光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2014年
6期
1688-1692
,共5页
咖啡%矿物质%咖啡因%草酸%光谱分析
咖啡%礦物質%咖啡因%草痠%光譜分析
가배%광물질%가배인%초산%광보분석
Coffee%Minerals%Caffeine%Oxalate%Spectroscopic analysis
应用光谱分析法测定现磨咖啡、速溶咖啡和菊苣咖啡的成分。通过电感耦合等离子体发射光谱（ICP-ES）测定咖啡样品的矿物质元素。分别采用紫外（UV）和傅里叶红外（FTIR）光谱法测定咖啡因和有机物的含量，草酸的测定需要采用氧化还原滴定法来完成。基于咖啡因、草酸和矿物质的测定，分析现磨咖啡、速溶咖啡和菊苣咖啡的差异。实验表明，咖啡因在速溶咖啡中的含量比现磨咖啡的要高出2～3倍；草酸在速溶咖啡中的含量明显高于现磨咖啡；矿物质元素Mg ，P ，Zn在现磨咖啡中的含量比速溶咖啡的要低，而Cu的含量则比速溶咖啡高出好几倍；菊苣咖啡中的矿物质含量总体上比速溶咖啡的要低。此外，我们在不同种类的咖啡中测定Ti 的含量，在菊苣咖啡中检测到Cu，Ti，Zn元素。作为一种快速检测技术，FTIR光谱可以用于鉴别现磨、速溶和菊苣咖啡，并能够检验咖啡因和草酸的存在。
應用光譜分析法測定現磨咖啡、速溶咖啡和菊苣咖啡的成分。通過電感耦閤等離子體髮射光譜（ICP-ES）測定咖啡樣品的礦物質元素。分彆採用紫外（UV）和傅裏葉紅外（FTIR）光譜法測定咖啡因和有機物的含量，草痠的測定需要採用氧化還原滴定法來完成。基于咖啡因、草痠和礦物質的測定，分析現磨咖啡、速溶咖啡和菊苣咖啡的差異。實驗錶明，咖啡因在速溶咖啡中的含量比現磨咖啡的要高齣2～3倍；草痠在速溶咖啡中的含量明顯高于現磨咖啡；礦物質元素Mg ，P ，Zn在現磨咖啡中的含量比速溶咖啡的要低，而Cu的含量則比速溶咖啡高齣好幾倍；菊苣咖啡中的礦物質含量總體上比速溶咖啡的要低。此外，我們在不同種類的咖啡中測定Ti 的含量，在菊苣咖啡中檢測到Cu，Ti，Zn元素。作為一種快速檢測技術，FTIR光譜可以用于鑒彆現磨、速溶和菊苣咖啡，併能夠檢驗咖啡因和草痠的存在。
응용광보분석법측정현마가배、속용가배화국거가배적성분。통과전감우합등리자체발사광보（ICP-ES）측정가배양품적광물질원소。분별채용자외（UV）화부리협홍외（FTIR）광보법측정가배인화유궤물적함량，초산적측정수요채용양화환원적정법래완성。기우가배인、초산화광물질적측정，분석현마가배、속용가배화국거가배적차이。실험표명，가배인재속용가배중적함량비현마가배적요고출2～3배；초산재속용가배중적함량명현고우현마가배；광물질원소Mg ，P ，Zn재현마가배중적함량비속용가배적요저，이Cu적함량칙비속용가배고출호궤배；국거가배중적광물질함량총체상비속용가배적요저。차외，아문재불동충류적가배중측정Ti 적함량，재국거가배중검측도Cu，Ti，Zn원소。작위일충쾌속검측기술，FTIR광보가이용우감별현마、속용화국거가배，병능구검험가배인화초산적존재。
Spectroscopic analysis was applied to the determination of the nutrient quality of ground,instant and chicory coffees. By using inductively coupled plasma atomic emission spectrometry (ICP-ES),nine mineral elements were determined in solid cof-fee samples.Caffeine was determined by ultraviolet (UV)spectrometry and organic matter was investigated by Fourier trans-form infrared (FTIR)spectroscopy.Oxidation-reduction titration was utilized for measuring the oxalate.The differences be-tween ground coffee and instant coffee was identified on the basis of the contents of caffeine,oxalate and mineral elements.Ex-perimental evidence showed that,caffeine in instant coffee was 2-3 times higher than in ground coffee.Oxalate in instant coffee was significantly higher in ground coffee.Mineral elements of Mg,P and Zn in ground coffee is lower than in instant coffee, while Cu is several times higher.The mineral content in chicory coffee is overall lower than the instant coffee.In addition,we determined the content of Ti for different types of coffees,and simultaneously detected the elements of Cu,Ti and Zn in chicory coffee.As a fast detection technique,FTIR spectroscopy has the potential of detecting the differences between ground coffee and instant coffee,and is able to verify the presence of caffeine and oxalate.
