BACKGROUND Hepatocellular carcinoma(HCC) is one of the most common malignant tumors worldwide, and novel methods for early/rapid diagnosis of HCC are needed.Terahertz(THz) spectroscopy is considered to have the potent...BACKGROUND Hepatocellular carcinoma(HCC) is one of the most common malignant tumors worldwide, and novel methods for early/rapid diagnosis of HCC are needed.Terahertz(THz) spectroscopy is considered to have the potential to distinguish between normal liver tissue and HCC tissue; however, there are few reports on it.We conduct this observational study to explore the feasibility of THz imaging for the diagnosis of HCC.AIM To evaluate the feasibility of THz for discriminating between HCC and normal liver tissues using fresh tissue specimens obtained from HCC patients who had undergone surgery.METHODS Normal liver tissue and HCC tissue were cryosectioned into 50 μm-thick slicesand placed on cover glass. Two adjacent tissue sections were separated subjected to histopathological examination by hematoxylin and eosin staining or THz transmission examination, and THz images were compared with pathologically mapped images. We determined the typical tumor and normal liver tissue regions by pathological examination; the corresponding areas of adjacent sections were examined by THz transmission.RESULTS The transmission rate of HCC tissue was 0.15-0.25, and the transmission rate of typical HCC tissue was about 0.2. THz transmittance in normal liver tissue is slightly higher than 0.4, but there were many influencing factors, including the degree of liver cirrhosis, fat components, ice crystals in frozen sections, and apoptosis.CONCLUSION In conclusion, this study shows that THz imaging can detect HCC tissue. Further research will yield more detailed data of the THz transmission rates of HCC tissue with different degrees of differentiation.展开更多
Objective:To make full usage of resource and turn waste into treasure,the chemical constituents and bioactivity were firstly investigated on Damask rose(Rosa damascena)flower residue(DRFR).Methods:DPPH and ABTS experi...Objective:To make full usage of resource and turn waste into treasure,the chemical constituents and bioactivity were firstly investigated on Damask rose(Rosa damascena)flower residue(DRFR).Methods:DPPH and ABTS experiments were applied to assess the antioxidant activity of DRFR.Then,column chromatography was used to purify compounds from an antioxidation extract(DRFR-A),and the chemical structure was identified using NMR.The total phenolic acid content was measured by FolinCiocalteu colorimetric method,and the content of gallic acid of the indicator ingredient was detected by HPLC.Results:DRFR-A was found to show a high activity both on DPPH(IC5o:2.760μg/mL)and ABTS(ICso:2.258μg/mL)compared to positive control Vc,Ten compounds were isolated and identified as quercetin(1),kaempferol(2),gallic acid(3),protocatechuic acid(4),pyrogallic acid(5),2-phenylethyl 3,4,5-trihydroxybenzoate(6),methyl gallate(7),p-hydroxybenzoic acid(8),p-hydroxyphenethyl alcohol(9)and astragalin(10)from DRFR-A.Among them,pyrogallic acid,2-phenylethyl-3,4,5-trihydroxybenzoate,p-hydroxybenzoic acid and p-hydroxyphenethyl alcohol are obtained from the plant for the first time.The content of total phenolic acids and gallic acid,main ingredient in DRFR-A was determined as 63.73%and 24.67%,respectively.Conclusion:This study provides a reliable data and lays the foundation for the development and utilization of rose residue,and hence for the full utilization of rose resources.展开更多
基金Supported by the National Natural Science Foundation of China,No.11622542 and No.51677145
文摘BACKGROUND Hepatocellular carcinoma(HCC) is one of the most common malignant tumors worldwide, and novel methods for early/rapid diagnosis of HCC are needed.Terahertz(THz) spectroscopy is considered to have the potential to distinguish between normal liver tissue and HCC tissue; however, there are few reports on it.We conduct this observational study to explore the feasibility of THz imaging for the diagnosis of HCC.AIM To evaluate the feasibility of THz for discriminating between HCC and normal liver tissues using fresh tissue specimens obtained from HCC patients who had undergone surgery.METHODS Normal liver tissue and HCC tissue were cryosectioned into 50 μm-thick slicesand placed on cover glass. Two adjacent tissue sections were separated subjected to histopathological examination by hematoxylin and eosin staining or THz transmission examination, and THz images were compared with pathologically mapped images. We determined the typical tumor and normal liver tissue regions by pathological examination; the corresponding areas of adjacent sections were examined by THz transmission.RESULTS The transmission rate of HCC tissue was 0.15-0.25, and the transmission rate of typical HCC tissue was about 0.2. THz transmittance in normal liver tissue is slightly higher than 0.4, but there were many influencing factors, including the degree of liver cirrhosis, fat components, ice crystals in frozen sections, and apoptosis.CONCLUSION In conclusion, this study shows that THz imaging can detect HCC tissue. Further research will yield more detailed data of the THz transmission rates of HCC tissue with different degrees of differentiation.
基金The authors wish to thank associate professor Cheng-xue Pan from Zheng-zhou University for his assistance in the plants identification and authentications.This project was supported financially by the National Natural Science Foundation of China(Grant No.331/313400531021).
文摘Objective:To make full usage of resource and turn waste into treasure,the chemical constituents and bioactivity were firstly investigated on Damask rose(Rosa damascena)flower residue(DRFR).Methods:DPPH and ABTS experiments were applied to assess the antioxidant activity of DRFR.Then,column chromatography was used to purify compounds from an antioxidation extract(DRFR-A),and the chemical structure was identified using NMR.The total phenolic acid content was measured by FolinCiocalteu colorimetric method,and the content of gallic acid of the indicator ingredient was detected by HPLC.Results:DRFR-A was found to show a high activity both on DPPH(IC5o:2.760μg/mL)and ABTS(ICso:2.258μg/mL)compared to positive control Vc,Ten compounds were isolated and identified as quercetin(1),kaempferol(2),gallic acid(3),protocatechuic acid(4),pyrogallic acid(5),2-phenylethyl 3,4,5-trihydroxybenzoate(6),methyl gallate(7),p-hydroxybenzoic acid(8),p-hydroxyphenethyl alcohol(9)and astragalin(10)from DRFR-A.Among them,pyrogallic acid,2-phenylethyl-3,4,5-trihydroxybenzoate,p-hydroxybenzoic acid and p-hydroxyphenethyl alcohol are obtained from the plant for the first time.The content of total phenolic acids and gallic acid,main ingredient in DRFR-A was determined as 63.73%and 24.67%,respectively.Conclusion:This study provides a reliable data and lays the foundation for the development and utilization of rose residue,and hence for the full utilization of rose resources.
