RESUMO
UNLABELLED: A novel nano-packing material with lower relative humidity, oxygen transmission rate and high longitudinal strength was synthesized by blending polyethylene with nano-powder (nano-Ag, kaolin, anatase TiO(2), rutile TiO(2)), and its effect on preservation quality of strawberry fruits (Fragaria ananassa Duch. cv Fengxiang) was investigated during storage at 4 degrees C. Results showed that nano-packaging was able to maintain the sensory, physicochemical, and physiological quality of strawberry fruits at a higher level compared with the normal packing (polyethylene bags). After a 12-d storage, decreases in the contents of total soluble solids, titratable acidity, and ascorbic acid of nano-packing were significantly inhibited. Meanwhile, decay rate, anthocyanin, and malondialdehyde contents were decreased to 16.7%, 26.3 mg/100g, 66.3 micromol/g for nano-packing and 26.8%, 31.9 mg/100g, 75.4 micromol/g for normal packing; polyphenoloxidase (PPO) and pyrogallol peroxidase (POD) activities were significantly lower in nano-packing than the control. These data indicated that the nano-packaging might provide an attractive alternative to improve preservation quality of the strawberry fruits during extended storage. PRACTICAL APPLICATION: Nano-packing exhibited identified quality benefits applicable to the preservation of fresh strawberry. Furthermore, nano-packing has the advantages of simple processing and feasibility to be industrialized in contrast with other storages. Thus, the utilization of nano-packing will likely assist commercial producers and retailers in extending the shelf life of products over a broader range in the future.
Assuntos
Embalagem de Alimentos/métodos , Conservação de Alimentos/métodos , Fragaria , Frutas , Nanotecnologia/métodos , Antocianinas/análise , Ácido Ascórbico/análise , Catecol Oxidase/metabolismo , Temperatura Baixa , Manipulação de Alimentos/métodos , Microbiologia de Alimentos , Fragaria/química , Fragaria/enzimologia , Fragaria/microbiologia , Frutas/química , Frutas/enzimologia , Frutas/microbiologia , Fungos/crescimento & desenvolvimento , Concentração de Íons de Hidrogênio , Malondialdeído/análise , Nanopartículas Metálicas/química , Peroxidases/metabolismo , Polietilenos/síntese química , Polietilenos/química , Pirogalol/metabolismo , Controle de Qualidade , Fatores de TempoRESUMO
AIM: To investigate the pathophysiology of erythrocyte energy metabolic changes of patients with the traditional Chinese Medicine (TCM) liver-blood deficiency syndrome (LBDS). METHODS: Erythrocyte membrane ATPase activity and oxygen consumption rate (OCR) were determined in 66 patients with LBDS, including 35 patients with iron deficiency anemia and 31 patients with chronic aplastic anemia. Thirty healthy adults served as controls. RESULTS: ATPase activity and OCR were decreased in patients with LBDS. CONCLUSION: The decreased erythrocyte ATPase activity and OCR might cause the energy hypometabolism in LBDS patients.
