Development and effectiveness of greenhouse type solar dryer for coriander leaves

Aim: Sun drying system is not able to provide the best drying performance and quality dried produce of leafy vegetables. To facilitate better options to the farmers, this study aims to develop and evaluate a cost-effective greenhouse type solar dryer to improve shelf stability of coriander leaves. Methodology: A greenhouse type solar dryer (5m x 3m x 2.3m) was developed with the provision of rigid frame, 200 µ UV stabilized LDPE glazing material, solar collector cum drying chamber, inlet air and outlet air openings. The dryer was evaluated for its performance, drying characteristics of coriander leaves and qualitative evaluation of dried product as compared to open sun drying. Results: The greenhouse type solar dryer performed well for coriander drying with increased level of temperature inside the dryer (42oC) and 24% reduced drying time as compared to sun drying (29oC).The loading capacity, efficiency, payback period and B:C ratio of the dryer were found to be 100 kg, 70.47 %, 1.26 yr and 1.79, respectively. The drying of coriander leaves occured mostly in falling rate period. Coriander leaves dried under the dryer possessed higher values of chlorophyll content (1.356 mg g-1 of tissue), ascorbic acid content (111.257 mg 100g-1), rehydration ratio (5.302) and coefficient of rehydration (0.762) than sun dried coriander leaves with the respective values of these quality parameters being 1.097 mg g-1 of tissue, 62.37 mg 100g-1, 4.715 and 0.689, respectively.

Drying characteristics and prediction of best fitted drying model for coriander leaves

Drying experiments were conducted on coriander leaves as affected by drying methods (solar greenhouse drying and open sun drying), pretreatments (dipping in a solution of magnesium chloride + sodium bicarbonate + potassium metabisulphite, boiled water blanching containing sodium metabisulphite, and untreated), and loading densities (2.0, 2.5 and 3.0 kg/m2). Validity of three commonly used drying models were examined to predict the most suitable drying model for coriander leaves. The increased drying temperature under solar greenhouse dryer (42°C) increases the amount of moisture removal from the coriander leaves and reduces the drying time by increasing the drying rate as compared to open sun drying (29°C), at all the selected levels of pretreatments and loading densities. Chemically treated coriander leaves dehydrated under a solar greenhouse dryer required less drying time than other treated leaves and dried leaves. Nevertheless, drying methods and loading densities had significant effects, while treatment effects were marginal. It was found that reduction of moisture and moisture removal rate per unit time occurred mostly in the falling rate period except some accelerated removal of moisture at the beginning up to 150 minutes. Page's model was found most appropriate for drying coriander leaves among the selected models.

Penggunaan daun ketumbar (coriandrum sativum L.) sebagai penjernih air di Desa Meka Praya Tengah

Water is the principal human needs. Utilization in all life aspect. However water availability in every area is different. Meka Village with location in Central Praya Distric Central Lombok usually deficiency of clean water in dry season. Public make use of surface water to fulfill needs. This community dedication aim at give society way to process and use coriander leaves as ingredient water clarifier. Coriander leaves have absorbs ability to solute in the water and have antioxsidants coumpound. This proven that application coriander leaves able to lowered water temperature amounting to 3,4 ℃ and ph amounting to 5,4. Based on these research could concluded that coriander leaves able to clarifier water because have nature to absorbs solute in the water and also contain antioxidants compound

Anti-Inflammatory Activity of Oxycarotenoid Extracts Isolated from Coriander Leaves (Coriandrum Sativum) and Curry Leaves (Murraya koenigii) on Carrageenan Induced Acute Inflammation in Rats

Introduction: Green leafy vegetables are important sources of polyphenols and carotenoids which possess both antioxidant and anti-inflammatory activities. Aim: To study the anti-inflammatory activity of oxycarotenoid extracts isolated from coriander leaves (Coriandrumsativum) and curry leaves (Murraya koenigii) in carrageenan induced acute paw oedema in rats. Materials and Methods: Oxycarotenoid extracts were isolated from the coriander leaves (Coriandrum sativum) and curry leaves (Murraya koenigii) and they were assessed for anti-inflammatory activities by in-vivo methods. The in-vivo anti-inflammatory activity was evaluated in carrageenan induced acute paw oedema model. Indomethacin at a dose of 20 mg/Kg body weight was used as standard anti-inflammatory drug. Results: The results revealed that oxycarotenoids extracted from coriander leaves administered at a dose of 40 mg/kg body weight showed an inhibition of 53.33% whereas the oxycarotenoids extracted from curry leaves showed an inhibition of 60% at the sixth hour after carrageenan injection. The results are comparable with those of indomethacin (20 mg/Kg body weight) administered group which showed an inhibition of 55.53% Conclusion: These findings suggest that oxycarotenoid extracts isolated from leafy vegetables (coriander leaves and curry leaves) have significant anti-inflammatory activities.

Quantification of phytochemical constituents in sixteen commonly consumed green leafy vegetables

Sixteen green leafy vegetables - curry leaves (Murraya koenigii), fenugreek (methi) leaves (Trigonella foenum-graecum), coriander leaves (Coriandrum sativum), broccoli leaves (Brassica oleracea), bay leaves (Laurus nobilis), oregano leaves (Origanum vulgare), marjoram leaves (Origanum majorana), basil leaves (Ocimum basilicum), pandan leaves (Pandanus amaryllifolius), sage leaves (Salvia officinalis), thyme leaves (Thymus vulgaris), lemon grass leaves (Cymbopogon citratus), kaffirlime leaves (Citrus hystrix) and parsley leaves (Petroselinum crispum) were collected and analysed for the determination of major phytochemicals (polyphenols, flavonoids, chlorophills and xanthophylls). Basil leaves, sage leaves and oregano leaves were found to be rich in total polyphenols., basil leaves, mint leaves and thyme leaves were rich in flavonoids., coriander leaves, mint leaves and spinach leaves were rich in chlorophills., and coriander leaves, curry leaves and fenugreek leaves were found to be rich xanthophylls (carotenoids). This information will pave the way for selecting specific vegetables for the isolation and characterisation of individual phytochemical and its application in studying antimutagenic, anti-inflammatory and anticancer activities.

Anti-mutagenic Activity of Oxycarotenoid-rich Extracts Isolated from Coriandrum Sativum and Murraya koenigii

Introduction: Edible and medicinal plants contain active principles that can act as antimutagens, and hence their intake may be useful for human cancer prevention. Green leafy vegetables are important sources of carotenoids which possess antioxidant, anti-inflammatory and antimutagenic properties. Objective: To study the antimutagenic activity of oxycarotenoid-rich extracts isolated from Coriandrum sativum (coriander leaves) and Murraya koenigii (curry leaves). Methods: Oxycarotenoid-rich extracts isolated from Coriandrum sativum (coriander leaves) and Murraya koenigii (curry leaves) were investigated for antimutagenic activity in vitro by Ames test using Salmonella typhimurium strains TA 98 and TA 1535. Mutagens used were, nitro-o- phenylenediamine (NPD) (20μg/plate) and N-methyl- N-nitro-N-nitrosoguanidine (MNNG) (1μg/ plate). Results: The results revealed that oxycarotenoid-rich extracts isolated from Coriandrum sativum (coriander leaves) and Murraya koenigii (curry leaves) administered at doses of 1.0 mg, 2.5 mg and 5 mg per plate significantly inhibited mutagenicity induced by NPD and MNNG.Conclusion: These findings suggest that oxycarotenoid- rich extracts isolated from Coriandrum sativum (coriander leaves) and Murraya koenigii (curry leaves) have antimutagenic properties.