Moisture dependant physical and uniaxial compression properties of black pepper

Murthy, C.T.; Bhattacharya, Suvendu

doi:10.1016/s0260-8774(98)00083-1

Cited by 46 publications

(42 citation statements)

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“…The decrease in rupture force and energy absorbed may be attributed to the fact that the inner core of seed becomes markedly softer and requires less force at higher moisture content, whereas at the lower moisture content, only outer coat of seed absorbs moisture and requires higher force. Similar results were reported for black pepper seed (Murthy and Bhattacharya, 1998) and wheat kernel (Dziki et al, 2010 …”

Section: Resultssupporting

confidence: 88%

“…It was found that the geometric mean diameter was lower than the major axis. Sphericity of coriander seeds was much lower than the reported values of spherical shaped black pepper and okra seeds, and higher than for locust and faba bean seeds (Murthy and Bhattacharya, 1998 (Tavakoli et al, 2009) and for laurel seeds (Yurtlu et al, 2010). Bulk density of coriander seeds decreased linearly from 291.89 to 288.66 kg m -3 with the increase in moisture content; on the other hand, the true density initially decreased nonlinearly from 806.76 to 789.87 kg m -3 in the moisture content from 3.5 to 9.8% d.b.…”

Section: Resultsmentioning

confidence: 78%

“…Those properties are useful in postharvest unit operations for the design of cleaning, grading, sorting, transportation, handling, aeration, sizing, storing, size reduction, packaging and other processing equipment (Sahay and Singh, 2001). Several investigators have reported the moisture dependence of physical and mechanical properties of chosen agricultural materials ie for black pepper (Murthy and Bhattacharya, 1998), fenugreek (Altuntas et al, 2005); fruit and kernel (Sahoo et al, 2009); rapeseed (Izli et al, 2009); bay laurel seeds (Yurtlu et al, 2010); lentil seed (Bagherpour et al, 2010). Chang (1988) determined the density and porosity of grain kernels using a gas pycnometer.…”

Section: Introductionmentioning

confidence: 99%

“…For experimentation, a predetermined quantity of coriander was dried in a tray dryer at 55°C to achieve a desired low moisture content level. To achieve high moisture contents, calculated amount of water was added and mixed thoroughly (Murthy and Bhattacharya, 1998). Samples were packed in low density polyethylene (LDPE) pouches and kept at 5°C for 48 h in a refrigerator for uniform distribution of moisture throughout the seed.…”

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confidence: 99%

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Physical properties of coriander seeds at different moisture content

Balasubramanian¹,

Singh²,

Kumar³

2012

International Agrophysics

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A b s t r a c t. Physical properties of coriander seeds were determined at moisture content of 3.5-17.7%, d.b. The major axis and 1 000 seeds mass were found to decrease nonlinearly with increase in seed moisture. The medium and minor axes, geometric mean diameter, sphericity, unit volume, surface area and angle of repose increased linearly. Bulk density decreased linearly, however the true density increased non-linearly. The coefficient of static friction increased nonlinearly for different surfaces with increase in moisture level and its maximum was found for plywood surface. The rupture force and energy absorbed decreased linearly with increasing moisture content.K e y w o r d s: coriander, seed, physical properties, moisture content INTRODUCTION Coriander (Coriandrum sativum L.) is an annual herb from the family Apiaceae and native to southern Europe and North Africa to southwestern Asia. The coriander seeds are almost ovate globular and there are many longitudinal ridges on the surface. Data concerning the physical and mechanical properties of agricultural food materials are of importance to plant breeders, engineers, machine manufactures, food scientists, processors and consumers. Those properties are useful in postharvest unit operations for the design of cleaning, grading, sorting, transportation, handling, aeration, sizing, storing, size reduction, packaging and other processing equipment (Sahay and Singh, 2001). Several investigators have reported the moisture dependence of physical and mechanical properties of chosen agricultural materials ie for black pepper (Murthy and Bhattacharya, 1998), fenugreek (Altuntas et al., 2005); fruit and kernel (Sahoo et al., 2009); rapeseed (Izli et al., 2009); bay laurel seeds (Yurtlu et al., 2010); lentil seed (Bagherpour et al., 2010). Chang (1988) determined the density and porosity of grain kernels using a gas pycnometer. Coskuner and Karababa (2007) determined some physical properties of coriander seeds at different moisture content and reported that the axial dimensions, sphericity, seed volume and surface area, true density, angle of repose, 1 000 seeds mass and coefficient of static friction increased with increase in moisture content except for bulk density.The present work was carried out to understand the physical and mechanical properties of coriander seeds at different moisture content. MATERIALS AND METHODSCoriander seed (RCR-4) was procured from the National Research Centre for Seed Spices, Ajmer (India). The seeds were cleaned manually and broken, and foreign matter, split, deformed and immature seeds were discarded before the samples were prepared for the experiment. The initial moisture content of seed was determined by vacuum oven method (Ranganna, 1986) at 80°C and pressure of 13.33 KPa. The seeds were stored at room temperature (25°C) for 2 to 3 weeks. Initial moisture content of coriander seed was found to be 7.0% d.b. For experimentation, a predetermined quantity of coriander was dried in a tray dryer at 55°C to achieve a desired low moisture c...

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Physical properties of coriander seeds at different moisture content

Balasubramanian¹,

Singh²,

Kumar³

2012

International Agrophysics

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“…Mechanical behaviour of the palm oil seeds (Elaeis guineensis L.) (Raji, Favier 2004) under compression loading is very similar to mechanical behaviour of jatropha seeds and similar to even distribution of strain fields (Owolarafe et al 2007). Deformation characteristics of hazelnut (Corylus avellana L.), macadamia nut (Macadamia integrifolia L.) (Braga et al 1999) or black pepper (Piper nigrum L.) (Murthy, Bhattacharya 1998) are also similar to jatropha deformation characteristic, only the middle part of the characteristics can be substituted by straight line dependence (Güner et al 2003). Deformation characteristics of apricot seeds (Prumus armeniaca L.) and faba bean seeds (Vicia faba L.) can be generally described by the higher degree polynomial function (Lysiak, Laskowski 2004;Vursavus, Ozguven 2004).…”

mentioning

confidence: 99%

Tangent curve utilization for description of mechanical behaviour of pressed mixture

Herák¹,

Kabutey²,

Sedláček³

et al. 2011

Res. Agric. Eng.

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Herák D., Kabutey A., Sedláček A., Gűrdil G., 2011. Tangent curve utilization for description of mechanical behaviour of pressed mixture. Res. Agr. Eng., This article is focused on the utilization of tangent curve for description of mechanical behaviour of pressed mixture under compression loading. The aim of this experiment was to determine the general equation describing deformation characteristics of pressed mixtures under compression loading and to verify this equation. The experiment was carried out using mixture of seeds of common sunflower (Heliantus annuus L.), jatropha ( Jatropha curcas L.), garden pea (Pisum sativum L.), common bean (Phaseolus vulgaris L.), and also mixture of spruce wood chips and waste paper chips. The results from the experiment showed that mechanical behaviour of the pressed mixtures under compression loading can be described by tangent curve function. From the determined coefficients of determination R 2 it was clear that fitted tangent curve functions described the measured amounts exactly for all pressed mixtures. It can be therefore assumed that this tangent curve function is appropriate for use in pressing any pressed mixtures during linear compression.

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