provitamin

Essential oil content of provitamin concentrate from pine needles ( Pinus massoniana Lamb.) was about 15%.

松针维生素原浓缩物中的精油（90℃～130℃馏份）其量约为维生素原浓缩物的15%。

Main ingredients: fresh aloe juice extract, fresh milk, provitamin B 5, microelements, amino acid.

主要成份: 新鲜芦荟原汁精华 、 鲜牛奶 、 维他命原B5 、 微量元素 、 氨基酸等.

Ingredients: olive leaves extract, cereus essence, provitamin B 5, protease, moisturizing factor etc.

成份: 橄榄叶萃取精华 、 仙人掌精华素 、 维他命原B5 、 蛋白酶 、 保湿剂等.

Preparation and application of provitamin concentrate from pine needles

松针维生素原浓缩物的研制和应用

Questions have also been asked about the stability of the provitamin during storage and post-harvest processing, as well as its thermal stability during cooking.

也有人就维生素原在水稻的储存、收获后加工过程的稳定性，以及烹调过程中的热稳定性提出疑问。

Effects of laser irradiation time and concentration of 7-DHC on photochemistry of provitamin D_3

激光辐照时间及7-DHC浓度对维生素D3的光化学影响