1.Comparative bioavailability ofβ-carotene from raw carrots and freshcarrot juice in humans: a crossover study
Mijoo CHOI ; Juha BAEK ; Eunju PARK
Nutrition Research and Practice 2025;19(2):215-224
BACKGROUND/OBJECTIVES:
Carrots are a major source of beta-carotene, but comparative studies on different consumption methods are limited. This study compared the rates of β-carotene absorption from fresh carrots versus fresh carrot juice.
SUBJECTS/METHODS:
For β-carotene absorption, a separate randomized controlled crossover trial was conducted with 16 healthy adults. The participants consumed 25 mg of β-carotene from raw carrots or fresh carrot juice. Blood samples were collected at the baseline (0 h) and at 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, and 24 h post-consumption.
RESULTS:
The carrot juice group exhibited 2.33 times higher peak plasma concentrations 1.5 h post-consumption than those in the raw carrot group. The area under the curve for β-carotene absorption was 2.09 times greater in the carrot juice group than in the raw carrot group. The plasma α-carotene levels increased in both groups, but no significant differences were found. Similarly, no significant changes in the plasma levels of other fat-soluble vitamins were observed. In addition, no significant differences in antioxidant capacity (oxygen radical absorbance capacity and total radical-trapping antioxidant potential) were found between the 2 groups.
CONCLUSION
Consuming fresh carrot juice, without added sugars, may enhance the bioavailability of β-carotene compared to raw produce.
2.Protective effect of maltol on pathological response of cardiomyocyte in dystrophic mice
Ahyoung LEE ; Hayeong KWON ; Seulmin KIM ; Yoonhee JEONG ; Byung Tae CHOI ; Changwon KHO
The Korean Journal of Physiology and Pharmacology 2025;29(2):235-244
Heart diseases are a significant contributor to global morbidity and mortality, and despite their diverse and complex mechanisms, treatment options remain limited. Maltol, a natural compound with antioxidant and anti-inflammatory activities, exhibits potential for addressing this need. This study evaluates the cardioprotective effects of maltol in isoproterenol (ISO)-induced cardiac stress models and Duchenne muscular dystrophy (DMD). Maltol’s cardiac cytotoxicity was assessed in rodent (H9c2) and human (AC16) cells and compared with that of dapagliflozin to illustrate its cardiac safety. In ISO-induced stress models, maltol significantly reduced hypertrophic markers and inflammation while enhancing autophagy and antioxidant pathways. In the mdx mice, a DMD model, maltol treatment improved cardiac contractility and reduced pathogenic remodeling. Enhanced phosphorylation of phospholamban and trends toward higher SERCA2a expression indicated enhanced Ca 2+ handling, which is crucial in DMD cardiomyopathy. This study demonstrated that maltol has the potential to provide therapeutic benefits for DMD and other cardiac conditions characterized by hypertrophy and inflammation, as evidenced by its well-known antioxidant properties, low cytotoxicity, and capacity to enhance cardiac function and Ca 2+ handling.
3.Antioxidant and immune-enhancing effects of Fuyu persimmons and Hachiya persimmons
Nayoung KIM ; Mijoo CHOI ; Jaeeun JUNG ; Gwanghwan AHN ; Eunju PARK
Journal of Nutrition and Health 2025;58(1):28-40
Purpose:
Persimmon (Diospyros kaki Thunb.) is rich in phytochemicals (e.g., tannin and beta-carotene.), vitamins (e.g., vitamins A and C), minerals (e.g., calcium and potassium), and dietary fiber. Persimmon exhibits efficacy against diseases such as cancer, hypertension, and heart disease. This study examined the antioxidant and immune-enhancing activities of Fuyu (a sweet persimmon) and Hachiya (an astringent persimmon) and evaluated their potential as functional food ingredients.
Methods:
The antioxidant and immune-enhancing activities of Fuyu and Hachiya persimmons were evaluated by extracting them with hot water and ethanol (100%). The antioxidant activity was assessed by measuring the total phenolic content (TPC), total flavonoid content (TFC), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity (RSA), and oxygen radical absorbance capacity (ORAC). Six-year domestic red ginseng was used as a reference for assessing the immune-enhancing activity. Nitric oxide (NO) production, phagocytosis, cytokine levels interleukin [IL]-2, IL-4, IL-10, and interferon-γ), and inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) gene expression were analyzed.
Results:
The hot water extracts of Fuyu and Hachiya persimmon exhibited significantly higher TPC, TFC, DPPH RSA, and ORAC levels than the ethanol extract. The Hachiya persimmon extract generally showed comparable or higher immune-enhancing activity than the Fuyu persimmon extract in NO production, cytokine activity, phagocytosis, and expression of iNOS and COX-2 genes.
Conclusion
Hachiya persimmon possesses superior antioxidant properties to Fuyu persimmon while exhibiting comparable immune-enhancing activity. These characteristics highlight its potential for beneficial applications. Nevertheless, further research is required to elucidate these effects and optimize their use in health-promoting interventions.
4.The Effect of Reality Shock on the Turnover Intention Among New Graduate Nurses: The Mediating Role of Social Support
Journal of Korean Clinical Nursing Research 2025;31(1):49-58
Purpose:
The study aimed to examine the mediating effects of social support on the relationship between reality shock and turnover intention among new graduate nurses.
Methods:
This study included 146 new graduate nurses working in hospitals located in state G. Data were collected from August 9, 2023 to January 15, 2024.Data was collected through a survey. For data analysis, SPSS/WIN 25.0 program was used. The data were identified with frequency and percentage, mean, standard deviation, independent t-test and one-way ANOVA, Scheffé test, Pearson’s correlation coefficient, and Baron and Kenny’s 3-stage procedures. The statistical significance of the mediating effects was verified using the PROCESS macro model 4.
Results:
Social support exhibited a negative correlation with reality shock (r=-.47, p<.001) and turnover intention (r=-.61, p<.001). Additionally, there was a positive correlation (r=.67, p<.001) between reality shock and turnover intention. Notably, social support had a partial mediating effect on the relationship between reality shock and turnover intention (β=.49, p<.001).
Conclusion
This study demonstrated that social support serves as a partial mediator in the relationship between reality shock and turnover intention among new graduate nurses.Consequently, it is recommended that efforts be made to improve social support through institutional and legal improvement and the development and implementation of programs aimed at reducing turnover intention among new graduate nurses.
5.The Effect of Reality Shock on the Turnover Intention Among New Graduate Nurses: The Mediating Role of Social Support
Journal of Korean Clinical Nursing Research 2025;31(1):49-58
Purpose:
The study aimed to examine the mediating effects of social support on the relationship between reality shock and turnover intention among new graduate nurses.
Methods:
This study included 146 new graduate nurses working in hospitals located in state G. Data were collected from August 9, 2023 to January 15, 2024.Data was collected through a survey. For data analysis, SPSS/WIN 25.0 program was used. The data were identified with frequency and percentage, mean, standard deviation, independent t-test and one-way ANOVA, Scheffé test, Pearson’s correlation coefficient, and Baron and Kenny’s 3-stage procedures. The statistical significance of the mediating effects was verified using the PROCESS macro model 4.
Results:
Social support exhibited a negative correlation with reality shock (r=-.47, p<.001) and turnover intention (r=-.61, p<.001). Additionally, there was a positive correlation (r=.67, p<.001) between reality shock and turnover intention. Notably, social support had a partial mediating effect on the relationship between reality shock and turnover intention (β=.49, p<.001).
Conclusion
This study demonstrated that social support serves as a partial mediator in the relationship between reality shock and turnover intention among new graduate nurses.Consequently, it is recommended that efforts be made to improve social support through institutional and legal improvement and the development and implementation of programs aimed at reducing turnover intention among new graduate nurses.
6.Comparative bioavailability ofβ-carotene from raw carrots and freshcarrot juice in humans: a crossover study
Mijoo CHOI ; Juha BAEK ; Eunju PARK
Nutrition Research and Practice 2025;19(2):215-224
BACKGROUND/OBJECTIVES:
Carrots are a major source of beta-carotene, but comparative studies on different consumption methods are limited. This study compared the rates of β-carotene absorption from fresh carrots versus fresh carrot juice.
SUBJECTS/METHODS:
For β-carotene absorption, a separate randomized controlled crossover trial was conducted with 16 healthy adults. The participants consumed 25 mg of β-carotene from raw carrots or fresh carrot juice. Blood samples were collected at the baseline (0 h) and at 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, and 24 h post-consumption.
RESULTS:
The carrot juice group exhibited 2.33 times higher peak plasma concentrations 1.5 h post-consumption than those in the raw carrot group. The area under the curve for β-carotene absorption was 2.09 times greater in the carrot juice group than in the raw carrot group. The plasma α-carotene levels increased in both groups, but no significant differences were found. Similarly, no significant changes in the plasma levels of other fat-soluble vitamins were observed. In addition, no significant differences in antioxidant capacity (oxygen radical absorbance capacity and total radical-trapping antioxidant potential) were found between the 2 groups.
CONCLUSION
Consuming fresh carrot juice, without added sugars, may enhance the bioavailability of β-carotene compared to raw produce.
7.Protective effect of maltol on pathological response of cardiomyocyte in dystrophic mice
Ahyoung LEE ; Hayeong KWON ; Seulmin KIM ; Yoonhee JEONG ; Byung Tae CHOI ; Changwon KHO
The Korean Journal of Physiology and Pharmacology 2025;29(2):235-244
Heart diseases are a significant contributor to global morbidity and mortality, and despite their diverse and complex mechanisms, treatment options remain limited. Maltol, a natural compound with antioxidant and anti-inflammatory activities, exhibits potential for addressing this need. This study evaluates the cardioprotective effects of maltol in isoproterenol (ISO)-induced cardiac stress models and Duchenne muscular dystrophy (DMD). Maltol’s cardiac cytotoxicity was assessed in rodent (H9c2) and human (AC16) cells and compared with that of dapagliflozin to illustrate its cardiac safety. In ISO-induced stress models, maltol significantly reduced hypertrophic markers and inflammation while enhancing autophagy and antioxidant pathways. In the mdx mice, a DMD model, maltol treatment improved cardiac contractility and reduced pathogenic remodeling. Enhanced phosphorylation of phospholamban and trends toward higher SERCA2a expression indicated enhanced Ca 2+ handling, which is crucial in DMD cardiomyopathy. This study demonstrated that maltol has the potential to provide therapeutic benefits for DMD and other cardiac conditions characterized by hypertrophy and inflammation, as evidenced by its well-known antioxidant properties, low cytotoxicity, and capacity to enhance cardiac function and Ca 2+ handling.
8.Comparative bioavailability ofβ-carotene from raw carrots and freshcarrot juice in humans: a crossover study
Mijoo CHOI ; Juha BAEK ; Eunju PARK
Nutrition Research and Practice 2025;19(2):215-224
BACKGROUND/OBJECTIVES:
Carrots are a major source of beta-carotene, but comparative studies on different consumption methods are limited. This study compared the rates of β-carotene absorption from fresh carrots versus fresh carrot juice.
SUBJECTS/METHODS:
For β-carotene absorption, a separate randomized controlled crossover trial was conducted with 16 healthy adults. The participants consumed 25 mg of β-carotene from raw carrots or fresh carrot juice. Blood samples were collected at the baseline (0 h) and at 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, and 24 h post-consumption.
RESULTS:
The carrot juice group exhibited 2.33 times higher peak plasma concentrations 1.5 h post-consumption than those in the raw carrot group. The area under the curve for β-carotene absorption was 2.09 times greater in the carrot juice group than in the raw carrot group. The plasma α-carotene levels increased in both groups, but no significant differences were found. Similarly, no significant changes in the plasma levels of other fat-soluble vitamins were observed. In addition, no significant differences in antioxidant capacity (oxygen radical absorbance capacity and total radical-trapping antioxidant potential) were found between the 2 groups.
CONCLUSION
Consuming fresh carrot juice, without added sugars, may enhance the bioavailability of β-carotene compared to raw produce.
9.Protective effect of maltol on pathological response of cardiomyocyte in dystrophic mice
Ahyoung LEE ; Hayeong KWON ; Seulmin KIM ; Yoonhee JEONG ; Byung Tae CHOI ; Changwon KHO
The Korean Journal of Physiology and Pharmacology 2025;29(2):235-244
Heart diseases are a significant contributor to global morbidity and mortality, and despite their diverse and complex mechanisms, treatment options remain limited. Maltol, a natural compound with antioxidant and anti-inflammatory activities, exhibits potential for addressing this need. This study evaluates the cardioprotective effects of maltol in isoproterenol (ISO)-induced cardiac stress models and Duchenne muscular dystrophy (DMD). Maltol’s cardiac cytotoxicity was assessed in rodent (H9c2) and human (AC16) cells and compared with that of dapagliflozin to illustrate its cardiac safety. In ISO-induced stress models, maltol significantly reduced hypertrophic markers and inflammation while enhancing autophagy and antioxidant pathways. In the mdx mice, a DMD model, maltol treatment improved cardiac contractility and reduced pathogenic remodeling. Enhanced phosphorylation of phospholamban and trends toward higher SERCA2a expression indicated enhanced Ca 2+ handling, which is crucial in DMD cardiomyopathy. This study demonstrated that maltol has the potential to provide therapeutic benefits for DMD and other cardiac conditions characterized by hypertrophy and inflammation, as evidenced by its well-known antioxidant properties, low cytotoxicity, and capacity to enhance cardiac function and Ca 2+ handling.
10.The Effect of Reality Shock on the Turnover Intention Among New Graduate Nurses: The Mediating Role of Social Support
Journal of Korean Clinical Nursing Research 2025;31(1):49-58
Purpose:
The study aimed to examine the mediating effects of social support on the relationship between reality shock and turnover intention among new graduate nurses.
Methods:
This study included 146 new graduate nurses working in hospitals located in state G. Data were collected from August 9, 2023 to January 15, 2024.Data was collected through a survey. For data analysis, SPSS/WIN 25.0 program was used. The data were identified with frequency and percentage, mean, standard deviation, independent t-test and one-way ANOVA, Scheffé test, Pearson’s correlation coefficient, and Baron and Kenny’s 3-stage procedures. The statistical significance of the mediating effects was verified using the PROCESS macro model 4.
Results:
Social support exhibited a negative correlation with reality shock (r=-.47, p<.001) and turnover intention (r=-.61, p<.001). Additionally, there was a positive correlation (r=.67, p<.001) between reality shock and turnover intention. Notably, social support had a partial mediating effect on the relationship between reality shock and turnover intention (β=.49, p<.001).
Conclusion
This study demonstrated that social support serves as a partial mediator in the relationship between reality shock and turnover intention among new graduate nurses.Consequently, it is recommended that efforts be made to improve social support through institutional and legal improvement and the development and implementation of programs aimed at reducing turnover intention among new graduate nurses.

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