(Di Mattia et al. 2010). Despite of the ability of tannins to work on the air–water
interface, tannins can provide the faster release of active ingredients. The smallest
and the most hydrophilic protocatechuic acid exhibited the highest permeation rates,
followed by catechins and epigallocatechin gallate (Dal Belo et al. 2009).
Due to their antioxidant properties, polyphenols can improve the oxidative
stability and storage stability of emulsions (Di Mattia et al. 2010). In case of tannins
with anti-ageing property, the tannin should release from the formulation and work
on the dermis and epidermis of the skin (Zillich et al. 2015). Tannins from
Phyllanthus emblica can be used in formulation of cosmetics as it possess good skin
protection activity and the skin lightening lotion with 2% extract showed remarkable in-vivo activity by inhibiting the conversion of dihydroxy indole and dihydroxy indol carboxylic acid to melanin (Chaudhuri et al. 2007). Hydrophilic tannic
acid and lipophilic ellagic acid had been tasted for skin protection and it gave
anti-aging property by protecting dermal elastin from enzymatic degradation and its
deposition into fibroblast (Jimenez et al. 2006).
Different hydrolysable tannins and catechins obtained from chestnut can be used
as adhesives, cosmeceuticals, and food processors (Aires et al. 2016). Another
research study gave a knowledge about the collagen stabilization ability of vegetable tannin. It was found that pre-treated collagen fibres with acrylic polymer and
with tannin extract of Acacia mollissima exhibited an increase in hydrothermal
stability by 25 °C (Madhan et al. 2002).
21.12 Tannins in Neutraceuticals
Tannins can be found in some food bearings in an extensible amount and by taking
those in a definite amount can be beneficial for our health. Camellia sinensis (tea
plant) contain high tannin proportion (Ashok and Upadhyaya 2012) and the tannins
found in tea can provide health benefits beyond satisfying traditional nutritional
requirement. The tannins obtained from tea can be effective in conditions like
hypertension (Hara and Suzuki 1989), diabetes (Tong et al. 2014), and obese (Ra
2002). Chewing gum, containing tea polyphenols has been claimed to be effective
against influenza, and said to inhibit dissemination of the virus (Hara and
Nakayama 2001). High amounts of tannins (mainly condensed tannins and procyanidins) can be found in wines (more in red wines) and beers. Procyanidins was
shown to improve pathological oxidative state in a diabetic condition (Kumari and
Jain 2012) or asthma (Schmitz 2001). Pomegranate seed extract associated with
ellagitannins can be effective against atherosclerosis. De-caffeinated coffee extract
and chlorogenic acid supplement can make a person to lose weight. The stability of
flora in the intestine and the anti-fungal activity can be monitored with the help of
tannins or condensed tannins extract from acerin fruit, canaigre root or Swedish
birch bark (Sieniawska and Baj 2017).
21 Tannins and Polyphenols Extracted from Natural Plants …
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