Synthesis and Spectrophotometric Analysis of Microcapsules Containing Immortelle Essential Oil

In this study, microcapsules were prepared by solvent evaporation technique using ethyl cellulose component as wall and essential oil as core material. The synthesis of microcapsules was carried out using different oil masses. The analysis of the microcapsules was carried out using field emission scanning electron microscope (FE-SEM) and UV spectrophotometric analysis using absorption spectrophotometer. The obtained results confirm the regular spherical shape and size of the synthesized microcapsules. The qualitative and quantitative spectrophotometric analysis of the microencapsulated immortelle oil was measured at the wavelength of 265 nm. The calibration diagram was used to calculate the unknown concentrations of the microencapsulated oil. The obtained results confirm the application of the presented method as relevant for the possible determination of microencapsulated oil on textile materials.     

精油化学的进展

本文粗略回顾了精油化学的新进展,对精油的研究方法、精油成分的合成及生源也有所论述。同时介绍了当前精油研究中常用的文献。     

Spectrophotometric Estimation of Nimesulide and its Formulations

 Four simple and sensitive visible spectrophotometric methods (A–D) have been described for the assay of nimesulide (NMD) either in pure form or in pharmaceutical formulations. Methods A and B are based on the oxidative coupling between the reduced product of NMD (RNMD) and p-N,N-dimethyl phenylenediamine dihydrochloride (DMPD) in presence of chloramine – T (CAT) or 3-methyl-2-benzothiazolinone hydrazone hydrochloride (MBTH) in presence of ferric chloride (Fe III) to form coloured products with λ_max at 540 nm and 600 nm respectively. Method C is based on the diazotization of RNMD with excess nitrous acid (HNO₂) and estimating the consumed HNO₂ with cresyl fast violet acetate (CFVA). Method D is based on the formation of the coloured charge-transfer complex, when RNMD is treated with metol (p-methyl aminophenol sulphate, PMAP) in presence of potassium dichromate. All variables have been optimized and the reaction sequence is presented. The concentration measurements are reproducible within a relative standard deviation of 1.0%. Recoveries are 98.6–100.2%. Received February 5, 1998. Revision February 20, 1999.     

Essential Oil Composition of Pavetta siamica

Chemistry of Natural Compounds -     

Spectrophotometric Estimation of Carbaryl Residue in Some Home Garden Vegetables

Abstract

Residues of carbaryl (1-Naphthyl N-methly carbamate) were determined in the fruit and foliage of seven home garden vegetables by a spectrophotometric method. Residues at harvest averaged the following levels; cabbage (head, 0.0 ppm), cucumber (foliage 0.0 ppm; fruit, 0.05 ppm), garden bush beans (fruit, 0.0 ppm), Okra (foliage, 0.0 ppm; fruit, 0.01 ppm), pepper (foliage, 2.72 ppm; fruit, 0.9 ppm), squash (foliage, 6.55 ppm; fruit, 0.0 ppm), and tomato (foliage, 2.07 ppm; green fruit, 0.09 ppm; mature fruit, 0.03 opm). Foliage of the vegetables contained higher concentrations of the insecticide, in most cases, than did the fruits. Even with excessive applications, the carbaryl residues were found to be below the tolerance level established by EPA.     

生姜挥发性成分的分析

本文采用水蒸气蒸馏法提取了生姜挥发性成分，并用GC／MS方法对提取的挥发性成分进行了鉴定。共鉴定了30种化学成分，并进行了讨论。     

佛手挥发油的化学成分

用色谱－质谱－计算机联用法对佛手挥发油的化学成分和相对含量进行了系统分析,得到６７种组分,鉴定出３１个组分,主要组分是柠檬烯（４８．４％）、１－甲基－２－（１－甲乙基）－苯（３０．８％）。     

Simultaneous Spectrophotometric Estimation of Rabeprazole Sodium and Itopride HCl

Abstract

Two simple, rapid, accurate, and economical analytical methods have been developed for the simultaneous estimation of Rabeprazole Sodium and Itopride Hydrochloride in combined capsule dosage form. First method is based on the determination of Q‐value and second method is based on simultaneous equation method. Rabeprazole Sodium has absorbance maxima at 284 nm and Itopride Hydrochloride has absorbance maxima at 258 nm in methanol AR. The absorption ratio (Q‐value) was determined at 266.6 nm (Iso‐bestic point) and 284 nm (λmax of Rabeprazole Sodium). Both the drugs obey Beer's law in the concentration ranges employed for these methods. Both the methods were found to be simple, rapid, accurate, and can be adopted in routine analysis of drugs in formulations. The accuracy and reproducibility of the proposed method was statistically validated by recovery studies     

Chemical Composition of Pentanema kurdistanicum Essential Oil

Chemistry of Natural Compounds -     

Spectrophotometric Method for the Estimation of Vitamin C in Drug Formulations

Abstract

The use of 1-chloro-2, 4-dinitrobenzene is described for spectrophotometric estimation of ascorbic acid. The procedure is based on the interaction of ascorbic acid with 1-chloro-2, 4-dinitrobenzene in alkaline medium. The product absorbs maximally at 380 nm and has the molar absorptivity 0.14 × 10⁴1 mole^?1cm^?1. Beer's law is obeyed in the concentration range 0.12–0.6 mg/10ml of ascorbic acid.     

阴行草中挥发油的分析

阴行草(SiphonostegiachinensisBenth.)系玄参科植物。全草地上部分入药,《中药志》编入刘寄奴条^[1],《中药大辞典》编入钤茵陈条^[2]。其药用功效和可制疗的疾病参见文献^[1.2]。有关阴行草的化学组分,中国医学科学院药物研究所曾指出含挥发油、强心甙等^[3],但具体组分,目前尚未见报导。本文报导了空心柱气相色谱-质谱法对阴行草挥发油的分离和鉴定结果,共鉴定了35个组分,占总油含量(按总离子流图面积归一法人工估算)的92.5％,相对含量在1％以上的16个主要组分全部鉴定。