Author: Palomares-Báez, Juan P. ; Marquez-Rodriguez, Ana S. ; Fuentes-Montero, María E. ; Palomares-Baez, Juan P. ; Ballinas-Casarrubias, Maria L. ; Salas, Erika ; Nápoles-Duarte, José M. ; Ballinas-Casarrubias, María L. ; Fuentes-Montero, Maria E. ; Napoles-Duarte, Jose M. ; Márquez-Rodríguez, Ana S. ; Carrion, Arasay ; Fuentes-Cobas, Luis E. ; Trejo, Felipe ; Esparza-Ponce, Hilda E. ; Carrión, Arasay

Anthocyanins are natural pigments responsible for color in fruits and flowers.They are unstable to diverse ambient conditions like pH, light, or the presence of ions.Thus, in industry, several techniques are employed to protect and use anthocyanins.Likewise, ancient Mayas used clay and indigo extract to prepare a pigment known as Maya Blue, resistant to time and chems.For this reason, this work aims to characterize the hibiscus extract and sepiolite bio-hybrids created according to Maya methodol. and observe the stability of anthocyanins, which are color-responsible in flowers and fruits.Spectral anal. shows that anthocyanins and color were more stable than controls.Powder bio-hybrids show less color change under UV radiation and allochroic behavior in acid or alk. atmospheres.At the same time, spectroscopy analyses and X-ray diffraction show no chem. interaction between sepiolite and hibiscus compoundsOur mol. dynamics with Reactive Force Fields (ReaxFF) studies reveal a similar behavior.Thus, our method protected the color of anthocyanins, in the temperature range from 15 to 35 °C.The interaction of hibiscus compounds with clay is due to van der Waals forces.

01 Dec 2024·Food Chemistry

External browning mechanism in walnut kernel pellicles under different drying conditions based on the combination of widely-targeted and anthocyanin-targeted metabolomics

Article

Author: Li, Qingyang ; Shen, Danyu ; Sun, Shiman ; Guo, Yirong ; Mo, Runhong ; Tang, Fubin ; Liu, Yihua

There has been limited research on external browning (EB) of walnut. This work discovered 1888 metabolites and 34 anthocyanins in walnut pellicles (WPs) after three drying methods using widely-targeted and anthocyanin-targeted metabolomics. Based on OPLS-DA and correlation analysis, 64 temperature-responsive metabolites (TRMs; 13 anthocyanins and 51 flavonoids) were identified as critical components in relation to EB. Notably, 14 flavonoids exhibited a strong positive correlation (r > 0.9) with the browning index (BI), with upregulation of >60% after browning. Most of the identified anthocyanins were negatively linked with BI because of degradation (>45%), with correlation coefficients ranging from 0.75 to 0.97. Furthermore, anthocyanidin reductase and laccase were the two key enzymes involved in the EB of WPs, with their activities increasing by 10.57-fold and 1.32-fold, respectively, with increasing drying temperature. A metabolic pathway network of the TRM was built to provide insights into the potential mechanisms underlying EB in WPs.

01 Dec 2024·Food Chemistry: X

Comparative study of polysaccharide metabolites in purple, orange, and white Ipomoea batatas tubers

Article

Author: Xiao, Qiang ; Wu, Jiaqi ; Wan, Xiaolin ; Wang, Xiuzhi ; Cui, Lingjun

We employed LC-MS/MS to investigate the metabolic profiles of polysaccharide compounds in white, orange, and purple sweet potato flesh. Comparisons between Orange vs White, Purple vs Orange, and Purple vs White identified 69 polysaccharide metabolites, including 23, 36, and 44 differential metabolites, respectively, with distinct differentiation. Among the three sample groups, 14 polysaccharide compounds and 2 anthocyanins exhibited significant differences. Our further analysis indicated that anthocyanins occupy a central position in the related network diagram and are interconnected with polysaccharides. In metabolic pathways, sucrose and the anthocyanin precursor UDP-glucose were upregulated in purple sweet potatoes, along with elevated levels of pelargonidin 3-O-β-D-sambubioside and delphinidin 3,5-diglucoside. Conversely, sucrose was downregulated in purple sweet potatoes while increasing in white and orange varieties. Therefore, we hypothesize that the competition between sugars and anthocyanins for shared biosynthesis precursors is attributed to differential polysaccharide metabolites among sweet potato tubers of three colors.

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Indication	Highest Phase	Country/Location	Organization	Date
Cardiovascular Diseases	Phase 1	-	Oryza Oil & Fat Chemical Co. Ltd.	-
Cardiovascular Diseases	Phase 1	-	Keio University	-

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