Influence of variety and environment on the iodine value of cottonseed oil

Abstract

Summary Data are reported on the variation of the iodine value of the oil from the seed of eight varieties of cotton grown at 13 locations during three years. Analysis of variance showed the influence of variety and of station‐years to be highly significant statistically. Iodine value was found to be negatively correlated with the temperatures. The highest correlation was obtained for the period of maturation (35 days before the bolls open) when the oil is being synthesized. The coefficients for the relations with mean temperatures were higher than those for maximum and minimum temperatures. Simple correlations for the relations between iodine value of the oils from seed of individual varieties and mean temperatures during two periods of boll and seed development were negative and highly significant. For the maturation period (35 days before boll opening) and the combined periods for squaring, fiber elongation, and maturation (73 days before boll opening) the average reductions in iodine value per °F. increase in temperature were found to be 0.760 and 1.172 units, respectively. Of the eight varieties investigated, temperature influenced the iodine value of the oil least for Stoneville 2B and most for Coker Wilds.

Varying Planting Dates or Irrigation Regimes Alters Cottonseed Composition

“…Significant and practical compositional differences were most pronounced when irrigation was applied, where gossypol, oil, and carbohydrate levels were all increased and protein levels were reduced. The irrigation results were in line with associations reported for cottonseed between rainfall distribution and seed protein, oil, and gossypol levels (Pons et al, 1953; Stansbury et al, 1953, 1956). In addition, the increased linoleic acid and total unsaturated fatty acid concentrations observed in this work under irrigated conditions paralleled the observation by Stansbury et al (1953) that an increase in the oil's iodine value was associated with increased rainfall.…”

“…The irrigation results were in line with associations reported for cottonseed between rainfall distribution and seed protein, oil, and gossypol levels (Pons et al, 1953; Stansbury et al, 1953, 1956). In addition, the increased linoleic acid and total unsaturated fatty acid concentrations observed in this work under irrigated conditions paralleled the observation by Stansbury et al (1953) that an increase in the oil's iodine value was associated with increased rainfall. Planting date effects were relatively minor in comparison to the irrigation effects even though a number of statistically significant differences were detected.…”

“…The few existing studies that address the environment generally involve variety trials across multiple years or locations where the location or environment component of variation had been partitioned out (Turner et al, 1976; Cherry and Leffler, 1982; and Cherry et al, 1986, and references therein). Correlations have been noted for gossypol, protein, oil, and the oil's iodine value (an indication of unsaturated fatty acids) with precipitation and temperature patterns from data recorded across several locations and years (Pons et al, 1953; Stansbury et al, 1953, 1956). Data from recent variety trials hint at associations between cottonseed fatty acid composition and weather conditions (Dowd et al, 2010).…”

Durable flame-retardant finished cotton fabrics characterized by thermal degradation behaviors

“…The fabric used for this investigation was 100% cotton plain woven fabric (100 g/m 2 ) with a yarn count of 20 tex in warp and 16 tex in weft. Fabric count was 141/5 cm in ends and 135/5 cm in picks.…”

“…[1][2][3][4][5][6][7][8] But, as for studies on the thermal analysis of durable flame-retardant samples involving the activation energy of the thermal degradation reaction, little information has been available up to the present.…”