A novel microneedle patch indicator was developed to address the limitations of current colorimetric micro-needle patches for food testing,specifically the insufficient color sensitivity and safety concerns associated...A novel microneedle patch indicator was developed to address the limitations of current colorimetric micro-needle patches for food testing,specifically the insufficient color sensitivity and safety concerns associated with coloring agents.This indicator consists of a methyl acrylate-modified silk protein(SilMA)-gelatin(Gel)matrix incorporating blueberry anthocyanin(BA)and tannic acid(TA).By adjusting the concentrations of SilMA and photoinitiator,microneedle patches with enhanced mechanical properties were fabricated.Co-pigmentation of BA with varying concentrations of TA imparted the patch with sensitivity to both pH and amines.Antioxidant activity progressively increased with higher TA concentrations,while extraction efficiency initially improved before declining.Moreover,the color stability of the patch was significantly enhanced.When employed for pork freshness assessment,the microneedle patch exhibited a distinct color transition:from bright red(indicating freshness)to orange(indicating reduced quality),and ultimately to gray(indicating spoilage).This color change allows consumers to visually evaluate the degree of meat deterioration.展开更多
Petal coloration and pigment components in 12 American crape myrtle cultivars （Lagerstroemia indica x Lagerstroemia fauriei） and five Chinese crape myrtle cuItivars （L. indica hybrids） were studied. Color was meas...Petal coloration and pigment components in 12 American crape myrtle cultivars （Lagerstroemia indica x Lagerstroemia fauriei） and five Chinese crape myrtle cuItivars （L. indica hybrids） were studied. Color was measured by CIEL^＊a^＊b^＊ scale and anthocyanin composition of crape myrtle was determined using high-performance liquid chromatography coupled to photodiode array detection and electrospray ionization mass spectrometry. The presence of the previously reported delphinidin 3-O-glucoside, petunidin 3-O-glucoside and malvidin 3-O-glucoside were confirmed. Cyanidin 3-O-glucoside was identified in crape myrtle for the first time. We explored the relationship between petal color and anthocyanin contents by multiple linear regression analyses. The results indicated that total fiavones and fiavonols were important variables and contributed to blue-enhancing in crape myrtle. Based on anthocyanins and co-pigments analysis, flower color breeding in crape myrtle towards true-red and blue were discussed.展开更多
基金financially supported by National Key R&D Program of China(NO.2018YFC1603300).
文摘A novel microneedle patch indicator was developed to address the limitations of current colorimetric micro-needle patches for food testing,specifically the insufficient color sensitivity and safety concerns associated with coloring agents.This indicator consists of a methyl acrylate-modified silk protein(SilMA)-gelatin(Gel)matrix incorporating blueberry anthocyanin(BA)and tannic acid(TA).By adjusting the concentrations of SilMA and photoinitiator,microneedle patches with enhanced mechanical properties were fabricated.Co-pigmentation of BA with varying concentrations of TA imparted the patch with sensitivity to both pH and amines.Antioxidant activity progressively increased with higher TA concentrations,while extraction efficiency initially improved before declining.Moreover,the color stability of the patch was significantly enhanced.When employed for pork freshness assessment,the microneedle patch exhibited a distinct color transition:from bright red(indicating freshness)to orange(indicating reduced quality),and ultimately to gray(indicating spoilage).This color change allows consumers to visually evaluate the degree of meat deterioration.
基金the Scientific Research Foundation for Returned OverseasChinese Scholars from Ministry of Education of China ((2005)383).
文摘Petal coloration and pigment components in 12 American crape myrtle cultivars （Lagerstroemia indica x Lagerstroemia fauriei） and five Chinese crape myrtle cuItivars （L. indica hybrids） were studied. Color was measured by CIEL^＊a^＊b^＊ scale and anthocyanin composition of crape myrtle was determined using high-performance liquid chromatography coupled to photodiode array detection and electrospray ionization mass spectrometry. The presence of the previously reported delphinidin 3-O-glucoside, petunidin 3-O-glucoside and malvidin 3-O-glucoside were confirmed. Cyanidin 3-O-glucoside was identified in crape myrtle for the first time. We explored the relationship between petal color and anthocyanin contents by multiple linear regression analyses. The results indicated that total fiavones and fiavonols were important variables and contributed to blue-enhancing in crape myrtle. Based on anthocyanins and co-pigments analysis, flower color breeding in crape myrtle towards true-red and blue were discussed.
