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Together, Nobel Prize honoured work, mathematics, physics and the laws of nature have drawn a concept of clockwise cycling carboxylic acids in Krebs' Citric Acid Cycle. A Citric Acid Cycle complex is defined by specific substrate, product and regulation. Recently, the Citric Acid Cycle 1.1 complex was introduced as an NAD-regulated cycle with the substrate, lactic acid and the product, malic acid. Here, we introduce the concept of the Citric Acid Cycle 2.1 complex as an FAD-regulated cycle with the substrate, malic acid and the products, succinic acid or citric acid. The function of the Citric Acid Cycle 2.1 complex is to balance stress situations within the cell. We propose that the biological function of Citric Acid Cycle 2.1 in muscles is to accelerate recovery of ATP; whereas in white tissue adipocytes our testing of the theoretical concept led to the storage of energy as lipids.
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http://dx.doi.org/10.1016/j.heliyon.2023.e15968 | DOI Listing |
Food Chem
September 2025
Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain; Universidad de Alcalá, Instituto de Investigación Química Andrés M. del Río, Ctra. Madrid-Barcelona Km. 33.600, 28871
This study develops, for the first time, a sustainable method to extract extractable (EPPs) and non-extractable polyphenols (NEPs) from lemon peels using microwave-assisted extraction (MAE) with biobased solvents. A simplex-centroid design optimized EPPs extraction using γ-valerolactone (GVL), ethyl acetate (EtAc), and cyclopentyl methyl ether (CPME) (59.4:37:3.
View Article and Find Full Text PDFPlant Physiol
September 2025
National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan 430070, PR China.
Lemon (Citrus limon L.), an economically important Citrus species, produces high levels of citric acid. However, the regulatory mechanisms underlying citric acid accumulation in lemon fruit are poorly understood.
View Article and Find Full Text PDFInt J Biol Macromol
September 2025
Key Lab of Rubber-Plastics, Ministry of Education/Shandong Provincial Key, Lab of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China. Electronic address:
A dynamically crosslinked network VEC (vulcanized ESO and CA) was synthesized in situ via zinc acetate-catalyzed epoxy ring-opening between epoxidized soybean oil (ESO) and anhydrous citric acid (CA), then incorporated into polylactic acid (PLA)/polybutylene adipate terephthalate (PBAT) blends to enhance interfacial compatibility. The dynamic ester-exchange network acted as an intermediate phase, improving the integration of the flexible PBAT phase within the rigid PLA matrix. VEC content critically influenced mechanical properties, with in-situ crosslinking during dynamic vulcanization enhancing chain interactions and blend homogeneity.
View Article and Find Full Text PDFFood Chem
August 2025
Food Process Engineering Laboratory, Department of Chemical Engineering, Alagappa College of Technology, Anna University, Guindy, Chennai 600 025, India.. Electronic address:
A sustainable and energy-efficient method was developed to extract bioactive compounds from black cardamom (Amomum subulatum) using microwave-assisted extraction (MAE) with Natural Deep Eutectic Solvents (NADES). Six NADES composed of choline chloride, lactic acid, citric acid, glucose, and sucrose were prepared by heating and stirring. Lact:Suc and Lact:Gluc, showed the highest extraction efficiencies.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
September 2025
Department of Radiation Oncology, Stanford University, Stanford, CA 94305.
Reduced mitochondrial quality and quantity in tumors is associated with dedifferentiation and increased malignancy. However, it remains unclear how to restore mitochondrial quantity and quality in tumors and whether mitochondrial restoration can drive tumor differentiation. Our study shows that restoring mitochondrial function using retinoic acid (RA) to boost mitochondrial biogenesis and a mitochondrial uncoupler to enhance respiration synergistically drives neuroblastoma differentiation and inhibits proliferation.
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