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Detection of apple firmness with a novel loudspeaker-based excitation device

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International Journal of agricultural and Biological Engineering 2022年第1期15卷 260-266页

作者： Chengqiao Ding Dachen Wang Zhe Feng Di Cui College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China key laboratory of On site processing equipment for agricultural products Ministry of Agriculture and Rural AffairsHangzhou 310058China

Firmness is one of the important indices to evaluate the internal quality of *** this study,a noncontact loudspeaker-based detection system was developed to evaluate apple *** structural parameters of the excitation device were modified in the single-factor experiments,and the best combination of structural parameters was that the inner diameter of the gasket was 40 mm;the distance between fruit surface and loudspeaker was 95 ***,the proper posture style was that the apple was placed with its stem *** the modification of the Laser Doppler Vibrometer(LDV)method,the vibration response signals of 48 apples were measured to establish the firmness prediction *** results showed that the better prediction performance of stiffness was obtained in multiple *** Back Propagation Neural Network(BPNN)model had the best prediction performance by using parameters of elasticity index(EI),the peak value at the second resonance frequency f_(2)(A_(2)),and peak area S,with a correlation coefficient of prediction(r_(p))of 0.914;root mean square error of prediction(RMSEP)of 0.491 N/***,the proposed detection system is feasible to nondestructively detect apple firmness,which has the potential to be applied in online detection.

关键词： fruit firmness excitation device structural parameters vibration parameters

Low-temperature combined with high-humidity thawing improves the water-holding capacity and biochemical properties of Portunus trituberculatus protein

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Food Quality and Safety 2021年第2期5卷 152-160页

作者： Jiangang Ling Xiaoting Xuan Zihan Xu Tian Ding Xudong Lin Yan Cui Donghong Liu College of Biosystems Engineering and Food Science National-Local Joint Engineering Laboratory of Intelligent Food Technology and EquipmentZhejiang UniversityHangzhouChina institute of agricultural products processing Key Laboratory of Preservation Engineering of Agricultural ProductsNingbo Academy of Agricultural SciencesNingboChina College of Food Shenyang Agricultural UniversityShenyangChina

This study compared the effects of conventional thawing methods(water immersion thawing(WIT,(25±1)℃),natural air thawing(AT,(25±1)℃,relative humidity(RH(65±2)per cent),refrigerator thawing(RT,4℃,RH(80±2)per cent)and low-temperature(LT)combined with high-humidity thawing LT,-1℃to 1℃(LT-1-1),2-4℃(LT2-4),5-7℃(LT5-7)and 8-10℃(LT8-10),RH>95 per cent)on the water-holding capacity,lipid oxidation and biochemical properties of Portunus trituberculatus(***)myofibrillar *** results showed that WIT and AT significantly decreased the water-holding capacity while dramatically increasing lipid oxidation,protein oxidation and degeneration,resulting in serious *** quality *** humidity was beneficial for ***\.ha\A/\*** thawing time of *** under the conditions of LT2-4 was only 39.39 per cent of that of conventional air thawing at 4℃(RT),and the LT2-4 samples not only maintained better water-holding capacity but also had an obviously reduced degree of lipid oxidation,protein oxidation and *** samples LT2-4 and LT5-7 provided better maintenance of *** quality than the LT-1-1 and LT8-10 *** best quality was exhibited after thawing at 2-4℃.The levels of thiobarbituric acid reacting substances,carbonyl content and surface hydrophobicity observably decreased in these samples,while the total sulfhydryl contents dramatically increased compared to those of conventionally thawed samples,indicating lower lipid oxidation and protein ***,the Ca2+-ATPase activity of the sample thawed at 2-4℃(2.06 μmol Pi/mg prot/h)was markedly higher than that of samples subjected to WIT and *** product qualities observed after thawing at-1℃to 1℃,5-7℃and 8-10℃under LT were comparable to that observed by *** its thawing efficiency and product quality,LT is a suitable method for the thawing of ***,and the ideal thawing conditions were LT at 2-4℃.

关键词： Portunus trituberculatus-,thawing low temperature combined with high humidity water-holding capacity lipid oxidation biochemical properties of myofibrillar protein

Modeling method for SSC prediction in pomelo using Vis-NIRS with wavelength selection and latent variable updating

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International Journal of agricultural and Biological Engineering 2024年第1期17卷 251-260页

作者： Hao Tian Shuai Wang Huirong Xu Yibin Ying College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China key laboratory of on-site processing equipment for agricultural products Ministry of Agriculture and Rural AffairsHangzhou 310058China College of Food Science Shihezi UniversityShihezi 832003XinjiangChina

The aim of this study was in-line,rapid,and non-destructive detection for soluble solid content(SSC)in pomelos using visible and near-infrared spectroscopy(Vis-NIRS).However,the large size and thick rind of pomelo affect the stability of spectral acquisition and the biological variabilities affect the robustness of *** these issues,in this study,an efficient prototype in-line detection system in transmittance mode was designed and evaluated in comparison with an off-line detection *** from the years 2019 and 2020 were used for modeling and the external validation data were obtained by the inline detection system in *** wavelength selection methods of changeable size moving window(CSMW),random frog(RF),and competitive adaptive reweighted sampling(CARS)were used to improve the prediction accuracy of partial least squares regression(PLSR)*** best performance of internal prediction was obtained by CARS-PLSR and the determination coefficient of prediction(),root mean square error of prediction(RMSEP),and residual predictive deviation(RPD)were 0.958,0.204%,and 4.821,***,all models obtained large prediction biases in external *** latent variable updating(LVU)method was proposed to update models and improve the performance in external *** samples from the external validation set were randomly selected to update the *** with the recalibration method,LVU could effectively modify the original models which matched the SSC range of the external validation *** CSMW-PLSR models were more robust in external *** off-line model with LVU performed best with a root mean square error of validation(RMSEV)of 0.599%and the in-line model with recalibration obtained RMSEV of 0.864%.These results demonstrated the application potential of the transmittance Vis-NIRS for in-line rapid prediction of SSC in pomelos and the modeling and updating methods could be applied to samples with biological variabi

关键词： Vis-NIRS in-line detection external validation wavelength selection model updating pomelo SSC

An anti-passivation ink for the preparation of electrodes for use in electrochemical immunoassays

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2018年第9期19卷 726-734页

作者： Qi-qi ZHENG Yuan-chao LU Zun-zhong YE Jian-feng PING Jian WU Yi-bin YING College of Biosystems Engineering and Food Science Zhejiang University key laboratory of on site processing equipment for agricultural products Ministry of Agriculture Faculty of agricultural and Food Science Zhejiang A&F University

p-Nitrophenylphosphate （PNPP） is usually employed as the substrate for enzyme-linked immunosorbent assays, p-Nitrophenol （PNP）, the product of PNPP, with the catalyst alkaline phosphatase （ALP）, will passivate an electrode, which limits applications in electrochemical analysis. A novel anti-passivation ink used in the preparation of a graphene/ionic liquid/chitosan composited （rGO/IL/Ghi） electrode is proposed to solve the problem. The anti-passivation electrode was fabricated by directly writing the graphene-ionic liquid-chitosan composite on a single-side conductive gold strip. A glassy carbon electrode, a screen-printed electrode, and a graphene-chitosan composite-modified screen-printed electrode were investigated for comparison. Scanning electron microscopy was used to characterize the surface structure of the four different electrodes and cyclic voltammetry was carried out to compare their performance. The results showed that the rGO/IL/Ghi electrode had the best performance according to its low peak potential and large peak current. Amperometdc responses of the different electrodes to PNP proved that only the rGO/IL/Chi electrode was capable of anti-passivation. The detection of cardiac troponin I was used as a test example for electrochemical immunoassay. Differential pulse voltammetry was performed to detect cardiac troponin I and obtain a calibration curve. The limit of detection was 0.05 ng/ml.

关键词： Electrochemical immunoassay Electrode ink Anti-passivation Ionic liquid p-Nitrophenol

Effects of Milling Methods on Rice Flour Properties and Rice Product Quality:A Review

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Rice science 2024年第1期31卷 33-46页

作者： TIAN Yu SUN Jing LI Jiaxin WANG Aixia NIE Mengzi GONG Xue WANG Lili LIU Liya WANG Fengzhong TONG Litao Institute of Food Science and Technology/Western Research Institute Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products ProcessingMinistry of Agriculture and Rural AffairsBeijing 100193China

High-quality rice flour is the foundation for the production of various rice-based *** is an essential step in obtaining rice flour,during which significant changes occur in the physicochemical and quality characteristics of the *** rice flour obtained through mainstream wet milling methods exhibits superior quality,low production efficiency and wastewater discharge limit the development of the *** milling,on the other hand,conserves water resources,but adversely affects flour performance due to excessive heat *** an emerging powder-making technique,semi-dry milling offers a promising solution by enhancing flour quality and reducing environmental *** is achieved by minimizing soaking time through hot air treatment while reducing mechanical energy consumption to reach saturated water absorption ***,continuous production remains a *** comprehensive review summarizes the effects of various milling technologies on rice flour properties and product *** also discusses key control indicators and technical considerations for rice flour processing equipment and processes.

关键词： flour property milling equipment milling method rice flour rice product quality semi-dry milling

Universal probe with oriented antibody to improve the immunochromatographic assay of lead ions in Procambarus clarkii

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Food Quality and Safety 2023年第2期7卷 309-316页

作者：李杨阳朱正伟曲文莉杨庆刘言王桥段烁伍金娥宫智勇许琳 College of Food Science and Engineering Wuhan Polytechnic UniversityWuhanChina Hubei Provincial Institute for Food Supervision and Test WuhanChina key laboratory for Deep processing of Major Grain and Oil Ministry of EducationWuhanChina Hubei key laboratory for processing and Transformation of agricultural products WuhanChina Food Safety Research Center Key Research Instituteof Humanities and Social Sciences of Hubei ProvinceWuhanChina

Objectives:Based on the information from the random inspection of foods by the China Food and Drug Administration in 2022,the contamin-ation levels of lead ions are high in many edible *** methods of detecting lead ions cannot meet the requirements of on-site analysis of food due to the need for large *** immunochromatographic assay(iCA)is an effective,rapid,on-site analytical technique for determining lead ions in ***,the performance of ICA based on the traditional probe(AuNP-mAb)is limited by ignoring the influ-ence of theantibody *** and Methods:In this study,we developed an efficient technology for constructing a universal probe(AuNP-PrA-mAb)based on the oriented immobilization of *** performance of ICA was largely improved due to specific binding of the Fc region of the antibody with recombinant protein A(PrA)on the surface of a gold nanoparticle(AuNP).The ICA based on a universal probe was applied for the qualitative and quantitative detection of lead ions in Procambarus clarki within 30 ***,a simple and fast pretreatment method based on dilute acid extraction was developed forpretreating thePclarkii containing ***:The visual limit of detection and the scanning limit of quantization of the developed iCA strip for lead ions were O.5 ng/mL and 0.28 ng/mL,*** sensitivity of ICA based on universal probe was 10-fold higher than that of the ICA using traditional ***,the detection results had no obvious difference between the ICA and ICP-MS with t-test statistical ***:The developed ICA based on a universal probe presented broad application prospects in detecting contaminants in foods.

关键词： Oriented antibody universal probe immunochromatographic assay dilute acid extraction lead ions

Plant-based meat substitutes by high-moisture extrusion:Visualizing the whole process in data systematically from raw material to the products

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Journal of Integrative Agriculture 2022年第8期21卷 2435-2444页

作者： ZHANG Jin-chuang MENG Zhen CHENG Qiong-ling LI Qi-zhai ZHANG Yu-jie LIU Li SHI Ai-min WANG Qiang Institute of Food Science and Technology Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products ProcessingMinistry of Agriculture and Rural AffairsBeijing 100193P.R.China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190P.R.China

High-moisture extrusion technology should be considered one of the best choices for producing plant-based meat substitutes with the rich fibrous structure offered by real animal meat ***,the extrusion process has been seen as a“black box”with limited information about what occurs inside,causing serious obstacles in developing meat *** study designed a high-moisture extrusion process and developed 10 new plant-based meat substitutes comparable to the fibrous structure of real animal *** study used the Feature-Augmented Principal Component Analysis(FA-PCA)method to visualize and understand the whole extrusion process in three ways systematically and *** established six sets of mathematical models of the high-moisture extrusion process based on 8000 pieces of data,including five types of *** FA-PCA method improved the R^(2) values significantly compared with the PCA *** Way 3 was the best to predict product quality(Z),demonstrating that the gradually molecular conformational changes(Y^(n'))were critical in controlling the final quality of the plant-based meat ***,the first visualization platform software for the high-moisture extrusion process has been established to clearly show the“black box”by combining the virtual simulation *** the software,some practice work such as equipment installation,parameter adjustment,equipment disassembly,and data prediction can be easily achieved.

关键词： plant-based meat substitutes high-moisture extrusion process extrusion parameters models visualization platform software

Effects of dietary glycerol monolaurate on productive performance, egg quality, serum biochemical indices, and intestinal morphology of laying hens

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2019年第11期20卷 877-890页

作者： Min-jie ZHAO Hai-ying CAI Meng-yun LIU Ling-li DENG Yang LI Hui ZHANG Feng-qin FENG College of Biosystems Engineering and Food Science National Engineering Laboratory of Intelligent Food Technology and EquipmentKey Laboratory for Agro-Products Postharvest Handling of Ministry ofAgricultureKey Laboratory for Agro-Products Nutritional Evaluation of Ministry of AgricultureZhejiang Key Laboratory for Agro-Food ProcessingZhejiang UniversityHangzhou 310058China Zhejiang key Lab for Chem&Bio processing Technology of Farm Product Zhejiang University of Science and TechnologyHangzhou 310023China

Glycerol mono laurate(GML)has been widely used as an effective antibacterial emulsifier in the food in?dustry.A total of 360 44-week-old Hy-Line brown laying hens were randomly distributed into four groups each with six replicates of 15 birds,and fed with com-soybean-meal-based diets supplemented with 0,0.15,0.30,and 0.45 g/kg GML,*** results showed that 0.15,0.30,and 0.45 g/kg GML treatments significantly decreased feed conversion ratios(FCRs)by 2.65%,7.08%,and 3.54%,respectively,and significantly increased the laying rates and average egg *** egg quality,GML drastically in creased albume n height and Haugh units,and enhanced yolk ***,GML increased the concentrations of polyunsaturated and monounsaturated fatty acids and reduced the concentration of total saturated fatty acids in the *** albumen composition was also significantly modified,with an increase of 1.02%in total protein content,and increased 8ntents of His(4.55%)and Glu(2.02%)under the 0.30 g/kg GML ***,GML treatments had positive effects on the lipid metabolism of laying hens,including lowering the serum triglyceride and total cholesterol levels and reducing fat deposit!on in abdominal adipose *** morphology was also improved by GML treatment,with increased villus length and villus height to crypt depth *** data demonstrated that GML supplementation of laying hens could have beneficial effects on both their productivity and physiological properties,which indicates the potential application of GML as a functional feed additive and gives us a new in sight into this traditional food additive.

关键词： Glycerol monolaurate (GML) Laying hen Productive performance Egg quality Lipid metabolism

Low-cost portable dielectric spectrometer based on mini-vector network analyzer and open-ended coaxial probe technology

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International Journal of agricultural and Biological Engineering 2024年第3期17卷 166-172页

作者： Zhuozhuo Zhu Xinhua Zhu Wenchuan Guo College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiChina School of Physics and Electronic Information Yan'an UniversityYan'an 716000ShaanxiChina Shaanxi Research Center of agricultural equipment Engineering Technology Yangling 712100ShaanxiChina key laboratory of agricultural Internet of Things Ministry of Agriculture and Rural AffairsYangling 712100ShaanxiChina Shaanxi key laboratory of agricultural Information Perception and Intelligent Service Yangling 712100ShaanxiChina

As a simple,fast,and non-destructive measuring technology,dielectric spectroscopy is usually used to analyze the dielectric properties of agricultural products and food,and then to predict the main components of ***,the large and expensive vector network analyzers(VNA)with expensive analysis software applied in measuring dielectric properties make research limited to the *** acquire dielectric spectra in situ,a model for solving relative complex permittivity was derived,and its performance was ***,a low-cost portable dielectric spectrometer with a mini VNA,a Raspberry Pi,and a coaxial probe as core parts was developed over the frequency range of 100-3000 *** stability and accuracy of the developed spectrometer were tested using milk and *** results indicated that the relative errors of the model were within±5%for dielectric constant(ε′)and loss factor(ε″).The coefficients of variation of measuredε′andε″by the developed spectrometer at 100-3000 MHz were less than 1%and 2%,*** with the dielectric properties obtained by using a commercial dielectric measurement system,the relative errors of measuredε′andε″were within±3.4%and±6.0%,*** study makes fast,non-destructive,and on-site food quality detection using dielectric spectra possible.

关键词： coaxial probe mini vector network analyzer low-cost portable dielectric spectrometer