared gel and polymerized blue gels, while nanobelt was formed from the water dispersion. The blue nanohelix was stable but showed selective response to certain amino acids and nucleobases. It was found that the blue gel underwent shrinkage when reacting with charged amino acids such as Glu, Asp, Lys, Arg and His. In the shrunk gel, the solution phase further turned pink in the case of His and Arg. In addition, the blue gel showed also shrinkage and color change when reacting with cytosine.

Inheritance of leaf and flower morphologies in Kalanchoe spp.

Members of the genus Kalanchoe are morphologically diverse; this increases their commercial value. Understanding the genetic mechanism of development of morphological characters could contribute to parent screening and offspring selection in future breeding programs. In this study, we investigated the inheritance of leaf color, leaf shape, anther color, and flower orientation of Kalanchoe species or varieties. Kalanchoe garambiensis, K. garambiensis G., K. gracilis, K. spathulata, and K. manginii ‘Wendy’ were used as experimental parents to establish self and interspecific crosses. The separation ratios of the leaf and flower traits were analyzed using Chi square tests. The results showed that all progenies produced by selfing of K. garambiensis (purple leaf phenotype) had purple leaves, whereas those from selfing of K. garambiensis G. (green leaf phenotype) exhibited green and purple leaves at a ratio of approximately 3:1. The S1 and S2 populations of K. garambiensis G. exhibited an expected 3:1 ratio of leaf color, whereas the S3 populations produced all green leaf inbred lines. Reciprocal hybridization of the progenies of K. gracilis (deeply lobed leaf) with K. garambiensis G. (shallowly lobed leaf) resulted in a 1:1 ratio of shallowly lobed leaves to deeply lobed leaves. The progenies of the two cross combinations (K. garambiensis G. × K. manginii ‘Wendy’ and K. garambiensis × K. manginii ‘Wendy’) produced upright-type flowers and anthers having purplish red color. These findings suggested that leaf color, leaf shape, anther color, and flower orientation of Kalanchoe are controlled by a single pair of alleles. Green leaf, deeply loped leaves, purplish red anthers, and upright-type flowers were found to be dominant traits.

Peripheral giant cell granuloma – case report

Abstract Peripheral giant cell granuloma (PGCG) or “Epulis gigantocelularis” is the most common oral lesion that originates from giant cells. It typically manifests in the form of soft tissue tumor purple-red or red-watery color consisting of multinuclear giant cells in the mononuclear stroma and extravascular erythrocytes. This lesion is not considered true neoplasm, rather reactive lesion stimulated by local irritation and trauma. However, the cause is not known with certainty. This paper presents a 13-year-old boy with a large lesion in the region of right maxillary canine that was retained in jaw despite favorable vertical position and available space to accommodate in the dental arch. The lesion was completely removed under local anesthesia and histopathological findings confirmed the diagnosis of PGCG. Postoperative period went without complications. After four months additional surgical procedure was needed due to the recurrence, which after tooth naturally erupted and positioned in the dental arch.

BETACYANIN ASSAYS OF FRUIT BEET (Beta vulgaris L.) WITH SOLVENT ETHANOL AS A BIOLOGY LEARNING OBJECT MATERIAL

Beet (Beta vulgaris L.) or often also known as beet root is a plant form that is similiar roots and tubers family Amaranthaceae. Physical characteristics of fruit bits are round like a potato tuber with a dark red-purple color and its fruit will be cut when the line visible in white with pink. In bits are main components of the pigment betasianin. Betasianin are dyes that cangive red color, can be found in fruits, flowers and vegetative tissues. Betasianin canbe used as natural dyes in food. The purpose of this study was to determine the anthocyanin content test on beet (Beta vulgaris L). This type of research is True Experimental Research. The study design used is The Posttest-Only Control Group Design. The design ofthis study using a completely randomized design (CRD). The solvent comprises ethanol percentage of 80%, 50%, 20% and 0% for the control treatment. The data in this study of value betasianin levels. Analysis of the data in this study using analysis of variance of the factors where the results of this study indicate the best treatment of data betasianin assay lies in ethanol with a percentage of 50% with a value of 0.089. This can have an influence because the volume ratio of water and ethanolis the same.

Modeling Inactivation of Candida inconspicua Isolated from Turnip Juice using Pulsed UV Light

AbstractTurnip juice (Shalgam) is a traditional Turkish beverage with sour flavor and purplish red color, which is produced by the lactic acid fermentation of black carrot. Due to its rich antioxidant content, Turnip juice offers some health benefits. However, the preservation of Turnip juice is a main challenge for the producers. While the growth of bacteria is supressed by lactic acid, wild yeasts can readily grow in Turnip juice. In this study, the effect of pulsed UV light (PUV) on Candida inconspicua in Turnip juice was evaluated. Inoculated Turnip juice samples were treated in a pulsed UV light system at different distances from the quartz window (5, 8 and 13 cm) and for different times (5, 15, 30, 45 and 60 s). A maximum log reduction of 2.80 was obtained after treatment at 5 cm for 60 s. To describe the inactivation of C. inconspicua by pulsed UV light, the first‐order kinetics and Weibull model were used. Weibull model was found to be suitable for fitting the inactivation data.Practical ApplicationsTurnip juice (Shalgam) is a traditional fermented beverage produced from black carrots, which is a suitable growth medium for yeasts. The wild yeast Candida inconspicua was identified as a microorganism causing spoilage in Shalgam. The only methods utilized in industry to preserve shalgam are heat pasteurization and addition of chemical food additives. Due to the fact that thermal methods can cause the loss of anthocynanins and colorants, a nonthermal method could be a good alternative to preserve Shalgam. In this research, the effect of pulsed UV light, a novel method considered to be nonthermal for short treatment times, on the yeast C. inconspicua which was isolated from Shalgam was investigated. The results were supported with models to understand the effect of pulsed UV light on C. inconspicua cells for future applications in food industry and to direct other related inactivation studies.

Suitability for Processing of Some Sweet Cherry Varieties

Due to the high taste attributes, specific appearance and flavour, as well as their importance in nutrition, cherries occupy an important role in fresh consumption, but also processed. The paper presents the results of sensory analysis of four processed products (confiture, jam, nectar, syrup), made from five varieties of cherries (Van, Stella, Severin, Boambe de Cotnari, Gesmerdorf) grown at Research Station for Fruit Growing Constanta. Processing was done at Horting - Bucharest and organoleptic tests were performed according to STAS 12656-88. Alimentary products. Sensory analysis. Methods with scales of points, which establishes, depending on the score obtained, five quality classes for processed products: (18.1-20.0 points), (15.1-18.0 points), (11.1-15.0 points), unsatisfactory (7.1-11.0 points) and improperly (0 -7.0 points).   The viability for processing is a variety characteristic. On the first place ranks in consumer preferences variety Van, which received high scores for all four sort of products: 19.60 points for confiture, 19.74 points for jam, 20.0 points (maximum) for nectar and 19.86 points for syrup, appointing thus for 4 times in the category of produces very good. The last place is occupied by Boambe de Cotnari variety, which obtained the following score: good for confiture (15.99 points), jam (17.04 points) and nectar (15.88 points) and satisfactory “ for syrup (13.91 points). In the case of nectar and syrup this is explained by the fact that the consumer has shown preference for the purple red colour of products, with a strong visual impact.

Antioxidant Japanese plum (Prunus salicina) microparticles with potential for food preservation

Fibre microparticles (MPCs) obtained from Japanese plum (Prunus salicina) skin and flesh through ethanolic extraction retained polyphenolic compounds, mainly proanthocyanidins, in 170–200 mg/100 g MPCs levels. Also, phenolics such as anthocyanins (cyanidin 3-galactoside and 3-rutinoside), responsible for red-purple colour, and flavonoids (quercetin derivatives), were found in significant proportions only in the skin MPCs. The MPCs-polyphenolic extract showed antioxidant capability (DPPH and FRAP assays) as well as protective effect against the oxidative stress induced by tert-butylhydroperoxide (t-BOOH) when biologically evaluated on kidney cells, joined to a low cytotoxicity (50%-cytotoxic concentration >100 µg/mL). This is important since health benefits of barely absorbed proanthocyanidins rest on their permanence into the intestine, interfering with oxidative stress implicated in inflammatory disorders. Higher proportions of pectins found in flesh MPCs and of lignin in skin MPCs can provide different fibre functionality. Plum MPCs obtained can be useful as antioxidant natural additives and ingredients for functional food preservation.