The nutritive value and quality index of cotton seed oil
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Cotton Cotton Seed
The Nutritive Value of Cotton Seed Oil
Cotton seed oil can be divided into 4 kinds; they are pressing cotton seed oil, solvent extraction cotton seed oil, genetically modified organism cotton seed oil and crude cotton seed oil.
There is 35%-45% oil, 39% protein, and 0.2%-2% gossypol in cotton nucleus. The refining cotton seed oil by removing gossypol is healthy and edible. It is orange-yellow or brown. There is a mass of unsaturated fatty acid in cotton seed oil, the fatty acid possess of 21.6%-24.8% palmitic acid, 1.9%-2.4% Stearic acid, 0-0.1% arachidic acid, 18.0%-30.7% Oleic acid, 44.9%-55.0% linoleic acid. The abundant linoleic acid can suppress cholesterol in blood rising effectively, safeguard people’s health. The digestibility of cotton seed oil for human is 98%.
The most important is having crude cotton seed oil will damage spermatogenic cells, lead to orchiatrophy, and infertility. For women, having crude cotton seed oil will lead to irregular menstruation, amenorrhea and metratrophia. Having crude cotton seed oil frequently, will lead to insolation, too. Symptom will be behaved after basking; people will feel weakness or hypohidrosis, skin broil and flushing, flustered and breathe hard, dizziness, numbness of limbs and anorexia.
Cotton oleic acid
Quality Index of Cotton Seed Oil
Crude Cotton Seed Oil Quality Index
Items | Quality Index |
Smell and taste | Possess inherent smell and taste of corn germ oil, no objectionable odor |
Moisture and volatile matter（%）≤ | 0.20 |
Insoluble impurity（%）≤ | 0.20 |
Acid value（mgKOH/g）≤ | 4.0 |
Peroxide value（mmol/kg）≤ | 7.5 |
Solvent residual amount（mg/kg）≤ | 100 |
Notice：The index of boldface is compulsive. | |
Cotton seed oil
Pressing Cotton Seed Oil and Solvent Extraction Cotton Seed Oil Quality Index
Items | Quality Index | |||
First Grade | Second Grade | Third Grade | ||
Color | （Lovibond cells 25.4mm）≤ | —— | —— | Yellow 35 Red 8.0 |
（Lovibond cells 133.4mm）≤ | Yellow 35 Red 3.5 | Yellow 35 Red 5.0 | —— | |
Smell and taste | Odor free, good taste | Smell and taste are both good | Possess inherent smell and taste of corn germ oil, no objectionable odor | |
Transparency | Clear, transparent | Clear, transparent | —— | |
Moisture and volatile matter（%）≤ | 0.05 | 0.05 | 0.20 | |
Insoluble impurity（%）≤ | 0.05 | 0.05 | 0.05 | |
Acid value（mgKOH/g）≤ | 0.20 | 0.30 | 1.0 | |
Peroxide value（mmol/kg）≤ | 5.0 | 5.0 | 6.0 | |
Heating test（280℃） | —— | —— | No precipitate, Lovibond cells: Yellow value is constant, the red value increases less than 0.4 | |
Saponified matter content（%）≤ | —— | —— | 0.03 | |
Smoking point（℃）≥ | 215 | 205 | —— | |
refrigeration test（store for 5h at 0℃） | Clear, transparent | —— | —— | |
Solvent residual amount（mg/kg）
| Solvent Extraction cotton seed oil | Can’t be detected | Can’t be detected | ≤50 |
Pressing cotton seed oil | Can’t be detected | Can’t be detected | Can’t be detected | |
Notice 1：Draw with “——”needn’t be detected. When the solvent residual amount of pressing oil, first grade oil and second grade oil is less than 10mg/kg, regard it as didn’t be detected. Notice 2：The index of boldface is compulsive. | ||||
